Net cage lifting control valve and design method thereof

Abstract

The invention discloses a net cage lifting control valve and a design method thereof, and relates to the technical field of valves, the net cage lifting control valve comprises a valve body, a valve core and a valve cover, the top of the valve body is detachably connected with the valve cover, a suspension cavity and a bottom cavity are sequentially arranged in the valve body, the section size of the suspension cavity is larger than that of the bottom cavity, and the valve core is movably connected in the suspension cavity; the valve element is in lap joint above the bottom cavity and is a hollow closed body, an overflowing hole is formed in the middle of the valve element, hollowed-out holes are formed in the valve cover, the upper surface of the valve element can cover all the hollowed-out holes, and a connecting pipe is arranged at the lower end of the valve body and used for being communicated with a net cage. The valve is an automatic control valve capable of achieving closing during upward floating and communicating during sinking, the valve is simple in structure and high in reliability, the stability of the net cage in the lifting process is ensured, manual intervention on the valve is not needed in the whole lifting process, the operation efficiency of a system is remarkably improved, and the safety risk of operators is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a cage lifting control valve and a design method thereof. Background Art

[0002] When aquaculture is carried out outside the bay and in deep waters, in order to cope with the risks brought by severe sea conditions, people usually use a lifting cage structure to ensure the safety of the cage structure and farmed fish. The lifting cage mainly achieves floating and sinking operations by means of air-filling and drainage, exhaust and water intake. When floating, an air compressor is used to inflate the variable suspension tank of the cage, and the seawater in the suspension tank is emptied by high-pressure air. When the gravity of the cage is less than the buoyancy, the cage gradually floats to the water surface. When sinking, the main method is natural sinking, that is, disconnecting the air compressor. As the gas in the variable suspension tank of the cage is gradually discharged, the air pressure drops, and seawater is injected from the inlet and outlet, the cage gradually sinks. However, due to the complexity of the sea conditions and the uneven force on the cage, it is easy for some gas on both sides of the variable suspension tank to fail to be discharged during the sinking process of the cage, and the cage is tilted or even overturned, and the sinking fails. Summary of the invention

[0003] The purpose of the present invention is to provide a cage lifting control valve and a design method thereof to solve the problems existing in the above-mentioned prior art, so that the valve can be automatically closed when floating and automatically connected when sinking, which is easy to control and install.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a net cage lifting control valve, comprising a valve body, a valve core and a valve cover, the top of the valve body is detachably connected to the valve cover, a suspension chamber and a bottom chamber are sequentially arranged in the valve body, the cross-sectional size of the suspension chamber is larger than the cross-sectional size of the bottom chamber, the suspension chamber is movably connected with the valve core, the valve core is overlapped on the top of the bottom chamber, the valve core is a hollow closed body, a flow hole is arranged in the middle of the valve core, hollow holes are arranged on the valve cover, the upper surface of the valve core can cover all the hollow holes, and a connecting pipe is arranged at the lower end of the valve body, and the connecting pipe is used to communicate with the net cage.

[0006] Preferably, the valve cover is connected to the upper port of the valve body through threads, and the connecting pipe is connected to the mesh box through threads; a filter is provided in the hollow hole.

[0007] Preferably, the cross section of the valve core is smaller than the cross section of the suspension chamber, the gap between the suspension chamber and the valve core is 1 mm-3 mm, and the valve core can slide in the suspension chamber.

[0008] Preferably, the gravity of the valve core is greater than the buoyancy of the valve core in water and less than the pressure of the high-pressure gas in the cage on the valve core.

[0009] Preferably, the height of the variable suspension chamber is 2-3 times the height of the valve core.

[0010] Preferably, the sum of the heights of the suspension chamber and the bottom chamber does not exceed 15 cm.

[0011] Preferably, the cross sections of the valve body, the valve cover and the valve core are all circular, the suspension chamber and the bottom chamber are in the shape of stepped grooves, and the valve body is provided with external threads.

[0012] Preferably, there are a plurality of hollow holes evenly distributed along the circumference of the valve cover.

