Method for optimizing structure parameters of reed nozzle shutter permanent magnet type electrical conversion module

Abstract

The application discloses a structure parameter optimization method of a reed nozzle baffle permanent magnet type electrical conversion module, wherein an optimization target of an electromagnetic coil current is initially set, a magnetic line distribution diagram and a magnetic induction intensity distribution diagram of the reed nozzle baffle permanent magnet type electrical conversion module are obtained through finite element simulation analysis, and finally the electromagnetic coil current is close to the optimization target by repeatedly modifying the elastic coefficient of a spring, the installation position of a permanent magnet and the structure parameter of a shell.

Description

Technical Field

[0001] This invention relates to the field of industrial flow control, and in particular to a method for optimizing the structural parameters of a reed-type nozzle baffle permanent magnet electrical conversion module. Background Technology

[0002] Valve positioners, classified by structure into pneumatic valve positioners, electro-pneumatic valve positioners, and intelligent valve positioners, are the main accessories of control valves. They are usually used in conjunction with pneumatic control valves. They receive the output signal from the controller and then use their output signal to control the pneumatic control valve. After the control valve is activated, the displacement of the valve stem is fed back to the valve positioner through a mechanical device, and the valve position status is transmitted to the upper system through an electrical signal.

[0003] The key component of a valve positioner is the electrical conversion module, whose main function is to convert electrical signals into pneumatic signals. By amplifying the back pressure of the nozzle and controlling the flow, it provides sufficient power to operate the pneumatic control valve. The accuracy, real-time performance, reliability, vibration resistance, and low power consumption of the electrical conversion module directly affect the overall performance of the valve positioner. Designing a superior electrical conversion module is crucial for achieving intelligent valve positioners.

[0004] For applications in flammable and explosive environments such as oil and gas transportation, the power consumption of electrical conversion modules is crucial; lower power consumption and lower operating current result in a higher safety factor. Developing electrical conversion modules with lower energy consumption and higher safety has always been a necessity in the industrial flow control field. Meanwhile, sensitivity and pressure tolerance range are also important performance indicators; the higher the better.

[0005] There are two main technical approaches to reducing operating current: one is to reduce leakage flux of the electromagnetic coil through excellent structural design, and the other is to reduce the required force of the electromagnetic coil by adding permanent magnets. Furthermore, the overall structure of the electrical conversion module needs to be optimized to reduce unnecessary losses. However, many structural parameters affect power consumption, and these parameters are coupled together, making it impossible to analyze them individually, which greatly complicates the optimization process. Summary of the Invention

[0006] To address the aforementioned problems in existing technologies, this invention provides a method for optimizing the structural parameters of a reed-type nozzle baffle permanent magnet electrical conversion module. First, an initial optimization target for the electromagnetic coil current is set. Then, finite element simulation analysis is used to obtain the magnetic field distribution map and magnetic induction intensity distribution map of the reed-type nozzle baffle permanent magnet electrical conversion module. Finally, by repeatedly modifying the spring constant, the permanent magnet mounting position, and the structural parameters of the outer shell, the electromagnetic coil current is brought closer to the optimization target, ultimately achieving excellent technical results with lower operating current, higher sensitivity, and greater resistance to gas pressure.

[0007] The technical solution of the present invention is as follows:

[0008] A method for optimizing the structural parameters of a reed-type nozzle baffle permanent magnet type electrical conversion module, the method being based on a reed-type nozzle baffle permanent magnet type electrical conversion module; the reed-type nozzle baffle permanent magnet type electrical conversion module includes a housing 1, an electromagnetic coil 2, a nozzle 3, a spring 4, a baffle 5, an upper cover 6, and a permanent magnet 7;

[0009] The housing 1 can be regarded as formed by a thin-walled metal shell with a "凵"-shaped cross-section rotating around a central axis. The position of the central axis meets the following conditions:

[0010] 1-1. perpendicular to the bottom edge of the thin-walled metal shell, that is, the horizontal side of the "凵" character;

[0011] 1-2. not coincident with the thin-walled metal shell;

