Low-temperature cavitation venturi tube and low-temperature rocket engine system

Abstract

The invention provides a low-temperature cavitation venturi tube and a low-temperature rocket engine system, and the venturi tube comprises a tube body assembly which is provided with a fluid channel; at least part of the valve element is arranged in the fluid channel; the driving mechanism is connected with the valve element and drives the valve element to reciprocate in the axial direction of the fluid channel so as to adjust the opening degree of a first gap defined by the valve element and the inner wall of the fluid channel. A heat exchange channel extending in the axial direction is formed in the driving mechanism, communicates with the atmospheric environment and is used for enabling the driving mechanism to conduct heat exchange with air in the atmospheric environment. Due to the fact that the heat exchange channel is communicated with the atmospheric environment, air in the atmospheric environment can exchange heat with the driving mechanism when flowing through the heat exchange channel, thermal stress deformation of the driving mechanism is reduced, and the problem that the driving mechanism loses efficacy due to the phenomena that the driving mechanism is stuck and the like is solved. Therefore, the control precision of the driving mechanism on the opening degree of the first gap is ensured, and the adjustment of the venturi tube on the fluid flow in the fluid channel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature rocket engine flow regulation, and more particularly to a low-temperature cavitation venturi tube and a low-temperature rocket engine system. Background Art

[0002] With the increasingly widespread application of cryogenic fluids in fields such as aerospace, petrochemical, and refrigeration technologies, the requirements for cryogenic fluid flow control are also getting higher and higher. For example, in the aerospace field, it can be used for the flow regulation of propellants in reusable cryogenic rocket engines such as liquid nitrogen, liquid hydrogen, liquid oxygen, and methane. The main difficulty in cryogenic flow control is how to maintain the stability and accuracy of flow regulation in a cryogenic environment, while ensuring that the equipment can withstand the challenges of material strength and sealing performance brought by high pressure and low temperature.

[0003] A low-temperature cavitation venturi tube is a flow regulation device that combines the principle of venturi tube flow regulation and the control of cavitation phenomenon. It has high flow control accuracy and is particularly suitable for the flow regulation of propellants in low-temperature rocket engines. However, when the low-temperature cavitation venturi tube is in use, it needs to be used in conjunction with a driving mechanism (such as a motor). When the driving mechanism controls the flow change, it will be affected by the temperature of the cryogenic fluid inside the low-temperature venturi tube. For example, if the cryogenic fluid is liquid nitrogen, the temperature of liquid nitrogen is usually around -200°C. Under the influence of such ultra-low temperature of the cryogenic fluid, the thermal stress of the driving mechanism of the venturi tube is large, resulting in large deformation, which not only affects the control accuracy of the cryogenic fluid, but may even cause phenomena such as jamming of the driving mechanism and lead to the failure of the driving mechanism. Once the normal function of the venturi tube is seriously disturbed, the entire venturi tube will be unable to normally regulate the flow of the cryogenic fluid. Moreover, in a cryogenic environment, the following problems may also occur in the venturi tube: the low temperature may cause the lubricating oil and grease inside the motor to become viscous, increasing the resistance during startup and operation; the low temperature may also cause the resistance of the motor winding to decrease; the low temperature is also likely to cause the failure of the sealing structure inside the venturi tube.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The present invention provides a low-temperature cavitation venturi tube and a low-temperature rocket engine system to solve the technical problems of low fluid flow control accuracy and driving mechanism failure caused by the temperature of the cryogenic fluid inside the venturi tube in the existing low-temperature cavitation venturi tube.

[0006] In a first aspect, the present invention provides a low-temperature cavitation venturi tube, which includes: a tube body assembly formed with a fluid passage; a valve core at least partially disposed in the fluid passage; and a driving mechanism connected to the valve core and driving the valve core to reciprocate axially along the fluid passage for adjusting the opening degree of a first gap formed between the valve core and the inner wall of the fluid passage to adjust the fluid flow rate in the fluid passage. Wherein, the driving mechanism is formed with a heat exchange passage extending along the axial direction, and the heat exchange passage communicates with the atmospheric environment for enabling the driving mechanism to perform heat exchange with the air in the atmospheric environment.

[0007] In some embodiments, the driving mechanism includes a driving motor, a ball screw, and a coupling. The driving motor includes a motor tube body and a motor shaft extending out of the motor tube body. One end of the ball screw is connected to the motor shaft through the coupling, and the other end is connected to the valve core. The ball screw is used for converting the rotational motion of the driving motor into the linear motion of the valve core to drive the valve core to reciprocate axially along the fluid passage. The motor shaft is formed with a first heat exchange passage, the coupling is formed with a second heat exchange passage, and the ball screw is formed with a third heat exchange passage. The first heat exchange passage, the second heat exchange passage, and the third heat exchange passage are sequentially connected to form the heat exchange passage.

[0008] In some embodiments, a first electric heating wire is embedded in the inner wall of the heat exchange passage or a first electric heating wire is disposed inside the heat exchange passage. The first electric heating wire is used for connecting to an external power source to heat the air flowing through the heat exchange passage.

[0009] In some embodiments, the first heat exchange passage is provided with a relatively arranged first inlet and a second inlet opened along its radial direction. The first inlet and the second inlet communicate with the atmospheric environment, and the outlet end of the third heat exchange passage communicates with the atmospheric environment.

[0010] In some embodiments, the driving mechanism further includes a mounting frame, and the mounting frame is axially located between the motor tube body and the tube body assembly. The mounting frame includes a main body and a plurality of first heat exchange fins disposed outside the main body. The plurality of first heat exchange fins are spaced along the axial direction, and the plurality of first heat exchange fins and the main body together enclose a mounting cavity. The mounting cavity communicates with the atmospheric environment through the gaps between adjacent two of the first heat exchange fins, and the heat exchange passage is located in the mounting cavity.

[0011] In some embodiments, the main body includes a plurality of support rods, a first connecting member, and a second connecting member. The plurality of support rods are arranged at intervals along the circumference of the mounting frame, and each of the first heat exchange fins is connected to the plurality of support rods in the circumferential direction. The first connecting member and the second connecting member are located at both ends of the plurality of support rods in the axial direction and are arranged at intervals from the corresponding first heat exchange fins. The first connecting member abuts against the motor tube body, and the second connecting member abuts against the tube assembly.

[0012] In some embodiments, the tube assembly includes a main tube body, an inlet end tube body, and an outlet end tube body. The main tube body is formed with a first connection channel. The inlet end tube body is installed on the main tube body and is formed with a first liquid inlet channel. The outlet end tube body is installed on the main tube body and is formed with a first liquid outlet channel. The first liquid inlet channel, the first connection channel, and the first liquid outlet channel are sequentially communicated to form the fluid channel. The main tube body abuts against the mounting frame in the axial direction, and a plurality of second heat exchange fins are arranged at intervals on the outside of the main tube body near one end of the mounting frame.

[0013] In some embodiments, a second electric heating wire is wound around the first heat exchange fin and / or a third electric heating wire is wound around the second heat exchange fin. The second electric heating wire and the third electric heating wire are used to connect to an external power supply.

