Design method and system for temperature control device of diaphragm storage tank

Abstract

The application provides a design method and system of a temperature control device of a diaphragm tank, comprising the following steps: step 1: the spherical tank is divided into latitude and longitude separation areas according to the gas-liquid distribution direction as the upper and lower hemispheres; step 2: the latitude and longitude grid formed on the surface of the spherical tank is used as a heating sheet sticking area, and the size of the single grid is used as the design size of the heating sheet; step 3: the geometric size of the i-th row of single-column heating sheets is defined, and the heating sheet is designed as an axisymmetric structure; step 4: the layout distance D of the heating sheet is designed; step 5: the size and power distribution of the heating sheet are designed according to the structural characteristics and shape size of the diaphragm tank; and step 6: the point sticking process is used to stick the heating sheet to the carbon fiber woven layer of the tank. The application realizes the lightweight and high-stability temperature control of the diaphragm tank with the carbon fiber woven surface layer and the aluminum alloy inner container.

Description

Technical Field

[0001] This invention relates to the field of aerospace thermal control technology, specifically to the design method and system of a temperature control device for a diaphragm tank, and in particular to a lightweight, high-stability temperature control device for a diaphragm tank and its design method. Background Technology

[0002] Diaphragm tanks use metal diaphragms to isolate the propellant from the pressurized gas. However, alternating temperature changes cause the propellant inside the tank to expand and contract, resulting in repeated fluctuations of the diaphragm in the same position, which can lead to diaphragm fatigue failure. Generally, spherical diaphragm tanks have a carbon fiber woven layer on the outside, which wraps around its aluminum alloy inner liner. The carbon fiber woven layer is made of carbon fiber strips woven on the surface of the aluminum alloy inner liner to form a spherical bamboo-like structure. The surface is uneven and has large gaps, with a roughness of more than 3mm. Active thermal control measures such as surface heating plates need to be applied to the surface. Silicone rubber needs to be used to fill the woven layer and wet the surface of the inner liner, which increases the weight of silicone rubber by more than the conventional heating plate application method.

[0003] The surface of a typical diaphragm tank is a smooth metal surface, which can be actively controlled by attaching conventional heating elements. However, this method cannot be used on uneven surfaces. For this type of tank, the temperature control device can only be implemented on the outermost carbon fiber braided layer. If heating elements or other active thermal control measures are attached to the surface of the carbon fiber braided layer, a thicker layer of silicone rubber needs to be applied to the corresponding position of the heating element according to its shape, filling the braided layer and impregnating the inner liner surface with silicone rubber before attaching the heating element. This method adds more silicone rubber weight than the conventional heating element attachment method, thereby increasing the launch weight of the spacecraft and increasing the spacecraft's payload.

[0004] Patent document CN109703043A discloses a method for attaching a deformation-resistant silicone rubber pad to a polyimide film-type heating element for spacecraft. The method includes: attaching a silicone rubber pad to the surface of a spacecraft gas cylinder; attaching a heating element, smaller than the silicone rubber pad, to the surface of the silicone rubber pad; and applying an additional layer of silicone rubber to the sides of the silicone rubber pad, scraping it into an angled shape. However, this patent document increases the weight of the silicone rubber, thus increasing the load on the spacecraft.

[0005] Patent document CN201124571Y discloses a pressure tool for attaching a heating element to a 10N thruster solenoid valve, comprising a binding strap, a pressure block fixed in the middle of the binding strap, and clamps on the edge of the binding strap for tightening the binding strap. The pressure block has symmetrical wedge shapes on both sides to compress the heating element as a whole; the longitudinal width of the wedge-shaped portion of the pressure block is greater than the width of the binding strap. However, this patent document differs from the technical solution of this invention.

