Low-temperature two-way flow synchronous regulator based on adjustable venturi

Abstract

The present application relates to a kind of low temperature two-way flow synchronous regulator based on adjustable venturi, comprising: base, venturi, plug cone, driving device and air replacement structure for plug cone deicing installed on base;On base, venturi, plug cone and driving device are sequentially arranged;Wherein, plug cone is slidably connected with base;Driving device is connected with plug cone, to control the flow area of venturi inlet by adjusting the position of plug cone relative to venturi;Driving device is integrated with displacement detection device for feedback its output displacement;Two venturis are arranged side by side, and plug cone is correspondingly arranged with venturi, to control the two-way flow of oxidant and fuel.The present application uses high-precision servo mechanism as driving device, and uses one-to-two adjustable cavitation venturi as flow regulating element, which can be used to realize two-way low-temperature oxidant and fuel side flow synchronous control.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, and in particular to a low-temperature dual-path flow synchronous regulator based on an adjustable Venturi tube. BACKGROUND

[0002] The adjustable cavitation Venturi tube has been widely used in variable-thrust liquid rocket engine supply systems due to its fast flow regulation response speed and high flow control precision. The working principle of the adjustable cavitation Venturi tube is to change the flow area of the Venturi tube by using a movable needle cone, thereby achieving flow control. In order to achieve simultaneous control of the flow of oxidizer and fuel, existing engine flow regulation and mixture ratio control schemes mainly include two technical forms:

[0003] The first type is to use two separate adjustable cavitation Venturi tubes to control the flow of oxidizer and fuel respectively. The adjustable cavitation Venturi tubes are driven by two independent servo mechanisms and are not mechanically connected to each other. The disadvantage of this method is that due to the differences in response time and working characteristics of the two driving controllers, the synchronization of the servo mechanisms on the oxidizer control side and the fuel control side is difficult to guarantee, especially the inconsistency of the start-up response characteristics and the stop response characteristics, which ultimately leads to a time difference in the flow regulation of the two paths, causing large fluctuations in the mixture ratio and affecting the stable and reliable operation of the engine.

[0004] The second type is to use a mechanically linked dual-path or multi-path Venturi tube. The needle cones of the oxidizer and fuel of the Venturi tube are connected in parallel, and a driving mechanism is used to drive them. The disadvantage of this method is that the connection method of the two needle cones has high rigidity, high coaxiality and parallelism requirements, and uneven mechanical load can easily cause the needle cones to be misaligned in front and back or the push rod to be deformed, thereby affecting the flow and mixture ratio range.

[0005] In addition to the above-mentioned disadvantages, existing flow regulation schemes can only control the flow of normal temperature propellants. The density and saturation vapor pressure of low-temperature propellants are greatly affected by temperature, pressure and other state parameters, and their flow is easily affected by state parameters. The control accuracy of the servo mechanism and the synchronization of the needle cone at low temperature are difficult to guarantee. In addition, the dynamic sealing of low-temperature media is strict, and long-term low-temperature work of the device can easily cause low-temperature icing, affecting the operation and sealing of the moving parts. SUMMARY

[0006] The purpose of the present application is to provide a low-temperature dual-path flow synchronous regulator based on an adjustable Venturi tube.

[0007] To achieve the above-mentioned purpose of the application, the present application provides a low-temperature dual-path flow synchronous regulator based on an adjustable Venturi tube, comprising: a base, a Venturi tube, a needle cone, a driving device and an air replacement structure for preventing icing of the needle cone mounted on the base;

[0008] The Venturi tube, the plug cone and the driving device are arranged in sequence on the base; wherein the plug cone is in sliding connection with the base;

[0009] The driving device is connected with the plug cone to control the flow area of the inlet of the Venturi tube by adjusting the position of the plug cone relative to the Venturi tube;

[0010] The driving device is integrated with displacement detection device for feeding back the output displacement thereof;

[0011] The Venturi tubes are arranged side by side in two, and the plug cones are arranged in one-to-one correspondence with the Venturi tubes for double-way flow control of oxidant and fuel.

[0012] According to an aspect of the present application, the base comprises a base body, a plug cone support and an end cover;

[0013] The base body is provided with a hollow liquid inlet cavity and a liquid inlet port in communication with the liquid inlet cavity;

[0014] The liquid inlet cavity penetrates through opposite ends of the base body;

[0015] The inlet end of the Venturi tube is connected with one end of the liquid inlet cavity, and the end cover is arranged at the other end of the liquid inlet cavity;

[0016] The plug cone support is arranged coaxially with the liquid inlet cavity in the liquid inlet cavity, and the plug cone support is arranged adjacent to the end cover;

[0017] The end cover is provided with a first plug cone through hole penetrating through the body thereof.

