Flow pulsation generator

Abstract

The utility model provides a flow pulsation generator, which relates to the technical field of simulated liquid rocket engines, and is characterized in that a plurality of circulation holes are formed in a pulsation wheel disc, and the circulation holes in the pulsation wheel disc periodically and completely face or are completely staggered with a liquid flow channel along with the rotation of the pulsation wheel disc; when the pulsating wheel disc rotates, the area of a fluid channel between the wheel disc through hole and the flow channel hole is changed, so that the flow in a liquid flowing channel generates oscillation according to the rule similar to sine; a gap is formed between the magnetic coupling driver and the pulsation wheel disc, transmission without mechanical contact is achieved, dynamic sealing is not needed, the whole structure only has a static sealing mode, the sealing performance and reliability of the structure under the high-pressure and low-temperature working conditions are effectively improved, and the service life of the structure is prolonged. The technical problem that in the prior art, a rotating part of a shaft of an existing wheel disc type flow pulsation generator is sealed in a dynamic mode, and the sealing effect is poor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of simulated liquid rocket engines, in particular to a flow pulsation generator. Background Art

[0002] When a liquid rocket engine is working, it is in a working condition of high flow rate, high temperature and high pressure, and is prone to unstable combustion problems. The occurrence of low-frequency unstable combustion problems is always related to the flow pulsation of the propellant in the propellant supply system and the supply pipeline. To study the dynamic characteristics of the propellant supply system, supply pipeline and propellant injector in a liquid rocket engine when unstable combustion occurs in the engine, it is necessary to artificially generate controllable flow pulsations in the experiment to simulate the flow pulsations generated in the actual operation of the liquid rocket engine. The liquid rocket engine is in a high-pressure environment during operation, and the high-pressure environment has an obvious impact on the dynamic characteristics of the supply system, supply pipeline and injector. At the same time, advanced liquid rocket engine propellants use cryogenic working fluids (such as liquid oxygen and liquid hydrogen). Therefore, when simulating the flow pulsation of a rocket engine, the high-pressure and low-temperature resistance capabilities of the equipment must be considered.

[0003] The existing disk-type flow pulsation generator drives a disk on a shaft to rotate through a motor. The through holes of the disk communicate or close with the liquid flow channels in the sleeve at a certain period to control the on-off of the liquid flow channels, and can generate flow pulsations that pulsate in an approximate sine law in the nozzle dynamic characteristic experiment under normal pressure.

[0004] However, for the existing disk-type flow pulsation generator, in order to realize the rotation of the disk, a direct drive method of the shaft is adopted, which requires the use of a dynamic seal at the rotating part of the shaft. In order to ensure the seal under high pressure, a very high seal preload is required, which directly causes the disk to heat seriously at high rotational speeds. This is very disadvantageous for cryogenic fluid working media, which will cause the cryogenic fluid working media to heat up or even vaporize, thus seriously affecting the experimental conditions. At the same time, the cryogenic fluid will also cause the sealing material to embrittle, resulting in the failure of the dynamic seal and leakage. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a flow pulsation generator to alleviate the technical problem that in the prior art, a dynamic seal is used at the rotating part of the shaft of the existing disk-type flow pulsation generator, and the sealing effect is not good.

[0006] The flow pulsation generator provided by the utility model includes: a housing assembly, a driving member, a magnetic coupling transmission and a pulsation disk;

[0007] The housing assembly has a liquid flow channel;

[0008] The pulsating disk is mounted on the housing assembly. The pulsating disk has a plurality of flow holes, and the pulsating disk is configured to block the liquid from flowing out of the liquid flow channel, or the liquid flow channel can communicate with one of the flow holes to allow the liquid to flow out of the liquid flow channel;

[0009] The driving member is in transmission connection with the magnetic coupling transmission. There is a spacing between the magnetic coupling transmission and the pulsating disk, and there is a magnetic force between the magnetic coupling transmission and the pulsating disk. The driving member is used to drive the magnetic coupling transmission to rotate, so that the magnetic coupling transmission drives the pulsating disk to rotate.