[0006] The literature, "Analysis of On-Orbit Thermal Control Issues in Space Propulsion Systems" (Jia Shijin, Ming Zhangpeng, Liu Jianying, Fu Yang, Wang Guojun, *Spacecraft Environmental Engineering*, 2019, Vol. 2, pp. 165-170), analyzes the mechanisms of thermal control issues in long-term on-orbit spacecraft propulsion systems, focusing on the fatigue of propellant diaphragms due to thermal expansion and contraction and the overheating of engine valves. It summarizes the solutions and challenges for propellant thermal control and high-temperature conditions of engines and thrusters, proposes solutions based on a specific model, analyzes and predicts the effects of the improvements, and provides design suggestions for thermal control schemes for long-term on-orbit spacecraft. However, this literature does not disclose the device that ultimately achieves temperature control.

[0007] Patent document CN109613946B discloses a method for controlling the temperature disturbance of a spacecraft diaphragm tank on the working fluid volume, including S1, predicting the required temperature control target value for the diaphragm tank; S2, calculating the required heating amount of the diaphragm tank within a temperature control period based on the temperature control target value; S3, calculating the required heating duration within the temperature control period based on the required heating amount; and S4, heating the diaphragm tank according to the calculated heating amount and heating duration. However, this patent document differs from the technical solution of this invention. Summary of the Invention

[0008] In view of the deficiencies in the prior art, the purpose of this invention is to provide a design method and system for a temperature control device for a diaphragm tank.

[0009] The design method of a temperature control device for a diaphragm tank according to the present invention includes the following steps: Step 1: Divide the spherical storage tank into latitude and longitude sections according to the gas-liquid distribution direction to form latitude and longitude separated areas. The same longitude angle is one column and the same latitude angle is one row. Step 2: The warp and weft grid formed on the surface of the spherical tank is used as the area for attaching the heating element, and the unfolded size of a single grid is used as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-to-center span angle of every two adjacent heating elements is β; i = 1, 2, 3, ..., n; Step 3: Define the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;αi =α,r i =R 贮 R1=R 贮 θ i =ζ i The heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and the latitudinal span of two adjacent rows of heating elements and the longitudinal span angle of each column of heating elements are both α; the longitudinal span angle of the center of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; Step 4: Based on the simplified method in Step 3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; Step 5: Design the heating element size and power distribution based on the structural characteristics and shape of the diaphragm tank; Step 6: Use a spot-attach process to attach the heating element to the carbon fiber woven layer of the storage tank.

[0010] Preferably, in step 3, the following correspondence exists:

[0011] , , , , The dimensions of the heating element in the first row of a single column are as follows: upper edge radius R1, lower edge radius R2, upper and lower edge spacing L1, upper and lower edge angle α1, side edge angle θ1, and side radius R1; α i =α,r i =R 贮 R1=R 贮 θ i =ζ i .

[0012] Preferably, in step 3, the following correspondence exists: , .

[0013] Preferably, step 5 specifically includes the following steps: Step 5.1: Based on the layout of the heating elements on the hemisphere, design the same power density for each heating element; Step 5.2: Based on the characteristics of the heating element spot application, determine the radiative heat transfer relationship between the heating element and the storage tank; Step 5.3: Based on the thermal characteristics of the storage tank, the heating elements, and the power distribution of the heating elements, perform a thermal balance analysis. Based on the premise that the temperature of the heating elements does not exceed 80℃, obtain the initial value of the maximum power density under the design of each heating element size. Step 5.4: Based on the structural characteristics of the diaphragm tank, assign the same power density to the heating elements at the same latitude. During the thermal analysis, adjust and optimize the power density on the same column of heating elements. The optimization goal is to make the temperature fluctuation of the diaphragm tank less than ±1℃ and the liquid end temperature difference of the diaphragm tank less than 2℃. Obtain the power density and power distribution of each heating element specification. Step 5.5: Based on constraints such as remote control and telemetry resources and heating element production standards, connect heating elements of different specifications in series and parallel to form one or more heaters, and use the propellant outlet position of the storage tank as the temperature control point.

[0014] Preferably, in step 4, the spacing D of the heating element wiring layout is not less than 5mm.

[0015] Preferably, the heating element is bonded using a silicone rubber dot-applying process, in which dots of GD414 silicone rubber are applied to the bonding surface of the heating element for bonding.

