A Parameter Calculation Method for a Three-Component Ratio Controller

Abstract

The present invention provides a method for calculating the parameters of a three-component ratio controller, and the method includes the following steps: S1. Calculate and determine the height of each housing of the ratio controller and the unit displacement of the volumetric metering component of the ratio controller according to the component ratio and the height of the ratio controller; S2. Calculate and determine the diameter of the leakage-proof rotor blade, the diameter of the leakage-proof rotor transmission shaft, the diameter of the displacement rotor blade, and the diameter of the displacement rotor transmission shaft according to the geometric structure relationship and the external dimension constraint of the volumetric metering component of the ratio controller; S3. Calculate the internal leakage amount and the ratio error in the volumetric metering component of the ratio controller, and evaluate whether the ratio controller meets the design requirements according to the ratio error. If the design requirements are not met, re-execute steps S1 to S2; S4. Calculate and determine the module and the number of teeth of the linkage gear between the leakage-proof rotor and the displacement rotor according to the rotational speed relationship between the displacement rotor and the leakage-proof rotor. The present invention can assist designers in quickly obtaining the key structural parameters of a reasonable three-component ratio controller.

Description

Technical Field

[0001] The present invention relates to a method for calculating controller parameters, in particular to a method for calculating the parameters of a three-component proportional controller, belonging to the technical field of flow metering and control. Background Art

[0002] The three-component proportional controller is a key component of the underwater thermal power energy supply system. Its mixing ratio and mixing accuracy determine the energy efficiency of the three-component propellant, and thus affect the efficiency and stability of the thermal power system. As Figure 1 shown, the three-component proportional controller essentially consists of three volumetric metering components with the same structure, coaxial and the same rotation speed in parallel. The three components of the propellant enter the three volumetric metering components of the proportional controller as shown in Figure 2 through their respective flow channels, and then enter the downstream mixer through their respective outflow channels. Theoretically, the volume flow ratio of the three components depends on the size ratio of the three volumetric metering components and is not affected by the external environment. Therefore, compared with the regulating valve type proportional controller, the volumetric proportional controller has the advantages of simple structure, no need for complex feedback control, good working condition adaptability, etc., and has good engineering application potential in the underwater thermal power energy supply system.

[0003] During actual operation, due to the inevitable presence of mating clearances in the volumetric metering components of the three-component proportional controller, internal leakage inevitably occurs, resulting in a decrease in the mixing ratio accuracy of the three-component propellant, thus affecting the performance of the three-component propellant. The internal leakage of the three-component proportional controller is determined by the structural parameters of the volumetric metering components, the working pressure difference and the mating clearance. The internal leakage of the volumetric metering components can be analyzed theoretically to evaluate the mixing ratio error of the proportional controller, providing a reference basis for the design of the three-component proportional controller.

[0004] The design task of the three-component proportional controller is to calculate and give the structural parameters of the three-component proportional controller that meet the requirements of the mixing ratio and accuracy according to the given total volume flow rate Q of the three-component propellant, the component ratio A i of the proportional controller, the working rotation speed n and the external dimensions of length, width and height L × W × H conditions. As Figure 3 shown, its structural parameters include the height B i of each housing of the proportional controller, the diameter D b 、 of the leakage-resistant rotor blade, the diameter D bh of the leakage-resistant rotor transmission shaft, the diameter D p, the diameter of the displacement rotor transmission shaft D ph etc. At the same time, its design tasks also include evaluating the internal leakage of each set of volumetric metering components Q Li and the proportional error E i , determining the module m and the number of teeth z of the leakage-proof rotor and the displacement rotor gear.

[0005] The structural design of the three-component proportional controller is extremely complex, and its application scenarios are also relatively special. At present, there is a lack of systematic and procedural methods for designing and calculating the structural parameters of the proportional controller in the relevant field, as well as a theoretical calculation model for the internal leakage of volumetric metering components, which to a certain extent restricts its iterative optimization and engineering applications. Summary of the Invention

[0006] Based on the above background, the purpose of the present invention is to provide a method for calculating the parameters of a three-component proportional controller to solve the problems described in the background technology.