[0010] In an alternative embodiment,

[0011] The housing assembly includes an upper cover body and a lower cover body;

[0012] The upper cover body and the lower cover body are connected to each other;

[0013] The upper cover body has a placement groove recessed in a direction away from the lower cover body, and the pulsating disk is disposed in the placement groove.

[0014] In an alternative embodiment,

[0015] The upper cover body has an upper liquid channel, and the lower cover body has a lower liquid channel. The upper liquid channel can communicate with the lower liquid channel through the flow hole.

[0016] In an alternative embodiment,

[0017] The plurality of flow holes are evenly spaced along the circumferential direction of the pulsating disk.

[0018] In an alternative embodiment,

[0019] The flow pulsation generator further includes a plurality of magnets;

[0020] The plurality of magnets are evenly fixed on the pulsating disk along the circumferential direction of the pulsating disk, and there is a magnetic force between the plurality of magnets and the magnetic coupling transmission.

[0021] In an alternative embodiment,

[0022] The outer circumference of the pulsating disk is provided with an outer circumferential sealing groove in a thread shape, and the cross-sectional shape of the outer circumferential sealing groove is trapezoidal.

[0023] In an alternative embodiment,

[0024] End face sealing grooves are provided on one side of both the upper cover body and the lower cover body facing the pulsating disk.

[0025] In an alternative embodiment,

[0026] The flow pulsation generator also includes a motor fixing plate and a connecting member;

[0027] One end of the connecting member is connected to the motor fixing plate, and the other end of the connecting member is connected to the lower cover body. The motor fixing plate is used to install the driving member.

[0028] In an alternative embodiment,

[0029] The flow pulsation generator also includes an upper bearing and a lower bearing;

[0030] The pulsating wheel is connected to the upper cover body through the upper bearing;

[0031] The pulsating impeller is connected to the lower cover body through the lower bearing.

[0032] In an alternative embodiment,

[0033] A sealing ring is arranged between the upper cover body and the lower cover body.

[0034] The flow pulsation generator provided by the utility model has a plurality of flow holes arranged on a pulsating wheel. The flow holes on the pulsating wheel are periodically completely opposite to or completely offset from the liquid flow channel as the pulsating wheel rotates. The area of ​​the fluid channel between the wheel through hole and the flow channel hole changes, so that the flow in the liquid flow channel oscillates in an approximately sinusoidal law. In addition, since the driving component drives the magnetic coupling transmission to rotate, the magnetic coupling transmission drives the pulsating wheel together through the magnetic force, and there is a distance between the magnetic coupling transmission and the pulsating wheel, a mechanical contact-free transmission is realized, and there is no need to use a dynamic seal. The entire structure has only a static seal form, which effectively improves the sealing and reliability of the structure under high-pressure and low-temperature conditions, and alleviates the technical problem in the prior art that the existing wheel-type flow pulsation generator uses a dynamic seal at the rotating part of the shaft, and the sealing effect is not good. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of a quarter section structure of a flow pulsation generator provided in an embodiment of the utility model;

[0037] Figure 2 It is a cross-sectional view of the overall structure of the flow pulsation generator provided by the embodiment of the present utility model;

[0038] Figure 3 It is an exploded view of the overall structure of the flow pulsation generator provided by the embodiment of the present utility model;

[0039] Figure 4 It is a schematic diagram of the overall structure of the flow pulsation generator provided by the embodiment of the present utility model;

[0040] Figure 5 It is a schematic diagram of the structure of the upper cover main body of the flow pulsation generator provided by the embodiment of the present utility model;

[0041] Figure 6 It is a schematic diagram of the structure of the pulsation wheel disc of the flow pulsation generator provided by the embodiment of the present utility model.