[0016] Preferably, a standard 5mL syringe is used for dispensing, the height of the extruded glue column is 2mm to 5mm, and the diameter of the glue ball after pasting is 10mm.

[0017] Preferably, adhesive is applied at 20mm intervals along the edge of the heating element, and at approximately 40mm intervals along both the length and width of the heating element's interior, with adhesive also applied at the solder joints of the heating element's lead wires.

[0018] Preferably, the temperature control device uses a polyimide film heating element that is attached to the carbon fiber woven layer of the film storage tank by adhesive application.

[0019] The present invention also provides a design system for a temperature control device for a diaphragm tank, comprising the following modules: Module M1: The spherical storage tank is divided into latitude and longitude according to the gas-liquid distribution direction, forming latitude and longitude separated areas. The same longitude angle is a column and the same latitude angle is a row. Module M2: The latitude and longitude grid formed on the surface of the spherical tank is used as the bonding area for the heating element, and the unfolded size of a single grid is used as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-to-center span angle of every two adjacent heating elements is β; i = 1, 2, 3, ..., n; Module M3: Defines the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;α i =α,r i =R 贮 R1=R 贮 θ i =ζ i The heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and the latitudinal span of two adjacent rows of heating elements and the longitudinal span angle of each column of heating elements are both α; the longitudinal span angle of the center of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; Module M4: Based on the simplified method of Module M3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; Module M5: The size and power distribution of the heating elements are designed based on the structural characteristics and shape of the diaphragm tank; Module M6: The heating element is attached to the carbon fiber woven layer of the storage tank using a spot-attach process.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. Based on the characteristics and shape of the diaphragm storage tank, this invention designs the heating element size and heating element power distribution, thereby achieving highly stable temperature control of the carbon fiber woven surface aluminum alloy inner liner; 2. This invention also employs a silicone rubber dot bonding process to achieve lightweighting of the diaphragm storage tank with a carbon fiber woven surface and an aluminum alloy inner liner; 3. This invention can reduce the weight of silicone rubber used to attach heating elements to the carbon fiber braided layer, thereby achieving high-stability temperature control of the diaphragm storage tank. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A flowchart illustrating the design steps of the temperature control device for the diaphragm storage tank of the present invention. Figure 2 This is a flowchart illustrating the design principle of the temperature control device for the diaphragm tank of the present invention. Figure 3 The grid division and design dimensions of the heating elements on the surface of the spherical storage tank; Figure 4 This is a schematic diagram showing the dimensions of the heating elements in rows 1 and n. Figure 5 The size of the GD414 silicone rubber mass; Figure 6 A schematic diagram showing the dimensions of GD414 silicone rubber clumps coated. Figure 7 This is a schematic diagram of the final state of the temperature control device. Figure 8 This is a structural diagram of the temperature control device. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0023] Example 1: like Figures 1-8 As shown, this embodiment provides a design method for a temperature control device for a diaphragm storage tank, including the following steps: Step 1: Divide the spherical storage tank into latitude and longitude sections according to the gas-liquid distribution direction to form latitude and longitude separated areas. The same longitude angle is in one column, and the same latitude angle is in one row.

[0024] Step 2: Use the latitude and longitude grid formed on the surface of the spherical tank as the area for attaching the heating element, and use the unfolded size of each grid as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-major span angle of each pair of adjacent heating elements is β; i = 1, 2, 3, ..., n.

[0025] Step 3: Define the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;α i =α,r i =R 贮 R1=R 贮 θ i =ζ iThe heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and the latitudinal span of two adjacent rows of heating elements and the longitudinal span angle of each column of heating elements are both α; the longitudinal span angle of the center of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; The following correspondence exists:

[0026] , , , , The dimensions of the heating element in the first row of a single column are as follows: upper edge radius R1, lower edge radius R2, upper and lower edge spacing L1, upper and lower edge angle α1, side edge angle θ1, and side radius R1; α i =α,r i =R 贮 R1=R 贮 θ i =ζ i ; The following correspondence exists: , .

[0027] Step 4: Based on the simplified method in Step 3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; the wiring layout spacing D of the heating element shall not be less than 5mm.

