Detection system, detection method and launch vehicle

Abstract

The embodiments of the present application provide a detection system, a detection method and a launch vehicle, and relate to the field of launch vehicle technology. The detection system includes: a pressurizing device, which is used to connect to the inlet of the tank in the first detection stage, apply the pressure in the tank to a first predetermined pressure and maintain it for a first predetermined time; a load-bearing tool, which is used to be fixedly connected to the front bottom structure of the tank and at least partially contact or partially fit the front bottom structure, so that in the second detection stage, the pressurizing device applies the internal pressure of the tank to a second predetermined pressure and maintains it for a second predetermined time; the first predetermined pressure is the detection pressure that the front bottom structure meets the design requirements, and the second predetermined pressure is the detection pressure that the rear bottom structure of the tank meets the design requirements. The embodiments of the present application realize that according to the different pressure loads that the front bottom structure and the rear bottom structure need to bear in actual applications, the pressure detection of the front bottom structure and the rear bottom structure is performed separately to ensure the accuracy of the pressure detection of the tank.

Description

Technical Field

[0001] The present application relates to the field of launch vehicle technology. Specifically, the present application relates to a detection system, a detection method and a launch vehicle. Background Art

[0002] The power system of a launch vehicle usually has two or more tanks, which are filled with propellant. During the actual flight of the launch vehicle, the tanks are also in high-speed motion with the launch vehicle. Before the launch of the launch vehicle, the strength performance of the tanks needs to be tested.

[0003] For a tank storing propellant, during the flight of a rocket, the actual pressure on the rear tank bottom structure is often greater than that on the front tank bottom structure. However, at present, in order to ensure that the strength performance of the tank not only meets the flight needs of the launch vehicle, but also ensures the safety of ground acceptance, a unified pressure load is used for product acceptance during the acceptance of the propellant tank. As a result, the front tank bottom and the rear tank bottom are designed with the same wall thickness. When loading the pressure, the tank bottom that is subjected to greater force in the flight state must be considered, that is, the pressure acceptance value of the tank bottom structure after loading is used as the benchmark, resulting in the front tank bottom structure being loaded with a pressure higher than the actual acceptance pressure load during ground acceptance, resulting in inaccurate pressure detection of the tank. Summary of the invention

[0004] The present application proposes a detection system, a detection method and a launch vehicle to solve the technical problem of inaccurate pressure detection of a tank in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a detection system, including:

[0006] A pressurizing device, used to be connected to the inlet of the tank in the first detection stage, to apply the pressure in the tank to a first predetermined pressure and maintain it for a first predetermined time;

[0007] The load-bearing tool is used to be fixedly connected to the front bottom structure of the tank and at least partially contact or partially fit with the front bottom structure, so that in the second detection stage, the pressurizing device applies the internal pressure of the tank to a second predetermined pressure and maintains it for a second predetermined time;

[0008] The first predetermined pressure is the detection pressure at which the front tank bottom structure meets the design requirements, the second predetermined pressure is the detection pressure at which the rear tank bottom structure meets the design requirements, and the second predetermined pressure is greater than the first predetermined pressure.

[0009] In a possible implementation, the load-bearing tooling has a receiving cavity for receiving the front box bottom structure;

[0010] In the second testing phase, the load-bearing tooling is wrapped around the outer surface of the front box bottom structure.

[0011] In a possible implementation, a tightening structure is provided in the middle of the load-bearing tooling;

[0012] In the second detection stage, the tightening structure is tightened against the flange in the middle of the front box bottom structure.

[0013] In a possible implementation, the outer periphery of the load-bearing tooling has a circle of first connection structures;

[0014] In the second detection stage, the first connection structure is detachably fixedly connected to a circle of second connection structures located at the outer periphery of the front box bottom structure.

[0015] In a possible implementation, the first connection structure is provided with a plurality of first connection holes distributed at intervals, and the first connection holes and the second connection holes of the second connection structure are used for fixed connection through bolts and nuts; or,

[0016] The first connection structure is provided with a plurality of first threaded holes distributed at intervals, and the first threaded holes and the second connection holes of the second connection structure are used for fixed connection by screws.

[0017] In a possible implementation, the detection system further includes:

[0018] At least one first stress detector, arranged on the inner surface or outer surface of the front box bottom structure; and / or,

[0019] At least one second stress detector is used to be arranged on the inner surface or the outer surface of the rear box bottom structure.