[0042] Icon: 100 - housing assembly; 110 - upper cover main body; 111 - upper liquid channel; 112 - end face seal groove; 120 - lower cover main body; 121 - lower liquid channel; 200 - driving member; 300 - magnetic coupling drive; 400 - pulsation wheel disc; 410 - flow through hole; 420 - outer peripheral seal groove; 500 - magnet; 600 - motor fixing plate; 700 - connecting member; 810 - upper bearing; 811 - circlip; 820 - lower bearing; 900 - sealing ring. Specific embodiments

[0043] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0044] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.

[0047] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, the flow pulsation generator provided in this embodiment includes: a housing assembly 100, a driving member 200, a magnetic coupling transmission 300, and a pulsating wheel disc 400; the housing assembly 100 has a liquid flow channel; the pulsating wheel disc 400 is installed on the housing assembly 100, the pulsating wheel disc 400 has a plurality of flow holes 410, and the pulsating wheel disc 400 is configured to be able to block the liquid from flowing out of the liquid flow channel, or the liquid flow channel can communicate with one of the flow holes 410 so that the liquid flows out of the liquid flow channel.

[0048] Specifically, when the pulsating wheel disc 400 rotates to a position where the flow hole 410 is opposite to the liquid flow channel, the liquid in the liquid flow channel passes through the flow hole 410, and the liquid in the liquid flow channel can flow out. When the pulsating wheel disc 400 rotates to a position where the flow hole 410 is not opposite to the liquid flow channel, that is, a position where the flow hole 410 is misaligned with the liquid flow channel, the liquid in the liquid flow channel is blocked by the pulsating wheel disc 400, and the liquid in the liquid flow channel cannot flow out. By rotating the pulsating wheel disc 400, the liquid flow rate flowing out of the liquid flow channel oscillates approximately sinusoidally, and adjusting the rotation speed of the wheel disc can adjust the oscillation frequency.

[0049] The driving member 200 is in transmission connection with the magnetic coupling transmission 300. There is a distance between the magnetic coupling transmission 300 and the pulsating wheel disc 400, and there is a magnetic force between the magnetic coupling transmission 300 and the pulsating wheel disc 400. The driving member 200 is used to drive the magnetic coupling transmission 300 to rotate so that the magnetic coupling transmission 300 drives the pulsating wheel disc 400 to rotate.

[0050] The flow pulsation generator provided in this embodiment is provided with a plurality of flow holes 410 on the pulsating wheel 400. The flow holes 410 on the pulsating wheel 400 are periodically completely opposite to or completely offset from the liquid flow channel as the pulsating wheel 400 rotates. The fluid channel area between the wheel through hole and the flow channel hole changes, so that the flow in the liquid flow channel oscillates in an approximately sinusoidal law. In addition, since the driving component 200 drives the magnetic coupling transmission 300 to rotate, the magnetic coupling transmission 300 rotates together with the pulsating wheel 400 through the magnetic force. There is a distance between the magnetic coupling transmission 300 and the pulsating wheel 400, so that mechanical contact-free transmission is realized, and there is no need to use dynamic seals. The entire structure has only static sealing form, which effectively improves the sealing and reliability of the structure under high-pressure and low-temperature conditions, and alleviates the technical problem of the existing wheel-type flow pulsation generator in the prior art using dynamic seals at the rotating part of the shaft, and the poor sealing effect.

[0051] Regarding the structure and shape of the housing assembly 100, specifically:

[0052] like Figure 5 As shown, the shell assembly 100 includes an upper cover body 110 and a lower cover body 120; the upper cover body 110 and the lower cover body 120 are connected to each other; the upper cover body 110 has a placement groove arranged in a groove facing away from the lower cover body 120, and the pulsating wheel 400 is arranged in the placement groove, the upper cover body 110 has an upper liquid channel 111, and the lower cover body 120 has a lower liquid channel 121, and the upper liquid channel 111 and the lower liquid channel 121 are both connected to the placement groove, and when the pulsating wheel 400 rotates until the flow hole 410 is connected to the upper liquid channel 111 and the lower liquid channel 121, the upper liquid channel 111 can flow into the lower liquid channel 121 through the flow hole 410, and the flow rate is oscillated in an approximately sinusoidal law through the rotation of the pulsating wheel 400.

