Liquid rocket engine jet pre-pump device with adjustable area ratio

Abstract

The application discloses an area ratio adjustable liquid rocket engine jet pre-press pump device and relates to the field of fluid machines. The jet pre-press pump device comprises a jet pre-press pump body, which comprises a suction chamber; an ejector assembly arranged on one side of the jet pre-press pump body, wherein the liquid outlet of the ejector assembly is in communication with the inside of the suction chamber; a flow limiting assembly arranged in the liquid outlet; and an adjusting assembly connected with the flow limiting assembly, which is used for adjusting the flow passage area of the flow limiting assembly covering the liquid outlet. The flow limiting assembly is arranged at the liquid outlet between the ejector assembly and the suction chamber, covers the liquid outlet, and is moved by the adjusting assembly, so that the area of the flow limiting assembly covering the liquid outlet is changed, the flow of the ejecting fluid can be adjusted, and the inlet pressure and the flow of the main pump can be adjusted according to requirements.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery, and in particular to a liquid rocket engine jet preload pump device with adjustable area ratio. Background Technology

[0002] Liquid rocket engines typically require main pumps to operate at high inlet pressures to ensure sufficient net positive suction head (NPSH). Pre-pressurization pumps are commonly used to pre-pressurize the fluid medium. Pre-pressurization pumps come in various forms. Some pre-pressurization pumps introduce high-pressure fluid from the system to drive a turbine, which in turn powers the pump; this type has a more complex structure. Jet pumps can also be used as pre-pressurization pumps for liquid rocket engines. Commonly used jet pumps are divided into center jet pumps and annular jet pumps, differing in the nozzle placement.

[0003] However, most existing annular jet pumps are designed with several nozzles circumferentially distributed, resulting in poor internal flow axisymmetry. This leads to deterioration of the internal flow, poor performance, and low efficiency. Furthermore, the area ratio of jet pumps is usually not adjustable, making it impossible to regulate the flow rate of the ejector fluid or adjust the inlet pressure and flow rate of the main pump as needed. Summary of the Invention

[0004] In view of the deficiencies in the existing technology, the technical problem solved by the present invention is: how to adjust the flow rate of the ejector fluid.

[0005] To achieve the above objectives, the present invention provides a liquid rocket engine jet preload pump device with adjustable area ratio, comprising:

[0006] The main body of the jet preload pump includes a suction chamber;

[0007] The ejector assembly is located on one side of the jet pre-pressurization pump body, and the outlet of the ejector assembly is connected to the interior of the suction chamber;

[0008] A flow-limiting component is located inside the liquid outlet;

[0009] An adjustment component, which is connected to a flow-limiting component, is used to adjust the flow area covered by the flow-limiting component at the outlet.

[0010] In one embodiment, the current limiting component includes adjustable blades and connectors that are interconnected;

[0011] The adjustment component is connected to the connector and is used to drive the connector to rotate, so as to adjust the flow area of ​​the adjustable blade covering the liquid outlet.

[0012] In one embodiment, the ejector assembly is a volute-type water inlet chamber, which is arranged around the periphery of the jet pre-pressurization pump body, and an outlet is arranged around the suction chamber and the ejector assembly.

[0013] In one embodiment, the adjustable blade and the connecting member are directly connected via a bevel gear shaft;

[0014] The bevel gear shaft passes through the ejector assembly;

[0015] The regulating components include a motor, a motor shaft end gear, an annular toothed belt, and a bevel gear, with the annular toothed belt surrounding the main body of the jet preload pump;

[0016] The connector is fixed to the bevel gear;

[0017] The bevel gear meshes with the annular toothed belt;

[0018] The motor meshes with a ring toothed belt via a gear at the motor shaft end, and is used to drive the ring toothed belt to rotate around its own axis.

[0019] In one embodiment, the liquid outlet is provided with multiple outlets, and each outlet is provided with a corresponding flow limiting component.

[0020] In one embodiment, a bushing is provided between the annular toothed belt and the jet preload pump body.

