Pintle injector and rocket propulsion system

Abstract

The present invention relates to the field of rocket technology, and in particular to a pintle injector and a rocket power device. The pintle injector includes a pintle head, a housing, a first magnetic component, and a second magnetic component. The housing is provided with an intermediate chamber, a fuel chamber, and a combustion chamber. The intermediate chamber, the fuel chamber, and the combustion chamber are connected in sequence through a pintle channel. The pintle head is disposed in the pintle channel, and the discharge port of the pintle head is located in the combustion chamber. The first magnetic component is disposed on the pintle head and is located in the intermediate chamber. The second magnetic component is disposed in the intermediate chamber. The second magnetic component is suitable for driving the first magnetic component to move in the intermediate chamber along the extension direction of the pintle channel to change the size of the gap between the inner wall of the pintle channel connecting the fuel chamber and the combustion chamber and the outer wall of the pintle head. The adjustment mechanism setting of the pintle injector is simplified, and the mechanical actuator for adjusting the pintle is omitted in the power device system setting. While ensuring flexible adjustment of the fuel flow rate and flow rate entering the combustion chamber, the overall structure of the device is simplified and integrated, with a simple structure and reduced costs.

Description

Technical Field

[0001] The present invention relates to the field of rocket technology, in particular to a pintle injector and a rocket power device. Background Art

[0002] With the booming development of China's commercial aerospace sector, liquid oxygen-kerosene-fueled rocket propulsion systems have become a primary choice for liquid rocket propulsion systems. Currently, mainstream liquid rocket propulsion systems often utilize a wide range of variable thrust as a primary design characteristic. Pintle injectors are a rare injector design capable of adapting to a wide range of operating conditions, and are therefore widely used in various liquid rocket propulsion systems with a wide range of variable thrust.

[0003] Existing pintle injectors are mostly fixed-pintle models, where variable thrust is achieved by adjusting pipeline flow through a valve. This model maintains a constant flow area, but the injection flow resistance varies greatly. This requires the design of pressure-related components such as pumps, pipelines, and throttling elements to accommodate a wide range of pressures, increasing design and production difficulties.

[0004] Existing adjustable pintle propulsion systems mostly adjust thrust in two ways. The first is to change the propulsion system thrust by directly adjusting the flow rate of the main pipeline or gas line. This will result in a decrease in the injection pressure drop while the flow area of the pintle injector remains unchanged, which in turn leads to poor propellant mixing and atomization effect and reduced combustion efficiency. The second method is to add an adjustment mechanism and an adjustable pintle head to adjust the flow area of the pintle injector outlet to achieve the effect of adjusting the injection pressure drop. Although this method ensures the propulsion performance of the power unit, it introduces a complex adjustment mechanism, further increasing the overall complexity of the power unit on the basis of the two regulating valves and actuators, and posing a significant challenge to the overall design layout of the power unit. Summary of the Invention

[0005] The present invention provides a pintle injector and a rocket propulsion device to solve one of the defects in the prior art. The present invention drives the pintle head to move by cooperating with the first magnetic part and the second magnetic part, thereby simplifying the adjustment mechanism setting of the existing adjustable pintle injector and eliminating the mechanical actuator for adjusting the pintle in the power device system setting. While ensuring flexible adjustment of the fuel flow and flow rate entering the combustion chamber, the overall structure of the device is simplified and integrated, the structure is simple, and the cost is reduced.

[0006] The present invention provides a needle bolt injector, comprising a needle bolt head, a shell, a first magnetic component and a second magnetic component, wherein an intermediate cavity, a fuel cavity and a combustion cavity are provided in the shell, and the intermediate cavity, the fuel cavity and the combustion cavity are connected in sequence through a needle bolt channel, the needle bolt head is arranged in the needle bolt channel, and the discharge port of the needle bolt head is located in the combustion chamber, the first magnetic component is arranged on the needle bolt head and located in the intermediate cavity, the second magnetic component is arranged in the intermediate cavity, and the second magnetic component is suitable for driving the first magnetic component to move in the intermediate cavity along the extension direction of the needle bolt channel to change the size of the gap between the inner wall of the needle bolt channel connecting the fuel cavity and the combustion chamber and the outer wall of the needle bolt head.