[0053] In an optional embodiment, the flow pulsation generator also includes an upper bearing 810 and a lower bearing 820; the pulsating wheel 400 is connected to the upper cover body 110 through the upper bearing 810; the pulsating wheel 400 is connected to the lower cover body 120 through the lower bearing 820. It should be noted that both the upper bearing 810 and the lower bearing 820 need to use low-temperature resistant bearings.

[0054] In addition, an elastic retaining ring 811 is provided on one side of the upper bearing 810 close to the lower shell, and the elastic retaining ring 811 effectively prevents the upper bearing 810 from axial movement.

[0055] In an alternative embodiment, end face seal grooves 112 are provided on the surfaces of the upper cover body 110 and the lower cover body 120 facing the pulsating disk 400. The end face seal grooves 112 are evenly distributed along the radial direction of the upper and lower covers. The provision of the end face seal grooves 112 forms a labyrinth seal in the placement groove to reduce the leakage of liquid flowing radially and circumferentially to the flow holes 410 on the pulsating disk 400 that are not directly opposite to the liquid flow channels.

[0056] In an alternative embodiment, a sealing ring 900 is provided between the upper cover body 110 and the lower cover body 120. The provision of the sealing ring 900 prevents the liquid in the placement groove from flowing out along the gap between the upper cover body 110 and the lower cover body 120.

[0057] Regarding the structure and shape of the pulsating disk 400, specifically:

[0058] As Figure 6 shown, a plurality of flow holes 410 are provided on the pulsating disk 400. The plurality of flow holes 410 are evenly spaced along the circumferential direction of the pulsating disk 400.

[0059] The flow pulsation generator further includes a plurality of magnets 500; the plurality of magnets 500 are evenly fixed on the pulsating disk 400 along the circumferential direction of the pulsating disk 400, and there is a magnetic force between the plurality of magnets 500 and the magnetic coupling drive 300.

[0060] Specifically, a magnet 500 array is inlaid on the pulsating disk 400. The magnetic coupling drive 300 and the magnet 500 array on the pulsating disk 400 are attracted by magnetic force, and the rotation of the magnetic coupling drive 300 is transmitted to the magnet 500 array on the pulsating disk 400 through the magnetic field. When the driving member 200 drives the magnetic coupling drive 300 to rotate, the magnet 500 array on the pulsating disk 400 rotates synchronously, realizing magnetic force transmission.

[0061] In an alternative embodiment, an outer peripheral seal groove 420 in a thread shape is provided on the outer circumference of the pulsating disk 400. The cross-sectional shape of the outer peripheral seal groove 420 is trapezoidal.

[0062] Specifically, there is a trapezoidal thread on the outside of the pulsating disk 400 as a labyrinth seal groove to reduce the axial leakage of liquid from the outside of the pulsating disk 400 and the housing assembly 100. The labyrinth seal groove in the form of a trapezoidal thread will produce an effect similar to that of a vane pump at high speeds to push the liquid to the high-pressure side, and the axial labyrinth seal effect on the outside of the pulsating disk 400 is enhanced as the speed increases.

[0063] In an alternative embodiment, the flow pulsation generator further includes a motor fixing plate 600 and a connecting member 700. The connecting member 700 is specifically configured as a hexagonal stud. One end of the connecting member 700 is connected to the motor fixing plate 600, and the other end of the connecting member 700 is connected to the lower cover body 120. The motor fixing plate 600 is connected to the lower cover body 120 through a plurality of connecting members 700. The motor fixing plate 600 is used to mount the driving member 200. The driving member 200 is specifically configured as a waterproof brushless motor. After the driving member 200 is installed, there is a gap between the magnetic coupling drive 300 and the lower cover body 120 to ensure normal rotation.

