A general design method for solenoid valves of liquid rocket engines based on a prototype library

Abstract

The present invention discloses a general design method for the solenoid valve of a liquid rocket engine based on a prototype library, including: calculating the standard flow resistance of the solenoid valve according to the technical specifications of the solenoid valve to be designed; screening a set of prototypes that meet the above index requirements from the prototype library according to the standard flow resistance and the height and switching time in the technical specifications, and selecting the prototype product with the smallest mass in the prototype product set as the reference prototype; comparing the reference prototype with the technical specifications of the solenoid valve to be designed, and if it does not meet the design requirements, performing size and mass design based on the reference prototype to make the optimized reference prototype meet the design requirements.

Description

Technical Field

[0001] The present invention relates to a general design method for solenoid valves of liquid rocket engines based on a prototype library, belonging to the technical field of rocket engines. Background Art

[0002] In the fluid control system of liquid rocket engines, solenoid valves are widely used as switching actuators to control the opening and cutoff of fluids, enabling the engine to start repeatedly and operate in pulses, which has an important impact on the opening and closing dynamic characteristics of the engine. Direct-acting solenoid valves are widely used in liquid engines due to their simple structure, low cost, fast response, high reliability, etc.

[0003] Due to the large number of developed models and the fast iteration of models of liquid rocket engines, the traditional solenoid valve selection and design method can no longer meet the current diverse and rapidly iterative design requirements. At the same time, a large number of existing product design results have not been effectively referenced and utilized. Summary of the Invention

[0004] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, a general design method for solenoid valves of liquid rocket engines based on a prototype library is proposed. By comparing the differences between the new index requirements and the existing prototype data, and through an empirical estimation method based on the prototype data, the rapid prediction of the performance index parameters of new products is realized, meeting the need for rapid estimation of the performance of the product to be designed in the initial stage of product demonstration.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A general design method for solenoid valves of liquid rocket engines based on a prototype library includes:

[0007] Obtain the technical indicators of the solenoid valve to be designed, and calculate the standard flow resistance of the solenoid valve;

[0008] According to the standard flow resistance and the height and switching time in the technical indicators, screen out the prototype set that meets the above index requirements from the prototype library, and select the prototype product with the smallest mass in the prototype product set as the reference prototype;

[0009] Compare the reference prototype with the technical indicators of the solenoid valve to be designed. If it does not meet the design requirements, perform size and mass design based on the reference prototype to make the optimized reference prototype meet the design requirements.

[0010] Preferably, convert the flow resistance technical indicator of the propellant used to the flow resistance of water under a standard flow rate of 1 kg / s, and calculate the standard flow resistance of the solenoid valve:

[0011]

[0012] In the formula, Δpbz is the converted standard flow resistance; Δp yq is the rated flow resistance in the technical indicators; q mY is the rated flow rate in the technical indicators; ρ Y is the density of the propellant used.

[0013] Preferably, using the standard flow resistance as the first priority screening index, a set of primary selected prototypes with a standard flow resistance less than the first priority screening index is screened out from the prototype library; using the height index as the second screening index, a set of re-selected prototypes with a height less than the second screening index is screened out from the set of primary selected prototypes; using the opening time index and the closing time index as the third screening index, a set of prototypes with an opening time less than the opening time index requirement and a closing time less than the closing time index requirement is screened out from the set of re-selected samples.

[0014] Preferably, the size and mass design includes the nominal diameter, stroke, starting reaction force, switching time, armature diameter, inner diameter of the coil housing, outer diameter of the coil housing, magnetic shoulder width, solenoid valve height, length and width of the solenoid valve, and solenoid valve mass.

[0015] Preferably, calculate the nominal diameter and stroke of the solenoid valve to be designed:

[0016]

[0017] h2 = 0.2d 02

[0018] In the formula, d 02 is the nominal diameter of the solenoid valve to be designed, h2 is the stroke of the solenoid valve to be designed, d 01 is the nominal diameter of the reference prototype, h1 is the stroke of the reference prototype, Δp1 is the standard flow resistance of the reference prototype, Δp yq is the rated flow resistance in the technical indicators.