[0012] The housing 1 obtained according to the above rotation operation is a structure composed of two inner and outer cylindrical hollow cylinders, and these two hollow cylinders are respectively defined as a magnetic core 8 and an outer wall 9; the lower parts of the magnetic core 8 and the outer wall 9 are connected by a circular plate with a through hole in the center, so that the bottom of the housing 1 is closed and the upper part is open; the inner diameter of the outer wall 9 is defined as the outer wall inner diameter, and the outer diameter of the outer wall is defined as the outer wall outer diameter;

[0013] The electromagnetic coil 2 is arranged inside the housing 1, and the magnetic core 8 is exactly embedded in the center of the electromagnetic coil 2, and the central axis of the electromagnetic coil 2 coincides with that of the magnetic core 8;

[0014] The nozzle 3 is fixed on the upper part of the magnetic core 8, and gas can flow into the inside of the magnetic core 8 from the bottom of the housing 1 and then flow out from the nozzle 3; the inner diameter of the magnetic core 8 is defined as the magnetic core inner diameter, and the outer diameter of the magnetic core 8 is defined as the magnetic core outer diameter;

[0015] The baffle 5 is a circular thin plate, arranged above the nozzle 3, and connected to the outer wall 9 through a spring 4; the distance between the baffle 5 and the nozzle 3 is defined as the baffle air gap;

[0016] The upper cover 6 is connected to the outer wall 9 through fasteners, and together with the housing 1 forms a complete closed cylindrical structure, so that the electromagnetic coil 2, the nozzle 3, the spring 4, and the baffle 5 are all sealed inside the cylinder; there is a gap between the upper cover 6 and the outer wall 9, and this gap is defined as the housing air gap; the gas flowing out from the nozzle 3 can flow out to the outside through the housing air gap;

[0017] The upper cover 6 has a through hole in the center, which is defined as the permanent magnet mounting hole; there is a distance between the lower end face of the permanent magnet mounting hole and the upper end face of the magnetic core 8, which is defined as the baffle adjustment range; the permanent magnet 7 is set inside the permanent magnet mounting hole and is positioned exactly above the baffle 5; there is a distance between the lower end face of the permanent magnet 7 and the upper end face of the magnetic core 8, which is defined as the permanent magnet mounting distance;

[0018] Under the combined action of the magnetic force of the permanent magnet 7, the elastic force of the spring 4, the pressure of the gas, and the electromagnetic force of the electromagnetic coil 2, the baffle 5 moves up and down above the nozzle 3 within the baffle adjustment range; after changing the current of the electromagnetic coil 2, the position of the baffle 5 will change accordingly.

[0019] The steps of the method are as follows:

[0020] S1. Select the structural parameters of the reed-type nozzle baffle permanent magnet electrical conversion module: number of turns, inner diameter, outer diameter and height of electromagnetic coil 2; inner diameter, outer diameter and height of magnetic core 8; inner diameter, outer diameter and height of outer wall 9; baffle air gap; housing air gap; baffle adjustment range; permanent magnet installation distance; thickness of top cover 6; spring coefficient of spring 4;

[0021] S2. Determine the inner diameter of the magnetic core 8 based on the given maximum values ​​of gas pressure and flow rate;

[0022] S3. Select the number of turns N of electromagnetic coil 2 based on experience. o Based on this, the inner diameter, outer diameter, and height of electromagnetic coil 2 are determined;

[0023] S4. Determine the outer diameter and height of the magnetic core 8, and the inner diameter, outer diameter and height of the outer wall 9 based on the inner diameter, outer diameter and height of the electromagnetic coil 2.

[0024] S5. Determine the baffle adjustment range and the housing air gap based on the given maximum values ​​of gas pressure and flow rate;

[0025] S6. Determine the thickness of the upper cover 6 based on the structural parameters of the magnetic core 8 and the outer wall 9, the baffle adjustment range, and the air gap of the shell, and design the mechanical structure of the upper cover 6.