[0020] In a second aspect, an embodiment of the present application provides a detection method, which is applied to the detection system of the first aspect, including:

[0021] In the first detection stage, the pressurizing device is connected to the inlet of the tank, and the pressure in the tank is applied to a first predetermined pressure through the pressurizing device and maintained for a first predetermined time;

[0022] In the second testing stage, the load-bearing fixture is fixedly connected to the front tank bottom structure, and the internal pressure of the tank is applied to a second predetermined pressure by a pressurizing device and maintained for a second predetermined time.

[0023] In a possible implementation, in the first detection stage, the following is further included:

[0024] At least one first stress detector is arranged on the inner surface or the outer surface of the front tank bottom structure of the tank;

[0025] Detecting stress changes of the front box bottom structure by a first stress detector; and / or,

[0026] The second phase of testing also includes:

[0027] At least one second stress detector is arranged on the inner surface or the outer surface of the rear tank bottom structure of the tank;

[0028] The stress change of the rear box bottom structure is detected by the second stress detector.

[0029] In a third aspect, an embodiment of the present application provides a launch vehicle, comprising: a tank inspected and accepted by the inspection method of the first aspect;

[0030] The storage tank comprises a front tank bottom structure, a tank body and a rear tank bottom structure which are fixedly connected in sequence.

[0031] In a possible implementation, the thickness of the front box bottom structure is smaller than the thickness of the rear box bottom structure.

[0032] The beneficial technical effects brought about by the technical solution provided by the embodiment of the present application include:

[0033] In the embodiment of the present application, the front tank bottom structure and the rear tank bottom structure of the tank can be tested respectively by means of a pressurizing device and a load-bearing tool. In the first testing stage, the pressure in the tank is applied to the first predetermined pressure and maintained for the first predetermined time by the pressurizing device, so as to complete the pressure test on the front tank bottom structure. In the second testing stage, the load-bearing tool is fixedly connected to the front tank bottom structure of the tank, so that the pressure that the connected load-bearing tool and the front tank bottom structure can bear together increases. The pressurizing device applies the internal pressure of the tank to the second predetermined pressure and maintains for the second predetermined time, so as to complete the pressure test on the rear tank bottom structure.

[0034] The embodiment of the present application can perform pressure detection on the front box bottom structure and the rear box bottom structure respectively according to the different pressure loads that the front box bottom structure and the rear box bottom structure need to bear in actual applications, so as to ensure the accuracy of the pressure detection of the tank. At the same time, based on the embodiment of the present application, the pressure detection of the front box bottom structure and the rear box bottom structure can be realized, so that in the early structural design of the tank, the front box bottom structure can be designed according to the pressure load that it actually needs to bear, for example: the thickness of the front box bottom structure can be reduced, so as to reduce the weight of the launch vehicle as a whole, save the use of propellant, and improve the carrying capacity.

[0035] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0037] Figure 1 A schematic diagram of the structure of a storage tank provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of a detection system provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a load-bearing tooling provided in an embodiment of the present application;

[0040] Figure 4 A structural schematic diagram of a load-bearing tool provided in an embodiment of the present application for being fixedly connected to a front box bottom structure;

[0041] Figure 5 A schematic diagram of a structure in which a first stress detector and a second stress detector are arranged in a storage tank provided in an embodiment of the present application;

[0042] Figure 6 A flow chart of a detection method provided in an embodiment of the present application.

[0043] Reference numerals:

[0044] 10-Detection system;

[0045] 110- pressurizing device;

[0046] 120-carrying tooling, 121-accommodating cavity, 122-tightening structure, 123-first connecting structure;

[0047] 130-a first stress detector;

[0048] 140 - a second stress detector;

[0049] 20 - storage tank, 210 - front tank bottom structure, 220 - tank body, 230 - rear tank bottom structure, 240 - second connecting structure. DETAILED DESCRIPTION

[0050] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0051] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0052] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0053] In the related art, the propellant tank of a liquid rocket is the main component of the liquid rocket, and the tank is generally composed of a front tank bottom structure, a box body, a rear tank bottom structure, etc. The liquid rocket engine is generally located at the rear bottom of the tank, and the tank transports propellant to the engine through a delivery pipeline.