[0028] Step 5: Design the heating element size and power distribution based on the structural characteristics and shape of the diaphragm tank; Step 5 specifically includes the following steps: Step 5.1: Based on the layout of the heating elements on the hemisphere, design the same power density for each heating element; Step 5.2: Based on the characteristics of the heating element spot application, determine the radiative heat transfer relationship between the heating element and the storage tank; Step 5.3: Based on the thermal characteristics of the storage tank, the heating elements, and the power distribution of the heating elements, perform a thermal balance analysis. Based on the premise that the temperature of the heating elements does not exceed 80℃, obtain the initial value of the maximum power density under the design of each heating element size. Step 5.4: Based on the structural characteristics of the diaphragm tank, assign the same power density to the heating elements at the same latitude. During the thermal analysis, adjust and optimize the power density on the same column of heating elements. The optimization goal is to make the temperature fluctuation of the diaphragm tank less than ±1℃ and the liquid end temperature difference of the diaphragm tank less than 2℃. Obtain the power density and power distribution of each heating element specification. Step 5.5: Based on constraints such as remote control and telemetry resources and heating element production standards, connect heating elements of different specifications in series and parallel to form one or more heaters, and use the propellant outlet position of the storage tank as the temperature control point.

[0029] Step 6: The heating element is bonded to the carbon fiber woven layer of the storage tank using a dot-bonding process. A silicone rubber dot-bonding process is also used, applying dots of GD414 silicone rubber to the bonding surface of the heating element. A standard 5mL syringe is used for dispensing, with the extruded glue column height being 2mm-5mm, resulting in a glue dot diameter of 10mm after bonding. Glue is applied every 20mm along the edge of the heating element, and approximately every 40mm along both the length and width of the interior of the heating element, including at the solder joints of the heating element's leads. The temperature control device uses a polyimide film heating element bonded to the carbon fiber woven layer of the membrane storage tank via a dot-bonding method.

[0030] Example 2: This embodiment also provides a design system for a temperature control device for a diaphragm tank, comprising the following modules: Module M1: The spherical storage tank is divided into latitude and longitude according to the gas-liquid distribution direction, forming latitude and longitude separated areas. The same longitude angle is a column and the same latitude angle is a row. Module M2: The latitude and longitude grid formed on the surface of the spherical tank is used as the bonding area for the heating element, and the unfolded size of a single grid is used as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-to-center span angle of every two adjacent heating elements is β; i = 1, 2, 3, ..., n; Module M3: Defines the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;α i =α,r i =R 贮 R1=R 贮 θ i =ζ i The heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and the latitudinal span of two adjacent rows of heating elements and the longitudinal span angle of each column of heating elements are both α; the longitudinal span angle of the center of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; Module M4: Based on the simplified method of Module M3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; Module M5: The size and power distribution of the heating elements are designed based on the structural characteristics and shape of the diaphragm tank; Module M6: The heating element is attached to the carbon fiber woven layer of the storage tank using a spot-attach process.

[0031] Example 3: Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0032] This embodiment provides a lightweight and highly stable temperature control device for a diaphragm tank and its design method. The heating element size and power distribution are designed according to the characteristics and shape of the diaphragm tank. A silicone rubber dot bonding process is used to achieve lightweight and highly stable temperature control for the diaphragm tank with a carbon fiber woven surface and an aluminum alloy inner liner. Polyimide thin film heating elements are used.