[0019] Preferably, calculate the starting reaction force F of the reference prototype and the solenoid valve to be designed lf1 and F lf2 ;

[0020]

[0021] In the formula, p is the medium pressure in the technical indicators, F th , k ms are respectively the spring pre-tightening force and the medium force direction of the reference prototype, and a and b are the valve port geometric parameters of the reference prototype;

[0022] Calculate the response magnification k tb :

[0023]

[0024] In the formula, the stroke uses h1 of the reference prototype and h2 of the solenoid valve to be designed, and the remaining air gap uses δ of the reference prototype g1 and δ of the solenoid valve to be designed g2 ;

[0025] Calculate the opening and closing times t of the solenoid valve to be designed k2 and t g2 ;

[0026] t k2 = k tb ·t k1

[0027] t g2 = k tb ·t g1

[0028] In the formula, t k1 , t g1 are the opening time and closing time of the reference prototype respectively.

[0029] Preferably, calculate the armature diameter D2 of the solenoid valve to be designed:

[0030]

[0031] In the formula, B δ is the designed magnetic flux density of the reference prototype, and d l is the pole removal diameter of the reference prototype.

[0032] Preferably, calculate the inner diameter D of the coil housing of the solenoid valve to be designed wn2 :

[0033] D wn2 = D2 + 0.2×10 -3 + 2δ bh + 2h k

[0034] In the formula, δ bh is the wall thickness of the skeleton of the reference prototype, and h k is the coil window width of the reference prototype;

[0035] Calculate the outer diameter D of the coil housing of the solenoid valve to be designed ww2 :

[0036]

[0037] Calculate the magnetic shoulder width b of the solenoid valve to be designed c2 :

[0038]

[0039] Preferably, the length, width, and height of the solenoid valve to be designed

[0040] Calculate the height l of the solenoid valve to be designed h2 :

[0041]

[0042] In the formula, l h1 is the height of the reference prototype, D ww1 is the outer diameter of the coil housing of the reference prototype, b c1 is the magnetic shoulder width of the reference prototype;

[0043] Calculate the length l of the solenoid valve to be designed l2 :

[0044] l l2 = l l1 + D ww2 - D ww1

[0045] In the formula, l l1 is the length of the reference prototype;

[0046] Calculate the width l of the solenoid valve to be designed w2 :

[0047] l w2 = l w1 + D ww2 - D ww1

[0048] In the formula, l w1 is the width of the reference prototype.

[0049] Preferably, calculate the mass m2 of the solenoid valve to be designed:

[0050]

[0051] In the formula, m1 is the mass of the reference prototype.

[0052] The present invention has the following beneficial effects compared with the prior art:

[0053] 1) The process-based model selection method proposed by the present invention can accurately and quickly locate the closest prototype. In the prior art, manual model selection analysis is adopted, and the model selection speed and quality depend on the experience level of the designer and the understanding of the performance of the existing products of the enterprise. It is easy to have the situation that the product to be designed appears in the occasion where the existing product can be selected, resulting in waste of design resources. The method provided by the present invention can effectively improve the productization degree of the solenoid valve products of the enterprise and effectively reduce unnecessary designs.

[0054] 2) The present invention creatively proposes a general design method. Through reasonable estimation of key parameters, the general design of a new solenoid valve that meets the performance index requirements can be quickly completed. In the prior art, generally, experienced designers estimate the key parameters of the product to be designed based on their own experience, which has great randomness and no unified standard. The quality of the estimated parameters depends on the experience level of the designers. Or, the full-process calculation of the detailed design of the solenoid valve is used to calculate the key parameters, with a large amount of calculation work and low calculation efficiency, and it cannot quickly respond to the adjustment of the index requirements. As a result, the system design iteration cycle is slowed down, making the preliminary system design work unable to meet the requirements of rapid bidding response and reducing the competitive advantage of the new system demonstration work. In addition, the general design method proposed by the present invention can also assist system designers in evaluating the relevant index requirements of the solenoid valves they propose, and immediately understand whether the index requirements are within the technical level range of existing solenoid valve products, and have a clear understanding of the feasibility or difficulty of achieving the index requirements. Description of the Drawings

[0055] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0056] Figure 1 is a schematic diagram of the structure of the solenoid valve in the embodiment of the present invention;

[0057] Figure 2 is a flowchart of the general design method of the solenoid valve in the embodiment of the present invention. Detailed Embodiments

[0058] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0059] The present invention proposes a general design method for the solenoid valve of a liquid rocket engine based on a prototype library. The following is a general design of the axial flow direct-acting solenoid valve as shown in Figure 1 as an embodiment of the present invention. The present invention is not limited to the solenoid valve of the above type.