[0026] S7. Based on experience, select the elastic coefficient as K. o Spring 4;

[0027] S8. Select the current I of electromagnetic coil 2 based on experience. o Then, a three-dimensional model of the reed nozzle baffle permanent magnet electrical conversion module was created, and finite element simulation analysis was performed to obtain the magnetic field distribution map and magnetic induction intensity distribution map of the reed nozzle baffle permanent magnet electrical conversion module.

[0028] S9. Check if the magnetic induction intensity inside the baffle 5 has reached saturation. If so, repeatedly modify the following structural parameters and execute S8 until the magnetic induction intensity inside the baffle 5 is not saturated: inner diameter, outer diameter and height of the magnetic core 8; inner diameter, outer diameter and height of the outer wall 9; thickness of the top cover 6; air gap of the baffle; baffle adjustment range; permanent magnet installation distance.

[0029] S10. Repeatedly modify the structural parameters of S9 and execute S8 until the magnetic induction intensity inside the baffle 5 reaches its maximum value; record the installation distance of the permanent magnet at this point as P. o ;

[0030] S11. Based on the structural parameters determined in S10, fabricate a physical prototype of the reed-type nozzle baffle permanent magnet electrical conversion module. With the electromagnetic coil 2 de-energized and the gas pressure and flow rate at their minimum values, adjust the permanent magnet installation distance so that the baffle 5 moves to its maximum adjustment range. Record this permanent magnet installation distance as P. m ;

[0031] S12, Compare P m and P o Then select a new spring 4, so that P m With P o The difference does not exceed P o ±5%; let the spring constant of spring 4 at this time be denoted as K. m ;

[0032] S13. Energize electromagnetic coil 2 and adjust the gas pressure and flow rate to their maximum values. Then adjust the current of electromagnetic coil 2 so that baffle 5 moves to the minimum value of the baffle adjustment range. Record the current at this time as I. m ;

[0033] S14, Comparison I o with I m Adjust the number of turns of electromagnetic coil 2 according to the following formula:

[0034]

[0035] S15. Set the number of turns of electromagnetic coil 2 in S8 to N. m Then repeat steps S8 through S13 until I. m with I o The difference does not exceed I o ±5%;

[0036] S16, Decrease I in S8 o Then repeat steps S8 through S15 until I... m It meets the design requirements.

[0037] The beneficial technical effects of this invention are as follows:

[0038] (1) The working current of the electromagnetic coil is 0 - 1.8 mA, with lower power consumption;

[0039] (2) When the increment of the electromagnetic coil current reaches 0.005 mA, the flow rate and pressure of the gas will change, improving the sensitivity;

[0040] (3) The pressure range of the gas is 0 - 7 bar, and it can withstand greater pressure. Description of the Drawings

[0041] Figure 1 is the flow chart of the present invention;

[0042] Figure 2 is the exploded view of the reed - type nozzle - flapper permanent - magnet type electrical conversion module;

[0043] Figure 3 is the external view of the reed - type nozzle - flapper permanent - magnet type electrical conversion module;

[0044] Figure 4 is the magnetic - force line simulation diagram when the electromagnetic coil is energized;

[0045] Figure 5 is the distribution diagram of the magnetic induction intensity when the electromagnetic coil is energized.

[0046] In the figures, the corresponding relationship between the component names and the drawing reference numbers is as follows: 1. Housing; 2. Electromagnetic coil; 3. Nozzle; 4. Spring; 5. Flapper; 6. Upper cover; 7. Permanent magnet; 8. Magnetic core; 9. Outer wall; 10. Housing fixing hole; 11. Upper - cover fixing hole; 12. Fixing screw; 13. Circuit board; 14. Adjusting screw; 15. Fixing nut. Detailed Embodiments

[0047] The present invention will be specifically described below with reference to the drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0048] The flow chart of the embodiment is as Figure 1 shown, and is used to optimize the structural parameters of the reed - type nozzle - flapper permanent - magnet type electrical conversion module. The mechanical structure of the reed - type nozzle - flapper permanent - magnet type electrical conversion module is as Figure 2 shown, and is composed of a housing 1, an electromagnetic coil 2, a nozzle 3, a spring 4, a flapper 5, an upper cover 6, and a permanent magnet 7.