[0007] To achieve the above invention purpose, the present invention provides the following technical solutions:

[0008] A method for calculating the parameters of a three-component proportional controller, the method comprising the following steps:

[0009] S1. Calculate and determine the height of each set of the controller housing and the unit displacement of the volumetric metering components of the proportional controller according to the component ratio and the height of the proportional controller;

[0010] S2. Calculate and determine the diameter of the leakage-proof rotor blade, the diameter of the leakage-proof rotor transmission shaft, the diameter of the displacement rotor blade, and the diameter of the displacement rotor transmission shaft according to the geometric structure relationship and the external dimension constraints of the volumetric metering components of the proportional controller, wherein the geometric structure relationship and the external dimension constraints include the following relational expressions:

[0011] ;

[0012] In the formula, D p is the diameter of the displacement rotor blade, D ph is the diameter of the displacement rotor transmission shaft, D b is the diameter of the leakage-proof rotor blade, D bh is the diameter of the leakage-proof rotor transmission shaft, t is the edge thickness of the leakage-proof rotor blade, ph is the minimum distance between the displacement rotor blade and the leakage-proof rotor blade, s For the matching clearance, L is the proportional controller length, k is the shell thickness, W is the proportional controller width, q r The unit displacement of the volumetric measuring component of the proportional controller;

[0013] S3, calculating the internal leakage of the volumetric measuring component of the proportional controller and the proportional error, and evaluating whether the proportional controller meets the design requirements according to the proportional error. If it does not meet the design requirements, re-execute steps S1 to S2; if it meets the design requirements, continue to execute step S4;

[0014] S4. According to the rotational speed relationship between the displacement rotor and the leakage-blocking rotor, the module and the number of teeth of the linkage gear between the leakage-blocking rotor and the displacement rotor are calculated and determined.

[0015] Preferably, the step S1 specifically includes the following steps:

[0016] Component ratio A i , Proportional controller height H And the height of each housing of the proportional controller B i The relationship between them is:

[0017] ;

[0018] The sum of the heights of the three shell layers is equal to the height of the proportional controller;

[0019] Total volume flow Q , component ratio A i 、Height of each shell B i and proportional controller speed n Volumetric metering components with proportional controllers Unit displacement q r The relationship between them is:

[0020] ;

[0021] Solve the combined equations to calculate the height of each housing of the proportional controller B i and proportional controllers volumetric metering components unit displacement q r .

[0022] Preferably, the component ratio A i , Proportional controller height HAnd the height of each housing of the proportional controller B i The relational expressions specifically include:

[0023] ;

[0024] The total volume flow rate Q 、Component ratio A i 、The height of each housing B i And the rotational speed of the proportional controller n And the unit displacement of the volumetric metering component of the proportional controller q r The relational expressions specifically include:

[0025] .

[0026] Preferably, in the step S2, the relational expressions of the geometric structure relationship and the external dimension constraints specifically include:

[0027] .

[0028] Preferably, in the step S2, the minimum distance ph between the displacement rotor blade and the leakage-proof rotor blade is 1 mm, and the fit clearance s is 0.02 mm, and the housing thickness k is 7 mm.

[0029] Preferably, in the step S3, calculating the internal leakage amount and the proportional error of the volumetric metering component of the proportional controller specifically includes the following steps:

[0030] The internal leakage amount of the volumetric metering component of the proportional controller Q Li 、The working pressure difference Δ P 、The fit clearance s 、The component viscosity μ i Satisfy the relational expression:

[0031] ;

[0032] In the formula, is the laminar leakage term, is the orifice submerged outflow leakage term, C l is the laminar outflow coefficient, C v is the orifice outflow coefficient, Bi is the characteristic width of the clearance between the displacement rotor and the leakage-blocking rotor, S i is the characteristic length of the clearance between the displacement rotor and the leakage-blocking rotor, P i is the component density

[0033] Proportional error E i , total volume flow rate Q , component ratio A i , internal leakage of the volumetric metering component of the proportional controller Q Li satisfy the relational expression:

[0034] .

[0035] Preferably, the proportional error E i , total volume flow rate Q , component ratio A i , internal leakage of the volumetric metering component of the proportional controller Q Li The relational expression specifically includes:

[0036] .

[0037] Preferably, in step S3, evaluating whether the proportional controller meets the design requirements specifically includes the following steps:

[0038] Compare the absolute value of the proportional error with a preset threshold. If the absolute value of the proportional error is less than the preset threshold, the proportional controller meets the design requirements; otherwise, the proportional controller does not meet the design requirements.

[0039] Preferably, step S4 specifically includes the following steps:

[0040] Number of gear teeth z , diameter of the leakage-blocking rotor D b and the diameter of the transmission shaft of the displacement rotor D ph satisfy the relational expression:

[0041] .