[0014] In some embodiments, the low-temperature cavitation venturi tube further includes a sealing member. The sealing member includes a sealing connecting member and an elastic sealing member. The sealing connecting member is arranged between the valve core and the main tube body. The elastic sealing member is arranged between the sealing connecting member and the valve core, and the elastic sealing member is a metal spring energy storage sealing ring.

[0015] In some embodiments, the first liquid outlet channel includes a converging section flow channel, a throat flow channel, and a diverging section flow channel that are sequentially communicated along the axial direction. The converging section flow channel is located on the side of the throat flow channel close to the first connection channel in the axial direction.

[0016] In some embodiments, the driving mechanism further includes: an adapter for connecting the ball screw to the valve core; a limit connecting member connected to the adapter and the valve core; a limit bearing disposed on the limit connecting member; and a limit optical axis disposed on the mounting frame and oppositely disposed to the limit bearing, and the limit optical axis is used to abut against the limit bearing to limit the movement of the limit bearing in the axial direction.

[0017] In some embodiments, a second liquid outlet channel is further formed in the main pipe body, a second connection channel is further formed in the outlet end pipe body, the outlet end pipe body and the main pipe body together form a second liquid inlet channel, the second liquid inlet channel communicates with the first connection channel, and the second connection channel is arranged on the outer wall of at least part of the first liquid outlet channel. The second liquid inlet channel, the second connection channel and the second liquid outlet channel are sequentially communicated to form a cooling channel, and the outlet end of the second liquid outlet channel is used for communicating with the atmospheric environment.

[0018] In some embodiments, the second liquid outlet channel includes an installation section, an adjustment section and a discharge section that communicate with each other, and the outlet end of the discharge section is used for communicating with the atmospheric environment. The cryogenic cavitation venturi tube further includes an adjustment component, the adjustment component is connected to the installation section, and part of the adjustment component and the inner wall of the adjustment section enclose a second gap with adjustable opening to adjust the fluid flow rate entering the discharge section.

[0019] In some embodiments, the adjustment component and the main pipe body are made of materials with different expansion rates, and the expansion degree of the main pipe body under the temperature difference with the fluid is greater than the expansion degree of the adjustment component under the temperature difference with the fluid, so as to adjust the opening degree of the second gap enclosed by the adjustment component and the inner wall of the adjustment section.

[0020] In some embodiments, the adjustment component includes an adjustment screw, the adjustment screw includes a connection section and a cooperation section, the connection section is threadedly connected to the inner wall of the installation section, at least part of the cooperation section is formed into a conical structure, and the connection section is arranged to be able to move relative to the installation section under an external force, so that different parts of the cooperation section can enclose the second gap with the inner wall of the adjustment section.

[0021] In a second aspect, the present invention further provides a cryogenic rocket engine system, which includes a rocket engine and the above-mentioned cryogenic cavitation venturi tube, and the cryogenic cavitation venturi tube can adjust the fluid flow rate entering the rocket engine.

[0022] Compared with the prior art, the cryogenic cavitation venturi tube and the cryogenic rocket engine system provided by the present invention have at least the following

[0023] Beneficial effects:

[0024] In the present application, the pipe body assembly serves as the housing structure of the cryogenic cavitation venturi tube, which is mainly used to form a flow channel for the circulation of cryogenic fluid. The valve core and the driving mechanism constitute a regulating valve mechanism. The valve core serves as the regulating valve body, and the driving mechanism serves as the regulating valve power mechanism. Then, based on the cooperation of the valve core and the driving mechanism, the opening degree of the first gap enclosed by the valve core and the inner wall of the fluid channel can be changed, thereby realizing the adjustment of the fluid flow rate in the fluid channel by the valve core.

[0025] During the use of the cryogenic cavitation venturi tube, the temperature of the cryogenic fluid in the fluid passage of the tube body assembly will be conducted to the driving mechanism through the valve core. Since the driving mechanism in this application forms a heat exchange passage extending axially and the heat exchange passage communicates with the atmospheric environment, the air in the atmospheric environment can exchange heat with the driving mechanism when flowing through the heat exchange passage, thereby being able to timely increase the temperature of the driving mechanism, reduce the influence of the temperature of the cryogenic fluid on the driving mechanism, further reduce the thermal stress deformation of the driving mechanism, avoid problems such as the driving mechanism getting stuck and resulting in the failure of the driving mechanism, and thus ensure the control accuracy of the driving mechanism for the opening of the first gap, improving the regulation of the fluid flow rate in the fluid passage by the cryogenic cavitation venturi tube.

[0026] Other features and advantages of the cryogenic cavitation venturi tube and the cryogenic rocket engine system provided by the present invention will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 A perspective view of the cryogenic cavitation venturi tube provided by an embodiment of the present application;

[0029] Figure 2 An external structure schematic diagram of the cryogenic cavitation venturi tube provided by an embodiment of the present application;

[0030] Figure 3 An internal structure schematic diagram of the cryogenic cavitation venturi tube provided by an embodiment of the present application;

[0031] Figure 4 An internal heat exchange passage structure schematic diagram of the driving mechanism provided by an embodiment of the present application;

[0032] Figure 5 A structure schematic diagram of the mounting frame of the driving mechanism provided by an embodiment of the present application;

[0033] Figure 6 A positional relationship schematic diagram of the first heat exchange fin and the second heating wire on the mounting frame provided by an embodiment of the present application;

[0034] Figure 7 A positional relationship schematic diagram of the second heat exchange fin and the third heating wire on the tube body assembly provided by an embodiment of the present application;

[0035] Figure 8 Structural schematic diagram of the sealing connector in the sealing component provided by the embodiment of the present application;

[0036] Figure 9 Stereogram of the elastic seal in the sealing component provided by the embodiment of the present application;

[0037] Figure 10 Internal structural schematic diagram of the elastic seal provided by the embodiment of the present application.

[0038] Figure 11 Internal flow channel structural schematic diagram of the pipe body assembly provided by the embodiment of the present application;

[0039] Figure 12 Structural schematic diagram of an adjusting component provided by the embodiment of the present application;

[0040] Figure 13 Structural schematic diagram of another adjusting component provided by the embodiment of the present application.

[0041] The reference signs are as follows:

[0042] 100, low-temperature cavitation venturi tube;

[0043] 10, pipe body assembly; 11, main pipe body; 111, second heat exchange fin; 12, inlet end pipe body; 13, outlet end pipe body; A, fluid channel; A1, first liquid inlet channel; A2, first connection channel; A3, first liquid outlet channel; A31, contraction section flow channel; A32, throat flow channel; A33, expansion section flow channel; B, cooling channel; B1, second liquid inlet channel; B2, second connection channel; B3, second liquid outlet channel; B31, installation section; B32, adjustment section; B33, discharge section; D, heat exchange channel; D1, first heat exchange channel; D11, first inlet; D12, second inlet; D2, second heat exchange channel; D3, third heat exchange channel;

[0044] 20, valve core; 21, main body part; 22, adjustment part;

[0045] 30, drive mechanism; 31, drive motor; 311, motor pipe body; 312, motor shaft; 32, ball screw; 33, coupling; 34, installation frame; 341, main body; 3411, support rod; 3412, first connecting piece; 3413, second connecting piece; 342, first heat exchange fin; 35, adapter; 36, limit connecting piece; 37, limit bearing; 38, limit optical axis; E, installation cavity;

[0046] 40, adjusting component; 41, adjusting screw; 411, connecting section; 412, mating section; 42, servo cylinder;

[0047] T1, the second heating wire; T2, the third heating wire;

[0048] C, the axial direction. Specific embodiments

[0049] In the description of the present invention, it should be understood that when descriptions of orientation or positional relationships such as the terms "center", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. appear, without special instructions, they are understood to be based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In addition, features limited by "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Features limited by "first" and "second" may explicitly or implicitly include at least one of the limited features. When descriptions such as "a plurality" appear, the general meaning is at least including two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present invention, unless otherwise clearly specified and limited, when terms such as "installation", "connection", "connection", "fixation", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] In the description of this specification, when terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] The low-temperature rocket engine system provided by the embodiments of the present application includes a rocket engine and a low-temperature cavitation venturi 100.