[0049] The housing 1 can be regarded as formed by rotating a thin - walled metal shell with a "凵" - shaped cross - section around a central axis for one week, and the position of the central axis meets the following conditions:

[0050] (1) perpendicular to the bottom edge of the thin-walled metal shell, that is, the horizontal edge of the "凵" character;

[0051] (2) not coincident with the thin-walled metal shell.

[0052] The housing 1 obtained according to the above rotation operation is a structure composed of two inner and outer cylindrical hollow cylinders. These two hollow cylinders are respectively defined as the magnetic core 8 and the outer wall 9. The lower parts of the magnetic core 8 and the outer wall 9 are connected by a circular plate with a through hole in the center, so that the bottom of the housing 1 is closed and the upper part is open. The diameter inside the outer wall 9 is defined as the outer wall inner diameter, and the diameter outside the outer wall 9 is defined as the outer wall outer diameter. Three housing fixing holes 10 are provided on the upper part of the outer wall 9 for fixedly connecting the spring 4 and the upper cover 6.

[0053] The electromagnetic coil 2 is arranged inside the housing 1, and the magnetic core 8 is exactly embedded in the center of the electromagnetic coil 2, and their central axes coincide. The circuit board 13 is arranged between the electromagnetic coil 2 and the bottom of the housing 1 for adjusting the current of the electromagnetic coil 2.

[0054] The nozzle 3 is fixed on the upper part of the magnetic core 8. Gas can flow into the inside of the magnetic core 8 from the bottom of the housing 1 and then flow out from the nozzle 3. The diameter inside the magnetic core 8 is defined as the magnetic core inner diameter, and the diameter outside the magnetic core 8 is defined as the magnetic core outer diameter.

[0055] The baffle plate 5 is a circular thin plate arranged above the nozzle 3; the distance between the baffle plate 5 and the nozzle 3 is defined as the baffle air gap. The baffle plate 5 is fixed on the spring 4; there are three holes on the spring 4, which correspond to the housing fixing holes 10 on the outer wall 9 one by one for the fixed connection between the spring 4 and the outer wall 9.

[0056] Three upper cover fixing holes 11 are provided on the upper cover 6, which correspond to the housing fixing holes 10 on the outer wall 9 one by one. The upper cover 6 and the outer wall 9 can be connected by fixing screws 12, so that the upper cover 6 and the housing 1 form a complete closed cylindrical structure ( Figure 2 ), and the electromagnetic coil 2, the nozzle 3, the spring 4, and the baffle plate 5 are all sealed inside the cylinder. There is a gap between the upper cover 6 and the outer wall 9, and this gap is defined as the housing air gap. The gas flowing out from the nozzle 3 can flow out to the outside through the housing air gap.

[0057] A through hole is provided in the center of the upper cover 6, defined as the permanent magnet mounting hole. There is a distance between the lower end face of the permanent magnet mounting hole and the upper end face of the magnetic core 8; this distance is defined as the baffle adjustment range. The permanent magnet 7 is mounted inside the permanent magnet mounting hole via adjusting screw 14 and fixing nut 15, and its position is exactly above the baffle 5. There is a distance between the lower end face of the permanent magnet 7 and the upper end face of the magnetic core 8; this distance is defined as the permanent magnet mounting position. The permanent magnet mounting position can be adjusted by rotating adjusting screw 14.

[0058] The shell 1, baffle 5 and top cover 6 are all made of soft magnetic material. When the electromagnetic coil 2 is energized, all three will be magnetized.

[0059] Under the combined action of the magnetic force of the permanent magnet 7, the elastic force of the spring 4, the gas pressure, and the electromagnetic force of the electromagnetic coil 2, the baffle 5 moves up and down above the nozzle 3 within the baffle adjustment range; after changing the current of the electromagnetic coil 2, the position of the baffle 5 will change accordingly, thereby adjusting the gas pressure and flow rate at the outlet of the nozzle 3.