[0007] According to a pintle injector provided by the present invention, the magnitude of the current received by the second magnetic member is positively correlated with the rotational speed of the turbo pump.

[0008] According to a pintle injector provided by the present invention, there are two second magnetic members, and the two second magnetic members are located on both sides of the first magnetic member.

[0009] According to a needle bolt injector provided by the present invention, the outer shell includes a first shell, a second shell and a third shell, the first shell encloses the intermediate cavity, the second shell encloses the fuel cavity, the third shell encloses the combustion cavity, the second shell is provided with a first through hole, and the first through hole is dynamically sealed with the needle bolt head.

[0010] According to a pintle injector provided by the present invention, an oxygen chamber is provided in the shell, the oxygen chamber, the intermediate chamber, the fuel chamber and the combustion chamber are connected in sequence through the pintle channel, and the feed port of the pintle head is located in the oxygen chamber.

[0011] According to a pintle injector provided by the present invention, the housing includes a fourth shell, the fourth shell encloses the oxygen chamber, the fourth shell is provided with a second through hole, and the second through hole is dynamically sealed with the pintle head.

[0012] According to the pintle injector provided by the present invention, the first shell is provided with reinforcing ribs.

[0013] According to a needle bolt injector provided by the present invention, the second shell is provided with a third through hole, the gap is formed between the third through hole and the needle bolt head, the outer side surface of the needle bolt head includes a slope, and the slope gradually tilts toward the inside of the needle bolt head along the direction from the fuel chamber to the combustion chamber.

[0014] According to the pintle injector provided by the present invention, the first magnetic component is a permanent magnet.

[0015] The present invention also provides a rocket propulsion device, comprising a power generation device and the pintle injector as described above, wherein the second magnetic member is connected to the power generation device.

[0016] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0017] The pintle injector according to an embodiment of the present invention primarily comprises a pintle head, a housing, a first magnetic member, and a second magnetic member. The housing and pintle head constitute the main body of the pintle injector, while the first and second magnetic members constitute the driving portion of the pintle head. An intermediate chamber, a fuel chamber, and a combustion chamber are sequentially arranged within the housing, and a pintle passage connects the intermediate chamber, the fuel chamber, and the combustion chamber. The pintle head is disposed within the pintle passage, and its axial direction extends along the axial direction of the pintle passage, i.e., the pintle head passes through the intermediate chamber and the fuel chamber and enters the combustion chamber.

[0018] The first magnetic member and the second magnetic member are both located in the middle cavity. The first magnetic member is integrally connected to the needle bolt head. The second magnetic member is arranged on one side of the first magnetic member along the axial direction of the needle bolt channel. When the magnetic force of the second magnetic member changes, it will generate a magnetic force on the first magnetic member, attracting or repelling the first magnetic member. The first magnetic member can approach or move away from the second magnetic member, thereby driving the needle bolt head to move back and forth along the needle bolt channel.

[0019] A gap exists between the inner wall of the pintle channel within the combustion chamber and the outer wall of the pintle head. As the pintle head reciprocates along the pintle channel, the gap increases or decreases. Oxidant enters the channel inside the pintle head through the inlet port of the pintle head and is then ejected into the combustion chamber through the outlet port of the pintle head. Fuel then flows from the fuel chamber through the gap and into the combustion chamber. This allows the oxidant and fuel to mix at the outlet port of the pintle head and then burn in the combustion chamber.

