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

Abstract

The invention relates to a low-temperature double-channel flow synchronous regulator based on an adjustable venturi tube. The low-temperature double-channel flow synchronous regulator comprises a base, the venturi tube installed on the base, a plug cone, a driving device and an air replacement structure used for ice prevention and removal of the plug cone. The venturi tube, the plug cone and the driving device are sequentially arranged on the base; wherein the plug cone is in sliding connection with the base; the driving device is connected with the plug cone so as 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; the driving device is integrated with a displacement detection device for feeding back the output displacement of the driving device; the two venturi tubes are arranged side by side, and the plug cones and the venturi tubes are arranged in a one-to-one correspondence mode so as to be used for two-way flow control over an oxidizing agent and fuel. The high-precision servo mechanism serves as a driving device, the one-driving-two adjustable cavitation venturi tube serves as a flow adjusting element, and the two-way low-temperature oxidizing agent and fuel side flow synchronous control can be achieved.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a low-temperature dual-path flow synchronous regulator based on an adjustable venturi. Background Art

[0002] The adjustable cavitation venturi has been widely used in variable thrust liquid rocket engine supply systems due to its fast flow regulation response speed and high flow control accuracy. Its working principle is to use a movable needle cone to change the flow area of ​​the venturi, thereby achieving the purpose of flow control. In order to achieve simultaneous control of the oxidizer / fuel flow, the existing engine flow regulation and mixing ratio control solutions mainly include two technical forms: The first type uses two separate adjustable cavitation venturis to control the flow rates of the oxidizer and the fuel respectively. The adjustable cavitation venturis are driven by two independent servo mechanisms without mechanical connection to each other. The disadvantages of this method are: due to the differences in response time and working characteristics of the two-way drive controllers, the synchronization of the servo mechanisms on the oxidizer control side and the fuel control side is difficult to ensure, especially the inconsistency of the starting response characteristics and the stopping response characteristics, which ultimately leads to a time difference in the two-way flow regulation, causing a large range of fluctuations in the mixture ratio, thereby affecting the stable and reliable operation of the engine.

[0003] The second type is a dual-way or multi-way venturi tube with a mechanical linkage drive, in which the plug cones of the venturi oxidizer / fuel are connected in parallel and driven by a driving mechanism at the same time; the disadvantages of this method are: the connection method of the two-way plug cones has high rigidity, high requirements for coaxiality and parallelism, and uneven mechanical loads can easily cause the plug cones to be misaligned front and back or even deform the push rod, thereby affecting the flow rate and mixing ratio range.

[0004] In addition to the above-mentioned shortcomings, the existing flow control scheme can only control the flow of normal temperature propellants, while the density and saturated vapor pressure of cryogenic propellants are greatly affected by state parameters such as temperature and pressure, and their flow is easily affected by state parameters. The control accuracy of the servo mechanism and the synchronization of the plug cone are difficult to guarantee at low temperatures. In addition, the dynamic sealing requirements of cryogenic media are strict, and long-term low-temperature operation of the device is prone to low-temperature freezing, affecting the actuation and sealing of moving parts. Summary of the invention

[0005] The object of the present invention is to provide a low-temperature dual-path flow synchronous regulator based on an adjustable venturi.

[0006] To achieve the above-mentioned invention object, the present invention provides a low-temperature dual-path flow synchronous regulator based on an adjustable venturi tube, comprising: a base, a venturi tube mounted on the base, a plug cone, a driving device and an air replacement structure for preventing deicing of the plug cone; On the base, the venturi tube, the plug cone and the driving device are arranged in sequence; wherein the plug cone is slidably connected to the base; The driving device is connected to 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; The driving device is integrated with a displacement detection device for feeding back its output displacement; Two venturi tubes are arranged side by side, and the plug cones are arranged one-to-one corresponding to the venturi tubes, so as to be used for dual-path flow control of the oxidant and the fuel.

