Adaptive bidirectional filtration device for pressure relief valve buffer gas in liquid rocket engines

Abstract

An adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine, belonging to the field of mechanical technology, includes two parallel pathways with opposite directions. Each pathway includes: an internal flow channel within the housing, with positioning, sealing, and limiting structures and connecting threads; a pressure cap flange fastened to one end of the housing by fastening screws; a flow-directing core located within the housing cavity; two ends of a spring pressing against the inner wall of the housing and the flow-directing core respectively, realizing the axial movement function of the flow-directing core; a filter element located within the housing cavity, with a through hole in its body and a filter screen attached to its surface; a media flow gap between the filter element and the inner wall of the housing; the large end of the filter element connected to the inner wall of the housing via its circumferential external thread; an interface nut connected to the housing via its internal thread; the interface nut having an external threaded interface, realizing the bidirectional filtration function of the gas storage buffer container, preventing foreign matter, simplifying the process flow, and improving experimental efficiency.

Description

Technical Field

[0001] This invention relates to an adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine, belonging to the field of mechanical technology. Background Technology

[0002] The helium screening test of the pressure-reducing valve in a liquid rocket engine simulates actual launch timing and operating conditions to evaluate and assess the valve's pressure-stabilizing performance and process consistency, providing data assurance for actual launches. The pressure-reducing valve's flow channel is sensitive to foreign matter, making foreign matter protection in the helium screening test extremely important. The test buffer container ensures constant pressure and sufficient gas volume during the test, and its connecting pipeline allows for bidirectional flow. Solving the foreign matter control problem under bidirectional flow conditions becomes a crucial test requirement.

[0003] The helium pressure reducing valve is a crucial pressure-stabilizing component in the control gas circuit of a rocket engine. Its pressure-stabilizing performance directly affects the supply of all control gases to the entire engine, thus influencing engine ignition and rocket launch. Mass production and batch testing of the pressure reducing valve can be significantly improved by simplifying the process flow through the design of an adaptive bidirectional filtration device.

[0004] like Figure 1 , 2 During helium screening tests on pressure-reducing valves, a large-capacity gas storage buffer container is required to achieve stable pressure and sufficient gas volume. As a standard gas cylinder device for gas storage buffer containers, it is pressurized by filling it with gas through its interface and piping system during test preparation. During the test, gas is supplied to the product through the same interface and piping system. Traditional filters are unidirectional filters, only capable of unidirectional filtration. When the test gas is supplied in reverse, it will carry away substances that were originally filtered out, and may even damage the filter itself, turning it into unwanted material. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide an adaptive bidirectional filtration device for the buffer gas of the pressure reducing valve of a liquid rocket engine, so as to realize the bidirectional filtration function of the gas storage buffer container, prevent foreign matter, simplify the process flow, and improve the test efficiency.

[0006] The technical solution of this invention is: an adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine, comprising two parallel pathways in opposite directions; each pathway includes a fastening screw, a pressure flange, a housing, a flow-directing core, a spring, a filter element, and an interface nut; the housing has an internal flow channel, and provides positioning, sealing, and limiting structures and connecting threads; the pressure flange is fastened to one end of the housing by a fastening screw; the flow-directing core is located in the inner cavity of the housing; the two ends of the spring respectively press against the inner wall of the housing and the flow-directing core, realizing the axial movement function of the flow-directing core; the filter element is located in the inner cavity of the housing, its body has a through hole, and a filter screen is attached to its surface; a medium flow gap is left between the filter element and the inner wall of the housing; the large end of the filter element is connected to the inner wall of the housing through its circumferential external thread; the interface nut is connected to the housing through its internal thread; the interface nut has an external threaded interface.

[0007] Furthermore, the gland flange and the housing achieve external leakage sealing through the first sealing gasket; the gland flange and the housing achieve internal circulation sealing through the second sealing gasket; the filter element is sealed to the housing through the third sealing gasket; and the interface nut is sealed to the other end of the housing through the fourth sealing gasket.

[0008] Furthermore, the flow-direction top core is sealed with a third sealing gasket by fastening screws.

[0009] Furthermore, the gland flange, third gasket, flow-directing core, spring, and housing form an adaptive unidirectional flow function.

[0010] Furthermore, the end face of the large end of the filter element has a cross groove, which is used to cooperate with the tightening wrench used during the limit installation.

[0011] Furthermore, the flow holes in the filter element and the flow gap between it and the housing are modified according to the actual flow requirements.