[0013] Preferably, the upper surface and the lower surface of the valve core are both planes, and the cross-sectional size of the bottom cavity is larger than the size of the center hole of the valve core and smaller than the size of the lower surface of the valve core.

[0014] The present invention also provides a design method for a cage lifting control valve, which specifically includes the following steps:

[0015] S1, calculation formula to determine valve core weight:

[0016]

[0017] Among them, M spool M is the weight of the valve core in air, warspool is the weight of the valve core in water, D is the outer diameter of the valve core, d is the flow hole diameter of the valve core, l is the height of the valve core, t is the wall thickness of the valve core, ρ is the density of the valve core material, ρ w The water density of the water area for cage placement;

[0018] S2, establish the relationship formula between the valve structural parameters and the external environmental pressure and the gas pressure in the suspension chamber when the valve is closed;

[0019] S2-1, when the cage starts to inflate and float on the seabed, the high-pressure gas provided by the air compressor acts on the bottom of the valve core, and the valve core will float up to cover the hollow part of the upper part of the valve cover, and the valve body is in a closed state. At this time, the relationship between the weight of the valve core and the external environmental water pressure and the gas pressure in the suspension chamber is as follows:

[0020]

[0021] Among them, P AC It is the high pressure gas pressure that the compressor uses to inflate the cage when the cage floats up. In order to ensure that the gas can be injected into the variable buoyancy compartment of the cage and the seawater in the variable buoyancy compartment can be discharged, P AC ≥1.5P h; Ph is the water pressure on the upper part of the variable buoyancy tank when the cage sinks to the seabed, P h =ρ sea gh, h is the vertical distance between the upper part of the variable buoyancy tank and the sea surface when the cage sinks to the seabed, which is determined as the initial data according to the cage structure and the designed water depth of the cage, and g is the gravitational acceleration; D 2c is the inner diameter of the bottom cavity;

[0022] S2-2, when the cage floats to the water surface and starts operation, if the upper end of the suspension chamber is exposed to the air, the valve closure should also satisfy the following relationship:

[0023]

[0024] S3, establish the relationship formula between the valve structure parameters and the external environmental water pressure and the gas pressure in the suspension chamber when the valve is connected;

[0025] When the cage sinks, the air pipe is disconnected from the air compressor. As the high-pressure gas in the variable buoyancy chamber is discharged through the air pipe, the gas pressure in the variable buoyancy chamber decreases, the valve core falls, and the entire valve is in a connected state. The relationship between the weight of the valve core and the external environmental pressure and the gas pressure in the suspension chamber is as follows:

[0026]

[0027] Among them, P v is the gas pressure in the suspension chamber when the valve core falls, considering the influence of gas dynamic pressure, usually P v ≥0.1P AC ;P z P is the water pressure at the depth of the valve when the valve core is about to fall. z =ρ w gz, z is the design water depth when the valve core falls, z≤1m;

[0028] S4, determine the valve parameters by iterative calculation:

[0029] S4-1, determine the vertical distance h between the upper part of the variable buoyancy compartment of the cage and the sea surface when the cage sinks to the seabed and the water density ρ of the water area where the cage is laid w ;

[0030] S4-2, based on the weight of the valve core in air M spool , valve core weight in water M warspool , the diameter of the valve core flow hole d, the diameter of the bottom cavity D 2c is the initial value, and the iterative calculation of formulas (1)-(5) is performed to obtain the conditions that satisfy K0<1, K0'<1, K C >1 and the smaller K0 and K0' are, the better. CThe larger the valve structure parameters, the better; the valve structure parameters determined by the above calculation include the valve core outer diameter D, the valve core flow hole diameter d, the valve core height l, the valve core wall thickness t, the valve core material density ρ and the bottom cavity inner cavity diameter D 2c .

[0031] S4-3, based on the valve parameters determined in S4-2, determine other parameters based on structural safety and process feasibility to complete the valve design.