[0054] A rocket engine can provide controllable power for the propulsion and control of a spacecraft, enhancing the adaptability and operability of the spacecraft to flight missions and orbits. It is an ideal choice for the power system of a space vehicle. With the increasing annual exploration of space by humans, the importance of developing variable-thrust propulsion technology has become even more evident. The main method of changing the thrust of a rocket engine is to adjust the flow rate of the propellant, and the adjustment and control accuracy of the propellant flow rate directly affect the performance of the rocket engine.

[0055] The cryogenic cavitation venturi 100 is a flow regulating device that combines the principle of venturi flow regulation and the control of cavitation phenomenon. It controls the flow velocity and pressure difference of the cryogenic fluid and suppresses the gasification phenomenon of the cryogenic fluid by adjusting the valve opening, thereby achieving precise control of the flow rate of the cryogenic fluid. Therefore, by using the cryogenic cavitation venturi 100 in this application to adjust and control the flow rate of the fluid (such as propellant) in the rocket engine, the performance of the rocket engine can be significantly improved.

[0056] Figure 1 It is a perspective view of the cryogenic cavitation venturi provided by an embodiment of this application. Figure 2 It is a schematic diagram of the external structure of the cryogenic cavitation venturi provided by an embodiment of this application. Figure 3 It is a schematic diagram of the internal structure of the cryogenic cavitation venturi provided by an embodiment of this application.

[0057] Please refer to Figures 1 to 3 , the cryogenic cavitation venturi 100 provided by an embodiment of this application includes a pipe body assembly 10, a valve core 20, and a driving mechanism 30.

[0058] The pipe body assembly 10 forms a fluid passage A for the flow of cryogenic fluid. Among them, the cryogenic fluid can be reusable fluids such as liquid nitrogen, liquid hydrogen, liquid oxygen, and methane. The cryogenic fluid in the fluid passage A is used to be transported to the rocket engine and used as the propellant of the rocket engine.

[0059] At least a part of the valve core 20 is disposed in the fluid passage A, and the valve core 20 is connected to the driving mechanism 30 and reciprocates along the axial direction C of the fluid passage A under the action of the driving mechanism 30.

[0060] The driving mechanism 30 is disposed on one side of the pipe body assembly 10 and connected to the valve core 20. It is used to provide power for the valve core 20 so that the valve core 20 can reciprocate along the axial direction C of the fluid passage A, thereby realizing the adjustment of the fluid flow rate in the fluid passage A by the valve core 20.

[0061] That is to say, the valve core 20 can extend into different depth positions in the fluid passage A under the action of the driving mechanism 30, and at different depth positions, the opening degree of the first gap formed by the valve core 20 and the inner wall of the fluid passage A is different, thereby realizing the adjustment of the fluid flow rate in the fluid passage A by the valve core 20.

[0062] The drive mechanism 30 is formed with a heat exchange channel D extending along the axial direction C, and the heat exchange channel D communicates with the atmospheric environment, so that the drive mechanism 30 can exchange heat with the air in the atmospheric environment.

[0063] In the embodiment of the present application, the pipe body assembly 10 serves as the housing structure of the cryogenic cavitation venturi tube 100, which is mainly used to form a flow channel for the low-temperature fluid to flow through. The valve core 20 and the drive mechanism 30 constitute a regulating valve mechanism. The valve core 20 serves as the regulating valve body, and the drive mechanism 30 serves as the regulating valve power mechanism. Based on the cooperation between the valve core 20 and the drive mechanism 30, the opening degree of the first gap formed by the valve core 20 and the inner wall of the fluid channel A can be changed, thereby realizing the regulation of the fluid flow rate in the fluid channel A by the valve core 20.

[0064] During the use of the cryogenic cavitation venturi tube 100, the temperature of the low-temperature fluid in the fluid channel A of the pipe body assembly 10 will be conducted to the drive mechanism 30 through the valve core 20. Since the drive mechanism 30 in the present application is formed with a heat exchange channel D extending along the axial direction C, and the heat exchange channel D communicates with the atmospheric environment, the air in the atmospheric environment can exchange heat with the drive mechanism 30 when flowing through the heat exchange channel D, so as to timely increase the temperature of the drive mechanism 30, reduce the influence of the temperature of the low-temperature fluid on the drive mechanism 30, and further reduce the thermal stress deformation of the drive mechanism 30, avoiding the failure problem of the drive mechanism 30 caused by phenomena such as the drive mechanism 30 being stuck. Thus, the control accuracy of the opening degree of the first gap by the drive mechanism 30 is ensured, and the regulation of the fluid flow rate in the fluid channel A by the cryogenic cavitation venturi tube 100 is improved.

[0065] Figure 4 It is a schematic diagram of the internal heat exchange channel structure of the drive mechanism provided by the embodiment of the present application, where the arrows in the figure indicate the flow direction of the air.

[0066] In some embodiments, please refer to Figure 3 and Figure 4 , the drive mechanism 30 includes a drive motor 31, a ball screw 32 and a coupling 33.

[0067] The drive motor 31 includes a motor tube body 311 and a motor shaft 312 extending out of the motor tube body 311. One end of the ball screw 32 is connected to the motor shaft 312 through the coupling 33, and the other end is connected to the valve core 20. The ball screw 32 is used to convert the rotational motion of the drive motor 31 into the linear motion of the valve core 20, so as to drive the valve core 20 to reciprocate along the axial direction C of the fluid channel A.

[0068] Among them, the motor shaft 312 is formed with a first heat exchange channel D1, the coupling 33 is formed with a second heat exchange channel D2, the ball screw 32 is formed with a third heat exchange channel D3, and the first heat exchange channel D1, the second heat exchange channel D2 and the third heat exchange channel D3 are communicated in sequence to form a heat exchange channel D.

[0069] Understandably, at least part of the motor shaft 312 is a hollow structure to form the first heat exchange channel D1, the coupling 33 is a hollow structure to form the second heat exchange channel D2, and the ball screw 32 is a hollow structure to form the third heat exchange channel D3.