[0033] The design method of a lightweight, high-stability temperature control device for diaphragm tanks includes the following steps: Step 1: Divide the spherical storage tank into latitudinal sections according to the gas-liquid distribution direction as the upper or lower hemisphere, and longitudinal sections along the circumference, thus forming latitude and longitude separated regions. Each region is in a column within the same longitude angle and in a row within the same latitude angle. Step 2: Use the latitude and longitude grid formed on the surface of the spherical tank as the area for attaching the heating elements, and use the unfolded size of each grid as the design size of the heating element. Define the radius of the spherical tank as R1, the longitudinal span angle of one column of heating elements as α, and the latitudinal span of one row of heating elements as θ (the first row is θ1, the second row is θ2…θ). i …θ n The latitudinal span of the two adjacent heating elements is δ (the first row is δ1, the second row is δ2…δ). i …δ n The meridional span angle between the centers of the two adjacent heating elements is β. Step 3: The geometric dimension of the heating element in the i-th row and single column is the upper edge radius R. (2i-1) lower half radius R (2i) Spacing L between top and bottom edges i Angle α of the top and bottom edges, angle θ of the side edges i The side radius is R1, and the heating element has an axisymmetric structure. The relationship is as follows: (1); (2); (3); The dimensions of the heating element in the first row and single column are as follows: upper edge radius R1, lower half edge radius R2, upper and lower edge spacing L1, upper and lower edge angle α, side edge angle θ1, and side radius R1. (4); (5); Step 4: Given the radius R1 of the storage tank, the latitude and longitude grid on the surface of the sphere tank can be determined by setting θ, δ, and β. To simplify the design, the latitudinal span θ of each heating element is the same (θ1=θ2…=θ). i …=θ n The latitudinal span δ of two adjacent heating elements is the same (δ1=δ2…=δ). i …=δ n Each column of heating elements has a meridional span angle of α; they are generally arranged symmetrically, therefore, the meridional span angle between the centers of two adjacent columns of heating elements is β=2π / m (m is the number of columns in the meridional direction); Step 5: Based on the simplification method in Step 4, the processing size requirements of the heating element, and considering the wiring spacing D of the heating element, the following correspondence exists: (6); (7); D is generally not less than 5mm.

[0034] The power distribution of the heating elements is designed based on the characteristics and shape of the diaphragm tank, including the following steps: Step a: Based on the layout of the heating elements on the hemisphere, first design the same power density for each heating element; Step b: Based on the characteristics of the heating element spot application, there is only radiative heat exchange between the heating element and the storage tank; Step c: Based on the thermal characteristics of the storage tank and the heating elements and power distribution, perform a thermal balance analysis, ensuring the safety of the heating elements by taking the heating element temperature as not exceeding 80℃, and obtain the initial value of the maximum power density under each heating element size design. Step d: To simplify the assignment of heating element power values, and considering the structural characteristics of the storage tank, heating elements at the same latitude can be assigned the same power density. During the thermal analysis, the power density on the same row of heating elements is adjusted and optimized. The optimization target is that the storage tank temperature fluctuation is better than ±1℃ and the liquid end temperature difference is better than 2℃. This yields the power density and power distribution for each heating element specification. Step e: Finally, based on remote control and telemetry resources and heating element production standards, heating elements of different specifications are connected in series and parallel to form one or more heaters, with the propellant outlet position of the storage tank as the temperature control point.

[0035] Instead of the conventional uniform application method, apply GD414 silicone rubber in dots to the bonding surface of the heating element. Use a standard 5mL syringe for dispensing, extruding glue columns of 2mm to 5mm in height, and then apply the glue. The diameter of the glue dot after bonding is 10mm. Apply glue every 20mm along the edge of the heating element, and approximately every 40mm along both the length and width of the heating element's interior. Also apply glue to the solder joints of the heating element's leads.

[0036] Example 4: Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0037] To address the challenge of lightweight and highly stable temperature control in diaphragm tanks with spherical carbon fiber braided aluminum alloy inner liner, this embodiment designs the heating element size and power distribution based on the characteristics and shape of the diaphragm tank, and employs a silicone rubber dot-attach process, proposing a lightweight and highly stable temperature control device for diaphragm tanks and its design method.