[0007] According to one aspect of the present invention, the base comprises: a base body, a plug cone support and an end cover; The base body is provided with a hollow liquid inlet cavity and a liquid inlet port connected to the liquid inlet cavity; The liquid inlet cavity passes through two opposite ends of the base body; The inlet end of the venturi tube is connected to one end of the liquid inlet cavity, and the end cover is arranged at the other end of the liquid inlet cavity; The plug cone support is coaxially arranged in the liquid inlet cavity, and the plug cone support is arranged adjacent to the end cover; The end cover is provided with a first plug cone through hole penetrating the body thereof.

[0008] According to one aspect of the present invention, the liquid inlet chambers are arranged in a one-to-one correspondence with the venturi tubes; The axial direction of the liquid inlet is arranged perpendicular to the axial direction of the liquid inlet cavity; On the base body, the two liquid inlet cavities are symmetrically arranged side by side, and the two liquid inlets are symmetrically arranged.

[0009] According to one aspect of the present invention, the base further comprises: a pressing member; 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 nested with each other; A first positioning step is provided in the liquid inlet cavity; The pressing piece is sleeved on the outside of the venturi tube, and the pressing end of the pressing piece is threadedly connected to the end of the liquid inlet cavity; The pressing end of the pressing member and the first positioning step are used to clamp and fix the inlet end of the venturi tube.

[0010] According to one aspect of the present invention, 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 tube.

[0011] According to one aspect of the present invention, the driving device comprises: an output structure and a synchronization structure; The synchronization structure comprises: a fisheye bearing and a connecting crossbar mounted on the fisheye bearing; Along the length direction of the connecting cross bar, opposite ends of the connecting cross bar are respectively connected to the fixed connecting ends of the plug cone.

[0012] According to one aspect of the present invention, an adjusting gasket for adjusting the flow range and the two-way fluid mixing ratio can be optionally arranged between the connecting cross rod and the fixed connecting end of the plug cone; wherein, the gasket thickness of the adjusting gasket is increased to reduce the flow on the corresponding side, and the gasket thickness of the adjusting gasket is reduced to increase the flow on the corresponding side; and, the thickness of the adjusting gasket on the oxidant control side is increased to reduce the two-way fluid mixing ratio, and the thickness of the adjusting gasket on the fuel control side is increased to increase the two-way fluid mixing ratio.

[0013] According to one aspect of the present invention, the flow area of ​​the venturi inlet and the displacement of the plug cone satisfy a linear relationship, and the linear relationship is expressed as: A = ax + b in, A represents the flow area at the inlet of the venturi, a and b are constants, x represents the displacement of the plug cone; The increase in the thickness of the regulating gasket and the mixing ratio of the two-way fluid satisfy: 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 ) in, MR Indicates the two-way fluid mixing ratio, x represents the displacement of the plug cone, Δ L Indicates the increase in thickness of the adjustment gasket. a 1. b 1. a 2. b 2 are constants, where subscript 1 represents the oxidant control side, subscript 2 represents the fuel control side, k represents a constant, which is obtained from the physical properties and state parameters of the oxidant and fuel.

[0014] According to one aspect of the present invention, the air replacement structure comprises: an air delivery pipeline and a polytetrafluoroethylene bellows; The polytetrafluoroethylene corrugated tube is sleeved on the outside of the plug cone; One end of the polytetrafluoroethylene bellows is covered on the outside of the end cover, and the polytetrafluoroethylene bellows is sealed and connected to the outside of the end cover; The other end of the polytetrafluoroethylene bellows is coated on the outside of the fixed connection end of the plug cone, and the polytetrafluoroethylene bellows is sealed and connected to the outside of the plug cone; The end cap is provided with a first connecting pipe for connecting the gas pipeline and the hollow part of the polytetrafluoro bellows, wherein the inlet of the first connecting pipe is opened on the outer surface of the end cap, and the outlet of the first connecting pipe is opened on the side of the end cap facing the polytetrafluoro bellows; The fixed connection end of the plug cone is provided with a second connecting pipe for connecting the hollow part of the polytetrafluoro bellows with the outside, wherein the inlet of the second connecting pipe is opened on the outer surface of the plug cone, and the outlet of the second connecting pipe is opened on the end surface away from the polytetrafluoro bellows.