[0018] According to an aspect of the present application, the liquid inlet cavities are arranged in one-to-one correspondence with the Venturi tubes;

[0019] The liquid inlet port is arranged in an axial direction perpendicular to the axial direction of the liquid inlet cavity;

[0020] The two liquid inlet cavities are arranged symmetrically side by side on the base body, and the two liquid inlet ports are arranged symmetrically.

[0021] According to an aspect of the present application, the base further comprises a pressing member;

[0022] The inlet end of the Venturi tube extends into the liquid inlet cavity, and the inlet end of the Venturi tube and the liquid inlet cavity are arranged in mutual nesting;

[0023] A first positioning step is arranged in the liquid inlet cavity;

[0024] The pressing member is sleeved on the outside of the Venturi tube, and the pressing end of the pressing member is screwed with the end portion of the liquid inlet cavity;

[0025] The pressing end of the pressing member and the first positioning step are used to clamp and fix the inlet end of the venturi.

[0026] According to an aspect of the present application, the pressing member is a tubular structure, and an end of the pressing member away from the pressing end exceeds the outlet end of the venturi.

[0027] According to an aspect of the present application, the driving device comprises an output structure and a synchronization structure.

[0028] The synchronization structure comprises a fish-eye bearing and a connecting crossbar installed on the fish-eye bearing.

[0029] Along the length direction of the connecting crossbar, the opposite ends of the connecting crossbar are respectively connected with the fixed connection end of the plug.

[0030] According to an aspect of the present application, an adjusting gasket is selectively arranged between the connecting crossbar and the fixed connection end of the plug for adjusting the flow range and the mixing ratio of the two-way fluid; wherein, increasing the gasket thickness of the adjusting gasket reduces the corresponding side flow, reducing the gasket thickness of the adjusting gasket increases the corresponding side flow; and increasing the thickness of the adjusting gasket on the oxidant control side reduces the mixing ratio of the two-way fluid, and increasing the thickness of the adjusting gasket on the fuel control side increases the mixing ratio of the two-way fluid.

[0031] According to an aspect of the present application, the flow area of the venturi inlet and the displacement of the plug satisfy a linear relationship, and the linear relationship is expressed as:

[0032] A ax + b

[0033] Wherein, A represents the flow area of the venturi inlet, a and b are constants, x represents the displacement of the plug.

[0034] The adjusting gasket thickness increase value and the mixing ratio of the two-way fluid satisfy:

[0035] MR ( a 1( x +Δ L )+ b 1) / ( a 2 x + b 2)* k = a 1 / a 2+ a 1*Δ​L a 2 x

[0036] wherein, MR represents the double-path fluid mixing ratio, x represents the displacement of the plug cone, Δ L represents the adjustment gasket thickness increase value, a 1, b 1, a 2, b 2 are constants, wherein subscript 1 represents the oxidant control side, and subscript 2 represents the fuel control side, k represents a constant, which is obtained from the physical and state parameters of the oxidant and the fuel.

[0037] According to one aspect of the present application, the air replacement structure comprises: a gas conveying pipeline and a polytetrafluoroethylene corrugated pipe;

[0038] The polytetrafluoroethylene corrugated pipe is sleeved outside the plug cone;

[0039] One end of the polytetrafluoroethylene corrugated pipe is wrapped outside the end cover, and the polytetrafluoroethylene corrugated pipe is sealingly connected with the outside of the end cover;

[0040] The other end of the polytetrafluoroethylene corrugated pipe is wrapped outside the fixed connection end of the plug cone, and the polytetrafluoroethylene corrugated pipe is sealingly connected with the outside of the plug cone;

[0041] The end cover is provided with a first communication pipeline for communicating the gas conveying pipeline and the hollow part of the polytetrafluoroethylene corrugated pipe, wherein the inlet of the first communication pipeline is opened on the outer side surface of the end cover, and the outlet of the first communication pipeline is opened on the side of the end cover facing the polytetrafluoroethylene corrugated pipe;

[0042] The fixed connection end of the plug cone is provided with a second communication pipeline for communicating the hollow part of the polytetrafluoroethylene corrugated pipe and the outside, wherein the inlet of the second communication pipeline is opened on the outer side surface of the plug cone, and the outlet of the second communication pipeline is opened on the end surface away from the polytetrafluoroethylene corrugated pipe.