[0038] This embodiment provides a design method for a lightweight, high-stability temperature control device for a diaphragm storage tank, comprising the following steps: Step 1: Divide the spherical storage tank into latitudinal sections according to the gas-liquid distribution direction as the upper or lower hemisphere, and longitudinal sections along the circumference, thus forming latitude and longitude separated regions. Each region is in a column within the same longitude angle and in a row within the same latitude angle. Step 2: Use the latitude and longitude grid formed on the surface of the spherical tank as the area for attaching the heating elements, and use the unfolded size of each grid as the design size of the heating element. Define the radius of the spherical tank as R1, the longitudinal span angle of one column of heating elements as α, and the latitudinal span of one row of heating elements as θ (the first row is θ1, the second row is θ2…θ). i …θ n The latitudinal span of the two adjacent heating elements is δ (the first row is δ1, the second row is δ2…δ). i …δ n The meridional span angle between the centers of the two adjacent heating elements is β. Step 3: The geometric dimension of the heating element in the i-th row and single column is the upper edge radius R. (2i-1) lower half radius R (2i) Spacing L between top and bottom edges i Angle α of the top and bottom edges, angle θ of the side edges i The side radius is R1, and the heating element has an axisymmetric structure. The relationship is as follows: (1); (2); (3); The dimensions of the heating element in the first row and single column are as follows: upper edge radius R1, lower half edge radius R2, upper and lower edge spacing L1, upper and lower edge angle α, side edge angle θ1, and side radius R1. (4); (5); Step 4: Given the radius R1 of the storage tank, the latitude and longitude grid on the surface of the sphere tank can be determined by setting θ, δ, and β. To simplify the design, the latitudinal span θ of each heating element is the same (θ1=θ2…=θ). i …=θ n The latitudinal span δ of two adjacent heating elements is the same (δ1=δ2…=δ). i …=δ n Each column of heating elements has a meridional span angle of α; they are generally arranged symmetrically, therefore, the meridional span angle between the centers of two adjacent columns of heating elements is β=2π / m (m is the number of columns in the meridional direction); Step 5: Based on the simplification method in Step 4, the processing size requirements of the heating element, and considering the wiring spacing D of the heating element, the following correspondence exists: (6); (7); D is generally not less than 5mm.

[0039] Step 6: Based on the heating element layout on the hemisphere described in claim 2, first design the same power density for each heating element; Step 7: Based on the characteristics of the heating element spot application, there is only radiative heat exchange between the heating element and the storage tank; Step 8: Based on the thermal characteristics of the storage tank and the heating elements and power distribution, perform a thermal balance analysis. Ensure the safety of the heating elements by ensuring that the temperature of the heating elements does not exceed 80℃, and obtain the initial value of the maximum power density under each heating element size design. Step 9: To simplify the assignment of heating element power values, and considering the structural characteristics of the storage tank, heating elements at the same latitude can be assigned the same power density. During the thermal analysis, the power density on the same row of heating elements is adjusted and optimized. The optimization target is that the storage tank temperature fluctuation is better than ±1℃ and the liquid end temperature difference is better than 2℃. This yields the power density and power distribution for each heating element specification. Step 10: Apply GD414 silicone rubber in dots to the bonding surface of the heating element instead of the conventional uniform application method; Step 11: Use a standard 5mL syringe to dispense the glue, with the glue column height being 2mm to 5mm, and then apply it. After application, the diameter of the glue ball will be 10mm. Step 12: Apply adhesive every 20mm along the edge of the heating element, and apply adhesive every 40mm along the length and width of the heating element inside the heating element. Also apply adhesive at the solder joints of the heating element lead wires. Step 13: Finally, based on remote control and telemetry resources and heating element production standards, heating elements of different specifications are connected in series and parallel to form one or more heaters, with the propellant outlet position of the storage tank as the temperature control point.