[0032] Compared with the prior art, the present invention has achieved the following technical effects:

[0033] The present invention is an automatic control valve that can be closed when floating and connected when sinking. The valve has a simple structure and high reliability, which ensures the stability of the cage lifting process. The entire lifting process does not require manual intervention of the valve, which significantly improves the operating efficiency of the system and greatly reduces the safety risks of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is a structural schematic diagram of a cage lifting control valve in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the internal structure of the cage lifting control valve in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the valve body in an embodiment of the present invention;

[0038] Figure 4 It is a structural schematic diagram of the valve core in an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the valve cover in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the cage lifting control valve when it is closed in the embodiment of the present invention;

[0041] Figure 7 It is a structural schematic diagram of the opening of the cage lifting control valve in an embodiment of the present invention;

[0042] In the figure: 1-valve body, 2-valve core, 3-valve cover, 4-connecting pipe, 5-hollow hole, 6-filter screen, 7-flow hole, 8-suspension chamber, 9-bottom chamber. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The purpose of the present invention is to provide a cage lifting control valve and a design method thereof to solve the problems existing in the prior art, so that the valve can be automatically closed when floating and automatically connected when sinking, which is convenient for control and installation.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Embodiment 1

[0047] like Figures 1 to 7 As shown, in this embodiment, a net cage lifting control valve is provided, including a valve body 1, a valve core 2 and a valve cover 3. The top of the valve body 1 is detachably connected to the valve cover 3, and a suspension chamber 8 and a bottom chamber 9 are sequentially arranged in the valve body 1. The cross-sectional size of the suspension chamber 8 is larger than the cross-sectional size of the bottom chamber 9. The suspension chamber 8 is movably connected with a valve core 2, and the valve core 2 is overlapped on the top of the bottom chamber 9. The valve core 2 is a hollow closed body, and a flow hole 7 is arranged in the middle of the valve core 2. The valve cover 3 is provided with hollow holes 5. The upper surface of the valve core 2 can cover all the hollow holes 5. The lower end of the valve body 1 is provided with a connecting pipe 4, and the connecting pipe 4 is used to communicate with the net cage.

[0048] As an optional solution, in this embodiment, the valve cover 3 is connected to the upper port of the valve body 1 through a thread. Preferably, the upper port of the valve body 1 is provided with an external thread, which can easily ensure that the inner wall of the suspension chamber 8 is smooth and flat. The connecting pipe 4 is connected to the mesh box through a thread; a filter screen 6 is provided in the hollow hole 5 to prevent impurities from entering.

[0049] As an optional solution, in this embodiment, the cross section of the valve core 2 is smaller than the cross section of the suspension chamber 8 , and the gap between the suspension chamber 8 and the valve core 2 is 1 mm-3 mm, so that the valve core 2 can slide in the suspension chamber 8 .

[0050] As an optional solution, in this embodiment, the gravity of the valve core 2 is greater than the buoyancy of the valve core 2 in water and less than the pressure of the high-pressure gas in the cage on the valve core 2.

[0051] As an optional solution, in this embodiment, the height of the suspension chamber 8 is 2-3 times the height of the valve core 2 .

[0052] As an optional solution, in this embodiment, the sum of the heights of the suspension chamber 8 and the bottom chamber 9 does not exceed 15 cm.

[0053] As an optional solution, in this embodiment, the cross-sections of the valve body 1, the valve cover 3 and the valve core 2 are all circular, the suspension chamber 8 and the bottom chamber 9 are in the shape of a stepped groove, and the valve body 1 and the connecting pipe 4 are both provided with external threads to ensure that the inner wall of the suspension chamber 8 is smooth. The diameter of the connecting pipe 4 is larger than the diameter of the flow hole of the valve core 2.

[0054] As an optional solution, in this embodiment, there are a plurality of hollow holes 5 evenly distributed along the circumference of the valve cover 3 .

[0055] As an optional solution, in this embodiment, the cross section of the cavity of the valve core 2 is rectangular.