[0020] By adjusting the magnetic force of the second magnetic member, the present invention controls the movement distance and speed of the first magnetic member and the pintle head, thereby controlling the size of the gap between the inner wall of the combustion chamber and the outer wall of the pintle head, thereby controlling the flow of fuel entering the combustion chamber. By using the first and second magnetic members to cooperate and drive the pintle head, the present invention simplifies the adjustment mechanism of existing adjustable pintle injectors, eliminating the mechanical actuator for adjusting the pintle in the power system setup. While ensuring flexible adjustment of the fuel flow and flow rate entering the combustion chamber, the overall structure of the device is simplified and integrated, resulting in a simple structure and reduced costs.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is one of the structural schematic diagrams of the pintle injector provided by an embodiment of the present invention;

[0024] Figure 2 This is the second structural schematic diagram of the pintle injector provided in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 100, needle plug head; 110, discharge port; 120, feed port; 130, inclined surface;

[0027] 200, outer shell; 210, first shell; 211, middle cavity; 212, reinforcing rib; 220, second shell; 221, fuel cavity; 222, first through hole; 223, third through hole; 224, second feed port; 225, second discharge port; 230, third shell; 231, combustion cavity; 240, fourth shell; 241, oxygen cavity; 242, first feed port; 243, first discharge port; 244, second through hole;

[0028] 300. First magnetic component; 400. Second magnetic component; 500. Dynamic seal. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0034] like Figure 1 and Figure 2As shown, the needle bolt injector provided by the embodiment of the present invention includes a needle bolt head 100, a shell 200, a first magnetic component 300 and a second magnetic component 400. The shell 200 is provided with an intermediate cavity 211, a fuel cavity 221 and a combustion cavity 231. The intermediate cavity 211, the fuel cavity 221 and the combustion cavity 231 are connected in sequence through a needle bolt channel. The needle bolt head 100 is arranged in the needle bolt channel, and the discharge port 110 of the needle bolt head 100 is located in the combustion cavity 231. The first magnetic component 300 is arranged on the needle bolt head 100 and is located in the intermediate cavity 211. The second magnetic component 400 is arranged in the intermediate cavity 211. The second magnetic component 400 is suitable for driving the first magnetic component 300 to move in the intermediate cavity 211 along the extension direction of the needle bolt channel to change the size of the gap between the inner wall of the needle bolt channel connecting the fuel cavity 221 and the combustion cavity 231 and the outer wall of the needle bolt head 100.

[0035] The pintle injector according to an embodiment of the present invention primarily comprises a pintle head 100, a housing 200, a first magnetic member 300, and a second magnetic member 400. The housing 200 and the pintle head 100 constitute the main body of the pintle injector, while the first magnetic member 300 and the second magnetic member 400 constitute the driving portion of the pintle head 100. An intermediate chamber 211, a fuel chamber 221, and a combustion chamber 231 are sequentially disposed within the housing 200. These chambers are interconnected via a pintle passage. The pintle head 100 is disposed within the pintle passage, extending axially along the axial direction of the pintle passage, i.e., the pintle head 100 passes through the intermediate chamber 211 and the fuel chamber 221 and enters the combustion chamber 231.

[0036] The first magnetic member 300 and the second magnetic member 400 are both located in the middle cavity 211. The first magnetic member 300 is connected to the needle bolt head 100 as a whole. The second magnetic member 400 is arranged on one side of the first magnetic member 300 along the axial direction of the needle bolt channel. When the magnetic force of the second magnetic member 400 changes, it will generate a magnetic force on the first magnetic member 300, attracting or repelling the first magnetic member 300. The first magnetic member 300 can approach or move away from the second magnetic member 400, thereby driving the needle bolt head 100 to move back and forth along the needle bolt channel.

[0037] A gap exists between the inner wall of the pintle channel within the combustion chamber 231 and the outer wall of the pintle head 100. As the pintle head 100 reciprocates along the pintle channel, the gap increases or decreases. Oxidant enters the channel within the pintle head 100 through the inlet port 120 of the pintle head 100 and is then ejected into the combustion chamber 231 through the outlet port 110 of the pintle head 100. Fuel, on the other hand, passes through the gap from the fuel chamber 221 and is ejected into the combustion chamber 231. This allows the oxidant and fuel to mix at the outlet port 110 of the pintle head 100 and then burn in the combustion chamber 231.