[0040] Example 5: Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0041] This embodiment provides a design method for a lightweight, high-stability temperature control device for a diaphragm storage tank, comprising the following steps: Step 1: Divide the sphere with radius R1 = 508 mm into 5 rows and 16 columns based on latitude and longitude; the longitudinal span angle α of the column heating element is 18°; the latitudinal span θ of the row heating element is 11.3°; the latitudinal span of two adjacent rows of heating elements is δ = 1.7°; the longitudinal span angle β of the center of two adjacent columns of heating elements is 22.5°. Step 2: According to formulas (1) to (7), the dimensions of heating element type 1 to heating element type 5 are calculated as follows: α=18°, θ1~θ5=11.3°, L1~L5=100.2mm, R1=508mm, R2=498.2mm, R3=495.0mm, R4=463.0mm, R5=456.6mm, R6=404.1mm, R7=394.8mm, R8=324.5mm, R9=312.8mm, R 10 =228.3mm; Step 3: Thermal analysis showed a power density of 0.01 W / cm³. 2 The maximum temperature of the heating element is 70℃. Step 4: Thermal analysis was conducted with the optimization targets of tank temperature fluctuation better than ±1℃ and liquid-end temperature difference better than 2℃. The power densities of heating elements 1 through 5 were adjusted, obtaining power densities of 0.01 W / cm³ for each type. 2 0.008 W / cm 2 0.003 W / cm 2 0.002 W / cm 2 0.003 W / cm 2 ; Step 5: Considering the heater power supply voltage of 30V and the resource conditions of two heaters (main and backup), we can choose 8 symmetrically distributed columns. Each column of heaters is connected in series and then connected in parallel to form one heater. Therefore, the main and backup heating elements are distributed at intervals in the longitude direction.

[0042] The temperature control device of the present invention designs the heating element size and heating element power distribution according to the characteristics and shape of the diaphragm tank, and adopts the silicone rubber dot bonding process to achieve lightweight and highly stable temperature control of the diaphragm tank with carbon fiber woven surface and aluminum alloy inner liner.

[0043] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, enabling the system and its various devices, modules, and units to function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0044] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A design method for a temperature control device for a diaphragm storage tank, characterized in that, Includes the following steps: Step 1: Divide the spherical storage tank into latitude and longitude sections according to the gas-liquid distribution direction to form latitude and longitude separated areas. The same longitude angle is one column and the same latitude angle is one row. Step 2: The warp and weft grid formed on the surface of the spherical tank is used as the area for attaching the heating element, and the unfolded size of a single grid is used as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-to-center span angle of every two adjacent heating elements is β; i = 1, 2, 3, ..., n; Step 3: Define the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;α i =α,r i =R 贮 R1=R 贮 θ i =ζ i The heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and adjacent rows of heating elements have the same latitudinal span, while the longitudinal span angle of each column of heating elements is α; the longitudinal span angle between the centers of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; Step 4: Based on the simplified method in Step 3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; The following correspondence exists: ， ； Step 5: Design the heating element size and power distribution based on the structural characteristics and shape of the diaphragm tank; Step 5 specifically includes the following steps: Step 5.1: Based on the layout of the heating elements on the hemisphere, design the same power density for each heating element; Step 5.2: Based on the characteristics of the heating element spot application, determine the radiative heat transfer relationship between the heating element and the storage tank; Step 5.3: Based on the thermal characteristics of the storage tank, the heating elements, and the power distribution of the heating elements, perform a thermal balance analysis. Based on the premise that the temperature of the heating elements does not exceed 80℃, obtain the initial value of the maximum power density under the design of each heating element size. Step 5.4: Based on the structural characteristics of the diaphragm tank, assign the same power density to the heating elements at the same latitude. During the thermal analysis, adjust and optimize the power density on the same row of heating elements. The optimization goal is to make the temperature fluctuation of the diaphragm tank less than ±1℃ and the liquid end temperature difference of the diaphragm tank less than 2℃. Obtain the power density and power distribution of each heating element specification. Step 5.5: Based on remote control and telemetry resources and heating element production standard constraints, connect heating elements of different specifications in series and parallel to form one or more heaters, and use the propellant outlet position of the storage tank as the temperature control point; Step 6: Use a spot-attach process to attach the heating element to the carbon fiber woven layer of the storage tank.

2. The design method of the temperature control device for the diaphragm storage tank according to claim 1, characterized in that, In step 3, the following correspondence exists: ， ， ， ， The dimensions of the heating element in the first row of a single column are as follows: upper edge radius R1, lower edge radius R2, upper and lower edge spacing L1, upper and lower edge angle α1, side edge angle θ1, and side radius R1; α i =α,r i =R 贮 R1=R 贮 θ i =ζ i .