[0043] According to one aspect of the present application, the base further comprises: a fixed support;

[0044] One end of the fixed support is connected with the base body, and the other end of the fixed support is connected with the output structure;

[0045] A first sealing ring is arranged between the pressing end of the pressing piece and the venturi;

[0046] A second sealing ring is arranged between the end cover and the end part of the liquid inlet cavity. ​​

[0047] According to one aspect of the present invention, a high-precision servo mechanism is used as the driving device, and a one-to-two adjustable cavitation venturi tube is used as the flow regulating element. This can be used to realize synchronous control of dual-path cryogenic oxidizer and fuel side flow, realize wide-range adjustment of two-path cryogenic propellant flow, and achieve high-resolution flow regulation and high-precision control.

[0048] According to one aspect of the present invention, the present invention can achieve adjustment and control of flow range and mixing ratio by using the two-way throttling area and displacement linear design principle, as well as by adding adjustment shims. It can achieve both constant mixing ratio during the adjustment process and monotonically changing mixing ratio during the adjustment process.

[0049] According to one aspect of the present invention, by providing an air displacement structure at the plug cone and end cap, the present invention can effectively solve the problem of freezing failure of the regulating mechanism during the cryogenic propellant flow regulation process.

[0050] According to one aspect of the present invention, the present invention makes full use of the structure of the end cap and the plug cone, effectively reducing the number of parts used, greatly improving the utilization efficiency and integration between structures, and effectively reducing the production cost of the present invention. In this invention, the air replacement structure is designed to form the inlet and outlet of the gas replacement process by using the end cap and the plug cone, which can effectively achieve the corresponding replacement effect in the operating state, greatly ensuring the flexibility of the present invention in operation. It can achieve the function of real-time gas replacement, which is more beneficial to suppressing icing of the device. Attached Figure Description

[0051] Figure 1 This is a schematic diagram illustrating the structure of a low-temperature dual-path flow synchronization regulator according to an embodiment of the present invention;

[0052] Figure 2 This is a perspective view schematically illustrating a low-temperature dual-path flow synchronization regulator according to an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram showing the installation position of the regulating shim in a low-temperature dual-path flow synchronization regulator according to an embodiment of the present invention;

[0054] Figure 4 This is a partially enlarged view schematically illustrating a low-temperature dual-path flow synchronization regulator according to an embodiment of the present invention. Detailed Implementation

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0056] In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" express orientations or positional relationships based on the orientations or positional relationships shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0057] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0058] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a cryogenic dual-path flow synchronous regulator based on an adjustable venturi tube includes: a base 11, a venturi tube 12, a plug cone 13, a drive device 14, and an air displacement structure 16 for preventing and de-icing the plug cone 13, all mounted on the base 11. In this embodiment, the venturi tube 12 and the drive device 14 are detachably mounted on the base 11, thereby improving the flexibility of their assembly. In this embodiment, the venturi tube 12, the plug cone 13, and the drive device 14 are arranged sequentially on the base 11; wherein the plug cone 13 is slidably connected to the base 11; the drive device 14 is connected to the plug cone 13 to control the flow area of ​​the venturi tube 12 inlet by adjusting the position of the plug cone 13 relative to the venturi tube 12. In this embodiment, the displacement detection device 15 is integrated into the drive device 14 to provide feedback on its output displacement. The displacement detection device 15 can be a potentiometer, which uses the acquired electrical signal to accurately feedback the output displacement of the drive device 14, thereby achieving precise control of the drive displacement. In this embodiment, the position detection error of the displacement detection device 15 is less than 0.5%.

[0059] In this embodiment, two Venturi tubes 12 are arranged side by side, and the plug cones 13 are arranged in a one-to-one correspondence with the Venturi tubes 12. The combination of Venturi tubes 12 and plug cones 13 is used to achieve dual-path flow control of oxidant and fuel.

[0060] In this embodiment, the two Venturi tubes 12 have the same structure, and correspondingly, the two plug cones 13 have the same structure, so as to ensure the consistency of the two-way structure, thereby helping to ensure the synchronization accuracy of the dual-way control and making the working performance of the present invention better.