[0015] According to one aspect of the present invention, the base further comprises: a fixing bracket; One end of the fixing bracket is connected to the base body, and the other end of the fixing bracket is connected to the output structure; A first sealing ring is provided between the pressing end of the pressing member and the venturi tube; A second sealing ring is arranged between the end cover and the end of the liquid inlet cavity.

[0016] According to one solution of the present invention, the present invention uses a high-precision servo mechanism as a driving device and adopts a one-to-two adjustable cavitation venturi as a flow regulating element, which can be used to achieve synchronous control of the dual-path low-temperature oxidizer and fuel side flows, achieve large-range regulation of the two-path low-temperature propellant flows, and achieve high-resolution flow regulation and high-precision control.

[0017] According to a scheme of the present invention, the present invention can realize the adjustment and control of the flow range and the mixing ratio through the two-way throttling area and displacement linear design principle, and the method of adding adjusting gaskets, so as to realize both a constant mixing ratio in the adjustment process and a monotonic change of the mixing ratio in the adjustment process.

[0018] According to one solution of the present invention, the present invention can fully solve the problem of freezing failure of the regulating mechanism during the low-temperature propellant flow regulation process by arranging an air replacement structure at the plug cone and the end cover.

[0019] According to one scheme of the present invention, the present invention makes full use of the structure of the end cover and the plug cone, effectively reduces the number of parts used, greatly improves the utilization efficiency and integration between the structures, and effectively reduces the production cost of the present invention. Among them, the present invention, through the air replacement structure set up, forms the inlet and outlet in the process of replacing the gas by using the end cover and the plug cone, which can effectively achieve the corresponding replacement effect in the running state, greatly guarantees the flexibility of use of the present invention during operation, and can achieve the effect of real-time gas replacement, which is more beneficial to the icing of the inhibition device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a low-temperature dual-path flow synchronous regulator according to an embodiment of the present invention; Figure 2 is a perspective view schematically showing a low-temperature dual-path flow synchronous regulator according to an embodiment of the present invention; Figure 3 is a diagram schematically showing the installation position of a regulating gasket in a low-temperature dual-path flow synchronous regulator according to an embodiment of the present invention; Figure 4 It is a partial enlarged diagram schematically showing a low-temperature dual-path flow synchronous regulator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0024] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a low-temperature dual-path flow synchronous regulator based on an adjustable venturi tube of the present invention comprises: a base 11, a venturi tube 12, a plug cone 13, a driving device 14 and an air displacement structure 16 for preventing deicing of the plug cone 13 installed on the base 11; in this embodiment, the venturi tube 12 and the driving device 14 are respectively installed on the base 11 in a detachable manner, and the detachable connection method is used to improve the flexibility of their assembly. In this embodiment, 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 driving device 14 is connected to the plug cone 13, so as to control the flow area of ​​the inlet of the venturi tube 12 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 on the driving device 14 to feedback its output displacement, wherein the displacement detection device 15 can use a potentiometer to achieve accurate feedback of the output displacement of the driving device 14 through the acquired electrical signal, thereby achieving precise control of the driving displacement. In this embodiment, the position detection error of the displacement detection device 15 is less than 5‰.

[0025] In this embodiment, two venturi tubes 12 are arranged side by side, and the plug cones 13 are arranged one-to-one corresponding to the venturi tubes 12. Based on the combination of the venturi tubes 12 and the plug cones 13, dual-path flow control of the oxidant and the fuel is achieved.

[0026] In this embodiment, the structures of the two venturi tubes 12 are consistent, and accordingly, the structures of the two plug cones 13 are consistent, so as to ensure the consistency of the two-way structure, thereby facilitating the synchronization accuracy of the dual-way control, and making the working performance of the present invention better.