3. The design method of the temperature control device for the diaphragm storage tank according to claim 1, characterized in that, In step 4, the spacing D of the heating element wiring layout is not less than 5mm.

4. The design method of the temperature control device for the diaphragm storage tank according to claim 1, characterized in that, The heating element is attached using a silicone rubber dot-attach process. GD414 silicone rubber dots are applied to the surface of the heating element and then attached.

5. The design method of the temperature control device for the diaphragm storage tank according to claim 4, characterized in that, The adhesive was dispensed using a standard 5mL syringe, with the extruded adhesive column height being 2mm to 5mm, resulting in an adhesive ball diameter of 10mm after bonding.

6. The design method of the temperature control device for the diaphragm storage tank according to claim 4, characterized in that, Apply adhesive every 20mm along the edge of the heating element, and apply adhesive every 40mm along the length and width of the heating element inside, and apply adhesive at the solder joints of the heating element lead wires.

7. The design method of the temperature control device for the diaphragm storage tank according to claim 1, characterized in that, The temperature control device uses a polyimide film heating element that is attached to the carbon fiber woven layer of the film storage tank by adhesive application.

8. A design system for a temperature control device for a diaphragm storage tank, characterized in that, Includes the following modules: Module M1: The spherical storage tank is divided into latitude and longitude according to the gas-liquid distribution direction, forming latitude and longitude separated areas. The same longitude angle is a column and the same latitude angle is a row. Module M2: The latitude and longitude grid formed on the surface of the spherical tank is used as the bonding area for the heating element, and the unfolded size of a single grid is used as the design size of the heating element. The radius of the spherical tank is R. 贮 The longitudinal span angle of each column of heating elements is α, and the latitudinal span angle of the i-th row of heating elements is ζ. i The latitudinal span angle between the i-th row and the (i+1)-th row is δ. i The center-to-center span angle of every two adjacent heating elements is β; i = 1, 2, 3, ..., n; Module M3: Defines the geometry of the heating element in the i-th row and single column, where the radius of the top edge is R. (2i-1) The radius of the lower edge is R. (2i) The distance between the top and bottom edges is L. i The angle between the upper and lower edges is α. i The lateral angle is θ i The lateral radius is r i ;α i =α,r i =R 贮 R1=R 贮 θ i =ζ i The heating elements are designed with an axisymmetric structure; each heating element has the same latitudinal span, and adjacent rows of heating elements have the same latitudinal span, while the longitudinal span angle of each column of heating elements is α; the longitudinal span angle between the centers of two adjacent columns of heating elements is β=2π / m, where m is the number of longitudinal distribution columns; Module M4: Based on the simplified method of Module M3 and the processing size requirements of the heating element, design the wiring layout spacing D of the heating element; The following correspondence exists: ， ； Module M5: Design the heating element size and power distribution based on the structural characteristics and shape of the diaphragm tank; specifically including the following steps: Based on the heating element layout on the hemispherical surface, each heating element is designed with the same power density; Based on the characteristics of the heating element spot application, the radiative heat transfer relationship between the heating element and the storage tank is determined; Based on the thermal characteristics of the storage tank, the heating elements, and the power distribution of the heating elements, a thermal balance analysis was conducted. Based on the premise that the temperature of the heating elements does not exceed 80℃, the initial value of the maximum power density under each heating element size design was obtained. Based on the structural characteristics of the diaphragm tank, the heating elements at the same latitude are assigned the same power density. During the thermal analysis, the power density on the same row of heating elements is adjusted and optimized. The optimization target is that the temperature fluctuation of the diaphragm tank is less than ±1℃ and the liquid end temperature difference of the diaphragm tank is less than 2℃. The power density and power distribution of each heating element specification are obtained. Based on remote telemetry resources and heating element production standard constraints, heating elements of different specifications are connected in series and parallel to form one or more heaters, with the propellant outlet position of the storage tank as the temperature control point. Module M6: The heating element is attached to the carbon fiber woven layer of the storage tank using a spot-attach process.

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