[0060] The appearance after assembly of the embodiment is as follows Figure 3 As shown. This embodiment can achieve better performance than similar products:

[0061] (1) Lower power consumption, the working current of electromagnetic coil 2 is 0~1.8mA;

[0062] (2) It has higher sensitivity. When the current of the electromagnetic coil 2 reaches 0.005mA, the baffle 5 can be activated.

[0063] (3) It can withstand greater pressure, with the gas pressure range being 0 to 7 bar.

[0064] The above-mentioned performance is achieved in the embodiments for three main reasons:

[0065] 1. The outer casing is designed with a magnetically conductive structure to reduce the diffusion of magnetic field lines. The casing 1, baffle 5, and top cover 6 are all made of soft magnetic material. The magnetic field generated by the electromagnetic coil 2 will magnetize the three components, thereby enhancing the electromagnetic force of the electromagnetic coil 2. The same performance as similar products can be obtained with a smaller current. Figure 4 This is a diagram showing the magnetic field lines distribution when electromagnetic coil 2 is energized. Figure 5 This is the corresponding magnetic field strength distribution diagram. From Figure 4 , 5 As can be seen, almost all the magnetic field lines are concentrated inside the shell 1, baffle 5, and top cover 6, with only a small portion diffusing to the outside. This is equivalent to the magnetic field lines of the electromagnetic coil 2 being concentrated and acting on the baffle. Such a structure is obviously more energy-efficient than similar products with open structures.

[0066] 2. A permanent magnet is used to reduce the electromagnetic force required by the electromagnetic coil 2. An example is a normally open valve. The position with the maximum valve opening is defined as P_Max, the position with the minimum opening (i.e., the position where the baffle contacts the nozzle 3) is defined as P_Mim, and the middle position between P_Max and P_Mim is defined as P_Middle.

[0067] If permanent magnet 7 is not installed, then the initial position of baffle 5 must be set at P_Max, and then the baffle is attracted to P_Mim by increasing the electromagnetic force F1 of electromagnetic coil 2. Assuming the distance the baffle travels from P_Max to P_Mim is H, then the electromagnetic force F1 is directly proportional to H:

[0068] F1=k1H

[0069] Where k1 is the spring constant of spring 4. This is because F1 only needs to be balanced with the spring force of spring 4.

[0070] After setting the permanent magnet 7, the initial position of the baffle 5 can be set at P_Middle, and then it can be attracted to P_Max by the permanent magnet 7.

[0071] To analyze the electromagnetic force exerted by the permanent magnet 7 on the baffle 5, an electromagnetic coil is used to equivalently replace the permanent magnet 7. Neglecting the magnetic reluctance of the iron core, the relationship between the magnetic induction intensity B of the electromagnetic coil and the air gap is:

[0072]

[0073] Where N represents the number of coils, I represents the current intensity, μ0 represents the free permeability, and l represents the air gap height. The formula for calculating electromagnetic force is:

[0074]

[0075] Where S0 represents the cross-sectional area of ​​the air gap. Based on formulas (1) and (2), it can be deduced that the electromagnetic force F2 exerted by the permanent magnet 7 on the baffle 5 is inversely proportional to the square of the distance d between them (equivalent to the air gap height):

[0076]

[0077] When the baffle is at P_Max, the electromagnetic force F3 of the electromagnetic coil 2 is 0, and the electromagnetic force F2 of the permanent magnet 7 on the baffle 5 is balanced with the spring force, with the following relationship:

[0078]

[0079] When the electromagnetic force F3 of electromagnetic coil 2 attracts baffle 5 to P_Mim, the electromagnetic force F3 of electromagnetic coil 2 is equal to the resultant force of F2 and the spring force, and the following relationship exists:

[0080]

[0081] It is easy to see that F2 is less than 1 at this time. Because as d increases, the rate at which F2 decreases is greater than... Quickly. Therefore:

[0082]

[0083] Therefore, it can be seen that after setting the permanent magnet 7, the current required by the electromagnetic coil 2 to pull the baffle 5 from P_Max to P_Mim has decreased.