[0060] Carry out a preliminary design for the newly developed axial direct-acting solenoid valve. The design method is as follows Figure 2 shown, including:

[0061] (1) Select the liquid engine type and propellant type, and input the technical specifications of the newly developed solenoid valve

[0062] The technical specifications include propellant type, rated flow resistance, rated flow rate, opening and closing time, medium pressure, height, and mass.

[0063] (2) Calculate the standard flow resistance of the solenoid valve according to the technical specifications

[0064]

[0065] In the formula: Δp bz is the converted standard flow resistance; Δp yq is the rated flow resistance required by the system; q mY is the rated flow rate required by the technical specifications; ρ Y is the density of the propellant used, obtained by querying according to the propellant type in step 1. This formula realizes the conversion of the flow resistance requirements of various propellants to the flow resistance of water at a standard flow rate of 1 kg / s. Selecting 1 kg / s as the standard flow rate is to avoid the flow resistance data for comparison being too small and inconvenient for comparison.

[0066] (3) Conduct a product data search, and screen the solenoid valves that meet the technical specifications in the prototype library according to a specific process

[0067] The prototype library stores the solenoid valve data of all series covering the enterprise product selection. Each piece of data includes standard flow resistance, diameter, stroke, spring pre-tightening force, medium force direction, valve port geometric parameters, remaining air gap, opening time, closing time, designed magnetic density, pole removal diameter, skeleton wall thickness, coil window width, coil housing outer diameter, magnetic circuit shoulder width, mass, length, width, height.

[0068] When screening the reference prototype, the screening conditions include standard flow resistance, height, opening time, and closing time. Since the flow capacity of the valve is the core index, the initial selection prototype set with a product standard flow resistance less than the calculated standard flow resistance is first screened from the prototype library. Since the height of the solenoid valve generally has a greater impact on the spatial layout of the engine system, the height index is the second screening index, and the re-selection prototype set with a height less than the index requirement is screened from the qualified products. Since the opening time and closing time of the solenoid valve often affect the power response speed and aftereffect impulse of the engine system, the third step is to screen the products with an opening time less than the index requirement and a closing time less than the index requirement from the products after height screening, which is the final qualified prototype set. Finally, since the solenoid valves equipped on liquid rocket engines have requirements for light weight, the prototype with the lightest mass needs to be selected from the screening results of the previous step as the reference prototype.

[0069] In this example, the screening is carried out based on the principle that the product flow resistance is less than the standard flow resistance, the product height is less than the technical index height, and the product opening and closing time is less than the technical index opening and closing time. The output results will be sorted in ascending order of mass.

[0070] (4) In the three screenings of step 3, if the prototype set screened in any one time is empty, it means that the products in the prototype library cannot meet the technical indexes of the newly developed solenoid valve. At this time, return to the previous prototype set and select the one with the smallest mass as the reference for the size and mass design of the newly developed solenoid valve. If the prototype set screened by the standard flow resistance is empty, directly select the prototype with the smallest standard flow resistance in the prototype library as the reference for the size and mass design of the newly developed solenoid valve. Then, carry out the size and mass design of the newly developed solenoid valve to obtain the mass and size parameters of the newly developed solenoid valve that meet the index requirements.

[0071] The size and mass design includes the diameter of the passage, the stroke, the starting reaction force, the response time, the diameter of the armature, the inner diameter of the coil housing, the outer diameter of the coil housing, the width of the magnetic shoulder, the height of the valve, the length and width of the valve, and the mass of the valve.

[0072] Calculate the diameter of the passage and the stroke of the newly developed solenoid valve:

[0073]

[0074] h2 = 0.2d 02

[0075] In the formula, d 02 is the diameter of the passage of the newly developed solenoid valve, h2 is the stroke of the newly developed solenoid valve, d 01 is the diameter of the passage of the reference prototype, h1 is the stroke of the reference prototype, Δp1 is the standard flow resistance of the reference prototype, and Δp yq is the flow resistance index requirement.