[0054] During the actual flight of the tank, the "front and back" of the front and rear box bottom structures are determined according to the actual flight direction of the rocket. During flight, the front box bottom structure is subjected to less pressure, while the rear box bottom structure is subjected to greater pressure. If it is designed completely according to the flight state, the wall thickness of the rear box bottom structure can be larger and thicker. Compared with the wall thickness of the rear box bottom structure, the wall thickness of the front box bottom structure can be smaller and thinner.

[0055] At present, only a unified pressure load can be used for product acceptance of propellant tanks, which results in the pressure acceptance value of the rear tank bottom structure being loaded during loading, which in turn results in the loading pressure of the front tank bottom structure being higher than the actual acceptance pressure load during ground acceptance. At the same time, in order to ensure the safety of ground acceptance, the front tank bottom structure and the rear tank bottom structure are designed to have the same wall thickness.

[0056] Due to ground product acceptance reasons, the thickness of the propellant tank front bottom structure is thicker than the actual thickness required for flight. Therefore, some thickness in the front bottom structure is redundant. Obviously, it is not worth it for the launch vehicle to fly with useless mass.

[0057] The present application provides a detection system, a detection method and a launch vehicle, which are intended to solve the above-mentioned technical problems of the prior art.

[0058] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0059] See also Figure 1 As shown, the present application embodiment provides a schematic structural diagram of a storage tank 20. Figure 1 As shown, the tank 20 includes a front tank bottom structure 210, a tank body 220 and a rear tank bottom structure 230 which are fixedly connected in sequence. Figure 1 It is a structural schematic diagram of the tank 20, mainly showing the front tank bottom structure 210, the tank body 220 and the rear tank bottom structure 230 of the tank 20, the structure of the connection between the front tank bottom structure 210 and the tank body 220 is not shown, and the structure of the connection between the rear tank bottom structure 230 and the tank body 220 is not shown.

[0060] The front box bottom structure 210 can be fixedly connected to the box body 220 through a connecting component, and the rear box bottom structure 230 can also be fixedly connected to the box body 220 through a connecting component. For example, the front box bottom structure 210 can be fixedly connected to the box body 220 through a front short shell, and the rear box bottom structure 230 can be fixedly connected to the box body 220 through a rear short shell. The front box bottom structure 210 and the rear box bottom structure 230 can also be fixedly connected to the box body 220 directly through the connecting structures arranged thereon.

[0061] See also Figure 2 As shown, the present invention provides a schematic diagram of the structure of a detection system 10. The detection system 10 includes: a pressurizing device 110 and a load-bearing tool 120.

[0062] The pressurizing device 110 is used to be connected to the inlet of the tank 20 in the first detection stage, and to apply the pressure in the tank 20 to a first predetermined pressure and maintain it for a first predetermined time.

[0063] The support fixture 120 is used to be fixedly connected to the front box bottom structure 210 of the tank 20 and at least partially contact or partially fit with the front box bottom structure 210, so that in the second detection stage, the pressurizing device 110 applies the internal pressure of the tank 20 to a second predetermined pressure and maintains it for a second predetermined time.

[0064] The first predetermined pressure is the detection pressure at which the front box bottom structure 210 meets the design requirements, and the second predetermined pressure is the detection pressure at which the rear box bottom structure 230 of the tank 20 meets the design requirements. The second predetermined pressure is greater than the first predetermined pressure.

[0065] Optionally, the first predetermined pressure is used for inspection and acceptance of the front box bottom structure 210 . The first predetermined pressure is a test pressure that meets design requirements and is determined in advance and set on the pressurizing device 110 .

[0066] Optionally, the second predetermined pressure is used for inspection and acceptance of the rear box bottom structure 230 . The second predetermined pressure is a test pressure that meets design requirements and is also determined in advance and set on the pressurizing device 110 .

[0067] Optionally, the first predetermined time and the second predetermined time may be the same or different, and the specific time is determined according to the requirements of the storage tank 20 in actual application.

[0068] Optionally, the front box bottom structure 210 can withstand the first predetermined pressure applied by the pressurizing device 110 and maintain the first predetermined time, indicating that the front box bottom structure 210 has passed the inspection and acceptance. The rear box bottom structure 230 can withstand the second predetermined pressure applied by the pressurizing device 110 and maintain the second predetermined time, indicating that the rear box bottom structure 230 has passed the inspection and acceptance.