[0012] Furthermore, the filter screen attached to the outer surface of the filter element is changed according to the actual filtration accuracy.

[0013] Furthermore, the flow-directing top core, spring, and filter element are arranged coaxially.

[0014] Furthermore, the cross-sectional area or equivalent cross-sectional area of ​​the flow channels of each component are matched with each other and are not less than the system piping.

[0015] Furthermore, arranged between the system pipeline and the buffer gas cylinder, the medium flows through the interface nut, the gland flange, the top core, the filter element, the interface nut, and the channels and gaps in various parts of the shell in sequence to achieve the flow and filtration of the medium.

[0016] The advantages of this invention compared to the prior art are:

[0017] The adaptive bidirectional filtration device is installed between the pressurization pipeline and the gas storage buffer cylinder. Through its adaptive reversing function, it achieves filtration in both the pressurization and storage and test gas supply stages, preventing impurities from entering downstream processes and the product. Its adaptive reversing function simplifies manual reversing, reduces accidental risks, and significantly improves batch testing efficiency. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 Schematic diagram for medium supply;

[0020] Figure 2 This is a schematic diagram of the principle of a one-way filter;

[0021] Figure 3 This is a schematic diagram of the external structure of the adaptive bidirectional filtration device of the present invention;

[0022] Figure 4 This is a schematic diagram of the adaptive bidirectional filtering device of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the adaptive bidirectional filtering device of the present invention. Detailed Implementation

[0024] To better understand the above technical solutions, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0025] The following description, in conjunction with the accompanying drawings, provides a more detailed explanation of an adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine, as provided in the embodiments of this application. Specific implementation methods may include (e.g.) Figures 3-5 (As shown): It consists of two paired flow control and filtration sections, mainly including interface nuts, filter elements, springs, flow control top cores, gland flanges, housings, fasteners, and seals, etc., as illustrated in the diagram. Figure 2 As shown.

[0026] (1) The shell, interface nut and gland flange form a parallel flow channel to realize the flow of the medium;

[0027] (2) The pressure flange, spring and flow direction top core form the flow direction control part to realize the adaptive flow direction control of the medium;

[0028] (3) The filter element is the main filtration part, which realizes the filtration function of the medium;

[0029] (4) The flow control section and the filtration section are connected in series to achieve unidirectional filtration function;

[0030] (5) The two sets of unidirectional filter structures are connected in parallel to realize bidirectional adaptive filtration function.

[0031] The solution provided in this application includes two parallel pathways with opposite directions. Each pathway includes a fastening screw 1, a pressure flange 2, a housing 4, a flow-directing core 7, a spring 8, a filter element 10, and an interface nut 12. The housing 4 has an internal flow channel, and provides positioning, sealing, limiting structures, and connecting threads. The pressure flange 2 is fastened to one end of the housing 4 by the fastening screw 1. The flow-directing core 7 is located in the inner cavity of the housing 4. The two ends of the spring 8 press against the inner wall of the housing 4 and the flow-directing core 7 respectively, realizing the axial movement function of the flow-directing core 7. The filter element 10 is located in the inner cavity of the housing 4, and its body has a through hole and a filter screen is attached to its surface. A medium flow gap is left between the filter element 10 and the inner wall of the housing 4. The large end of the filter element 10 is connected to the inner wall of the housing 4 through its circumferential external thread. The interface nut 12 is connected to the housing 4 through its internal thread. The interface nut 12 has an external threaded interface.

[0032] The gland flange 2 and the housing 4 achieve external leakage sealing through the first sealing gasket 3; the gland flange 2 and the housing 4 achieve internal circulation sealing through the second sealing gasket 5; the filter element 10 is sealed to the housing 4 through the third sealing gasket 9; the interface nut 12 is sealed to the other end of the housing 4 through the fourth sealing gasket 11. The flow-directing core 7 is sealed to the third sealing gasket 6 through the fastening screw 1. The gland flange 2, the third sealing gasket 6, the flow-directing core 7, the spring 8, and the housing 4 form an adaptive unidirectional flow function. The end face of the large end of the filter element 10 has a cross groove to cooperate with the tightening wrench used for limit installation. The flow passage of the filter element 10 and the flow gap between it and the housing 4 are changed according to the actual flow requirements. The filter screen attached to the outer surface of the filter element 10 is changed according to the actual filtration accuracy. The flow-directing core 7, the spring 8, and the filter element 10 are coaxially arranged. The cross-sectional area or equivalent cross-sectional area of ​​the flow channels of each component is matched with each other and is not less than that of the system pipeline.