[0076] Calculate the starting reaction force F of the reference prototype and the newly developed solenoid valve lf1 and F lf2 :

[0077]

[0078] Wherein, the medium pressure p uses the index requirements of the newly developed solenoid valve, and F th , k ms are respectively the spring pre-tightening force and the medium force direction of the reference prototype, and a and b are the valve port geometric parameters of the reference prototype;

[0079] Calculate the response magnification factor k tb :

[0080]

[0081] Wherein, the strokes use h1 of the reference prototype and h2 of the newly developed solenoid valve respectively, and the remaining air gaps use δ g1 of the reference prototype and δ g2 of the newly developed solenoid valve;

[0082] Calculate the opening and closing times t k2 and t g2 :

[0083] t k2 = k tb ·t k1

[0084] t g2 = k tb ·t g1

[0085] Wherein, t k1 , t g1 are respectively the opening time and the closing time of the reference prototype.

[0086] Calculate the armature diameter D2 of the newly developed solenoid valve:

[0087]

[0088] Wherein, B δ is the designed magnetic density of the reference prototype, and d l is the pole removal diameter of the reference prototype.

[0089] Calculate the inner diameter D of the coil housing of the newly developed solenoid valve wn2 :

[0090] D wn2 = D2 + 0.2×10 -3 + 2δ bh + 2h k

[0091] In the formula, δ bh is the wall thickness of the skeleton of the reference prototype, and h k is the width of the coil window of the reference prototype.

[0092] Calculate the outer diameter D of the coil housing of the newly developed solenoid valve ww2 :

[0093]

[0094] Calculate the magnetic shoulder width b of the newly developed solenoid valve c2 :

[0095]

[0096] Calculate the height l of the newly developed solenoid valve h2 :

[0097]

[0098] In the formula, l h1 is the height of the reference prototype, D ww1 is the outer diameter of the coil housing of the reference prototype, and b c1 is the magnetic shoulder width of the reference prototype.

[0099] Calculate the length l of the newly developed solenoid valve l2 :

[0100] l l2 = l l1 + D ww2 - D ww1

[0101] In the formula, l l1 is the length of the reference prototype.

[0102] Calculate the width l of the newly developed solenoid valve w2 :

[0103] l w2 = l w1 + D ww2 - D ww1

[0104] In the formula, l w1 is the width of the reference prototype.

[0105] Calculate the mass of the newly developed solenoid valve:

[0106]

[0107] In the formula, m1 is the mass of the reference prototype.

[0108] If the obtained values of the opening and closing time, height, and mass still do not meet the index requirements, it indicates that the index requirements are too high and have exceeded the design level of the existing solenoid valves. The designers can feedback to the party that proposed the index requirements, negotiate whether the index can be adjusted, and when the detailed design work of the solenoid valve products needs to be carried out subsequently, focus on the non-compliant items exposed in the general design, and adopt the design method of breaking through the products in the prototype library to tackle and improve the performance level of the newly developed solenoid valves.

[0109] The above-described embodiments are only relatively preferred specific implementation manners of the present invention. The ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A general design method for solenoid valves of liquid rocket engines based on a prototype library, characterized in that, Including: Calculating the standard flow resistance of the solenoid valve to be designed according to the technical specifications of the solenoid valve to be designed; According to the standard flow resistance of the solenoid valve to be designed and the height index, opening time index, and closing time index in the technical specifications, screening a set of prototypes that meet the above index requirements from the prototype library, and selecting the prototype product with the smallest mass in the set of prototypes as the reference prototype; Comparing the reference prototype with the technical specifications of the solenoid valve to be designed. If the design requirements are not met, perform size and mass design based on the reference prototype. Among them, taking the standard flow resistance of the solenoid valve to be designed as the first priority screening index, screening out a set of preliminary selected prototypes with a standard flow resistance less than the first priority screening index from the prototype library; taking the height index as the second screening index, screening out a set of reselected prototypes with a height less than the second screening index from the set of preliminary selected prototypes; taking the opening time index and the closing time index as the third screening index, screening out a set of prototypes with an opening time less than the opening time index and a closing time less than the closing time index from the set of reselected prototypes; If the set of prototypes screened out at any time is empty, roll back to the previous set of prototypes, and select the prototype product with the smallest mass as the reference for the size and mass design of the solenoid valve to be designed; if the set of preliminary selected prototypes is empty, directly select the prototype product with the smallest standard flow resistance in the prototype library as the reference for the size and mass design of the solenoid valve to be designed; Calculating the nominal diameter and stroke of the solenoid valve to be designed: h2 = 0.2d 02 where d 02 is the nominal diameter of the solenoid valve to be designed, h2 is the stroke of the solenoid valve to be designed, d 01 is the nominal diameter of the reference prototype, h1 is the stroke of the reference prototype, Δp1 is the standard flow resistance of the reference prototype, Δp yq is the rated flow resistance in the technical specifications.