[0061] Combination Figure 1 , Figure 2 and Figure 4 As shown, according to one embodiment of the present invention, the base 11 includes: a base body 111, a plug cone support 112, and an end cap 113; wherein, the base body 111 is provided with a hollow liquid inlet cavity 111a and a liquid inlet port 111b communicating with the liquid inlet cavity 111a; in this embodiment, the liquid inlet cavity 111a extends through both opposite ends of the base body 111. In this embodiment, the inlet end of the Venturi tube 12 is connected to one end of the liquid inlet cavity 111a, and the end cap 113 is disposed at the other end of the liquid inlet cavity 111a; furthermore, the plug cone support 112 is coaxially disposed within the liquid inlet cavity 111a, and the plug cone support 112 and the end cap 113 are disposed adjacent to each other. In this embodiment, the plug cone support 112 is generally in the form of a circular ring structure, thereby, the plug cone support 112 can be coaxially nested with the liquid inlet cavity 111a. Furthermore, the hollow portion of the plug cone support 112 is matched with the equal-diameter portion of the plug cone 13 to ensure accurate axial sliding of the plug cone 13. Furthermore, the end of the liquid inlet chamber 111a connected to the end cap 113 can be radially narrowed, thereby forming a stepped structure in the liquid inlet chamber 111a. This allows the plug cone support 112 to be inserted at the radially narrowed position, enabling convenient and flexible installation of the plug cone support 112.

[0062] In this embodiment, to facilitate the accurate installation position of the plug cone support 112, an annular limiting boss 111a1 can be further provided at the position where the plug cone support 112 is installed in the liquid inlet chamber 111a. Thus, the installation position is accurately limited based on the abutment between the plug cone support 112 and the annular limiting boss 111a1.

[0063] In this embodiment, the end cap 113 is provided with a first plug cone through hole that penetrates its body, and the first plug cone through hole is arranged coaxially with the hollow part of the plug cone support 112. Thus, the plug cone 13 can easily pass through the first plug cone through hole to achieve a sliding connection with the plug cone support 112.

[0064] Combination Figure 1 , Figure 2 and Figure 4As shown, according to one embodiment of the present invention, a second sealing ring b is provided between the end cap 113 and the end of the liquid inlet chamber 111a. The second sealing ring b is disposed between the annular limiting boss 111a1 and the end cap 113 to achieve a dynamic seal between the plug cone 13 and the plug cone support 112 at their sliding positions, thereby preventing reverse overflow of fluid. In this embodiment, the second sealing ring b is a low-temperature resistant spring-loaded sealing ring, and the sealing ring is pressed by the end cap 113 to ensure good axial sealing of the plug cone 13.

[0065] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the inlet chambers 111a and venturi tubes 12 are arranged in a one-to-one correspondence; wherein, the axial direction of the inlet port 111b is perpendicular to the axial direction of the inlet chamber 111a; in this embodiment, on the base body 111, the two inlet chambers 111a are arranged symmetrically side by side, and the two inlet ports 111b are arranged symmetrically. The structures of the two inlet chambers 111a on the base body 111 are identical to effectively ensure the consistency of the dual-path structure, thereby achieving high precision in synchronous control.

[0066] In this embodiment, the liquid inlet 111b may be further provided with a tubular connector to enable connection with an external supply device, thereby ensuring the ease of connection of the present invention.

[0067] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the base 11 further includes a clamping member 114; wherein, the clamping member 114 is used to fix the venturi tube 12 to the base body 111, so as to ensure reliable installation of the venturi tube 12 and effectively ensure the coaxiality of the venturi tube 12 and the inlet chamber 111a, thereby ensuring high installation accuracy. In this embodiment, the inlet end of the venturi tube 12 extends into the inlet chamber 111a, and the inlet end of the venturi tube 12 and the inlet chamber 111a are nested together; wherein, a first positioning step is provided in the inlet chamber 111a; the first positioning step can achieve mutual abutment with the inlet end of the venturi tube 12, thereby achieving accurate and reliable installation. Furthermore, the clamping member 114 is sleeved on the outside of the venturi tube 12, and the pressing end of the clamping member 114 is screwed to the end of the inlet chamber 111a; thus, the pressing end of the clamping member 114 and the first positioning step are used to clamp and fix the inlet end of the venturi tube 12. In this embodiment, in order to facilitate the reliable installation of the inlet end of the venturi tube 12, the inlet end of the venturi tube 12 is arranged to be radially enlarged, so that the inlet end of the venturi tube 12 abuts against the pressing end of the clamping member 114 and the first positioning step in the axial direction respectively.

[0068] In this embodiment, the pressing end of the clamping member 114 is based on the thread provided on the outside to achieve a reliable connection with the thread provided on the inside of the liquid inlet chamber 111a.

[0069] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, a first sealing ring a is provided between the pressing end of the clamping member 114 and the venturi tube 12; wherein, the first sealing ring a can be set as a copper washer, so as to achieve airtightness at the connection position through the first sealing ring a. In addition, by using a copper washer, it can have better temperature adaptability, thereby ensuring the reliability of the present invention during operation.