[0084] It is also easy to see that: under the same gas pressure and flow rate, the electromagnetic coil current required to drive the baffle 5 to make the same displacement is smaller, that is, the sensitivity is higher; under the same electromagnetic coil current and the same position of the baffle 5, the gas pressure and flow rate flowing out of the nozzle 3 are both increased.

[0085] III. Optimize structural parameters. Many structural parameters affect the adjustment effect; if they are not set properly, optimal performance cannot be achieved. The steps for optimizing structural parameters are as follows: Figure 1 As shown:

[0086] S1. Select the structural parameters of the reed-type nozzle baffle permanent magnet electrical conversion module:

[0087] (1) The number of turns, inner diameter, outer diameter and height of electromagnetic coil 2;

[0088] (2) Inner diameter, outer diameter and height of magnetic core 8;

[0089] (3) The inner diameter, outer diameter, and height of the outer wall 9;

[0090] (4) Baffle air gap;

[0091] (5) Air gap in the shell;

[0092] (6) Baffle adjustment range;

[0093] (7) Permanent magnet installation distance;

[0094] (8) The thickness of the top cover 6;

[0095] (9) The spring constant of spring 4;

[0096] S2. Determine the inner diameter of the magnetic core 8 based on the maximum values ​​of the given gas pressure and flow rate. The range of the inner diameter of the magnetic core 8 is 1.0 to 2.0 mm.

[0097] S3. Select the number of turns N of electromagnetic coil 2 based on experience. oThe value ranges from 9500 to 9800 turns. The inner diameter, outer diameter, and height of electromagnetic coil 2 are determined based on the selected number of turns.

[0098] S4. Determine the outer diameter and height of the magnetic core 8, and the inner diameter, outer diameter, and height of the outer wall 9 based on the inner diameter, outer diameter, and height of the electromagnetic coil 2. The value ranges of these structural parameters are as follows:

[0099] (1) Inner diameter of magnetic core 8: 1.0~2.0mm;

[0100] (2) Outer diameter of magnetic core 8: 4.5~6.0mm;

[0101] (3) Height of magnetic core 8: 17.0~20.0mm;

[0102] (4) Inner diameter of outer wall 9: 26.0~27.0mm;

[0103] (5) Outer diameter of outer wall 9: 28.0~30.0mm;

[0104] (6) Height of outer wall 9: 17.0~20.0mm.

[0105] S5. Based on the given maximum values ​​of gas pressure and flow rate, determine the baffle adjustment range and the air gap of the casing. The value ranges of these structural parameters are as follows:

[0106] (1) Baffle adjustment range: 0.6~1.0mm;

[0107] (2) Air gap in the shell: 0.2~0.5mm.

[0108] S6. Determine the thickness of the upper cover 6 based on the structural parameters of the magnetic core 8 and the outer wall 9, the baffle adjustment range, and the air gap of the shell, and design the mechanical structure of the upper cover 6. The thickness of the upper cover 6 is in the range of 3.0 to 5.0 mm.

[0109] S7. Based on experience, select the elastic coefficient as K. o Spring 4.

[0110] S8. Select the current I of electromagnetic coil 2 based on experience. o Then, a 3D model of the reed nozzle baffle permanent magnet electrical conversion module was created, and finite element simulation analysis was performed to obtain the magnetic field distribution diagram of the reed nozzle baffle permanent magnet electrical conversion module. Figure 4 ) and magnetic induction intensity distribution map ( Figure 5 ).

[0111] S9. Check if the magnetic induction intensity inside the baffle 5 has reached saturation. If so, repeatedly modify the following structural parameters and execute S8 until the magnetic induction intensity inside the baffle 5 is not saturated: inner diameter, outer diameter, and height of the magnetic core 8; inner diameter, outer diameter, and height of the outer wall 9; thickness of the upper cover 6; air gap of the baffle; baffle adjustment range; permanent magnet installation distance. The value range of the permanent magnet installation distance is 1.0~1.5mm.

[0112] S10. Repeatedly modify the structural parameters of S9 and execute S8 until the magnetic induction intensity inside the baffle 5 reaches its maximum value. Record the installation distance of the permanent magnet at this point as P. o .