[0027] Combination Figure 1 , Figure 2 and Figure 4As shown, according to an embodiment of the present invention, the base 11 includes: a base body 111, a plug cone support 112 and an end cover 113; wherein the base body 111 is provided with a hollow liquid inlet chamber 111a and a liquid inlet port 111b connected to the liquid inlet chamber 111a; in this embodiment, the liquid inlet chamber 111a runs through the 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 chamber 111a, and the end cover 113 is arranged at the other end of the liquid inlet chamber 111a; further, the plug cone support 112 is coaxially arranged in the liquid inlet chamber 111a, and the plug cone support 112 is adjacent to the end cover 113. In this embodiment, the plug cone support 112 is annular in structure as a whole, and thus, the plug cone support 112 can be coaxially nested and connected with the liquid inlet chamber 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 cavity 111a connected to the end cover 113 can be arranged in a radially reduced manner, thereby forming a stepped structure in the liquid inlet cavity 111a, so that the plug cone support 112 can be embedded in the radially reduced position to achieve convenient and flexible installation of the plug cone support 112.

[0028] In this embodiment, in order 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, thereby achieving accurate limitation of its installation position based on the abutment between the plug cone support 112 and the annular limiting boss 111a1.

[0029] In this embodiment, the end cover 113 is provided with a first plug cone through hole penetrating the body thereof, and the first plug cone through hole is coaxially arranged with the hollow portion of the plug cone support 112 , thereby allowing the plug cone 13 to conveniently pass through the first plug cone through hole to achieve a sliding connection with the plug cone support 112 .

[0030] Combination Figure 1 , Figure 2 and Figure 4 As shown, according to one embodiment of the present invention, a second sealing ring b is provided between the end cover 113 and the end of the liquid inlet chamber 111a, wherein the second sealing ring b is provided between the annular limiting boss 111a1 and the end cover 113 to achieve dynamic sealing between the plug cone 13 and the plug cone support 112 at the sliding position to avoid reverse overflow of the fluid. In this embodiment, the second sealing ring b is a low-temperature resistant spring energy storage sealing ring, which is pressed by the end cover 113 to ensure good axial sealing of the plug cone 13.

[0031] Combination Figure 1 and Figure 2As shown, according to an embodiment of the present invention, the liquid inlet chamber 111a is arranged in one-to-one correspondence with the venturi tube 12; wherein the axial direction of the liquid inlet port 111b is arranged perpendicular to the axial direction of the liquid inlet chamber 111a; in this embodiment, 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. wherein the structures of the two liquid inlet chambers 111a on the base body 111 are consistent, so as to effectively ensure the consistency of the dual-path structure, thereby achieving high precision of synchronous control.

[0032] In this embodiment, the liquid inlet 111b may be further provided with a tubular connector to achieve connection with an external supply device, so as to ensure the connection convenience of the present invention.

[0033] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the base 11 further includes: a pressing member 114; wherein the pressing member 114 is used to fix the venturi tube 12 on the base body 111, so as to ensure that the venturi tube 12 is installed reliably, and to effectively ensure the coaxiality between the venturi tube 12 and the liquid inlet cavity 111a, so as to ensure high precision of installation. In this embodiment, the inlet end of the venturi tube 12 extends into the liquid inlet cavity 111a, and the inlet end of the venturi tube 12 and the liquid inlet cavity 111a are mutually nested; wherein a first positioning step is provided in the liquid inlet cavity 111a; the first positioning step can be used to achieve mutual abutment with the inlet end of the venturi tube 12, so as to achieve accurate and reliable installation. Furthermore, the pressing piece 114 is sleeved on the outside of the venturi tube 12, and the pressing end of the pressing piece 114 is screwed to the end of the liquid inlet cavity 111a; furthermore, the pressing end of the pressing piece 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 enlarged in the radial direction, so that the inlet end of the venturi tube 12 is respectively abutted against the pressing end of the pressing piece 114 and the first positioning step in the axial direction.