[0070] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the clamping member 114 has a tubular structure, and the end of the clamping member 114 away from the pressing end extends beyond the outlet end of the venturi tube 12. In this embodiment, the inner surface of the hollow portion of the clamping member 114 is configured to match the outer surface of the venturi tube 12.

[0071] In this embodiment, the end of the clamping member 114 that extends beyond the venturi tube 12 can form the fluid outlet end, thereby facilitating a reliable connection with the rest of the structure and improving the flexibility of the invention.

[0072] With the above configuration, the venturi tube 12 can be stably fixed based on the clamping member 114. At the same time, the venturi tube 12 can be restricted within the clamping member 114 by connecting the clamping member 114 to the venturi tube 12. This can effectively ensure the reliable and stable structure of the venturi tube 12 during the working process, which is more beneficial to improving the working performance of the present invention.

[0073] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the drive device 14 includes an output structure 141 and a synchronization structure 142; wherein, the output structure 141 may be a linear output device, for example, the output structure 141 may be configured as a high-precision servo mechanism for outputting linear motion. Furthermore, linear output of motion can be achieved by connecting the synchronization structure 142 to the telescopic end of the output structure 141.

[0074] In this embodiment, the synchronization structure 142 includes a fisheye bearing 1421 and a connecting crossbar 1422 mounted on the fisheye bearing 1421. The fisheye bearing 1421 is connected to the telescopic end of the output structure 141, for example, through threaded connection, welding, or bonding. Further, along the length of the connecting crossbar 1422, the opposite ends of the connecting crossbar 1422 are respectively connected to the fixed connection ends of the plug cone 13. In this embodiment, the end of the connecting crossbar 1422 is provided with a mounting hole, and the fixed connection ends of the plug cone 13 are fixed to each other by engaging with the mounting hole. Specifically, the fixed connection ends of the plug cone 13 can be threaded to the mounting hole, or a nested connection can be used to match the fixed connection ends of the plug cone 13 to the mounting hole. Furthermore, positioning screw holes and positioning screws are provided on the side of the fixed connection ends of the plug cone 13 to achieve abutment and restriction of the fixed connection ends of the plug cone 13.

[0075] Through the above configuration, the two plug cones 13 are connected by a connecting crossbar 1422 in the synchronization structure 142, thereby achieving synchronous drive control through the drive device 14. Furthermore, by incorporating a fisheye bearing 1421 in the synchronization structure 142, the installed connecting crossbar 1422 gains a certain degree of freedom in its axial position, compensating for the coaxiality error of the two plug cone supports 112, effectively ensuring the working stability and synchronous control accuracy of the invention.

[0076] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, an adjusting shim D for adjusting the flow range and the dual-path fluid mixing ratio is optionally provided between the fixed connection end of the connecting crossbar 1422 and the plug cone 13; wherein, the flow range of the oxidant control side and the fuel control side can be flexibly adjusted by adjusting the shim D, specifically, increasing the shim thickness of the adjusting shim D to decrease the flow on the corresponding side, and decreasing the shim thickness of the adjusting shim D to increase the flow on the corresponding side; and, the dual-path fluid mixing ratio (i.e., the mixing ratio of oxidant and fuel) can be changed by adjusting the shim D, specifically, increasing the thickness of the adjusting shim D on the oxidant control side to decrease the dual-path fluid mixing ratio, and increasing the thickness of the adjusting shim D on the fuel control side to increase the dual-path fluid mixing ratio.

[0077] Combination Figure 1 , Figure 2 and Figure 4As shown, according to one embodiment of the present invention, the plug cone 13 includes a conical portion and a portion of equal diameter, wherein the conical portion is positioned relative to the inlet of the venturi tube 12 to adjust the flow area of ​​the venturi tube 12 inlet. In this embodiment, the flow area of ​​the venturi tube 12 inlet and the displacement of the plug cone 13 satisfy a linear relationship, thereby achieving linear adjustment of the flow rate over a wide range. Therefore, the linear relationship between the flow area of ​​the venturi tube 12 inlet and the displacement of the plug cone 13 is expressed as:

[0078] A = ax + b

[0079] in, A This indicates the flow area at the inlet of the Venturi tube 12. a and b They are constants, x This indicates the displacement of plug cone 13.