[0113] S11. Based on the structural parameters determined in S10, fabricate a physical prototype of the reed-type nozzle baffle permanent magnet electrical conversion module. With the electromagnetic coil 2 de-energized and the gas pressure and flow rate at their minimum values, adjust the permanent magnet installation distance so that the baffle 5 moves to its maximum adjustment range. Record this permanent magnet installation distance as P. m .

[0114] S12, Compare P m and P o Then select a new spring 4, so that P m With P o The difference does not exceed P o ±5%. Let K be the spring constant of spring 4 at this point. m .

[0115] S13. Energize electromagnetic coil 2 and adjust the gas pressure and flow rate to their maximum values. Then, adjust the current of electromagnetic coil 2 so that baffle 5 moves to its minimum adjustment range. Record the current at this point as I. m .

[0116] S14, Comparison I o with I m Adjust the number of turns of electromagnetic coil 2 according to the following formula:

[0117]

[0118] S15. Set the number of turns of electromagnetic coil 2 in S8 to N. m Then repeat steps S8 through S13 until I. m with I o The difference does not exceed I o ±5%.

[0119] S16, Decrease I in S8 o Then repeat steps S8 through S15 until I... m It meets the design requirements.

[0120] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, and for those of ordinary skill in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. Therefore, the present invention is not limited to the specific details without departing from the general concept defined by the claims and their equivalents.