[0056] Embodiment 2

[0057] This embodiment also provides a design method for a cage lifting control valve, which specifically includes the following steps:

[0058] S1, calculation formula to determine valve core weight:

[0059]

[0060] Among them, M spool M is the weight of the valve core in air, warspool is the weight of the valve core in water, D is the outer diameter of the valve core, d is the diameter of the flow hole 7 of the valve core, l is the height of the valve core, t is the wall thickness of the valve core, ρ is the density of the valve core material, ρ w The water density of the water area for cage placement;

[0061] S2, establish the relationship formula between the valve structural parameters and the external environmental pressure and the gas pressure in the suspension chamber when the valve is closed;

[0062] S2-1, when the cage starts to inflate and float on the seabed, the high-pressure gas provided by the air compressor acts on the bottom of the valve core, and the valve core will float up to cover the hollow part of the upper part of the valve cover, and the valve body is in a closed state. At this time, the relationship between the weight of the valve core and the external environmental water pressure and the gas pressure in the suspension chamber is as follows:

[0063]

[0064] Among them, P AC It is the high pressure gas pressure that the compressor uses to inflate the cage when the cage floats up. In order to ensure that the gas can be injected into the variable buoyancy compartment of the cage and the seawater in the variable buoyancy compartment can be discharged, P AC ≥1.5Ph;P h is the water pressure above the variable buoyancy compartment of the cage when the cage sinks to the seabed, P h =ρ seagh, h is the vertical distance between the upper part of the variable suspension tank and the sea surface when the cage sinks to the seabed, which is determined as the initial data according to the cage structure and the designed water depth of the cage, and g is the gravitational acceleration; D 2c is the inner diameter of the bottom cavity;

[0065] S2-2, when the cage floats to the water surface and starts operation, if the upper end of the suspension chamber is exposed to the air, the valve closure should also satisfy the following relationship:

[0066]

[0067] S3, establish the relationship formula between the valve structure parameters and the external environmental water pressure and the gas pressure in the suspension chamber when the valve is connected;

[0068] When the cage sinks, the air pipe is disconnected from the air compressor. As the high-pressure gas in the variable buoyancy chamber is discharged through the air pipe, the gas pressure in the variable buoyancy chamber decreases, the valve core falls, and the entire valve is in a connected state. The relationship between the weight of the valve core and the external environmental pressure and the gas pressure in the suspension chamber is as follows:

[0069]

[0070] Among them, P v is the gas pressure in the suspension chamber when the valve core falls, considering the influence of gas dynamic pressure, usually P v ≥0.1P AC ;P z P is the water pressure at the depth of the valve when the valve core is about to fall. z =ρ w gz, z is the design water depth when the valve core falls, z≤1m;

[0071] S4, determine the valve parameters by iterative calculation:

[0072] S4-1, determine the vertical distance h between the upper part of the variable buoyancy compartment of the cage and the sea surface when the cage sinks to the seabed and the water density ρ of the water area where the cage is laid w ;

[0073] S4-2, based on the weight of the valve core in air M spool , valve core weight in water M warspool , valve core weight in water = weight in air - valve core buoyancy in water, valve core flow hole 7 diameter d, bottom cavity inner cavity diameter D 2c is the initial value, and the iterative calculation of formulas (1)-(5) is performed to obtain the conditions that satisfy K0<1, K0'<1, K C >1 and the smaller K0 and K0' are, the better. CThe larger the valve structure parameters, the better; the valve structure parameters determined by the above calculation include the valve core outer diameter D, the valve core flow hole 7 diameter d, the valve core height l, the valve core wall thickness t, the valve core material density ρ and the bottom cavity inner cavity diameter D 2c .

[0074] S4-3, based on the valve parameters determined in S4-2, determine other parameters based on structural safety and process feasibility to complete the valve design.

[0075] Embodiment 3

[0076] In this embodiment, the valve is arranged on both sides or in the corners above the variable buoyancy compartment of the net box, and the internal thread adapter is welded at the corresponding position of the variable buoyancy compartment of the net box. When installing, the first cylinder of the valve is rotated and connected with the thread adapter to complete the valve installation; when checking, the valve cover is loosened in sequence to check the inside of the valve. The specific use principle is as follows:

[0077] (1) Figure 6 As shown, when the cage floats, in order to ensure that the gas can be injected into the variable buoyancy tank of the cage and the seawater in the tank is discharged, the air pressure (relative air pressure) of the high-pressure gas provided by the air compressor is more than 1.5 times the water pressure at the water depth of the cage. After the high-pressure gas enters the tank, it acts on the bottom of the valve core. At this time, if the weight of the valve core in water is less than the air pressure of the high-pressure gas * (cross-sectional area of ​​the bottom cavity inner cavity - hollow cross-sectional area of ​​the valve core) - water pressure at the water depth of the cage * upper surface area of ​​the valve core, the valve core will float up to support the valve cover, and the upper part of the valve cover will be hollowed out and covered, so that the valve body is in a closed state, and the high-pressure gas cannot be discharged through the valve. As the high-pressure gas in the variable buoyancy tank continues to enter, the seawater will continue to be discharged from the drain port at the bottom of the variable buoyancy tank of the cage, and the cage floats; at the same time, when the cage floats to the water surface and starts to operate, if the upper end of the buoyancy tank is exposed to the air, the weight of the valve core in the air is less than the air pressure of the high-pressure gas * (cross-sectional area of ​​the bottom cavity inner cavity - hollow cross-sectional area of ​​the valve core).

[0078] (2) Figure 7 As shown, when the cage sinks, the air pipe serving as the air inlet and outlet pipe is disconnected from the air compressor, and the free end is exposed to the atmosphere. Due to the pressure difference, the high-pressure gas in the variable buoyancy chamber is discharged through the air pipe, and the gas pressure in the chamber gradually drops to be equal to the atmospheric pressure. When the weight of the valve core in water > the air pressure in the variable buoyancy chamber * the end surface area of ​​the valve core - the hollow area of ​​the valve cover * the water pressure at the water depth where the cage sinks, the valve core falls, and the entire valve is in a connected state, the gas is discharged, and seawater enters, thereby ensuring that the gas at both ends of the variable buoyancy chamber is completely discharged and the cage sinks smoothly.

[0079] Based on the dynamic changes in the water pressure and air pressure of the variable buoyancy compartment of the cage and the external environment during the cage lifting process, this embodiment designs an automatic control valve that can be closed when floating and connected when sinking. The valve has a simple structure and high reliability, ensuring the smoothness of the cage lifting process. The entire lifting process does not require manual intervention in the valve, which significantly improves the operating efficiency and system, and greatly reduces the safety risks of operators. The valve adopts a detachable modular structure, which is easy to install and maintain. It can be flexibly arranged according to the structure and requirements of different cages, and has strong adaptability and versatility. The design of the valve takes into account the particularity of the marine environment, ensuring the stability and durability of the valve in a complex marine environment.

[0080] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A cage lifting control valve, characterized in that: It includes a valve body, a valve core and a valve cover. The top of the valve body is detachably connected to the valve cover. A suspension chamber and a bottom chamber are sequentially arranged in the valve body. The cross-sectional size of the suspension chamber is larger than that of the bottom chamber. The valve core is movably connected in the suspension chamber. The valve core is overlapped on the top of the bottom chamber. The valve core is a hollow closed body. A flow hole is arranged in the middle of the valve core. The valve cover is provided with hollow holes. The upper surface of the valve core can cover all the hollow holes. A connecting pipe is arranged at the lower end of the valve body. The connecting pipe is used to communicate with the mesh box.

2. The cage lifting control valve according to claim 1, characterized in that: The valve cover is connected to the upper port of the valve body through threads, and the connecting pipe is connected to the mesh box through threads; a filter is arranged in the hollow hole.

3. The cage lifting control valve according to claim 1, characterized in that: The cross section of the valve core is smaller than the cross section of the suspension chamber, the gap between the suspension chamber and the valve core is 1 mm-3 mm, and the valve core can slide in the suspension chamber.

4. The cage lifting control valve according to claim 1, characterized in that: The gravity of the valve core is greater than the buoyancy of the valve core in water and is less than the pressure of the high-pressure gas in the cage on the valve core.

5. The cage lifting control valve according to claim 1, characterized in that: The height of the suspension chamber is 2-3 times the height of the valve core.

6. The cage lifting control valve according to claim 1, characterized in that: The sum of the heights of the suspension chamber and the bottom chamber does not exceed 15 cm.