[0080] In this embodiment, during the process of adjusting the mixing ratio of the two-channel fluid by increasing the thickness of the adjusting shim D, the increase in the thickness of the adjusting shim D and the mixing ratio of the two-channel fluid satisfy the following:

[0081] MR =( a 1( x +Δ L )+ b 1) / ( a 2 x + b 2)* k = a 1 / a 2+ a 1*Δ L / ( a 2* x )

[0082] in, MR Indicates the mixing ratio of the two-channel fluid. x The displacement Δ of plug cone 13 is expressed as... L This indicates the increase in the thickness of the adjusting shim D. a 1. b 1. a 2. b 2 are constants, where subscript 1 indicates the oxidizer control side and subscript 2 indicates the fuel control side. k This represents a constant, which is obtained from the physical and state parameters of the oxidant and fuel.

[0083] Combination Figure 1 , Figure 2 and Figure 4As shown, according to one embodiment of the present invention, a cryogenic dual-path flow synchronization regulator based on an adjustable venturi tube further includes: an air replacement structure 16; wherein, the air replacement structure 16 includes: a gas supply line 161 and a polytetrafluoroethylene (PTFE) corrugated pipe 162. In this embodiment, the PTFE corrugated pipe 162 is sleeved on the outside of the plug cone 13; specifically, one end of the PTFE corrugated pipe 162 covers the outside of the end cap 113, and the PTFE corrugated pipe 162 is sealed to the outside of the end cap 113; the other end of the PTFE corrugated pipe 162 covers the outside of the fixed connection end of the plug cone 13, and the PTFE corrugated pipe 162 is sealed to the outside of the plug cone 13. In this embodiment, PTFE corrugated pipes 162 are respectively provided on the two plug cones 13, and the gas supply line 161 is correspondingly used to replace the air in the two arranged PTFE corrugated pipes 162, so as to achieve the effect of adapting to the cryogenic operating environment of the present invention.

[0084] Furthermore, the end cap 113 is provided with a first connecting pipe 112a for connecting the gas transmission line 161 and the hollow part of the PTFE corrugated pipe 162. The inlet of the first connecting pipe 112a is located on the outer surface of the end cap 113, and the outlet of the first connecting pipe 112a is located on the side of the end cap 113 facing the PTFE corrugated pipe 162. In this embodiment, the first connecting pipe 112a can be configured as an annular passage arranged in the end cap 113, with only one inlet to connect to the corresponding port on the gas transmission line 161. Multiple outlets of the first connecting pipe 112a can be provided on the side of the end cap 113 to achieve rapid and stable gas transmission to the hollow part of the PTFE corrugated pipe 162. In this embodiment, the outlets of the first connecting pipe 112a are arranged in a ring on the side of the end cap 113, and multiple outlets (e.g., eight) are evenly spaced. By setting multiple outlets of the first connecting pipe 112a, the effect of uniform distribution around the plug cone 13 can be achieved. On the one hand, the air in the polytetrafluoroethylene corrugated pipe 162 can be quickly discharged, and on the other hand, the surface of the plug cone 13 can be blown away.

[0085] Furthermore, the fixed connection end of the plug cone 13 is provided with a second connecting pipe 13a for connecting the hollow part of the PTFE corrugated tube 162 to the outside. The inlet of the second connecting pipe 13a is located on the outer surface of the plug cone 13, and the outlet of the second connecting pipe 13a is located on the end face away from the PTFE corrugated tube 162. In this embodiment, multiple inlets of the second connecting pipe 13a can be provided, specifically, they can be evenly distributed along the outer surface of the plug cone 13 to increase the receiving range of the discharged gas, thereby improving the discharge efficiency during the gas replacement process. Only one outlet of the second connecting pipe 13a can be provided, thus facilitating connection to multiple inlets of the second connecting pipe 13a. This not only facilitates the arrangement of the outlet of the second connecting pipe 13a on the end face but also effectively reduces the processing difficulty of the second connecting pipe 13a.

[0086] Through the above-described configuration, the present invention, by setting the air replacement structure 16, can achieve the enclosure of the plug cone 13. Furthermore, by introducing dilution gas (such as nitrogen) into the PTFE bellows 162, the internal air can be replaced, effectively preventing icing-induced failures caused by long-term operation at low temperatures and ensuring the overall operational stability of the device. In addition, the present invention fully utilizes the structure of the end cap 113 and the plug cone 13, effectively reducing the number of parts used, greatly improving the utilization efficiency and integration between structures, and effectively reducing the production cost of the present invention.

[0087] Furthermore, the air replacement structure 16 of this invention, by utilizing the end cap 113 and the plug cone 13 to form the inlet and outlet during the gas replacement process, can effectively achieve the corresponding replacement effect during operation, greatly ensuring the flexibility of use of this invention during operation. It can achieve the function of real-time gas replacement, which is more beneficial to suppressing icing of the device.