[0038] By adjusting the magnetic force of the second magnetic member 400, the present invention can control the movement distance and speed of the first magnetic member 300 and the pintle head 100, thereby controlling the size of the gap between the inner wall of the combustion chamber 231 and the outer wall of the pintle head 100, thereby controlling the flow rate of fuel entering the combustion chamber 231. By driving the pintle head 100 to move in concert with the first magnetic member 300 and the second magnetic member 400, the present invention simplifies the adjustment mechanism of existing adjustable pintle injectors, eliminating the mechanical actuator for adjusting the pintle in the power plant system. While ensuring flexible adjustment of the fuel flow rate and flow rate entering the combustion chamber 231, the overall structure of the device is simplified and integrated, resulting in a simple structure and reduced costs.

[0039] According to one embodiment of the present invention, the magnitude of the current received by the second magnetic member 400 is positively correlated with the speed of the turbo pump. In this embodiment, the second magnetic member 400 can be connected to a power generation device to form an electromagnetic conversion device. When the current of the power generation device passes through the second magnetic member 400, the second magnetic member 400 generates an electromagnetic force that acts on the first magnetic member 300.

[0040] By transferring a portion of the turbopump's power and speed to an electromagnetic converter, the first magnetic member 300 of the pintle head 100 experiences a greater electromagnetic force at high turbopump speeds and a smaller electromagnetic force at low speeds. By varying the magnitude of the magnetic force, the first magnetic member 300 is driven to move, thereby adjusting the pintle head 100's position, changing the gap size and the fuel flow area flowing into the combustion chamber 231. This achieves the goal of synchronizing the pintle injector's fuel flow area with the turbopump's power, maintaining the powerplant's thrust performance, while minimizing the use of adjustment mechanisms and regulating valves. Compared to existing technologies, the pintle injector can be adjusted solely through the existing turbopump power regulation, simplifying the powerplant's structure and control strategy.

[0041] In this embodiment, the current received by the second magnetic component 400 is directly proportional to the rotational speed of the turbo pump. The proportional relationship can more accurately control the current. In other embodiments, the current received by the second magnetic component 400 can maintain a synchronous increasing and decreasing relationship with the rotational speed of the turbo pump, that is, the current increases as the rotational speed increases, and the current decreases as the rotational speed decreases.

[0042] According to one embodiment provided by the present invention, there are two second magnetic members 400, and the two second magnetic members 400 are located on both sides of the first magnetic member 300. In this embodiment, two second magnetic members 400 are disposed in the middle cavity 211, and the first magnetic member 300 is disposed between the two second magnetic members 400. As the electromagnetic force of the two second magnetic members 400 changes, the force on both sides of the first magnetic member 300 also changes, causing the first magnetic member 300 to move.

[0043] In this embodiment, the current size control of the two second magnetic parts 400 is achieved by changing the speed of the turbine pump. Under the action of the turbine pump, the two second magnetic parts can generate magnetic forces of the same magnitude and opposite directions, that is, one second magnetic part 400 generates an attractive force on the first magnetic part 300, and the other second magnetic part 400 generates a repulsive force on the first magnetic part 300, thereby driving the first magnetic part 300 to move. For the two second magnetic parts 400, the setting form of the same magnetic force size but different directions can be achieved by changing the winding direction of the coil.

[0044] The arrangement of the second magnetic members 400 on both sides can make the driving of the needle bolt head 100 more stable, and the movement adjustment of the needle bolt head 100 more sensitive and controllable. In other embodiments, other circuit elements can be added between the turbine pump and the second magnetic member 400. By changing the current conduction conditions of the two second magnetic members 400, the two second magnetic members 400 can generate relative electromagnetic forces, ensuring that the forces on both sides of the first magnetic member 300 are balanced and remain fixed and stable at the position they reach. The two second magnetic members 400 can be energized at the same time or not, and electromagnetic forces are applied in two directions of the first magnetic member 300 to control the reciprocating motion of the needle bolt head 100.