[0042] In the formula, z 1 is the number of gear teeth of the leakage-blocking rotor gear, z 2 is the number of gear teeth of the displacement rotor gear, and z 1 and z 2 satisfy the relational expression z 1 =z 2.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] A method for calculating the parameters of a three-component proportional controller of the present invention provides a systematic and standardized design calculation method for the structural parameters of the three-component proportional controller, overcomes the disadvantages of traditional design relying on personal experience, can assist designers in quickly obtaining the key structural parameters of a reasonable three-component proportional controller, and conveniently and quickly evaluates the proportional error of the designed proportional controller. This method can be combined with a computer for programmed design and optimization, overcoming the problems of difficult optimization and low design efficiency in traditional manual design. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0046] Figure 1 is a three-dimensional structural schematic diagram of a three-component proportional controller in the prior art;

[0047] Figure 2 is an internal structural schematic diagram of the volume measurement component of a three-component proportional controller in the prior art;

[0048] Figure 3 is a structural parameter schematic diagram of a three-component proportional controller in the prior art;

[0049] Figure 4 is a flow schematic diagram of a method for calculating the parameters of a three-component proportional controller of the present invention;

[0050] Figure 5 is a schematic diagram of the internal leakage analysis software of the proportional controller of the present invention;

[0051] Figure 6 is a schematic diagram of the gear set structure of the proportional controller of the present invention;

[0052] Figure 7 is a physical diagram of a three-component proportional controller designed and processed according to a method for calculating the parameters of a three-component proportional controller of the present invention;

[0053] Figure 8 is an experimental data diagram of a three-component proportional controller designed and processed according to a method for calculating the parameters of a three-component proportional controller of the present invention;

[0054] In the figure: 1. Displacement rotor; 2. Displacement rotor transmission shaft; 3. Leakage prevention rotor; 4. Leakage prevention rotor transmission shaft; 5. Displacement rotor gear; 6. Leakage prevention rotor gear. Detailed implementation mode

[0055] The following is a further detailed description of the technical solution of the present invention through specific embodiments in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any formal modification and / or change made to the present invention will fall within the protection scope of the present invention.

[0056] In the present invention, unless otherwise specified, all parts and percentages are in weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified. The components or equipment in the following embodiments are all general standard parts or components known to those skilled in the art, and their structures and principles can all be known through technical manuals or obtained through conventional experimental methods by those skilled in the art.

[0057] An embodiment of the present invention discloses a method for calculating the parameters of a three-component proportional controller, and the method includes the following steps:

[0058] S1. Calculate and determine the height of each set of the housing of the proportional controller and the unit displacement of the volumetric metering component of the proportional controller according to the component ratio and the height of the proportional controller;

[0059] S2. Calculate and determine the diameter of the leakage prevention rotor blade, the diameter of the leakage prevention rotor transmission shaft, the diameter of the displacement rotor blade, and the diameter of the displacement rotor transmission shaft according to the geometric structure relationship and the external dimension constraint of the volumetric metering component of the proportional controller, where the geometric structure relationship and the external dimension constraint include the following relational expressions:

[0060] ;

[0061] In the formula, D p is the diameter of the displacement rotor blade, D ph is the diameter of the displacement rotor transmission shaft, D b is the diameter of the leakage prevention rotor blade, D bh is the diameter of the leakage prevention rotor transmission shaft, t is the edge thickness of the leakage prevention rotor blade, ph is the minimum distance between the displacement rotor blade and the leakage prevention rotor blade, s is the fit clearance, L is the length of the proportional controller, k is the housing thickness, W is the width of the proportional controller, q r is the unit displacement of the volumetric metering component of the proportional controller;

[0062] S3. Calculate the internal leakage and proportional error of the volumetric metering component of the proportional controller. According to the proportional error, evaluate whether the proportional controller meets the design requirements. If it does not meet the design requirements, re - execute steps S1 - S2. If it meets the design requirements, continue to execute step S4;

[0063] S4. Calculate and determine the module and number of teeth of the interlocking gear between the leakage - resistant rotor and the displacement rotor according to the rotational speed relationship between the displacement rotor and the leakage - resistant rotor.

[0064] The following makes a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments can also be implemented by those skilled in the art without these specific details.