[0070] In this embodiment, the motor shaft 312, the ball screw 32 and the coupling 33 together constitute the rotating part of the drive mechanism 30. Through the design of the hollow motor shaft 312, the hollow coupling 33 and the hollow ball screw 32, the motor shaft 312, the coupling 33 and the ball screw 32 together form the heat exchange channel D. Then, the air in the heat exchange channel D can perform heat exchange on each part of the rotating part of the drive mechanism 30, so as to timely increase the temperature of the rotating part of the drive mechanism 30, reduce the influence of the temperature of the low-temperature fluid on the drive mechanism 30, further reduce the thermal stress deformation of the drive mechanism 30, and avoid the failure problem of the drive mechanism 30 caused by phenomena such as the drive mechanism 30 being stuck. Moreover, through the design of the hollow motor shaft 312, the hollow coupling 33 and the hollow ball screw 32 to form the heat exchange channel D, it is possible to achieve a significant reduction in the influence of the low-temperature fluid on the drive mechanism 30 without extending the overall length of the motor shaft 312, the ball screw 32 and the coupling 33, and without affecting the high-precision flow control of the low-temperature cavitation venturi tube 100.

[0071] This is because if the overall length of the motor shaft 312, the ball screw 32 and the coupling 33 is extended (i.e., a long-neck structure is formed), although the influence of the low-temperature fluid on the drive mechanism 30 can also be reduced, the long-neck structure of the drive mechanism 30 increases the distance between the drive motor 31 and the valve core 20, which inevitably increases the length of the ball screw 32. Due to the flexibility of the ball screw 32, when the working power of the low-temperature cavitation venturi tube is too large or the working pressure of the low-temperature fluid is too large, the torque borne by the ball screw 32 will be too large. Due to the flexibility of the ball screw 32, the rotation control of the drive motor 31 will have a delay effect on the displacement control of the valve core 20, thus affecting the high-precision flow control of the venturi tube.

[0072] In addition, since the drive mechanism 30 in the present application is designed with a hollow motor shaft 312, a hollow coupling 33, and a hollow ball screw 32 to form a heat exchange channel D, based on Fourier's Law in solid heat conduction, through the setting of the heat exchange channel D, the heat conduction cross-sectional area of the drive mechanism 30 is reduced, thereby reducing the overall heat conductivity of the drive mechanism 30, which in turn helps to reduce the heat loss transferred from the rear-end drive mechanism 30 to the front-end pipe body assembly 10, the valve core 20, and the low-temperature fluid, thus enhancing the self-low-temperature protection effect of the cryogenic cavitation venturi tube 100.

[0073] Fourier's Law in solid heat conduction describes the relationship between the heat flux density (q) and the temperature gradient, heat conduction length, heat conduction cross-sectional area, and thermal conductivity during the heat conduction process. The basic form of Fourier's Law is:

[0074]

[0075] where q is the heat flux density (W / m2), which refers to the heat flow per unit area; k is the thermal conductivity (W / (m·K)), an inherent property of the material, indicating the ability of the material to transfer heat with a unit temperature difference per unit area per unit time; A is the heat conduction cross-sectional area (m 2 ), which is the cross-sectional area for heat transfer; ΔT is the temperature difference (K), which is the temperature difference between the two ends during the heat transfer process; Δx is the heat conduction length (m), which is the distance or the thickness of the material during the heat transfer process; the negative sign indicates that heat is transferred from high temperature to low temperature.

[0076] According to Fourier's Law, it can be known that the heat flux density q is proportional to the thermal conductivity k of the material, proportional to the heat conduction cross-sectional area A, inversely proportional to the heat conduction length Δx, and proportional to the temperature difference ΔT. Among them, the thermal conductivity k is an inherent property of the material, independent of the heat conduction length and cross-sectional area, but it will affect the heat conduction effect.

[0077] In this application, under the environmental conditions of a fixed thermal conductivity coefficient k and a fixed temperature difference ΔT at the front and rear ends, the heat flux density q decreases as the heat conduction cross-sectional area A decreases; the heat flux density q decreases as the heat conduction length Δx increases. Therefore, in this application, to ensure the normal operation of the drive mechanism 30 and control the movement of the control valve element 20, when the outer diameter and heat conduction length of the ball screw 32 remain unchanged, compared with a solid ball screw, the hollow ball screw 32 has a smaller heat conduction cross-sectional area, so that the heat flux density q can be reduced to at least 66.6% of the state of the solid ball screw. Therefore, through the design of the hollow motor shaft 312, the hollow coupling 33, and the hollow ball screw 32 in this application, the overall thermal conductivity of the drive mechanism 30 is reduced, which helps to reduce the heat loss transferred from the rear-end drive mechanism 30 to the front-end pipe body assembly 10, the valve element 20, and the low-temperature fluid, thereby enhancing the self-low-temperature protection effect of the low-temperature cavitation venturi tube 100.

[0078] In some embodiments, a first electric heating wire is embedded in the inner wall of the heat exchange channel D or the first electric heating wire is disposed inside the heat exchange channel D, wherein the first electric heating wire is used to be connected to an external power supply to heat the air flowing through the heat exchange channel D.

[0079] By embedding the first electric heating wire in the inner wall of the heat exchange channel D or disposing the first electric heating wire inside the heat exchange channel D, the first electric heating wire can be electrically heated by an external power supply to further increase the heat input to the drive mechanism 30, so as to quickly increase the temperature of each part of the drive mechanism 30, reduce the influence of the temperature of the low-temperature fluid on the drive mechanism 30, thereby ensuring the control accuracy of the drive mechanism 30 for the first gap opening degree and improving the fluid flow regulation in the fluid channel A of the low-temperature cavitation venturi tube 100.

[0080] In some embodiments, please refer to Figure 4 , the first heat exchange channel D1 is provided with a relatively arranged first inlet D11 and a second inlet D12 along its radial direction, both the first inlet D11 and the second inlet D12 are communicated with the atmospheric environment, and the outlet end of the third heat exchange channel D3 is also communicated with the atmospheric environment.

[0081] In this embodiment, based on the fact that the first inlet D11, the second inlet D12, and the outlet end of the third heat exchange channel D3 are all communicated with the atmospheric environment, a circulation channel is formed between the heat exchange channel D and the atmospheric environment, so that the air in the atmospheric environment can enter and flow in and out of the drive mechanism 30, thereby realizing the circulating heat exchange effect of the air. And, based on the multi-inlet setting, it helps to improve the heat exchange efficiency between the air in the atmospheric environment and the drive mechanism 30.

[0082] Figure 5 It is a schematic structural diagram of the installation frame of the drive mechanism provided by the embodiment of this application. Figure 6Schematic diagram of the positional relationship between the first heat exchange fin and the second heating wire on the installation frame provided by the embodiment of the present application, which is also the Figure 2 enlarged view of the circle M in

[0083] In some embodiments, please refer to Figure 1 、 Figure 3 and Figure 5 , the driving mechanism 30 further includes an installation frame 34, and the installation frame 34 is located between the motor tube body 311 and the tube body assembly 10 in the axial direction C.

[0084] The installation frame 34 includes a main body 341 and a plurality of first heat exchange fins 342 arranged on the outer side of the main body 341. The plurality of first heat exchange fins 342 are arranged at intervals along the axial direction C, and the plurality of first heat exchange fins 342 and the main body 341 together enclose an installation cavity E. The installation cavity E communicates with the atmospheric environment through the gaps between adjacent two first heat exchange fins 342, and the heat exchange channel D is located in the installation cavity E.