[0021] In one embodiment, a housing is provided around the current limiting component and the regulating component to isolate the current limiting component and the regulating component from the external space.

[0022] In one embodiment, the housing includes a first housing section and a second housing section, and the first housing section and the second housing section are connected by a flange.

[0023] In one embodiment, the jet pre-pressurization pump body further includes a main inlet pipe, a throat pipe, a diffuser, and an outlet straight pipe. The main inlet pipe is located at one end of the suction chamber, the other end of the suction chamber is connected to one end of the diffuser through the throat pipe, and the other end of the diffuser is connected to the outlet straight pipe.

[0024] In one embodiment, a flow straight pipe is provided inside the outlet straight pipe.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] This invention features an ejector assembly mounted on the main body of a jet pre-pressurization pump. The outlet of the ejector assembly is connected to the interior of the suction chamber, allowing ejected fluid to enter the main body of the jet pre-pressurization pump. A flow-limiting component, controlled by an adjusting component, is located at the outlet. Compared to existing jet pumps, this jet pre-pressurization pump, by placing a flow-limiting component at the outlet between the ejector assembly and the suction chamber, covers the outlet. The adjusting component moves the flow-limiting component, changing the area covered by the component at the outlet. A larger coverage area results in a smaller flow rate of the ejected fluid, and a smaller coverage area results in a larger flow rate. Therefore, the flow rate of the ejected fluid can be adjusted, thereby allowing for adjustment of the inlet pressure and flow rate of the main pump as needed. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the liquid rocket engine jet preload pump device with adjustable area ratio according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A sectional view;

[0029] Figure 3 This is a schematic diagram of the current limiting component according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the adjustment component according to an embodiment of the present invention.

[0031] In the diagram: 1-Main inlet pipe, 2-Ejector assembly, 3-Suction chamber, 4-Throat, 5-Diffuser, 6-Outlet straight pipe, 7-Flow limiting assembly, 701-Adjustable blade, 702-Bevel gear shaft, 703-Connector, 8-Bevel gear, 9-Bushing, 10-Annular toothed belt, 11-Motor, 12-Shaft end gear, 13-First section housing, 14-Second section housing, 15-Rectifying blade. Detailed Implementation

[0032] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The liquid rocket engine jet preload pump device with adjustable area ratio in the embodiments of the present invention is described in [reference needed]. Figure 1 , 2 As shown, the device includes a jet pre-pressurization pump body, which includes a suction chamber 3; an ejector assembly 2 is provided on one side of the jet pre-pressurization pump body, and the outlet of the ejector assembly 2 is connected to the interior of the suction chamber 3; a flow limiting assembly 7 is provided inside the outlet, and an adjustment assembly is connected to the flow limiting assembly 7, which is used to adjust the flow area of ​​the flow limiting assembly 7 covering the outlet.

[0034] Therefore, it can be seen that the present invention has an ejector assembly 2 installed on the main body of the jet pre-pressurization pump, and the outlet of the ejector assembly 2 is connected to the interior of the suction chamber 3. It is used to introduce the ejector fluid 2 into the interior of the jet pre-pressurization pump body, and a flow-limiting assembly 7 controlled by an adjusting assembly is provided at the outlet. Compared with the existing jet pump, this jet pre-pressurization pump provides a flow-limiting assembly 7 at the outlet between the ejector assembly 2 and the suction chamber 3. The flow-limiting assembly 7 covers the outlet, and the flow-limiting assembly 7 is moved by the adjusting assembly, thereby changing the area covered by the flow-limiting assembly 7 at the outlet. When the coverage area is larger, the flow rate of the ejector fluid is smaller, and when the coverage area is smaller, the flow rate of the ejector fluid is larger. Therefore, the flow rate of the ejector fluid can be adjusted, thereby adjusting the inlet pressure and flow rate of the main pump as needed.

[0035] Preferred, see Figure 3 As shown, the current limiting component 7 includes an adjustable blade 701 and a connector 703 that are connected to each other. The two are fixedly connected and will not move relative to each other.