[0034] In this embodiment, the pressing end of the pressing member 114 is based on the threads arranged on the outside to cooperate with the threads arranged on the inside of the liquid inlet cavity 111 a to achieve a reliable connection between them.

[0035] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a first sealing ring a is provided between the pressing end of the pressing member 114 and the venturi tube 12; wherein the first sealing ring a can be provided as a copper gasket, so that the air tightness of the connection position is achieved through the provided first sealing ring a. In addition, by adopting the copper gasket, it can have better temperature adaptability, thereby ensuring the reliability of the present invention during operation.

[0036] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the pressing member 114 is a tubular structure, and the end of the pressing member 114 away from the pressing end exceeds the outlet end of the venturi tube 12. In this embodiment, the inner side surface of the hollow portion of the pressing member 114 is matched with the outer side surface of the venturi tube 12.

[0037] In this embodiment, the end of the pressing member 114 that extends beyond the venturi tube 12 can form an outlet end of the fluid, thereby conveniently achieving a reliable connection with other structures, thereby improving the flexibility of use of the present invention.

[0038] Through the above-mentioned arrangement, based on the arrangement of the clamping piece 114, the Venturi tube 12 can be stably fixed, and the Venturi tube 12 can be confined in the clamping piece 114 by means of the sleeve connection between the clamping piece 114 and the Venturi tube 12, thereby effectively ensuring 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.

[0039] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the driving device 14 includes: an output structure 141 and a synchronization structure 142; wherein the output structure 141 can be a linear output device, for example, the output structure 141 can be set as a high-precision servo mechanism for outputting linear motion. Furthermore, the linear output of the motion can be achieved by connecting the synchronization structure 142 to the telescopic end of the output structure 141.

[0040] In this embodiment, the synchronization structure 142 includes: a fisheye bearing 1421 and a connecting crossbar 1422 mounted on the fisheye bearing 1421; wherein the fisheye bearing 1421 is connected to the telescopic end of the output structure 141, for example, by threaded connection, welding, bonding, etc. Further, along the length direction of the connecting crossbar 1422, the opposite ends of the connecting crossbar 1422 are respectively connected to the fixed connection end of the plug cone 13. In this embodiment, a mounting hole is provided at the end of the connecting crossbar 1422, and then, the fixed connection end of the plug cone 13 is fixed to each other by matching with the mounting hole; specifically, the fixed connection end of the plug cone 13 can be screwed to the mounting hole by threaded connection, or the fixed connection end of the plug cone 13 can be connected to the mounting hole by nesting, and the fixed connection end of the plug cone 13 can be further provided with a positioning screw hole and a positioning screw on the side of the fixed connection end of the plug cone 13 to achieve the abutment restriction on the fixed connection end of the plug cone 13.

[0041] Through the above arrangement, the two plug cones 13 are connected together by setting the connecting cross bar 1422 in the synchronization structure 142, and then the effect of synchronous drive control can be achieved through the driving device 14. Further, by setting the fisheye bearing 1421 in the synchronization structure 142, the installed connecting cross bar 1422 can have a certain degree of freedom in the axial position of the cross bar, so as to compensate for the coaxiality error of the two-way plug cone support 112, and effectively ensure the working stability and the precision of synchronous control of the present invention.

[0042] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to one embodiment of the present invention, an adjusting gasket D for adjusting the flow range and the two-way fluid mixing ratio can be optionally set between the connecting cross bar 1422 and the fixed connecting end of 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 gasket D, specifically, the gasket thickness of the adjusting gasket D is increased to reduce the flow on the corresponding side, and the gasket thickness of the adjusting gasket D is reduced to increase the flow on the corresponding side; and, the two-way fluid mixing ratio (i.e., the mixing ratio of the oxidant and the fuel) can be changed by adjusting the gasket D, specifically, the thickness of the adjusting gasket D on the oxidant control side is increased to reduce the two-way fluid mixing ratio, and the thickness of the adjusting gasket D on the fuel control side is increased to increase the two-way fluid mixing ratio.