2. The general design method of the solenoid valve of a liquid rocket engine based on a prototype library according to claim 1, characterized in that, Converting the flow resistance technical index of the propellant used to the flow resistance of water under a standard flow rate of 1 kg / s, and calculating the standard flow resistance of the solenoid valve to be designed: where Δp bz is the standard flow resistance of the solenoid valve to be designed; Δp yq is the rated flow resistance in the technical specifications; q mY is the rated flow rate in the technical specifications; ρ Y is the density of the propellant used.

3. A general design method for the solenoid valve of a liquid rocket engine based on a prototype library according to claim 1, characterized in that, The size and mass design includes nominal diameter, stroke, starting reaction force, opening time, closing time, armature diameter, inner diameter of the coil housing, outer diameter of the coil housing, magnetic shoulder width, height of the solenoid valve, length of the solenoid valve, width of the solenoid valve, and mass of the solenoid valve.

4. A general design method for the solenoid valve of a liquid rocket engine based on a prototype library according to claim 3, characterized in that, Calculating the starting reaction force of the reference prototype and the solenoid valve to be designed: Where, F lf1 and F lf2 are the starting reaction forces of the reference prototype and the solenoid valve to be designed, respectively; p is the medium pressure in the technical specifications, F th , k ms are the spring pre-tightening force and the direction of the medium force of the reference prototype, respectively, a and b are the geometric parameters of the valve port of the reference prototype, d 01 is the nominal diameter of the reference prototype, d 02 is the nominal diameter of the solenoid valve to be designed; Calculate the response magnification factor k tb : Wherein, h1 is the stroke of the reference prototype, and h2 is the stroke of the solenoid valve to be designed; δ g1 is the remaining air gap of the reference prototype, and δ g2 is the remaining air gap of the solenoid valve to be designed; Calculating the opening time and closing time of the solenoid valve to be designed: t k2 = k tb ·t k1 t g2 = k tb ·t g1 where t k2 and t g2 are the opening time and closing time of the solenoid valve to be designed respectively, and t k1 , t g1 are the opening time and closing time of the reference prototype respectively.

5. A general design method for the solenoid valve of a liquid rocket engine based on a prototype library according to claim 4, characterized in that, Calculating the armature diameter D2 of the solenoid valve to be designed: Where B δ is the designed magnetic flux density of the reference prototype, d l is the pole removal diameter of the reference prototype, and F lf2 is the starting reaction force of the solenoid valve to be designed.

6. The general design method of the solenoid valve of a liquid rocket engine based on a prototype library according to claim 5, characterized in that, Calculate the inner diameter D of the coil housing of the solenoid valve to be designed wn2 : D wn2 = D2 + 0.2×10 -3 + 2δ bh + 2h k where δ bh is the wall thickness of the skeleton of the reference prototype, h k is the width of the coil window of the reference prototype, and D2 is the armature diameter of the solenoid valve to be designed; Calculate the outer diameter D of the coil housing of the solenoid valve to be designed ww2 : where d l is the pole removal diameter of the reference prototype; Calculate the magnetic shoulder width b of the solenoid valve to be designed c2 :

7. A general design method for the solenoid valve of a liquid rocket engine based on a prototype library according to claim 6, characterized in that, Calculate the height l of the solenoid valve to be designed h2 : Where, l h1 is the height of the reference prototype, D ww1 is the outer diameter of the coil housing of the reference prototype, D ww2 is the outer diameter of the coil housing of the solenoid valve to be designed, b c1 is the magnetic shoulder width of the reference prototype, b c2 is the magnetic shoulder width of the solenoid valve to be designed; Calculate the length l of the solenoid valve to be designed l2 : l l2 = l l1 + D ww2 - D ww1 where l l1 is the length of the reference prototype; Calculate the width l of the solenoid valve to be designed w2 : l w2 = l w1 + D ww2 - D ww1 where l w1 is the width of the reference prototype.

8. A general design method for the solenoid valve of a liquid rocket engine based on a prototype library according to claim 7, characterized in that, Calculating the mass m2 of the solenoid valve to be designed: Where, m1 is the mass of the reference prototype, l h2 is the height of the solenoid valve to be designed, D ww1 is the outer diameter of the coil housing of the reference prototype, D ww2 is the outer diameter of the coil housing of the solenoid valve to be designed.

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