[0036] The adjustment component is connected to the connector 703 and is used to drive the connector 703 to rotate, so as to adjust the flow area of ​​the adjustable blade 701 covering the liquid outlet.

[0037] Preferred, see Figure 2 , 3 As shown in Figure 4, a first specific structure is provided, wherein the ejector assembly 2 is a volute-type water inlet chamber, which is arranged around the periphery of the jet pre-pressurization pump body, and an outlet is arranged around the suction chamber 3 and the ejector assembly 2.

[0038] Furthermore, the adjustable blade 701 and the connecting member 703 are directly connected via the bevel gear shaft 702;

[0039] The bevel gear shaft 702 is inserted through the ejector assembly 2, and the bevel gear shaft 702 is rotatably connected to the wall of the ejector assembly 2;

[0040] The adjustment assembly includes a motor 11, a motor shaft end gear 12, an annular toothed belt 10, and a bevel gear 8. The annular toothed belt 10 is arranged around the body of the jet preload pump. The annular toothed belt 10 can be a complete circle or a section that is wrapped around the body of the jet preload pump.

[0041] It should be noted that the design of the annular toothed belt 10 must satisfy the rotation of the bevel gear 8;

[0042] The connector 703 is fixed to the bevel gear 8, and the connector 703 and the bevel gear 8 are assembled and fitted together to transmit torque.

[0043] The bevel gear 8 meshes with the annular toothed belt 10;

[0044] The motor 11 meshes with the annular toothed belt 10 through the gear 12 at the end of the motor shaft, and is used to drive the annular toothed belt 10 to rotate around its own axis.

[0045] Furthermore, there may be one or more liquid outlets, and each liquid outlet is provided with a corresponding flow limiting component 7.

[0046] Preferred, see Figure 2 , 3 As shown in Figure 4, a second specific structure is provided. The adjustment component includes a motor 11, a motor shaft end gear 12, and a control gear. The motor 11 is connected to the motor shaft end gear 12, and the motor shaft end gear 12 is connected to the control gear. The control gear is fixedly connected to the current limiting component 7 to drive the current limiting component 7 to rotate.

[0047] Furthermore, the ejector assembly 2 is a volute-type water inlet chamber, which is arranged around the periphery of the jet pre-pressurization pump body, and several liquid outlets are arranged around the suction chamber 3 and the ejector assembly 2.

[0048] Furthermore, the control gear includes an annular toothed belt 10 and bevel gears 8. The annular toothed belt 10 is arranged around the body of the jet pre-pressurization pump, and several bevel gears 8 are arranged on the annular toothed belt 10. Each bevel gear 8 is connected to a flow limiting component 7. The flow limiting component 7 also includes a bevel gear shaft 702, which is arranged between the adjustable blade 701 and the connector 703. The bevel gears 8 are rotatably mounted on the wall of the ejector assembly 2 via the bevel gear shaft 702 on the flow limiting component 7. The distribution of the flow limiting component 7 matches the distribution of the liquid outlet.

[0049] Preferred, see Figure 2 As shown, a bushing 9 is provided between the annular toothed belt 10 and the main body of the jet preload pump.

[0050] It should be noted that both the annular toothed belt 10 and the main body of the jet preload pump are steel structures. To avoid friction between the steel structures and damage to both, a bushing 9 is provided between them for protection.

[0051] Preferred, see Figure 2 As shown, the current limiting component 7 and the regulating component are surrounded by a housing, which is used to isolate the current limiting component 7 and the regulating component from the external space.

[0052] It should be noted that the flow limiting component 7 is installed on the ejector component 2, and a part of it is located inside the ejector component 2. The ejector component 2 is also connected to the suction chamber 3. In order to ensure the sealing of the main body of the jet pre-pressure pump, a housing is provided around the flow limiting component 7 and the regulating component.