[0045] According to an embodiment provided by the present invention, the housing 200 includes a first shell 210, a second shell 220 and a third shell 230. The first shell 210 encloses an intermediate cavity 211, the second shell 220 encloses a fuel cavity 221, and the third shell 230 encloses a combustion cavity 231. The second shell 220 is provided with a first through hole 222, and the first through hole 222 is connected to the dynamic seal 500 of the needle bolt head 100.

[0046] In this embodiment, the shell 200 is composed of a first shell 210, a second shell 220 and a third shell 230. The interior of the first shell 210 is an intermediate cavity 211, the interior of the second shell 220 is a fuel cavity 221, and the interior of the third shell 230 is a combustion cavity 231. A first through hole 222 is provided on a side of the second shell 220 close to the third shell 230. The first through hole 222 is part of the needle bolt channel. The needle bolt head 100 passes through the intermediate cavity 211 and then enters the fuel cavity 221 through the first through hole 222.

[0047] A dynamic seal 500 is provided between the inner wall of the first through-hole 222 and the outer wall of the needle head 100. This seal ensures a seal between the needle head 100 and the second housing 220 during movement of the needle head 100 along the needle channel, while also ensuring the sealing of the second housing 220, preventing fuel leakage within the fuel chamber 221 and improving the sealing performance of the needle injector. In this embodiment, the first housing 210, the second housing 220, and the third housing 230 can also be integrally formed, thereby enhancing the overall structural strength of the needle injector.

[0048] According to one embodiment of the present invention, an oxygen chamber 241 is provided within the housing 200. The oxygen chamber 241, the intermediate chamber 211, the fuel chamber 221, and the combustion chamber 231 are sequentially connected via a pintle passage. The feed port 120 of the pintle head 100 is located within the oxygen chamber 241. In this embodiment, the housing 200 further includes an oxygen chamber 241, with the intermediate chamber 211 located between the oxygen chamber 241 and the fuel chamber 221. The feed port 120 of the pintle head 100 communicates with the oxygen chamber 241, passes through the intermediate chamber 211 and the fuel chamber 221, and finally communicates with the combustion chamber 231 through the discharge port 110. The pintle passage is constructed between the oxygen chamber 241, the intermediate chamber 211, the fuel chamber 221, and the combustion chamber 231. An oxidant flows within the oxygen chamber 241, entering the channel within the pintle head 100 through the feed port 120 and then being sprayed into the combustion chamber 231 through the discharge port 110.

[0049] In this embodiment, the pintle head 100 is completely located within the housing 200, and the housing 200 forms an oxygen chamber 241, an intermediate chamber 211, a fuel chamber 221, and a combustion chamber 231 along the pintle passage, further improving the integration and sealing effect of the pintle injector.

[0050] According to one embodiment of the present invention, the housing 200 includes a fourth shell 240, which encloses an oxygen chamber 241. The fourth shell 240 is provided with a second through-hole 244, which is connected to the dynamic seal 500 of the needle plug head 100. In this embodiment, the housing 200 is primarily composed of a first shell 210, a second shell 220, a third shell 230, and a fourth shell 240. The interior of the fourth shell 240 defines the oxygen chamber 241. A second through-hole 244 is provided on a side of the fourth shell 240 adjacent to the first shell 210. The second through-hole 244 forms part of the needle plug passage. The needle plug head 100 passes through the intermediate chamber 211 and then enters the oxygen chamber 241 through the second through-hole 244.

[0051] A dynamic seal 500 is provided between the inner wall of the second through hole 244 and the outer wall of the needle bolt head 100. When the needle bolt head 100 moves along the needle bolt channel, the sealing effect between the needle bolt head 100 and the fourth shell 240 can be ensured, and the sealing effect of the fourth shell 240 can be ensured at the same time, thereby avoiding leakage of the oxidant in the oxygen chamber 241 and improving the sealing performance of the needle bolt injector.