7. The cage lifting control valve according to claim 1, characterized in that: The cross sections of the valve body, the valve cover and the valve core are all circular, the suspension chamber and the bottom chamber are in the shape of stepped grooves, and the valve body is provided with external threads.

8. The cage lifting control valve according to claim 1, characterized in that: A plurality of hollow holes are evenly arranged around the valve cover.

9. The cage lifting control valve and design method thereof according to claim 1, characterized in that: The upper surface and the lower surface of the valve core are both planes, and the cross-sectional size of the bottom cavity is larger than the size of the center hole of the valve core and smaller than the size of the lower surface of the valve core.

10. A method for designing a cage lifting control valve as claimed in any one of claims 1 to 8, characterized in that: The specific steps include: S1, calculation formula to determine valve core weight: Among them, M spool M is the weight of the valve core in air, warspool is the weight of the valve core in water, D is the outer diameter of the valve core, d is the flow hole diameter of the valve core, l is the height of the valve core, t is the wall thickness of the valve core, ρ is the density of the valve core material, ρ w The water density of the water area for cage placement; S2, establish the relationship formula between the valve structural parameters and the external environmental pressure and the gas pressure in the suspension chamber when the valve is closed; S2-1, when the cage starts to inflate and float on the seabed, the high-pressure gas provided by the air compressor acts on the bottom of the valve core, and the valve core will float up to cover the hollow part of the upper part of the valve cover, and the valve body is in a closed state. At this time, the relationship between the weight of the valve core and the external environmental water pressure and the gas pressure in the suspension chamber is as follows: Among them, P AC It is the high pressure gas pressure that the compressor uses to inflate the cage when the cage floats up. In order to ensure that the gas can be injected into the variable suspension tank and the seawater in the variable suspension tank can be discharged, P AC ≥1.5Ph;P h is the water pressure above the variable suspension tank when the cage sinks to the seabed, P h =ρ sea gh, h is the vertical distance between the upper part of the variable suspension tank and the sea surface when the cage sinks to the seabed, which is determined as the initial data according to the cage structure and the designed water depth of the cage, and g is the gravitational acceleration; D 2c is the inner diameter of the bottom cavity; S2-2, when the cage floats to the water surface and starts operation, if the upper end of the suspension chamber is exposed to the air, the valve closure should also satisfy the following relationship: S3, establish the relationship formula between the valve structure parameters and the external environmental water pressure and the gas pressure in the suspension chamber when the valve is connected; When the cage sinks, the air pipe is disconnected from the air compressor. As the high-pressure gas in the variable suspension chamber is discharged through the air pipe, the gas pressure in the variable suspension chamber decreases, the valve core falls, and the entire valve is in a connected state. The relationship between the weight of the valve core and the external environmental pressure and the gas pressure in the suspension chamber is as follows: Among them, P v is the gas pressure in the suspension chamber when the valve core falls, considering the influence of gas dynamic pressure, usually P v ≥0.1P AC ;P z P is the water pressure at the depth of the valve when the valve core is about to fall. z =ρ w gz, z is the design water depth when the valve core falls, z≤1m; S4, determine the valve parameters by iterative calculation: S4-1, determine the vertical distance h between the upper part of the variable buoyancy compartment of the cage and the sea surface when the cage sinks to the seabed and the water density ρ of the water area where the cage is laid w ; S4-2, based on the weight of the valve core in air Mspool, the weight of the valve core in water Mwar spool, the diameter of the flow hole of the valve core d, and the diameter of the bottom cavity D 2c is the initial value, and the iterative calculation of formulas (1)-(5) satisfies K0<1, K0'<1, K C >1 and the smaller K0 and K0' are, the better. C The larger the valve structure parameters, the better; the valve structure parameters determined by the above calculation include the valve core outer diameter D, the valve core flow hole diameter d, the valve core height l, the valve core wall thickness t, the valve core material density ρ and the bottom cavity inner cavity diameter D 2c . S4-3, based on the valve parameters determined in S4-2, determine other parameters based on structural safety and process feasibility to complete the valve design.

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