[0085] In this embodiment, since a plurality of first heat exchange fins 342 are arranged on the installation frame 34, and the installation cavity E communicates with the atmospheric environment through the gaps between adjacent two first heat exchange fins 342, during the operation of the low-temperature cavitation venturi tube 100, on the one hand, the air in the atmospheric environment can exchange heat with the plurality of first heat exchange fins 342, so as to increase the temperature in the installation cavity E by increasing the area of the heat exchange surface. And the heat exchange channel D is located in the installation cavity E, which further helps to increase the temperature of the heat exchange channel D; on the other hand, the air in the atmospheric environment can also enter the installation cavity E through the gaps between adjacent two first heat exchange fins 342 to directly exchange heat with the heat exchange channel D, thereby significantly increasing the temperature of the environment where the heat exchange channel D is located (i.e., heating the heat exchange channel D outside the heat exchange channel D). Therefore, the present application simultaneously performs heat exchange inside and outside the heat exchange channel D, thereby significantly improving the heat exchange efficiency between the driving mechanism 30 and the air in the atmospheric environment.

[0086] Furthermore, please refer to Figure 6 , a second heating wire T1 can be wound around the plurality of first heat exchange fins 342. The second heating wire T is used to connect to an external power supply to heat the first heat exchange fins 342 by external power supply electric heating, so as to further increase the heat input to the driving mechanism 30, thereby quickly increasing the temperature of each part of the driving mechanism 30 and reducing the influence of the temperature of the low-temperature fluid on the driving mechanism 30.

[0087] Please continue to refer to Figure 5 , the main body 341 includes a plurality of support rods 3411, a first connecting member 3412 and a second connecting member 3413.

[0088] A plurality of support rods 3411 are arranged at intervals along the circumference of the mounting frame 34, and each first heat exchange fin 342 is connected to the plurality of support rods 3411 in the circumferential direction. The first connecting member 3412 and the second connecting member 3413 are located at both ends of the plurality of support rods 3411 in the axial direction C and are arranged at intervals from the corresponding first heat exchange fins 342. The first connecting member 3412 abuts against the motor tube body 311, and the second connecting member 3413 abuts against the tube body assembly 10.

[0089] In this embodiment, the main body 341 is formed into a frame structure by a plurality of support rods 3411, a first connecting member 3412 and a second connecting member 3413. Then, through the gaps formed between the various components of the frame structure, the heat exchange efficiency of the heat exchange channel D can be further improved on the outside of the heat exchange channel D.

[0090] In some embodiments, please continue to refer to Figure 1 and Figure 3 , the drive mechanism 30 further includes an adapter 35, a limit connecting member 36, a limit bearing 37 and a limit optical axis 38.

[0091] The adapter 35 is used to connect the ball screw 32 to the valve core 20. The limit connecting member 36 is connected to the adapter 35 and the valve core 20. The limit bearing 37 is arranged on the limit connecting member 36. The limit optical axis 38 is arranged on the mounting frame 34 and is arranged opposite to the limit bearing 37, and the limit optical axis 38 is used to abut against the limit bearing 37 to limit the movement of the limit bearing 37 in the axial direction C.

[0092] Figure 7 It is a schematic diagram of the positional relationship between the second heat exchange fin and the third heating wire on the tube body assembly provided by the embodiment of the present application, and it is also an enlarged view of the circle N in Figure 2 .

[0093] In some embodiments, please refer to Figures 1 to 3 and Figure 7 , the tube body assembly 10 includes a main tube body 11, an inlet end tube body 12 and an outlet end tube body 13.

[0094] The main tube body 11 is the main structure of the tube body assembly 10, and it forms a first connection channel A2. The inlet end tube body 12 is installed on the main tube body 11 and is hermetically connected to the main tube body 11. For example, a sealing structure such as a sealing ring can be provided between the inlet end tube body 12 and the main tube body 11, and the inlet end tube body 12 forms a first liquid inlet channel A1.

[0095] The outlet end tube body 13 is installed on the main tube body 11 and is hermetically connected to the main tube body 11. For example, a sealing structure such as a sealing ring can be provided between the outlet end tube body 13 and the main tube body 11, and the outlet end tube body 13 forms a first liquid outlet channel A3.

[0096] Among them, the first liquid inlet channel A1, the first connection channel A2, and the first liquid outlet channel A3 are connected in sequence to form a fluid channel A, and the fluid channel A is used to deliver cryogenic fluid to the rocket engine.

[0097] The main body 11 abuts against the second connecting member 3413 of the mounting frame 34 in the axial direction C, and a plurality of second heat exchange fins 111 are arranged at intervals on the outside of the end of the main body 11 close to the mounting frame 34.

[0098] In this embodiment, by arranging a plurality of second heat exchange fins 111 on the main body 11, during the operation of the cryogenic cavitation venturi tube 100, the air in the atmospheric environment can exchange heat with the plurality of second heat exchange fins 111, so as to increase the temperature of the end of the main body 11 close to the driving mechanism 30 by increasing the heat exchange surface area of the main body 11, thereby avoiding the influence of the too low temperature of the main body 11 on the driving mechanism 30.

[0099] Further, please refer to Figure 7 , a third electric heating wire T2 can be wound around the plurality of second heat exchange fins 111, and the third electric heating wire T2 is used to connect to an external power supply to heat the second heat exchange fins 111 by means of external power supply electric heating, so as to reduce the influence of the main body 11 and the cryogenic fluid inside it on the driving mechanism 30.

[0100] Figure 8 It is a schematic structural diagram of a sealing connector in the sealing component provided by the embodiment of the present application. Figure 9 It is a three-dimensional view of an elastic seal in the sealing component provided by the embodiment of the present application. Figure 10 It is a schematic internal structure diagram of the elastic seal provided by the embodiment of the present application.

[0101] In some embodiments, please refer to Figures 8 to 10 , the cryogenic cavitation venturi tube 100 of the present application further includes a sealing component 50, and the sealing component 50 is arranged between the adjusting portion 22 of the valve core 20 and the main body 11 for sealingly connecting the valve core 20 and the main body 11.

[0102] Specifically, the sealing component 50 includes a sealing connector 51 and an elastic seal 52. The sealing connector 51 is arranged between the adjusting portion 22 and the main body 11, and the elastic seal 52 is arranged between the sealing connector 51 and the adjusting portion 22. Among them, the elastic seal 52 is a metal spring energy storage sealing ring.

[0103] In this embodiment, since the main material of the metal spring energy storage sealing ring can still maintain stable mechanical properties at low temperatures, and the resilience of the energy storage spring can further ensure the sealing performance, the present application improves the low-temperature resistance of the sealing component 50 by using the metal spring energy storage sealing ring, thereby ensuring that the sealing component 50 can still maintain a good sealing effect under high and low temperature alternating conditions and extending the service life of the sealing component 50.

[0104] Figure 11 FIG. is a schematic diagram of the internal flow channel structure of the pipe body assembly provided by the embodiment of the present application, where the arrow direction in the figure is the flow direction of the low-temperature fluid.