[0052] In this embodiment, the fourth shell 240, the first shell 210, the second shell 220, and the third shell 230 are fixedly connected in sequence along the extension direction of the pintle channel to form the outer shell 200. The inner surface of the third shell 230 is a Laval nozzle, which can maximize the conversion of ejected gas into thrust. One of the two second magnetic members 400 is disposed on the bottom surface of the fourth shell 240, and the other is disposed on the top surface of the second shell 220. The fourth shell 240 is provided with a first feed port 242 and a first discharge port 243 for the oxidant to enter and exit the oxygen chamber 241. The second shell 220 is provided with a second feed port 224 and a second discharge port 225 for the fuel to enter and exit the fuel chamber 221.

[0053] According to one embodiment provided by the present invention, the first shell 210 is provided with reinforcing ribs 212. In this embodiment, the first shell 210 is provided with reinforcing ribs 212 arranged circumferentially. The upper surface of the first shell 210 is welded to the bottom surface of the fourth shell 240, and the lower surface of the first shell 210 is welded to the upper surface of the second shell 220. The first shell 210 serves as a connecting structure between the oxygen chamber 241 and the fuel chamber 221. To ensure the structural strength of this position and provide a stable space for the up and down movement of the first magnetic member, the reinforcing ribs 212 are provided on the first shell 210 to improve the structural strength.

[0054] According to one embodiment of the present invention, the second housing 220 is provided with a third through-hole 223, forming a gap between the third through-hole 223 and the needle head 100. The outer side of the needle head 100 includes a sloped surface 130, which gradually slopes toward the interior of the needle head 100 along the direction from the fuel chamber 221 to the combustion chamber 231. In this embodiment, the third through-hole 223 is provided on the side of the second housing 220 near the third housing 230. The needle head 100 passes through the fuel chamber 221 and enters the combustion chamber 231 through the third through-hole 223. The gap between the inner wall of the third through-hole 223 and the outer wall of the needle head 100 forms an annular gap, through which fuel is injected from the fuel chamber 221 into the combustion chamber 231. The sloped surface 130 on the outer side of the needle head 100 gives the needle head 100 a converging shape. As the sloped surface 130 moves within the third through-hole 223, the size of the gap changes.

[0055] In this embodiment, the needle bolt head 100 is arranged vertically, and the feed port 120 is located above the discharge port 110. When the needle bolt head 100 moves upward, the gap between the inclined surface 130 and the third through hole 223 gradually increases. When the needle bolt head 100 moves downward, the gap between the inclined surface 130 and the third through hole 223 gradually decreases.

[0056] In this embodiment, the second through hole 244 of the fourth housing 240, the intermediate cavity 211 of the first housing 210, and the first through hole 222 of the second housing 220, the fuel cavity 221, and the third through hole 223 of the second housing 220 collectively form the pintle passage. The feed port 120 of the pintle head 100 is always located within the oxygen cavity 241, and the discharge port 110 is always located within the combustion cavity 231. The fuel cavity 221 has a liquid inlet. The oxidant enters through a circle of circular holes at the upper end of the pintle head 100 and is ejected through a circle of small holes at the lower end. The fuel is ejected through the annular gap formed between the pintle head 100 and the fuel cavity 221.

[0057] According to one embodiment of the present invention, the first magnetic member 300 is a permanent magnet. In this embodiment, the first magnetic member 300 is a permanent magnet. A permanent magnet is inherently magnetic, and even when the second magnetic member 400 is not powered, it can generate a magnetic force between the first magnetic member 300 and the second magnetic member 400, allowing the moved permanent magnet to return to its original position without requiring any additional structure to assist in resetting the first magnetic member 300.

[0058] The rocket power device provided by the present invention is described below. The rocket power device described below and the pintle injector described above can be referenced to each other.

[0059] An embodiment of the present invention further provides a rocket propulsion device, comprising a power generation device and a pintle injector as in the above embodiment, wherein the second magnetic member 400 is connected to the power generation device.