[0069] The detection system 10 of the embodiment of the present application can detect the front box bottom structure 210 and the rear box bottom structure 230 of the tank 20 respectively through the pressurizing device 110 and the bearing fixture 120. In the first detection stage, the pressure in the tank 20 is applied to the first predetermined pressure and maintained for the first predetermined time by the pressurizing device 110, and the pressure detection of the front box bottom structure 210 is completed. In the second detection stage, the bearing fixture 120 is fixedly connected to the front box bottom structure 210 of the tank 20, so that the pressure that the front box bottom structure 210 can bear increases, and the pressurizing device 110 applies the internal pressure of the tank 20 to the second predetermined pressure and maintains it for the second predetermined time, and the pressure detection of the rear box bottom structure 230 is completed.

[0070] The detection system 10 of the embodiment of the present application can perform pressure detection on the front box bottom structure 210 and the rear box bottom structure 230 respectively according to the different pressure loads that the front box bottom structure 210 and the rear box bottom structure 230 need to bear in actual applications, so as to ensure the accuracy of the pressure detection of the tank 20. At the same time, the detection system 10 based on the embodiment of the present application can realize the pressure detection of the front box bottom structure 210 and the rear box bottom structure 230, so that in the early structural design of the tank 20, the front box bottom structure 210 can be designed according to the pressure load that it actually needs to bear, for example: the thickness of the front box bottom structure 210 can be reduced, so as to reduce the weight of the launch vehicle as a whole, save the use of propellant, and improve the carrying capacity.

[0071] See also Figure 3 As shown, the present application embodiment provides a structural schematic diagram of a load-bearing tool 120. Figure 3As shown, the carrying tool 120 has a receiving cavity 121 for receiving the front box bottom structure 210. In the second detection stage, the carrying tool 120 is covered on the outer surface of the front box bottom structure 210.

[0072] Optionally, the front box bottom structure 210 is located in the accommodating cavity 121 of the supporting tooling 120, so that the pressure that the front box bottom structure 210 can bear becomes larger, so that in the second detection stage, the pressurizing device 110 can withstand the internal pressure of the tank 20 applied to the second predetermined pressure and maintained for a second predetermined time, thereby ensuring that when the tank 20 meets the overall pressure detection requirements, the structural strength of the front box bottom structure 210 can be weaker than the structural strength of the rear box bottom structure 230, and the front box bottom structure 210 can be made thinner than the rear box bottom structure 230.

[0073] Combination Figure 2 and Figure 3 As shown, a tightening structure 122 is provided in the middle of the load-bearing tool 120. In the second detection stage, the tightening structure 122 is tightened against the flange in the middle of the front box bottom structure 210.

[0074] Optionally, the tightening structure 122 matches the flange in the middle of the front box bottom structure 210 . The tightening structure 122 and the flange can further increase the pressure that the front box bottom structure 210 can withstand.

[0075] See also Figure 3 As shown, the outer periphery of the carrying tool 120 has a circle of first connection structures 123. In the second detection stage, the first connection structure 123 is detachably fixedly connected to a circle of second connection structures 240 located on the outer periphery of the front box bottom structure 210.

[0076] Optionally, the second connection structure 240 may be a circle connection structure on the outer periphery of the front box bottom structure 210, or may be an annular connection structure of the front head, and the front box bottom structure 210 is fixedly connected to the box body 220 via the front head.

[0077] See also Figure 4 As shown, the present application embodiment provides a structural schematic diagram of a load-bearing tool 120 for being fixedly connected to a front box bottom structure 210. Figure 4 As shown, an annular second connection structure 240 is provided on the box body 220 . The second connection structure 240 is arranged around the outer periphery of the front box bottom structure 210 . The front box bottom structure 210 can be fixedly connected to the box body 220 through the second connection structure 240 .

[0078] In the embodiment of the present application, the first connecting structure 123 and the second connecting structure 240 are detachably fixedly connected so that the load-bearing tooling 120 and the front box bottom structure 210 are fixedly connected, thereby increasing the pressure that the front box bottom structure 210 can withstand.

[0079] In some embodiments, the first connection structure 123 is provided with a plurality of first connection holes distributed at intervals, and the first connection holes and the second connection holes of the second connection structure 240 are used for fixed connection by bolts and nuts. Alternatively, the first connection structure 123 is provided with a plurality of first threaded holes distributed at intervals, and the first threaded holes and the second connection holes of the second connection structure 240 are used for fixed connection by screws.