[0088] Furthermore, the present invention can realize gas replacement during the operation of the device, which can fully match the changes in the internal space of the polytetrafluoroethylene bellows 162 during the movement of the plug cone 13, and more effectively ensure the anti-icing effect of the present invention.

[0089] Combination Figure 1 and Figure 2As shown, according to one embodiment of the present invention, the base 11 further includes a fixing bracket 115; wherein one end of the fixing bracket 115 is connected to the base body 111, and the other end of the fixing bracket 115 is connected to the output structure 141. In this embodiment, the fixing bracket 115 includes a first connecting plate 1151, a second connecting plate 1152, and a connecting beam 1153; the first connecting plate 1151 and the second connecting plate 1152 are arranged parallel to each other and spaced apart, while the connecting beam 1153 is located between the first connecting plate 1151 and the second connecting plate 1152, for achieving a fixed connection between them.

[0090] In this embodiment, the first connecting plate 1151 is connected to the base body 111 by a threaded connector, and the output structure 141 is connected to the second connecting plate 1152 by a threaded connector. In this embodiment, to ensure the accuracy of the output direction of the output structure 141, a positioning pin can be further provided at the connection position between the output structure 141 and the second connecting plate 1152 to achieve stable and accurate operation.

[0091] In this embodiment, the gas pipeline 161 can be fixed to the connecting beam 1153 using a clamp or similar structure to ensure reliable fixation of the gas pipeline 161.

[0092] In this embodiment, the displacement detection device 15 is connected to the drive device 14 to achieve accurate detection of the displacement of the plug cone 13.

[0093] like Figure 4 As shown, according to one embodiment of the present invention, a third sealing ring c may be provided between the end cap 113 and the liquid inlet chamber 111a. The second sealing ring b, the third sealing ring c, and the end cap 113 are sequentially arranged along the axial direction of the plug cone 13 to provide a mechanical seal in addition to the dynamic seal of the second sealing ring b, thereby further improving the sealing performance of the connection. In this embodiment, the third sealing ring c is a polytetrafluoroethylene (PTFE) sealing ring.

[0094] The above description is merely an example of a specific solution of the present invention. For any devices and structures not described in detail herein, it should be understood that they are implemented using common devices and methods already available in the art.

[0095] The above description is merely one embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cryogenic dual-path flow synchronization regulator based on an adjustable Venturi tube, characterized in that, include: The base (11), the venturi tube (12), the plug cone (13), the drive device (14), and the air displacement structure (16) for de-icing the plug cone (13) mounted on the base (11). On the base (11), the Venturi tube (12), the plug cone (13) and the driving device (14) are arranged in sequence; wherein the plug cone (13) is slidably connected to the base (11); The drive device (14) is connected to the plug cone (13) to control the flow area of ​​the venturi tube (12) inlet by adjusting the position of the plug cone (13) relative to the venturi tube (12); The drive unit (14) integrates a displacement detection device (15) for feedback of its output displacement. Two Venturi tubes (12) are arranged side by side, and the plug cones (13) are arranged one-to-one with the Venturi tubes (12) for dual-path flow control of oxidant and fuel; An adjusting shim (D) for adjusting the flow range and the dual-flow mixing ratio is optionally provided between the connecting crossbar (1422) and the fixed connection end of the plug cone (13); wherein, increasing the shim thickness of the adjusting shim (D) reduces the flow rate on the corresponding side, decreasing the shim thickness of the adjusting shim (D) increases the flow rate on the corresponding side; and increasing the thickness of the adjusting shim (D) on the oxidant control side reduces the dual-flow mixing ratio, and increasing the thickness of the adjusting shim (D) on the fuel control side increases the dual-flow mixing ratio; The flow area at the inlet of the Venturi tube (12) and the displacement of the plug cone (13) satisfy a linear relationship, and the linear relationship is expressed as: A = ax + b in, A This indicates the flow area at the inlet of the Venturi tube (12). a and b They are constants, x This indicates the displacement of the plug cone (13); The increase in the thickness of the adjusting shim (D) satisfies the following condition with respect to the dual-channel fluid mixing ratio: MR =( a 1( x +D L )+ b 1) / ( a 2 x + b 2) k = a 1 / a 2+ a 1 D L / ( a 2 x ) in, MR Indicates the mixing ratio of the two-channel fluid. x The displacement of the plug cone (13), Δ L This indicates the increase in the thickness of the adjusting shim (D). a 1. b 1. a 2. b 2 are constants, where subscript 1 indicates the oxidizer control side and subscript 2 indicates the fuel control side. k This represents a constant, which is obtained from the physical and state parameters of the oxidant and fuel.