[0053] Further, see Figure 2As shown, a specific shell structure is provided, the shell including a first shell section 13 and a second shell section 14, and the first shell section 13 and the second shell section 14 are connected by a flange.

[0054] It should be noted that the housing is designed as a multi-segment structure, which facilitates the installation and disassembly of the housing, and the flange connection ensures a tight seal.

[0055] Preferred, see Figure 2 As shown, the main body of the jet preload pump also includes a main inlet pipe 1, a throat pipe 4, a diffuser 5, and an outlet straight pipe 6. The main inlet pipe 1 is located at one end of the suction chamber 3, and the other end of the suction chamber 3 is connected to one end of the diffuser 5 through the throat pipe 4. The other end of the diffuser 5 is connected to the outlet straight pipe 6.

[0056] Further, see Figure 2 As shown, the outlet straight pipe 6 is equipped with a flow straight blade 15.

[0057] It should be noted that the adjustable inlet blades allow for adjustment of the jet pump's area ratio, providing the main pump with variable inlet pressure and flow rate. Simultaneously, the incident angle of the ejected fluid can be adjusted to achieve better mixing. The outlet rectifier blades rectify the fluid at the jet pump's outlet, providing a pre-swirling inlet flow to the downstream main pump as required by the design.

[0058] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A liquid rocket engine jet preload pump device with adjustable area ratio, characterized in that, It includes: The main body of the jet preload pump includes a suction chamber (3); The ejector assembly (2) is located on one side of the jet pre-pressurization pump body, and the outlet of the ejector assembly (2) is connected to the interior of the suction chamber (3); A flow-limiting component (7) is disposed inside the liquid outlet; An adjustment component, which is connected to the flow limiting component (7), is used to adjust the flow area of ​​the flow limiting component (7) covering the outlet; The current limiting component (7) includes an adjustable blade (701) and a connector (703) that are connected to each other. The adjustment component is connected to the connector (703) and is used to drive the connector (703) to rotate so as to adjust the flow area of ​​the adjustable blade (701) covering the liquid outlet. The ejector assembly (2) is a volute-type water inlet chamber, which is arranged around the periphery of the jet pre-pressurization pump body. An outlet is arranged around the suction chamber (3) and the ejector assembly (2). The adjustable blade (701) and the connector (703) are directly connected through the bevel gear shaft (702); The bevel gear shaft (702) passes through the ejector assembly (2); The adjustment assembly includes a motor (11), a motor shaft end gear (12), an annular toothed belt (10), and a bevel gear (8). The annular toothed belt (10) is arranged around the body of the jet preload pump. The connector (703) is fixed to the bevel gear (8); The bevel gear (8) meshes with the annular toothed belt (10); The motor (11) meshes with the annular toothed belt (10) through the gear (12) at the end of the motor shaft and is used to drive the annular toothed belt (10) to rotate around its own axis.

2. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 1, characterized in that: The liquid outlet is provided in multiple ways, and each liquid outlet is provided with a corresponding flow limiting component (7).

3. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 1, characterized in that: A bushing (9) is provided between the annular toothed belt (10) and the main body of the jet preload pump.

4. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 1, characterized in that: The current limiting component (7) and the regulating component are surrounded by a housing, which is used to isolate the current limiting component (7) and the regulating component from the external space.

5. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 4, characterized in that: The housing includes a first housing section (13) and a second housing section (14), and the first housing section (13) and the second housing section (14) are connected by a flange.

6. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 1, characterized in that: The main body of the jet pre-pressurization pump also includes a main inlet pipe (1), a throat pipe (4), a diffuser (5) and an outlet straight pipe (6). The main inlet pipe (1) is located at one end of the suction chamber (3). The other end of the suction chamber (3) is connected to one end of the diffuser (5) through the throat pipe (4). The other end of the diffuser (5) is connected to the outlet straight pipe (6).

7. The liquid rocket engine jet preload pump device with adjustable area ratio as described in claim 6, characterized in that: The outlet straight pipe (6) is equipped with a flow straight blade (15).

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