[0043] Combination Figure 1 , Figure 2 and Figure 4 As shown, according to an embodiment of the present invention, the plug cone 13 includes: a cone portion and an equal diameter portion, wherein the cone portion is used to achieve a relative position with the inlet of the venturi tube 12 to adjust the flow area at the inlet of the venturi tube 12. In this embodiment, the flow area at the inlet of the venturi tube 12 and the displacement of the plug cone 13 satisfy a linear relationship, thereby achieving linear regulation of a wide range of flow. For this purpose, the linear relationship between the flow area at the inlet of the venturi tube 12 and the displacement of the plug cone 13 is expressed as: A = ax + b in, A represents the flow area at the inlet of the venturi tube 12, a and b are constants, x The displacement of the plug cone 13 is shown.

[0044] In this embodiment, in the process of adjusting the mixing ratio of the two-way fluid by increasing the thickness of the adjusting gasket D, the increase value of the thickness of the adjusting gasket D and the mixing ratio of the two-way fluid satisfy: 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 ) in, MR Indicates the two-way fluid mixing ratio, x represents the displacement of the plug cone 13, Δ L Indicates the increase in thickness of the adjustment gasket D. a 1. b 1. a 2. b 2 are constants, where subscript 1 represents the oxidant control side, subscript 2 represents the fuel control side, k represents a constant, which is obtained from the physical properties and state parameters of the oxidant and fuel.

[0045] Combination Figure 1 , Figure 2 and Figure 4 As shown, according to one embodiment of the present invention, a low-temperature dual-way flow synchronous regulator based on an adjustable venturi tube of the present invention further includes: an air replacement structure 16; wherein the air replacement structure 16 includes: a gas supply pipeline 161 and a polytetrafluoro bellows 162. In this embodiment, the polytetrafluoro bellows 162 is sleeved on the outside of the plug cone 13; specifically, one end of the polytetrafluoro bellows 162 is coated on the outside of the end cover 113, and the polytetrafluoro bellows 162 is sealed and connected to the outside of the end cover 113; the other end of the polytetrafluoro bellows 162 is coated on the outside of the fixed connection end of the plug cone 13, and the polytetrafluoro bellows 162 is sealed and connected to the outside of the plug cone 13. In this embodiment, polytetrafluoro bellows 162 are respectively arranged on the two plug cones 13, and the gas supply pipeline 161 is correspondingly used to perform gas supply replacement on the air in the two arranged polytetrafluoro bellows 162, so as to achieve the effect of the present invention adapting to the low-temperature operating environment.

[0046] Further, the end cap 113 is provided with a first connecting pipe 112a for connecting the gas pipeline 161 and the hollow part of the polytetrafluoro bellows 162, wherein the inlet of the first connecting pipe 112a is opened on the outer surface of the end cap 113, and the outlet of the first connecting pipe 112a is opened on the side of the end cap 113 facing the polytetrafluoro bellows 162; in this embodiment, the first connecting pipe 112a can be set as an annular passage arranged in the end cap 113, and only one inlet is provided to achieve connection with the corresponding port on the gas pipeline 161, and the outlet of the first connecting pipe 112a can be provided on the side of the end cap 113 to achieve the effect of rapid and stable gas delivery to the hollow part of the polytetrafluoro bellows 162. In this embodiment, the outlets of the first connecting pipe 112a are distributed in an annular manner on the side of the end cap 113, and multiple (such as 8) outlets are provided at equal intervals. By providing multiple outlets of the first connecting pipes 112a, a uniform distribution effect around the plug cone 13 can be achieved. On the one hand, the air in the polytetrafluoroethylene bellows 162 can be quickly removed, and on the other hand, the surface of the plug cone 13 can be blown away.