Claims

1. A method for optimizing the structural parameters of a reed nozzle shutter permanent magnet type electrical conversion module, characterized in that: The method is based on a reed nozzle shutter permanent magnet type electrical conversion module; the reed nozzle shutter permanent magnet type electrical conversion module comprises a shell (1), an electromagnetic coil (2), a nozzle (3), a spring (4), a shutter (5), an upper cover (6) and a permanent magnet (7); the materials of the shell (1), the shutter (5) and the upper cover (6) are soft magnetic materials; The shell (1) can be regarded as a thin-walled metal shell with a "N" cross-sectional view rotating one turn around a central axis, and the position of the central axis meets the following conditions: 1-1, perpendicular to the bottom edge of the thin-walled metal shell, i.e. the horizontal edge of the "N" character; 1-2, not coinciding with the thin-walled metal shell; The shell (1) obtained according to the above rotating operation is a structure composed of two hollow cylindrical cylinders, which are defined as magnetic core (8) and outer wall (9) respectively; the lower part of the magnetic core (8) and the outer wall (9) is connected by a circular plate with a through hole in the center, so that the bottom of the shell (1) is closed and the upper part is open; the diameter inside the outer wall (9) is defined as the outer wall inner diameter, and the diameter outside the outer wall is defined as the outer wall outer diameter; The electromagnetic coil (2) is arranged inside the shell (1), and the magnetic core (8) is embedded in the center of the electromagnetic coil (2), and the electromagnetic coil (2) is coincident with the central axis of the magnetic core (8); The nozzle (3) is fixed at the upper part of the magnetic core (8), and the gas can flow into the inside of the magnetic core (8) from the bottom of the shell (1), and then flow out from the nozzle (3); the diameter inside the magnetic core (8) is defined as the magnetic core inner diameter, and the diameter outside the magnetic core (8) is defined as the magnetic core outer diameter; The shutter (5) is a circular thin plate, which is arranged above the nozzle (3) and connected with the outer wall (9) through the spring (4); the distance between the shutter (5) and the nozzle (3) is defined as the shutter air gap; The upper cover (6) is connected with the outer wall (9) through fasteners, and together with the shell (1) forms a complete closed cylindrical structure, so that the electromagnetic coil (2), the nozzle (3), the spring (4) and the shutter (5) are sealed inside the cylinder; there is a gap between the upper cover (6) and the outer wall (9), which is defined as the shell air gap; the gas flowing out of the nozzle (3) can flow out to the outside from the shell air gap; A through hole is provided in the center of the upper cover (6), which is defined as the permanent magnet mounting hole; there is a distance between the lower end surface of the permanent magnet mounting hole and the upper end surface of the magnetic core (8), which is defined as the shutter adjustment range; the permanent magnet (7) is arranged inside the permanent magnet mounting hole, and the position is just above the shutter (5); there is a distance between the lower end surface of the permanent magnet (7) and the upper end surface of the magnetic core (8), which is defined as the permanent magnet mounting distance; The baffle (5) moves up and down above the nozzle (3) within the baffle adjustment range under the joint action of the magnetic force of the permanent magnet (7), the elastic force of the spring (4), the pressure of the gas and the electromagnetic force of the electromagnetic coil (2); after the current of the electromagnetic coil (2) is changed, the position of the baffle (5) will change accordingly; The steps of the method are as follows: S1, select the structure parameters of the reed nozzle baffle permanent magnet type electrical conversion module: the number of turns, the inner diameter, the outer diameter and the height of the electromagnetic coil (2); the inner diameter, the outer diameter and the height of the magnetic core (8); the inner diameter, the outer diameter and the height of the outer wall (9); the baffle air gap; the shell air gap; the baffle adjustment range; the permanent magnet installation distance; the thickness of the upper cover (6); the elastic coefficient of the spring (4); S2, according to the given maximum value of the gas pressure and flow, determine the inner diameter of the magnetic core (8); S3. Selecting the number of turns N of the electromagnetic coil (2) empirically o and determining the inner diameter, the outer diameter and the height of the electromagnetic coil (2) accordingly; S4, according to the inner diameter, the outer diameter and the height of the electromagnetic coil (2), determine the outer diameter and the height of the magnetic core (8), the inner diameter, the outer diameter and the height of the outer wall (9); S5, according to the given maximum value of the gas pressure and flow, determine the baffle adjustment range and the shell air gap; S6, according to the structure parameters of the magnetic core (8) and the outer wall (9), the baffle adjustment range, the shell air gap, determine the thickness of the upper cover (6), and design the mechanical structure of the upper cover (6); S7, the elastic coefficient is K o of the spring (4); S8. Selecting the current I of the electromagnetic coil (2) empirically o Then, the spring nozzle baffle permanent magnet type electrical conversion module is modeled in three dimensions, and finite element simulation analysis is performed to obtain the magnetic field distribution diagram and the magnetic induction intensity distribution diagram of the spring nozzle baffle permanent magnet type electrical conversion module. S9, check whether the magnetic induction intensity inside the baffle (5) reaches saturation, if yes, repeatedly modify the following structure parameters and execute S8 until the magnetic induction intensity inside the baffle (5) is not saturated: the inner diameter, the outer diameter and the height of the magnetic core (8); the inner diameter, the outer diameter and the height of the outer wall (9); the thickness of the upper cover (6); the baffle air gap; the baffle adjustment range; the permanent magnet installation distance; S10, repeatedly modify the structure parameters of S9 and perform S8 until the magnetic induction intensity inside the baffle (5) reaches the maximum value; the permanent magnet installation distance at this time is recorded as P o ; S11, the structure parameter determined according to S10 is used to manufacture the spring nozzle baffle permanent magnet type electrical conversion module, and the permanent magnet installation distance is adjusted under the condition that the electromagnetic coil (2) is not powered on, the pressure and flow of the gas are minimum, so that the baffle (5) moves to the maximum value of the baffle adjustment range; the permanent magnet installation distance at this time is recorded as P m ; S12, compare P m and P o then select a new spring (4) such that the difference between P m and P o does not exceed ±5% of P o ; the spring constant of the spring (4) at this time is denoted as K m ; S13, energize the solenoid (2) and set the pressure and flow of the gas to maximum, then adjust the current to the solenoid (2) so that the baffle (5) moves to the minimum of the baffle adjustment range; the current at this point is noted as I m ; S14, compare I o with I m and adjust the number of turns of the electromagnetic coil (2) according to the following formula: S15, the number of turns of the electromagnetic coil (2) in S8 is set to N m and S13 are repeatedly executed until the difference between I m and I o is not more than ±5% of I o ; S16, reducing I in S8 o S8-S15 are then repeatedly performed until I m satisfies the design requirements.

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