[0065] I. Design Calculation and Evaluation Given Conditions of the Three - Component Proportional Controller

[0066] Table 1 gives the given conditions and data for the structural parameter calculation of the three - component proportional controller. The working medium is the three - component propellant, and the densities and viscosities of the three components are P 1 = 1000 kg / m 3 , P 2 = 1200 kg / m 3 , P 1 = 2040 kg / m 3 and 1 = 2.4 mPa·s, 2 = 1.8 mPa·s, 3 = 1.0 mPa·s. The total volume flow rate of the three - component propellant Q = 60 L / min, component ratio A 1 = 1.0, A 2 = 2.0 and A 3 = 3.0, the working rotational speed of the proportional controller n = 625 r / min, the external dimensions of the proportional controller length × width × height are L = 104 mm × W = 90 mm × H = 60 mm.

[0067] Table 1 Input Conditions for the Structural Parameter Design Calculation of the Three - Component Proportional Controller

[0068]

[0069] II. Design Calculation Tasks

[0070] The design calculation tasks are to obtain the key structural parameters and performance parameters of the three-component proportional controller, including: the height of each set of the housing of the proportional controller B i , the diameter of the leakage-proof rotor blade D b 、 the diameter of the transmission shaft of the leakage-proof rotor D bh , the diameter of the displacement rotor blade D p the diameter of the transmission shaft of the displacement rotor D ph , the module of the linkage gear m and the number of teeth z , the internal leakage of each set of volume metering components Q Li , the proportional error E i .

[0071] III. Design Calculation Process

[0072] As Figure 4 shown, the design calculation is divided into four steps, namely: 1. Calculate and determine the height of each set of the housing of the proportional controller B i and the unit displacement q r ; 2. Calculate and determine the diameter of the leakage-proof rotor blade D b 、 the diameter of the transmission shaft of the leakage-proof rotor D bh , the diameter of the displacement rotor blade D p , the diameter of the transmission shaft of the displacement rotor D ph ; 3. Calculate the internal leakage of each set of volume metering components Q Li and the proportional error E i ; 4. Calculate and determine the module of the linkage gear between the leakage-proof rotor and the displacement rotor m and the number of teeth z .

[0073] Step 1: According to A i / H - B i and A i / Q / B i / n-q r Based on the relationship, calculate and determine the height of each housing of the proportional controller B i and the unit displacement q r . Specific steps:

[0074] The component ratio A i Theoretically equals the ratio between the heights of three layers of the housing, and the sum of the heights of the three layers of the housing B i is equal to the total height of the proportional controller B i . The functional relationship among the three is as follows H , that is

[0075] ;

[0076] Solve the equation to obtain that the heights of the three layers of the housing are respectively B 1 = 10mm, B 2 = 20mm, and B 3 = 30mm.

[0077] The total volume flow rate Q and the component ratio A i determine the volume flow rate of each component. Moreover, the height of each housing B i and the operating speed n are negatively correlated with the unit displacement of the proportional controller q r , and there is a functional relationship, that is

[0078] ;

[0079] Solve the equation to obtain the unit displacement of the volumetric metering component of the proportional controller q r = 1.25 mL / r.

[0080] Second step: According to the working principle and geometric relationship of the volumetric metering component of the proportional controller, calculate and determine the diameters of the leakage-proof rotor blades D b 、 the diameter of the leakage-proof rotor transmission shaft D bh , the diameter of the displacement rotor blades D p , and the diameter of the displacement rotor transmission shaft D ph , these four key structural parameters. Specific steps:

[0081] The two displacement rotors and the leakage prevention rotor cooperate alternately without interference. The blade diameter of the displacement rotor D p and the diameter of its transmission shaft D ph 、the blade diameter of the leakage prevention rotor D b and the diameter of its transmission shaft D bh 、as well as the relevant clearances have a functional relationship, that is

[0082] ;

[0083] In the formula d t is the edge thickness of the blade of the leakage prevention rotor, ph is the minimum distance between the blade of the displacement rotor and the blade of the leakage prevention rotor, s is the mating clearance.