[0033] This invention is arranged between the system pipeline and the buffer gas cylinder. The medium passes through the channels and gaps of the interface nut 12, the pressure flange 2, the flow direction core 7, the filter element 10, the interface nut 12, and the shell 4 in sequence to realize the flow and filtration of the medium.

[0034] like Figure 3 As shown, its working mode is as follows: (1) The interface nut 6 is connected and tightened to the upstream and downstream pipelines respectively, and a line seal is formed through its conical surface; (2) The filter element 10 is tightened to the shell through threads; (3) The spring 8, the flow top core 7 and the pressure flange 2 are pressed together to form a unidirectional flow structure and channel; (4) Each part is connected in series to form a unidirectional flow filtration structure; (5) The two sets of structures are connected in parallel to form a bidirectional adaptive filtration capability.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0037] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. An adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine, characterized in that, It includes two parallel pathways in opposite directions; each pathway includes a fastening screw (1), a gland flange (2), a housing (4), a flow-directing core (7), a spring (8), a filter element (10), and an interface nut (12); the housing (4) has an internal flow channel, with positioning, sealing, limiting structures, and connecting threads; the gland flange (2) is fastened to one end of the housing (4) by a fastening screw (1); the flow-directing core (7) is located in the inner cavity of the housing (4); the two ends of the spring (8) press against the inner wall of the housing (4) and the flow-directing core (7) respectively. 7), to realize the axial movement function of the flow to the top core (7); the filter element (10) is located in the inner cavity of the housing (4), its body has a through hole, and the surface is attached with a filter screen; there is a medium flow gap between the filter element (10) and the inner wall of the housing (4); the large end of the filter element (10) is connected to the inner wall of the housing (4) through its circumferential external thread; the interface nut (12) is connected to the housing (4) through the internal thread; the interface nut (12) has an external threaded interface; the flow to the top core (7), the spring (8) and the filter element (10) are coaxially arranged; Each filter element (10) of the channel structure is fastened to the housing (4) by threads. The spring (8), the flow top core (7) and the cover flange (2) press against each other to form the flow control part, forming a unidirectional flow structure and channel to realize the adaptive flow control of the medium. The flow control part and the filter element (10) are connected in series to form a unidirectional flow filtration structure. The flow control parts of the two sets of paired unidirectional flow filtration structures are arranged in opposite directions and form a parallel relationship. The unidirectional flow directions of the two channel structures are opposite to achieve bidirectional filtration.

2. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, The gland flange (2) and the housing (4) are sealed against external leakage through the first sealing gasket (3); the gland flange (2) and the housing (4) are sealed against internal circulation through the second sealing gasket (5); the filter element (10) is sealed against the housing (4) through the third sealing gasket (9); and the interface nut (12) is sealed against the other end of the housing (4) through the fourth sealing gasket (11).

3. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, The filter element (10) has a cross groove on the end face of the large end, which is used to cooperate with the tightening wrench used during the limit installation.

4. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, The flow passage of the filter element (10) and the flow gap between it and the housing (4) are changed according to the actual flow requirements.

5. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, The filter screen attached to the outer surface of the filter element (10) is changed according to the actual filtration accuracy.

6. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, The cross-sectional area or equivalent cross-sectional area of ​​the flow channels of each component are matched with each other and are not less than the system piping.

7. The adaptive bidirectional filtration device for the buffer gas of a pressure reducing valve in a liquid rocket engine according to claim 1, characterized in that, Arranged between the system pipeline and the buffer gas cylinder, the medium flows through the interface nut (12) of one path structure and the pressure flange (2) of the other path structure, flows towards the top core (7), filter element (10), interface nut (12), and shell (4) in sequence, realizing the flow and filtration of the medium in one direction; when the medium flows and filters in the opposite direction, the medium flows through the interface nut (12) of the other path structure and the pressure flange (2) of the one path structure, flows towards the top core (7), filter element (10), interface nut (12), and shell (4) in sequence, realizing the flow and filtration of the medium in one direction; when the medium flows and filters in the opposite direction, the medium flows through the interface nut (12) of the other path structure and the pressure flange (2) of the one path structure, flows towards the top core (7), filter element (10), interface nut (12), and shell (4) in sequence, through the channels and gaps.

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