2. The low-temperature dual-path flow synchronization regulator according to claim 1, characterized in that, The base (11) includes: a base body (111), a plug cone support (112), and an end cap (113). The base body (111) is provided with a hollow liquid inlet cavity (111a) and a liquid inlet (111b) connected to the liquid inlet cavity (111a). The liquid inlet chamber (111a) extends through the opposite ends of the base body (111); The inlet end of the Venturi tube (12) is connected to one end of the liquid inlet chamber (111a), and the end cap (113) is disposed at the other end of the liquid inlet chamber (111a); The plug cone support (112) is coaxially disposed within the liquid inlet chamber (111a) and the liquid inlet chamber (111a), and the plug cone support (112) is disposed adjacent to the end cap (113); The end cap (113) is provided with a first plug cone through hole penetrating its body.

3. The low-temperature dual-path flow synchronization regulator according to claim 2, characterized in that, The liquid inlet chamber (111a) is configured to correspond one-to-one with the Venturi tube (12); The axial direction of the liquid inlet (111b) is perpendicular to the axial direction of the liquid inlet chamber (111a); On the base body (111), the two liquid inlet chambers (111a) are arranged symmetrically side by side, and the two liquid inlets (111b) are arranged symmetrically.

4. The low-temperature dual-path flow synchronization regulator according to claim 3, characterized in that, The base (11) further includes: a clamping element (114); The inlet end of the Venturi tube (12) extends into the liquid inlet chamber (111a), and the inlet end of the Venturi tube (12) and the liquid inlet chamber (111a) are nested together. A first positioning step is provided inside the liquid inlet chamber (111a); The clamping member (114) is sleeved on the outside of the Venturi tube (12), and the pressing end of the clamping member (114) is screwed to the end of the liquid inlet chamber (111a). The pressing end of the clamping member (114) and the first positioning step are used to clamp and fix the inlet end of the venturi tube (12).

5. The low-temperature dual-path flow synchronization regulator according to claim 4, characterized in that, The clamping member (114) has a tubular structure, and the end of the clamping member (114) away from the pressing end extends beyond the outlet end of the venturi tube (12).

6. The low-temperature dual-path flow synchronization regulator according to claim 5, characterized in that, The drive device (14) includes: an output structure (141) and a synchronization structure (142). The synchronization structure (142) includes: a fisheye bearing (1421) and a connecting crossbar (1422) mounted on the fisheye bearing (1421). Along the length of the connecting crossbar (1422), the two opposite ends of the connecting crossbar (1422) are respectively connected to the fixed connection end of the plug cone (13).

7. The low-temperature dual-path flow synchronization regulator according to claim 2, characterized in that, The air replacement structure (16) includes: an air supply line (161) and a polytetrafluoroethylene corrugated pipe (162). The polytetrafluoroethylene corrugated tube (162) is sleeved on the outside of the plug cone (13); One end of the PTFE corrugated tube (162) is covered on the outside of the end cap (113), and the PTFE corrugated tube (162) is sealed to the outside of the end cap (113). The other end of the PTFE corrugated tube (162) is wrapped around the outside of the fixed connection end of the plug cone (13), and the PTFE corrugated tube (162) is sealed to the outside of the plug cone (13). The end cap (113) is provided with a first connecting pipe (113a) for connecting the gas pipeline (161) and the hollow part of the polytetrafluoroethylene corrugated pipe (162). The inlet of the first connecting pipe (113a) is opened on the outer side of the end cap (113), and the outlet of the first connecting pipe (113a) is opened on the side of the end cap (113) facing the polytetrafluoroethylene corrugated pipe (162). The fixed connection end of the plug cone (13) is provided with a second connecting pipe (13a) for connecting the hollow part of the polytetrafluoroethylene corrugated pipe (162) to the outside. The inlet of the second connecting pipe (13a) is opened on the outer side of the plug cone (13), and the outlet of the second connecting pipe (13a) is opened on the end face away from the polytetrafluoroethylene corrugated pipe (162).

8. The low-temperature dual-path flow synchronization regulator according to claim 6, characterized in that, The base (11) further includes: a fixing bracket (115); One end of the fixed bracket (115) is connected to the base body (111), and the other end of the fixed bracket (115) is connected to the output structure (141); A first sealing ring (a) is provided between the pressing end of the clamping member (114) and the venturi tube (12). A second sealing ring (b) is provided between the end cap (113) and the end of the liquid inlet chamber (111a).

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