[0084] The blade diameters of the two displacement rotors D p and their center distance largely determine the length of the proportional controller L , and considering the thickness of the housing k , there is a geometric functional relationship, that is

[0085] ;

[0086] The blade diameter of the displacement rotor D p and the diameter of its transmission shaft D ph 、the blade diameter of the leakage prevention rotor D b and the thickness of the housing k determine the width of the proportional controller W , there is a geometric functional relationship, that is

[0087] ;

[0088] According to the working principle of the volumetric metering component, its displacement q r and D p 、 D ph have a functional relationship, that is

[0089] ;

[0090] During design, the mating clearance is generally taken as 0.02 mm, that is ds = 0.02 mm. The minimum distance between the displacement rotor blade and the leakage-proof rotor blade is generally taken as 1.0 mm, that is ph = 1.0 mm. The thickness of the housing is generally taken as about 7.0, that is k = 7.0 mm.

[0091] At this time, there are only D p , D ph , D b and D bh Four key parameters that have not been determined yet. Therefore, by solving the system of equations composed of the above equations simultaneously, we can obtain D b = 47 mm, 、D bh = 8 mm, D p = 41, and D ph = 10 mm.

[0092] Step 3: According to the clearance leakage theory, calculate the internal leakage volume Q Li and the proportional error E i . Specific steps:

[0093] The internal leakage of the proportional controller is divided into laminar flow under the action of pressure difference shear and orifice submerged outflow under the action of pressure difference. Among them, the end face clearance and radial clearance leakage between the displacement rotor and the leakage-proof rotor belong to laminar flow leakage, while the clearance leakage between the leakage-proof rotor and the displacement rotor belongs to orifice submerged outflow.

[0094] After the key parameters of the volume metering component of the proportional controller are determined, its internal leakage volume Q Li and the working pressure difference Δ P , the mating clearance s and the component viscosity μ i have a functional relationship, that is

[0095] ;

[0096] In the formula, the first term is laminar flow leakage, and the second term is orifice submerged outflow leakage. C l is the laminar flow discharge coefficient, C v is the orifice outflow discharge coefficient, Si is the characteristic length of the clearance between the displacement rotor and the leakage-preventing rotor, from which the internal leakage can be calculated Q Li .

[0097] The theoretical flow rate of each volumetric metering component depends on the total volumetric flow rate Q and A i . At the same time, according to the calculated internal leakage Q Li , the proportional error of each volumetric metering component is calculated through the following function E i , that is

[0098] ;

[0099] The internal leakage of each volumetric metering component can be calculated through the above two formulas Q Li and the proportional error E i to evaluate the performance of the designed proportional controller. According to the above formulas, software for analyzing the internal leakage of the proportional controller has been developed, which can conveniently and quickly obtain the internal leakage of the proportional controller, as Figure 5 shown. Table 2 gives the internal leakage and proportional error of each volumetric metering component of the proportional controller

[0100] Table 2 Internal leakage and proportional error at a working pressure difference of 0.1 MPa

[0101]

[0102] Step 4: According to the rotational speed relationship between the displacement rotor and the leakage-preventing rotor, calculate and determine the module m and the number of teeth z of the linkage gear between the leakage-preventing rotor and the displacement rotor. Specific steps

[0103] The center distance of the gear set is equal to the center distance between the displacement rotor and the leakage-preventing rotor. The number of teeth z 1 of the leakage-preventing rotor gear and the number of teeth z 2 of the displacement rotor gear are in a functional relationship with the diameter D b of the leakage-preventing rotor and the diameter D pb of the transmission shaft of the displacement rotor, that is

[0104] ;

[0105] Generally, the module and pressure angle of the gear are taken as 0.5 and 20° during design, that is m = 0.5 and α = 20°, and the number of teeth z1 is the number of teeth of the displacement rotor gear z which is twice that of 2, from which the number of teeth can be determined z z1 = 38 and z2 = 19. The designed gear set is as Figure 6 shown

[0106] So far, the key structural parameters of the three-component proportional controller have all been obtained. According to the above ideas and methods, the three-component proportional controller has been designed and processed. The physical object is as Figure 7 shown. In addition, the performance of the designed three-component proportional controller has been experimentally tested, as Figure 8 shown. It can be seen from the figure that the component ratio of the three-component proportional controller is relatively stable within the full flow range

[0107] In this paper, specific examples are used to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention

Claims

1. A method for calculating the parameters of a three-component proportional controller, characterized in that: The method comprises the following steps: S1. Calculate and determine the height of each housing of the proportional controller and the unit displacement of the volumetric metering component of the proportional controller according to the component ratio and the height of the ratio controller; S2. Calculate and determine the diameter of the leakage-proof rotor blade, the diameter of the leakage-proof rotor transmission shaft, the diameter of the displacement rotor blade and the diameter of the displacement rotor transmission shaft according to the geometric structure relationship and the outer dimension constraint of the volumetric metering component of the proportional controller, wherein the geometric structure relationship and the outer dimension constraint include the following relational expressions: ； Wherein, D p is the diameter of the displacement rotor blade, D ph is the diameter of the displacement rotor drive shaft, D b is the diameter of the leakage prevention rotor blade, D bh is the diameter of the leakage prevention rotor drive shaft, t is the edge thickness of the leakage prevention rotor blade, ph is the minimum distance between the displacement rotor blade and the leakage prevention rotor blade, s is the fit clearance, L is the length of the proportional controller, k is the thickness of the housing, W is the width of the proportional controller, q r is the unit displacement of the volumetric metering component of the proportional controller; S3. Calculate the internal leakage amount and the proportional error of the volumetric metering component of the proportional controller, and evaluate whether the proportional controller meets the design requirements according to the proportional error. If the design requirements are not met, steps S1 to S2 are executed again. If the design requirements are met, step S4 is continued; wherein, calculating the internal leakage amount and the proportional error of the volumetric metering component of the proportional controller specifically includes the following steps: Internal leakage of the proportional controller volume metering component Q Li , working pressure difference Δ P , fit clearance = s , component viscosity i satisfy the relational expression: ; In the formula, is the laminar leakage term, is the orifice submerged outflow leakage term, C l is the laminar outflow coefficient, C v is the orifice outflow coefficient, B i is the characteristic width of the clearance between the displacement rotor and the leakage-resistant rotor, S i is the characteristic length of the clearance between the displacement rotor and the leakage-resistant rotor, P i is the component density; Proportional error E i and total volume flow rate Q and component ratio A i and the internal leakage of the proportional controller volume metering component Q Li satisfy the relational expression: ; S4. Calculate and determine the module and the number of teeth of the linkage gear between the leakage-proof rotor and the displacement rotor according to the rotational speed relationship between the displacement rotor and the leakage-proof rotor.

2. A method for calculating the parameters of a three-component ratio controller according to claim 1, characterized in that: The specific steps of step S1 include the following steps: Component ratio A i , the height of the ratio controller H and the height of each set of the housing of the ratio controller B i satisfy the relational expression: ; The sum of the heights of the three-layer housing is equal to the height of the proportional controller; Total volume flow rate Q 、Component ratio A i 、Height of each set of housing B i And rotational speed of the proportional controller n And the unit displacement of the volumetric metering component of the proportional controller q r Satisfy the relational expression: ; Solve the simultaneous equations to calculate and determine the height of each housing of the proportional controller B i and the unit displacement of the volumetric metering component of the proportional controller q r .

3. A method for calculating the parameters of a three-component ratio controller according to claim 2, characterized in that: The component ratio A i , the height of the ratio controller H and the height of each housing of the ratio controller B i The relational expressions specifically include: ; The total volume flow rate Q and component ratio A i and the height of each set of housings B i and the rotational speed of the proportional controller n The relationship with the unit displacement of the volumetric metering component of the proportional controller q r specifically includes: 。 4. A method for calculating parameters of a three-component ratio controller according to claim 1, characterized in that: In step S2, the relational expressions of the geometric structure relationship and the outer dimension constraint specifically include: 。 5. A method for calculating the parameters of a three-component ratio controller according to claim 1, characterized in that: In the said step S2, the minimum distance between the displacement rotor blade and the leakage prevention rotor blade ph is 1 mm, and the fit clearance d s is 0.02 mm, and the housing thickness k is 7 mm.

6. A method for calculating the parameters of a three-component ratio controller according to claim 1, characterized in that: In step S3, evaluating whether the proportional controller meets the design requirements specifically includes the following steps: Compare the absolute value of the proportional error with a preset threshold. If the absolute value of the proportional error is less than the preset threshold, the proportional controller meets the design requirements; otherwise, the proportional controller does not meet the design requirements.

7. A method for calculating the parameters of a three-component ratio controller according to claim 1, characterized in that: The specific steps of step S4 include the following steps: Number of teeth of the gear z , diameter of the leakage-blocking rotor D b , and diameter of the drive shaft of the displacement rotor D ph satisfy the relational expression: ； In the formula, z 1 is the number of teeth of the leakage-proof rotor gear, z 2 is the number of teeth of the displacement rotor gear, and z 1 and z 2 satisfy the relational expression z 1 = 2 z 2.

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