[0047] 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 polytetrafluoro bellows 162 and the outside, wherein 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 polytetrafluoro bellows 162. In this embodiment, the inlet of the second connecting pipe 13a can be set to multiple, and it can be distributed at equal intervals along the outer side of the plug cone 13, so as to increase the receiving range of the exhaust gas, which is conducive to improving the exhaust efficiency in the process of replacing gas. The outlet of the second connecting pipe 13a can be set to one, thereby, it is convenient to realize the connection with the inlet of multiple second connecting pipes 13a, which can facilitate the arrangement of the outlet of the second connecting pipe 13a on the end face on the one hand, and can also effectively reduce the processing difficulty of the second connecting pipe 13a on the other hand.

[0048] Through the above arrangement, the present invention can achieve the enclosure of the plug cone 13 by setting the air replacement structure 16, and then the internal air can be replaced by inputting dilution gas (such as nitrogen) into the polytetrafluoroethylene bellows 162, which can effectively prevent the device from working at low temperatures for a long time and causing icing and failure, and effectively ensure the operation stability of the entire device. In addition, the present invention also fully utilizes the structure of the end cover 113 and the plug cone 13, effectively reduces the number of parts used, greatly improves the utilization efficiency and integration between the structures, and effectively reduces the production cost of the present invention.

[0049] In addition, the air replacement structure 16 of the present invention can effectively achieve the corresponding replacement effect in the operating state by using the end cover 113 and the plug cone 13 to form the inlet and outlet in the replacement gas process, which greatly ensures the flexibility of use of the present invention during operation. It can achieve the effect of real-time gas replacement, which is more beneficial to the icing of the inhibition device.

[0050] In addition, 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.

[0051] Combination Figure 1 and Figure 2 As shown, according to an 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, and 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.

[0052] 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, in order 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.

[0053] In this embodiment, the gas pipeline 161 can be fixed to the connecting beam 1153 by using a structure such as a clamp, so as to ensure that the gas pipeline 161 is reliably fixed.

[0054] In this embodiment, the displacement detection device 15 is connected to the driving device 14 to achieve accurate detection of the displacement of the plug cone 13 .

[0055] like Figure 4 As shown, according to an embodiment of the present invention, a third sealing ring c may be further provided between the connection position of the end cover 113 and the liquid inlet chamber 111a, wherein the second sealing ring b, the third sealing ring c and the end cover 113 are provided in sequence along the axial direction of the plug cone 13, so as to further provide a mechanical seal in addition to the dynamic seal of the second sealing ring b, so as to further improve the sealing performance of the connection position. In this embodiment, the third sealing ring c is a polytetrafluoroethylene sealing ring.

[0056] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0057] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low temperature dual-path flow synchronous regulator based on an adjustable venturi, characterized in that: include: A base (11), a venturi tube (12), a plug cone (13), a drive device (14), and an air displacement structure (16) for preventing deicing of the plug cone (13) installed 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 driving device (14) is connected to the plug cone (13) so as to control the flow area of ​​the inlet of the Venturi tube (12) by adjusting the position of the plug cone (13) relative to the Venturi tube (12); The driving device (14) is integrated with a displacement detection device (15) for feeding back its output displacement; 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) to be used for dual-path flow control of the oxidant and the fuel.

2. The low-temperature dual-path flow synchronous regulator according to claim 1, characterized in that: The base (11) comprises: a base body (111), a plug cone support (112) and an end cover (113); The base body (111) is provided with a hollow liquid inlet cavity (111a) and a liquid inlet port (111b) connected to the liquid inlet cavity (111a); The liquid inlet cavity (111a) passes through two 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 cover (113) is arranged at the other end of the liquid inlet chamber (111a); The plug cone support (112) is coaxially arranged with the liquid inlet cavity (111a) in the liquid inlet cavity (111a), and the plug cone support (112) is arranged adjacent to the end cover (113); The end cover (113) is provided with a first plug cone through hole penetrating the body thereof.