[0080] In practical applications, other detachable connection methods may be selected as needed to fixedly connect the load-bearing tooling 120 to the front box bottom structure 210 .

[0081] When the detection system 10 of the embodiment of the present application is conducting a ground acceptance test on the tank 20, internal pressure is applied to the tank 20, and the auxiliary bearing tooling 120 and the front tank bottom structure 210 form a double-layer shell structure, which can reduce the force on the front tank bottom structure 210, so that when the pressure load of the rear tank bottom structure 230 is applied, the front tank bottom structure 210 still has sufficient strength, thereby achieving pressure detection of the front tank bottom structure 210 and the rear tank bottom structure 230 respectively, and ensuring the accuracy of the pressure detection of the tank 20.

[0082] See also Figure 5 As shown, the embodiment of the present application provides a structural schematic diagram of a first stress detector 130 and a second stress detector 140 disposed in a storage tank 20. Figure 5 As shown, a first stress detector 130 is provided on the inner surface of the front bottom structure 210, and a second stress detector 140 is provided on the inner surface of the rear bottom structure 230. In practical applications, at least two first stress detectors 130 or at least two second stress detectors 140 may also be provided.

[0083] In some embodiments, the detection system 10 further includes: at least one first stress detector 130. The first stress detector 130 is used to be arranged on the inner surface or outer surface of the front box bottom structure 210. And / or, the detection system 10 further includes at least one second stress detector 140. The second stress detector 140 is used to be arranged on the inner surface or outer surface of the rear box bottom structure 230.

[0084] Optionally, the first stress detector 130 and the second stress detector 140 may be strain gauges or stress sensors. In practical applications, detection points may be increased to ensure detection accuracy.

[0085] As an example, the first stress detector 130 can be attached to the inner surface of the front box bottom structure 210. When the front box bottom structure 210 is subjected to pressure, the first stress detector 130 changes with the deformation of the front box bottom structure 210, which is equivalent to an externally applied force. The first stress detector 130 will proportionally amplify the change of the externally applied force, measure the electrical output signal, and then convert the signal into an accurate force measurement value, thereby detecting whether the front box bottom structure 210 can withstand the first predetermined pressure, thereby determining whether the front box bottom structure 210 has passed the acceptance. Similarly, the application principle of the second stress detector 140 is the same.

[0086] The first stress detector 130 and the second stress detector 140 of the embodiment of the present application can select existing stress detection devices used for inspection and acceptance of the front box bottom structure 210 and the rear box bottom structure 230 .

[0087] The detection system 10 of the embodiment of the present application is designed with a bearing fixture 120 to ensure that the tightening structure 122 in the middle of the auxiliary bearing fixture 120 is tightened with the flange in the middle of the front box bottom structure 210, and the first connection structure 123 of the auxiliary bearing fixture 120 can be connected with the outer ring connection screw hole of the front head. The detection system 10 of the embodiment of the present application adopts an auxiliary bearing fixture 120, which can avoid the design problem of thickening the front box bottom structure 210 caused by the ground acceptance test of the tank 20, thereby achieving the purpose of reducing the weight of the tank 20 and improving the carrying capacity at the design stage.

[0088] See also Figure 6 As shown, the present application embodiment provides a flow chart of a detection method. Figure 6 As shown, the detection method is applied to the detection system 10 of the embodiment of the present application, including: step S601 to step S602.

[0089] S601. In a first detection stage, the pressurizing device 110 is connected to the inlet of the tank 20, and the pressure in the tank 20 is applied to a first predetermined pressure through the pressurizing device 110 and maintained for a first predetermined time.

[0090] S602, in the second detection stage, the load-bearing fixture 120 is fixedly connected to the front box bottom structure 210, and the internal pressure of the tank 20 is applied to a second predetermined pressure by the pressurizing device 110 and maintained for a second predetermined time.

[0091] In some embodiments, in the first detection stage, the method further includes: setting at least one first stress detector 130 on the inner surface or outer surface of the front box bottom structure 210 of the tank 20; and detecting the stress change of the front box bottom structure 210 by the first stress detector 130. And / or,

[0092] The second detection stage also includes: setting at least one second stress detector 140 on the inner surface or outer surface of the rear box bottom structure 230 of the tank 20; and detecting the stress change of the rear box bottom structure 230 by the second stress detector 140.