[0064] For the flow pulsation generator provided in this embodiment, the transmission between the pulsation disk 400 and the driving member 200 relies on the magnetic coupling drive 300, so that there is no rotating shaft in the structure that needs dynamic sealing. The entire structure only has a static sealing form, effectively improving the sealing performance and reliability of the structure under high-pressure and low-temperature conditions. A non-contact sealing form is used between the pulsation disk 400 and the housing assembly 100 to prevent the low-temperature liquid from absorbing heat and vaporizing due to friction. Arranging a trapezoidal-threaded labyrinth seal groove on the outer side of the pulsation disk 400 can ensure that the axial leakage of the liquid is significantly reduced at high speeds.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flow pulsation generator, characterized in that: include: A housing assembly (100), a driving member (200), a magnetic coupling transmission (300) and a pulsating wheel (400); The housing assembly (100) has a liquid flow channel; The pulsating wheel disc (400) is mounted on the housing assembly (100), and the pulsating wheel disc (400) has a plurality of flow holes (410). The pulsating wheel disc (400) is configured to be able to block the liquid from flowing out of the liquid flow channel, or the liquid flow channel can be connected to one of the flow holes (410) to allow the liquid to flow out of the liquid flow channel; The driving component (200) is in driving connection with the magnetic coupling transmission (300); there is a distance between the magnetic coupling transmission (300) and the pulsating wheel (400); and there is magnetic force between the magnetic coupling transmission (300) and the pulsating wheel (400); the driving component (200) is used to drive the magnetic coupling transmission (300) to rotate, so that the magnetic coupling transmission (300) drives the pulsating wheel (400) to rotate.

2. The flow pulsation generator according to claim 1, characterized in that: The housing assembly (100) comprises an upper cover body (110) and a lower cover body (120); The upper cover body (110) and the lower cover body (120) are connected to each other; The upper cover body (110) has a placement groove which is arranged in a groove facing away from the lower cover body (120), and the pulsating wheel (400) is arranged in the placement groove.

3. The flow pulsation generator according to claim 2, characterized in that: The upper cover body (110) has an upper liquid channel (111), and the lower cover body (120) has a lower liquid channel (121). The upper liquid channel (111) can be in communication with the lower liquid channel (121) through the flow hole (410).

4. The flow pulsation generator according to claim 3, characterized in that: The plurality of flow holes (410) are evenly spaced apart along the circumferential direction of the pulsating impeller (400).

5. The flow pulsation generator according to claim 4, characterized in that: The flow pulsation generator further comprises a plurality of magnets (500); The plurality of magnets (500) are evenly fixed on the pulsating disc (400) along the circumferential direction of the pulsating disc (400), and magnetic force exists between the plurality of magnets (500) and the magnetic coupling actuator (300).

6. The flow pulsation generator according to claim 2, characterized in that: The outer circumference of the pulsating impeller (400) is provided with a threaded outer circumferential sealing groove (420), and the cross-sectional shape of the outer circumferential sealing groove (420) is a trapezoid.

7. The flow pulsation generator according to claim 6, characterized in that: The upper cover body (110) and the lower cover body (120) are both provided with end surface sealing grooves (112) on one side facing the pulsating impeller (400).

8. The flow pulsation generator according to claim 2, characterized in that: The flow pulsation generator further comprises a motor fixing plate (600) and a connecting member (700); One end of the connecting member (700) is connected to the motor fixing plate (600), and the other end of the connecting member (700) is connected to the lower cover body (120). The motor fixing plate (600) is used to install the driving member (200).

9. The flow pulsation generator according to claim 2, characterized in that: The flow pulsation generator further comprises an upper bearing (810) and a lower bearing (820); The pulsating wheel (400) is connected to the upper cover body (110) via the upper bearing (810); The pulsating impeller (400) is connected to the lower cover body (120) via the lower bearing (820).

10. The flow pulsation generator according to claim 2, characterized in that: A sealing ring (900) is provided between the upper cover body (110) and the lower cover body (120).

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