[0105] In some embodiments, please refer to Figure 11 , the first liquid outlet channel A3 includes a contraction section flow channel A31, a throat flow channel A32, and an expansion section flow channel A33 that are sequentially connected along its axial direction C. The contraction section flow channel A31 is located on the side of the throat flow channel A32 close to the first connection channel A2 in the axial direction C. That is to say, the contraction section flow channel A31, the throat flow channel A32, and the expansion section flow channel A33 are sequentially connected along the flow direction of the low-temperature fluid.

[0106] It should be noted that since the contraction section flow channel A31, the throat flow channel A32, and the expansion section flow channel A33 of the first liquid outlet channel A3 are sequentially connected along the flow direction of the low-temperature fluid, after the low-temperature fluid enters the first connection channel A2 from the first liquid inlet channel A1, the low-temperature fluid reaching the first liquid outlet channel A3 will first enter the contraction section flow channel A31 to accelerate. According to Bernoulli's principle, the increase in fluid velocity will lead to a decrease in its static pressure. When the static pressure drops below the saturation vapor pressure of the low-temperature fluid, cavitation will occur in the pipe. At this time, the fluid flow rate is only affected by the inlet pressure, the diameter of the throat flow channel A32, and the saturation vapor pressure of the low-temperature fluid, and is not affected by the downstream outlet pressure. Therefore, based on this principle, through the cooperation of the valve core 20 and the driving mechanism 30, the flow area of the throat flow channel A32 (i.e., the opening degree of the first gap formed by the valve core 20 and the inner wall of the throat flow channel A32) can be adjusted, thereby realizing the flow control in the first liquid outlet channel A3, ensuring more sufficient cavitation of the low-temperature fluid in the first liquid outlet channel A3, and improving the stability of the flow rate. Finally, the low-temperature fluid decelerates through the throat flow channel A32 and then through the expansion section flow channel A33 to increase the static pressure of the low-temperature fluid, so that the fluid that evaporates after the static pressure of the low-temperature fluid is greater than its saturation vapor pressure condenses again and flows out from the outlet of the expansion section flow channel A33.

[0107] In some embodiments, please refer to Figure 11, the main body 11 is further formed with a second liquid outlet channel B3, the outlet end pipe body 13 is further formed with a second connection channel B2, the outlet end pipe body 13 and the main body 11 together form a second liquid inlet channel B1, the second liquid inlet channel B1 communicates with the first connection channel A2, and the second connection channel B2 is disposed on at least a part of the outer wall of the first liquid outlet channel A3. Exemplarily, the second connection channel B2 is disposed at least on the outer wall of the throat flow channel A32 of the first liquid outlet channel A3.

[0108] Wherein, the second liquid inlet channel B1, the second connection channel B2 and the second liquid outlet channel B3 are sequentially communicated to form a cooling channel B, and the outlet end of the second liquid outlet channel B3 is used for communicating with the atmospheric environment.

[0109] In this embodiment, since the pipe body assembly 10 is simultaneously formed with the fluid channels A and the cooling channel B that communicate with each other, the second connection channel B2 of the cooling channel B is disposed at least on the outer wall of the throat flow channel A32 of the first liquid outlet channel A3, and the outlet end of the second liquid outlet channel B3 is directly communicated with the atmospheric environment, which is equivalent to having two paths of low-temperature fluid flowing in the pipe body assembly 10. The low-temperature fluid in the fluid channel A is transported to the rocket engine, and when the low-temperature fluid in the cooling channel B flows through the second connection channel B2, the low-temperature fluid can exchange heat with the outer wall of the throat flow channel A32, so that the temperature of the part of the pipe body assembly 10 forming the throat flow channel A32 can be greatly reduced, and the temperature difference between the low-temperature fluid in the throat flow channel A32 and the part of the pipe body assembly 10 forming the throat flow channel A32 is reduced. Thereby, the gasification phenomenon of the low-temperature fluid in the throat flow channel A32 can be inhibited, and further the cavitation effect of the low-temperature fluid at the throat of the first liquid outlet channel A3 can be improved, thereby improving the flow control accuracy of the low-temperature fluid at the outlet of the first liquid outlet channel A3. In addition, based on the cooperation of the fluid channel A and the cooling channel B, the amount of heat insulation material can be reduced, making the overall structure of the cryogenic cavitation venturi tube 100 more compact and applicable to relatively compact systems, such as in aerospace.

[0110] Please continue to refer to Figure 3 , the valve core 20 includes a main body portion 21 and an adjusting portion 22. One end of the main body portion 21 is connected to the driving mechanism 30, and the other end is connected to the adjusting portion 22. At least a part of the adjusting portion 22 is formed into a conical structure, such as the adjusting portion 22 is integrally formed into a conical structure or the end of the adjusting portion 22 away from the main body portion 21 is formed into a conical structure, which is not specifically limited in this application. Wherein, the main body portion 21 can drive the adjusting portion 22 to reciprocate axially C relative to the throat flow channel A32 of the first liquid outlet channel A3 under the action of the driving mechanism 30 to adjust the fluid flow rate in the throat flow channel A32 of the first liquid outlet channel A3.

[0111] Based on that at least a part of the adjusting part 22 is formed into a conical structure, under the action of the driving mechanism 30, different parts of the adjusting part 22 can form a first gap with different opening degrees with the throat flow channel A32 of the first liquid outlet channel A3, thereby realizing the control of the flow area of the throat flow channel A32. Moreover, in this application, by controlling the movement of the valve core 20 through the driving mechanism 30, the adjustment of the flow area of the throat flow channel A32 can be realized. Its structure is simple, with high precision and good practicability.

[0112] Please continue to refer to Figure 3 and Figure 11 , the second liquid outlet channel B3 includes an installation section B31, an adjustment section B32 and a discharge section B33 that are connected to each other. The outlet end of the discharge section B33 is used to communicate with the atmospheric environment. Among them, the cryogenic cavitation venturi tube 100 further includes an adjustment component 40. The adjustment component 40 is connected to the installation section B31, and a part of the adjustment component 40 and the inner wall of the adjustment section B32 form an adjustable second gap to adjust the fluid flow rate entering the discharge section B33.

[0113] Since a part of the adjustment component 40 can form an adjustable second gap with the inner wall of the adjustment section B32, the fluid flow rate entering the discharge section B33 can be adjusted based on the change in the opening degree of the second gap, thereby ensuring the stable flow rate of the cryogenic fluid at the outlet of the first liquid outlet channel A3.

[0114] In some embodiments, the adjustment component 40 and the main body 11 are made of materials with different expansion rates, and the expansion degree of the main body 11 under the temperature difference effect with the cryogenic fluid is greater than the expansion degree of the adjustment component 40 under the temperature difference effect with the cryogenic fluid (correspondingly, the contraction degree of the main body 11 under the temperature difference effect with the cryogenic fluid is greater than the contraction degree of the adjustment component 40 under the temperature difference effect with the cryogenic fluid) to adjust the opening degree of the second gap formed by the adjustment component 40 and the inner wall of the adjustment section B32.

[0115] It can be understood that in order to ensure that the expansion degree of the main body 11 under the temperature difference effect with the cryogenic fluid is greater than the expansion degree of the adjustment component 40 under the temperature difference effect with the cryogenic fluid, the adjustment component 40 can be made of a material with a low expansion rate (such as a metal material), and the main body 11 is made of a material with a high expansion rate (such as a metal material).