[0093] In actual application, there is an auxiliary load-bearing fixture 120, but due to uncertain reasons such as the connection gap, it is impossible to ensure that the front box bottom structure 210 is subjected to the same force each time the tank 20 is accepted and tested. Therefore, the detection of the embodiment of the present application is implemented in two steps. First, the auxiliary load-bearing fixture 120 is not installed, and the internal pressure of the tank 20 is applied to the front box bottom structure 210 for acceptance pressure load, maintained for a specified time, and then the pressure is unloaded to the local atmospheric pressure. The second step is to install the auxiliary load-bearing fixture 120, and the internal pressure of the tank 20 is applied to the rear box bottom structure 230 for acceptance pressure load, maintained for a specified time, and then the pressure is unloaded to the local atmospheric pressure, and the auxiliary load-bearing fixture 120 is removed for inspection, and the acceptance test is completed.

[0094] The detection method of the embodiment of the present application can detect the front box bottom structure 210 and the rear box bottom structure 230 of the tank 20 respectively through the pressurizing device 110 and the load-bearing tool 120. In the first detection stage, the pressure in the tank 20 is applied to the first predetermined pressure and maintained for the first predetermined time by the pressurizing device 110, and the pressure detection of the front box bottom structure 210 is completed. In the second detection stage, the load-bearing tool 120 is fixedly connected to the front box bottom structure 210 of the tank 20, so that the pressure that the front box bottom structure 210 can bear increases, and the pressurizing device 110 applies the internal pressure of the tank 20 to the second predetermined pressure and maintains it for the second predetermined time, and the pressure detection of the rear box bottom structure 230 is completed.

[0095] The detection method of the embodiment of the present application is applied to the detection system 10 of the embodiment of the present application. The detection method of the embodiment of the present application can perform pressure detection on the front box bottom structure 210 and the rear box bottom structure 230 respectively according to the different pressure loads that the front box bottom structure 210 and the rear box bottom structure 230 need to bear in actual applications, so as to ensure the accuracy of the pressure detection of the tank 20. At the same time, based on the detection method of the embodiment of the present application, the pressure detection of the front box bottom structure 210 and the rear box bottom structure 230 can be realized, so that in the early structural design of the tank 20, the front box bottom structure 210 can be designed according to the pressure load that it actually needs to bear, for example: the thickness of the front box bottom structure 210 can be reduced, so as to reduce the weight of the launch vehicle as a whole, save the use of propellant, and improve the carrying capacity.

[0096] Based on the same inventive concept, an embodiment of the present application provides a launch vehicle, including: a tank 20 inspected and accepted using the inspection method of the embodiment of the present application.

[0097] Combination Figure 1As shown, the tank 20 includes a front tank bottom structure 210, a tank body 220 and a rear tank bottom structure 230 which are fixedly connected in sequence.

[0098] The tank 20 of the embodiment of the present application is a conventional tank 20 structure in a launch vehicle, and other specific related structures are as follows: Figure 1 Not shown.

[0099] In some embodiments, the thickness of the front box bottom structure 210 is less than the thickness of the rear box bottom structure 230 .

[0100] Since the front box bottom structure 210 of the embodiment of the present application is designed according to the actual pressure load that needs to be borne, the load that the front box bottom structure 210 needs to bear is smaller than that of the rear box bottom structure 230, so the thickness of the front box bottom structure 210 can be smaller than the thickness of the rear box bottom structure 230, which can reduce the weight of the launch vehicle as a whole, save the use of propellant, and improve the carrying capacity.

[0101] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0102] (1) The embodiment of the present application can perform pressure detection on the front box bottom structure 210 and the rear box bottom structure 230 respectively according to the different pressure loads that the front box bottom structure 210 and the rear box bottom structure 230 need to bear in actual applications, thereby ensuring the accuracy of the pressure detection of the tank 20. At the same time, the detection system 10 based on the embodiment of the present application can realize pressure detection of the front box bottom structure 210 and the rear box bottom structure 230, so that in the early structural design of the tank 20, the front box bottom structure 210 can be designed according to the pressure load that it actually needs to bear. For example, the thickness of the front box bottom structure 210 can be reduced, thereby reducing the weight of the launch vehicle as a whole, saving the use of propellant, and improving the carrying capacity.