3. The low temperature dual-path flow synchronous regulator according to claim 2, characterized in that: The liquid inlet cavity (111a) and the venturi tube (12) are arranged in a one-to-one correspondence; The axial direction of the liquid inlet (111b) is arranged perpendicular to the axial direction of the liquid inlet cavity (111a); On the base body (111), the two liquid inlet chambers (111a) are symmetrically arranged side by side, and the two liquid inlet ports (111b) are symmetrically arranged.

4. The low-temperature dual-path flow synchronous regulator according to claim 3, characterized in that: The base (11) further comprises: a pressing member (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 arranged to be nested with each other; A first positioning step is provided in the liquid inlet cavity (111a); The pressing piece (114) is sleeved on the outside of the venturi tube (12), and the pressing end of the pressing piece (114) is threadedly connected to the end of the liquid inlet chamber (111a); The pressing end of the pressing 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 synchronous regulator according to claim 4, characterized in that: The pressing piece (114) is a tubular structure, and an end of the pressing piece (114) away from the pressing end exceeds the outlet end of the Venturi tube (12).

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

7. The low temperature dual-path flow synchronous regulator according to claim 6, characterized in that: An adjusting gasket (D) for adjusting the flow range and the two-way fluid mixing ratio can be optionally arranged between the connecting cross bar (1422) and the fixed connection end of the plug cone (13); wherein the gasket thickness of the adjusting gasket (D) is increased to reduce the flow on the corresponding side, and the gasket thickness of the adjusting gasket (D) is reduced to increase the flow on the corresponding side; and, the thickness of the adjusting gasket (D) on the oxidant control side is increased to reduce the two-way fluid mixing ratio, and the thickness of the adjusting gasket (D) on the fuel control side is increased to increase the two-way fluid mixing ratio.

8. The low temperature dual-path flow synchronous regulator according to claim 7, characterized in that: 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 represents the flow area at the inlet of the venturi (12), a and b are constants, x represents the displacement of the plug cone (13); The thickness increase value of the regulating gasket (D) and the mixing ratio of the two-way fluid meet the following requirements: 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 two-way fluid mixing ratio, x represents the displacement of the plug cone (13), Δ L Indicates the thickness increase of the adjustment gasket (D). a 1. b 1. a 2. b 2 are constants, where subscript 1 represents the oxidant control side, subscript 2 represents the fuel control side, k represents a constant, which is obtained from the physical properties and state parameters of the oxidant and fuel.

9. The low-temperature dual-path flow synchronous regulator according to claim 8, characterized in that: The air replacement structure (16) comprises: an air delivery pipeline (161) and a polytetrafluoroethylene bellows (162); The polytetrafluoroethylene bellows (162) is sleeved on the outside of the plug cone (13); One end of the polytetrafluoroethylene bellows (162) is coated on the outside of the end cover (113), and the polytetrafluoroethylene bellows (162) is sealed and connected to the outside of the end cover (113); The other end of the polytetrafluoroethylene bellows (162) is coated on the outside of the fixed connection end of the plug cone (13), and the polytetrafluoroethylene bellows (162) is sealed and connected to the outside of the plug cone (13); The end cover (113) is provided with a first connecting pipe (113a) for connecting the gas transmission pipe (161) and the hollow portion of the polytetrafluoroethylene corrugated pipe (162), wherein an inlet of the first connecting pipe (113a) is opened on the outer surface of the end cover (113), and an outlet of the first connecting pipe (113a) is opened on a side of the end cover (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 bellows (162) and the outside, wherein the inlet of the second connecting pipe (13a) is opened on the outer surface of the plug cone (13), and the outlet of the second connecting pipe (13a) is opened on the end surface away from the polytetrafluoroethylene bellows (162).

10. The low temperature dual-path flow synchronous regulator according to claim 9, characterized in that: The base (11) further comprises: a fixing bracket (115); 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); A first sealing ring (a) is provided between the pressing end of the pressing member (114) and the venturi tube (12); A second sealing ring (b) is provided between the end cover (113) and the end of the liquid inlet chamber (111a).

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