[0116] Based on the fact that the regulating member 40 and the main body 11 are made of materials with different expansion rates, at the initial stage of low-temperature fluid transportation, the temperature difference between the main body 11 and the low-temperature fluid inside it is the largest. Since the expansion degree of the main body 11 under the temperature difference with the low-temperature fluid is greater than that of the regulating member 40 under the temperature difference with the low-temperature fluid, the opening degree of the second gap formed by the regulating member 40 and the inner wall of the regulating section B32 is the largest, so that the fluid flow rate into the discharge section B33 is the largest; as the temperature difference between the main body 11 and the low-temperature fluid inside it gradually decreases, the main body 11 and the regulating member 40 begin to gradually contract, and the opening degree of the second gap formed by the regulating member 40 and the inner wall of the regulating section B32 gradually decreases, so that the fluid flow rate into the discharge section B33 gradually decreases; when the temperatures of the main body 11 and the regulating member 40 are close to the low-temperature fluid (the temperature difference is the smallest), the contraction degree of the main body 11 and the regulating member 40 is the largest, making the opening degree of the second gap the smallest (close to closing), so that the fluid flow rate into the discharge section B33 is the smallest.

[0117] Therefore, because the regulating member 40 and the main body 11 are made of materials with different expansion rates, the opening degree of the second gap formed by the regulating member 40 and the inner wall of the regulating section B32 can adaptively increase with the increase of the temperature difference and decrease with the decrease of the temperature difference. Thus, without manual or electric cylinder adjustment, the fluid flow rate into the discharge section B33 can be adjusted, ensuring the stable flow rate of the low-temperature fluid at the outlet of the first liquid outlet channel A3. Its structure is simple and the reliability is high.

[0118] Figure 12 It is a schematic structural diagram of a regulating member provided by an embodiment of the present application.

[0119] In some embodiments, please continue to refer to Figure 3 and Figure 12 , the regulating member 40 includes an adjusting screw 41. The adjusting screw 41 includes a connecting section 411 and a mating section 412. The connecting section 411 is threadedly connected to the inner wall of the mounting section B31, and at least part of the mating section 412 is formed as a conical structure. Among them, the connecting section 411 is arranged to be able to move relative to the mounting section B31 under an external force, so that different parts of the mating section 412 can form second gaps with different opening degrees with the inner wall of the regulating section B32.

[0120] In this embodiment, based on the threaded connection between the connection section 411 of the adjusting screw 41 and the inner wall of the installation section B31, the depth of the connection section 411 of the adjusting screw 41 screwed into the installation section B31 can be manually adjusted by using a tool. After the throat flow channel A32 is cooled in place by the low-temperature fluid in the cooling channel B, the adjusting screw 41 can be screwed clockwise, so that the opening degree of the second gap formed by the mating section 412 and the inner wall of the adjusting section B32 is reduced, and the flow rate is smaller; when the temperature difference is large, the adjusting screw 41 is screwed counterclockwise, so that the opening degree of the second gap formed by the mating section 412 and the inner wall of the adjusting section B32 is increased, and the flow rate is increased. Therefore, by controlling the adjusting screw 41 to be screwed into or out of the installation section B31, different parts of the mating section 412 can form second gaps with different opening degrees with the inner wall of the adjusting section B32, thereby controlling the fluid flow rate into the discharge section B33, and further improving the cooling efficiency of the low-temperature fluid in the cooling channel B on the outlet end pipe body 13.

[0121] Figure 13 It is a schematic structural diagram of another adjusting component provided by the embodiment of the present application.

[0122] In some embodiments, please refer to Figure 13 , the adjusting component 40 includes an adjusting screw 41 and a servo electric cylinder 42. The adjusting screw 41 includes a connection section 411 and a mating section 412. The connection section 411 is threadedly connected to the inner wall of the installation section B31, and at least part of the mating section 412 is formed as a conical structure. The servo electric cylinder 42 is connected to the connection section 411 and is used to drive the connection section 411 to move, so as to adjust the depth of the connection section 411 screwed into the installation section B31, so that different parts of the mating section 412 can form second gaps with different opening degrees with the inner wall of the adjusting section B32.

[0123] By driving the connection section 411 to move through the servo electric cylinder 42 to adjust the depth of the connection section 411 screwed into the installation section B31, the cooling efficiency of the low-temperature fluid in the cooling channel B on the outlet end pipe body 13 can be further improved.

[0124] Furthermore, the adjusting component 40 further includes a measuring unit and a control unit. The measuring unit is used to monitor the temperature of the part of the main pipe body 11 that forms the adjusting section B32. The control unit is connected to the measuring unit and the servo electric cylinder 42, and is used to control the servo electric cylinder 42 according to the temperature monitored by the measuring unit to adjust the opening degree of the second gap formed by the mating section 412 and the inner wall of the adjusting section B32.

[0125] Specifically, based on the pre-set data relationship between the temperature of the main pipe body 11 and the opening degree of the second gap, when the temperature difference between the main pipe body 11 and the low-temperature fluid is too large, the servo cylinder 42 is feedback-regulated to increase the opening degree of the second gap; when the temperature difference is small, the servo cylinder 42 is adjusted to reduce the opening degree of the second gap. Therefore, based on the temperature data of the part of the main pipe body 11 forming the regulating section B32 monitored, the servo cylinder 42 can be closed-loop controlled and regulated, so as to realize the fully automatic regulation of the opening degree of the second gap, thereby further improving the cooling efficiency of the low-temperature fluid in the cooling channel B on the outlet end pipe body 13. Moreover, based on the improvement of the cooling efficiency of the low-temperature fluid in the cooling channel B on the outlet end pipe body 13, the emission amount of the low-temperature fluid from the cooling channel B to the atmospheric environment can be reduced.

[0126] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A low temperature cavitation venturi (100), characterized in that: include: A tube assembly (10) is formed with a fluid channel (A); A valve core (20) is at least partially disposed in the fluid passage (A); as well as a driving mechanism (30) connected to the valve core (20) and driving the valve core (20) to reciprocate along the axial direction (C) of the fluid channel (A) so as to adjust the opening of a first gap formed by the valve core (20) and the inner wall of the fluid channel (A) so as to adjust the fluid flow in the fluid channel (A); The driving mechanism (30) is formed with a heat exchange channel (D) extending along the axial direction (C), and the heat exchange channel (D) is connected to the atmospheric environment, so as to enable the driving mechanism (30) to exchange heat with air in the atmospheric environment.

2. The low-temperature cavitation venturi (100) according to claim 1, characterized in that: The driving mechanism (30) comprises a driving motor (31), a ball screw (32) and a coupling (33); The driving motor (31) comprises a motor tube body (311) and a motor shaft (312) extending out of the motor tube body (311); one end of the ball screw (32) is connected to the motor shaft (312) via the coupling (33), and the other end is connected to the valve core (20); and the ball screw (32) is used to convert the rotational motion of the driving motor (31) into the linear motion of the valve core (20), so as to drive the valve core (20) to reciprocate along the axial direction (C) of the fluid channel (A); The motor shaft (312) is formed with a first heat exchange channel (D1), the coupling (33) is formed with a second heat exchange channel (D2), and the ball screw (32) is formed with a third heat exchange channel (D3); the first heat exchange channel (D1), the second heat exchange channel (D2) and the third heat exchange channel (D3) are connected in sequence to form the heat exchange channel (D).