[0103] (2) When the detection system 10 of the embodiment of the present application is conducting a ground acceptance test on the tank 20, internal pressure is applied to the tank 20, and the auxiliary load-bearing tooling 120 and the front tank bottom structure 210 form a double-layer shell structure, which can reduce the force on the front tank bottom structure 210, so that when the pressure load of the rear tank bottom structure 230 is applied, the front tank bottom structure 210 still has sufficient strength, thereby achieving pressure detection of the front tank bottom structure 210 and the rear tank bottom structure 230 respectively, and ensuring the accuracy of the pressure detection of the tank 20

[0104] (3) The embodiment of the present application adopts an auxiliary load-bearing tooling 120, which can avoid the design problem of thickening the front tank bottom structure 210 caused by the ground acceptance test of the tank 20, thereby achieving the purpose of reducing the weight of the tank 20 and improving the carrying capacity at the design stage.

[0105] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, altered, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

[0106] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0107] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0108] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0109] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0110] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0111] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A detection system, characterized in that: include: A pressurizing device, used to be connected to the inlet of the tank in the first detection stage, to apply the pressure in the tank to a first predetermined pressure and maintain it for a first predetermined time; a load-bearing tool, which is used to be fixedly connected to the front bottom structure of the tank and at least partially contact or partially fit with the front bottom structure, so that in the second detection stage, the pressurizing device applies the internal pressure of the tank to a second predetermined pressure and maintains it for a second predetermined time; The first predetermined pressure is the detection pressure at which the front box bottom structure meets the design requirements, the second predetermined pressure is the detection pressure at which the rear box bottom structure of the tank meets the design requirements, and the second predetermined pressure is greater than the first predetermined pressure.

2. The detection system according to claim 1, characterized in that: The load-bearing tooling has a receiving cavity for receiving the front box bottom structure; In the second detection stage, the load-bearing tooling is covered on the outer surface of the front box bottom structure.

3. The detection system according to claim 1, characterized in that: A tightening structure is provided in the middle of the load-bearing tooling; In the second detection stage, the tightening structure is tightened against the flange in the middle of the front box bottom structure.

4. The detection system according to claim 1, characterized in that: The outer periphery of the load-bearing tooling has a circle of first connecting structure; In the second detection stage, the first connection structure is detachably fixedly connected to a circle of second connection structures located on the outer periphery of the front box bottom structure.

5. The detection system according to claim 4, characterized in that: The first connection structure is provided with a plurality of first connection holes distributed at intervals, and the first connection holes and the second connection holes of the second connection structure are used for fixed connection through bolts and nuts; or, The first connection structure is provided with a plurality of first threaded holes distributed at intervals, and the first threaded holes and the second connection holes of the second connection structure are used for fixed connection by screws.

6. The detection system according to claim 1, characterized in that: Also includes: At least one first stress detector, used to be arranged on the inner surface or outer surface of the front box bottom structure; and / or, At least one second stress detector is used to be arranged on the inner surface or the outer surface of the rear box bottom structure.

7. A detection method, characterized in that: A detection system as claimed in any one of claims 1 to 6, comprising: In the first detection stage, a pressurizing device is connected to the inlet of the tank, and the pressure in the tank is applied to a first predetermined pressure by the pressurizing device and maintained for a first predetermined time; In the second detection stage, the load-bearing fixture is fixedly connected to the front box bottom structure, and the internal pressure of the tank is applied to a second predetermined pressure by the pressurizing device and maintained for a second predetermined time.

8. The detection method according to claim 7, characterized in that: In the first detection stage, it also includes: At least one first stress detector is arranged on the inner surface or the outer surface of the front tank bottom structure of the tank; Detecting the stress change of the front box bottom structure by using the first stress detector; and / or, In the second detection stage, it also includes: At least one second stress detector is arranged on the inner surface or the outer surface of the rear bottom structure of the tank; The stress change of the rear box bottom structure is detected by the second stress detector.

9. A launch vehicle, characterized in that: include: The storage tank to be inspected and accepted is inspected using the inspection method described in any one of claims 7 to 8; The storage tank comprises a front tank bottom structure, a tank body and a rear tank bottom structure which are fixedly connected in sequence.

10. The launch vehicle according to claim 9, characterized in that: The thickness of the front box bottom structure is smaller than the thickness of the rear box bottom structure.

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