[0060] In the rocket propulsion device of the embodiment of the present invention, the oxidizer and fuel are pressurized by the turbopump to enter the oxygen chamber 241 and the fuel chamber 221 respectively, and the second magnetic component 400 is connected to the rotating power generation device. The rotating power generation device is configured so that the magnitude of the current generated by it is directly proportional to the rotational speed of the turbopump. The magnitude of the current received by the second magnetic component 400 is directly proportional to the rotational speed of the turbopump, thereby generating a current that varies with the rotational speed of the turbopump, thereby achieving the purpose of causing the magnetic force of the second magnetic component 400 to change simultaneously with the rotational speed of the turbopump.

[0061] Under high operating conditions, the turbopump speed is high, and the overall flow rate of the power unit is large. At this time, the current in the second magnetic member 400 is large, and the magnetic force is large. Due to the repulsive force, the pintle head 100 moves upward, thereby increasing the gap between the pintle head 100 and the third through-hole 223. Under low operating conditions, the turbopump speed is low, and the overall flow rate of the power unit is small. At this time, the current in the second magnetic member 400 is small, and the magnetic force is small. Due to the repulsive force, the pintle head 100 moves downward, thereby decreasing the gap between the pintle head 100 and the third through-hole 223.

[0062] In other embodiments, the turbine pump may be replaced by an electric pump, and the power generation device may be directly connected in parallel with the electric pump to achieve the purpose of varying the generated current with the pump power.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pintle injector, characterized in that: The invention comprises a needle bolt head, a shell, a first magnetic member and a second magnetic member, wherein an oxygen chamber, an intermediate chamber, a fuel chamber and a combustion chamber are provided in the shell, wherein the oxygen chamber, the intermediate chamber, the fuel chamber and the combustion chamber are connected in sequence through a needle bolt channel, the needle bolt head is arranged in the needle bolt channel, the feed port of the needle bolt head is located in the oxygen chamber, and the discharge port of the needle bolt head is located in the combustion chamber, the first magnetic member is arranged on the needle bolt head and is located in the intermediate chamber, the second magnetic member is arranged in the intermediate chamber, and the second magnetic member is suitable for driving the first magnetic member to move in the intermediate chamber along the extension direction of the needle bolt channel to change the size of the gap between the inner wall of the needle bolt channel connecting the fuel chamber and the combustion chamber and the outer wall of the needle bolt head; the shell comprises a first shell , a second shell and a third shell, the first shell encloses the intermediate cavity, the second shell encloses the fuel cavity, the third shell encloses the combustion cavity, the second shell is provided with a third through hole, the gap is formed between the third through hole and the needle bolt head, the outer side surface of the needle bolt head includes an inclined surface, and the inclined surface gradually inclines toward the inside of the needle bolt head along the direction from the fuel cavity to the combustion cavity; the second magnetic part can be connected to the power generation device to form an electromagnetic conversion device, when the current of the power generation device passes through the second magnetic part, the second magnetic part generates electromagnetic force, acts on the first magnetic part, and transfers part of the power and speed of the turbine pump to the electromagnetic conversion device, and the magnitude of the current received by the second magnetic part is positively correlated with the speed of the turbine pump.

2. The pintle injector according to claim 1, wherein: There are two second magnetic members, and the two second magnetic members are located on both sides of the first magnetic member.

3. The pintle injector according to claim 1, wherein: The second shell is provided with a first through hole, and the first through hole is dynamically sealedly connected to the pintle head.

4. The pintle injector according to claim 1, wherein: The housing includes a fourth shell, the fourth shell encloses the oxygen chamber, the fourth shell is provided with a second through hole, and the second through hole is dynamically sealed with the needle bolt head.

5. The pintle injector according to claim 3, characterized in that The first shell is provided with reinforcing ribs.

6. The pintle injector according to any one of claims 1 to 5, characterized in that: The first magnetic component is a permanent magnet.

7. A rocket propulsion device, characterized in that: The invention comprises a power generation device and the pintle injector according to any one of claims 1 to 6.

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