3. The low temperature cavitation venturi (100) according to claim 2, characterized in that: A first heating wire is embedded in the inner wall of the heat exchange channel (D) or a first heating wire is arranged inside the heat exchange channel (D), and the first heating wire is used to connect to an external power source; and / or The first heat exchange channel (D1) is provided with a first inlet (D11) and a second inlet (D12) arranged opposite to each other along its radial direction; the first inlet (D11) and the second inlet (D12) are connected to the atmosphere; and the outlet end of the third heat exchange channel (D3) is connected to the atmosphere.

4. The low temperature cavitation venturi (100) according to claim 2, characterized in that: The driving mechanism (30) further comprises a mounting frame (34), wherein the mounting frame (34) is located between the motor tube body (311) and the tube body assembly (10) in the axial direction (C); The mounting frame (34) comprises a main body (341) and a plurality of first heat exchange fins (342) arranged outside the main body (341), the plurality of first heat exchange fins (342) being arranged at intervals along the axial direction (C), and the plurality of first heat exchange fins (342) and the main body (341) together form a mounting cavity (E); The installation cavity (E) is in communication with the atmosphere through a gap between two adjacent first heat exchange fins (342), and the heat exchange channel (D) is located in the installation cavity (E).

5. The low temperature cavitation venturi (100) according to claim 4, characterized in that: The main body (341) includes a plurality of support rods (3411), a first connecting member (3412) and a second connecting member (3413); A plurality of the support rods (3411) are arranged at intervals along the circumference of the mounting frame (34), and each of the first heat exchange fins (342) is connected to the plurality of the support rods (3411) in the circumferential direction; The first connecting member (3412) and the second connecting member (3413) are located at both ends of the plurality of support rods (3411) in the axial direction (C) and are spaced apart from the corresponding first heat exchange fins (342); the first connecting member (3412) abuts against the motor tube body (311), and the second connecting member (3413) abuts against the tube body assembly (10).

6. The low temperature cavitation venturi (100) according to claim 4, characterized in that: The pipe body assembly (10) comprises a main pipe body (11), an inlet end pipe body (12) and an outlet end pipe body (13): The main pipe body (11) is formed with a first connecting channel (A2), the inlet end pipe body (12) is mounted on the main pipe body (11) and is formed with a first liquid inlet channel (A1), the outlet end pipe body (13) is mounted on the main pipe body (11) and is formed with a first liquid outlet channel (A3), and the first liquid inlet channel (A1), the first connecting channel (A2) and the first liquid outlet channel (A3) are sequentially connected to form the fluid channel (A); The main pipe (11) abuts against the mounting frame (34) in the axial direction (C), and a plurality of second heat exchange fins (111) arranged at intervals are arranged outside one end of the main pipe (11) close to the mounting frame (34).

7. The low temperature cavitation venturi (100) according to claim 6, characterized in that: A second heating wire (T1) is wound around the first heat exchange fin (341) and / or a third heating wire (T2) is wound around the second heat exchange fin (111), and the second heating wire (T1) and the third heating wire (T2) are used to be connected to an external power source.

8. The low temperature cavitation venturi (100) according to claim 6, characterized in that: The low-temperature cavitation venturi (100) further comprises a sealing component (50), wherein the sealing component (50) comprises a sealing connection piece (51) and an elastic sealing piece (52), wherein the sealing connection piece (51) is arranged between the valve core (20) and the main pipe body (11), and the elastic sealing piece (52) is arranged between the sealing connection piece (51) and the valve core (20), and the elastic sealing piece (52) is a metal spring energy storage sealing ring; and / or The first liquid outlet channel (A3) comprises a contraction section flow channel (A31), a throat flow channel (A32) and an expansion section flow channel (A33) which are sequentially connected along the axial direction (C); the contraction section flow channel (A31) is located on a side of the throat flow channel (A32) close to the first connecting channel (A2) in the axial direction (C); and / or The driving mechanism (30) further comprises: a connecting piece (35) for connecting the ball screw (32) to the valve core (20); A limit connecting member (36) is connected to the adapter (35) and the valve core (20); a limit bearing (37) is arranged on the limit connecting member (36); and a limit optical axis (38) is arranged on the mounting frame (34) and is arranged opposite to the limit bearing (37), and the limit optical axis (38) is used to abut against the limit bearing (37) to limit the movement of the limit bearing (37) in the axial direction (C).

9. The low-temperature cavitation venturi (100) according to claim 6, characterized in that: The main pipe body (11) is further formed with a second liquid outlet channel (B3), the outlet end pipe body (13) is further formed with a second connecting channel (B2), the outlet end pipe body (13) and the main pipe body (11) together form a second liquid inlet channel (B1), the second liquid inlet channel (B1) is communicated with the first connecting channel (A2), and the second connecting channel (B2) is arranged on at least part of the outer wall of the first liquid outlet channel (A3); The second liquid inlet channel (B1), the second connecting channel (B2) and the second liquid outlet channel (B3) are connected in sequence to form a cooling channel (B), and the outlet end of the second liquid outlet channel (B3) is used to communicate with the atmospheric environment.

10. The low temperature cavitation venturi (100) according to claim 9, characterized in that: The second liquid outlet channel (B3) comprises a mounting section (B31), a regulating section (B32) and a discharge section (B33) which are connected to each other, and the outlet end of the discharge section (B33) is used to communicate with the atmospheric environment; The low-temperature cavitation venturi also includes an adjusting component (40), the adjusting component (40) is connected to the mounting section (B31), and a portion of the adjusting component (40) and an inner wall of the adjusting section (B32) form a second gap with an adjustable opening to adjust the flow rate of the fluid entering the discharge section (B33).

11. The low temperature cavitation venturi (100) according to claim 10, characterized in that: The adjusting component (40) and the main pipe (11) are made of materials with different expansion rates, and the expansion degree of the main pipe (11) under the action of the temperature difference between the main pipe and the fluid is greater than the expansion degree of the adjusting component (40) under the action of the temperature difference between the main pipe and the fluid, so as to adjust the opening of the second gap formed by the adjusting component (40) and the inner wall of the adjusting section (B32); or The adjusting component (40) comprises an adjusting screw (41), wherein the adjusting screw (41) comprises a connecting section (411) and a matching section (412), wherein the connecting section (411) is threadedly connected to the inner wall of the mounting section (B31), at least a portion of the matching section (412) is formed as a conical structure, and the connecting section (411) is configured to be able to move relative to the mounting section (B31) under the action of an external force, so that different portions of the matching section (412) can enclose the second gap with the inner wall of the adjusting section (B32).

12. A cryogenic rocket engine system, characterized in that: It comprises a rocket engine and the cryogenic cavitation venturi (100) as described in any one of claims 1 to 11, wherein the cryogenic cavitation venturi (100) is capable of regulating the flow of fluid entering the rocket engine.

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