A simplified structure of thermistorless hollow cathode thruster

Abstract

A simplified structure of a pyrogen-free hollow cathode thruster belongs to the field of aviation propulsion technology. This invention aims to solve the redundancy problem existing in the structure of existing pyrogen-free hollow cathode thrusters. In this application, the emitter is inserted into the closed end of the cathode tube, the outer shell is sleeved on the outside of the cathode tube, the bottom plate is sleeved on the outer wall of the open end of the cathode tube, the insulating ceramic base is sleeved on the outer wall of the cathode tube, the bottom plate is connected to one end of the outer shell through the insulating ceramic base, the magnetic shield is embedded in the inner wall of the other end of the outer shell, the insulating channel is embedded in the magnetic shield, the first permanent magnet is sleeved on the outside of the insulating channel, the second permanent magnet is embedded between the insulating channel and the magnetic shield, and the first and second permanent magnets are connected by the magnetic shield. When the cathode in the thruster is ignited, a voltage is applied to the magnetic shield, causing the magnetic shield to act as a touch-holding pole. This application is mainly used in cube satellites for orbit maintenance and elevation of cube satellites.

Description

Technical Field

[0001] The present invention belongs to the field of aviation propulsion technology, and in particular relates to a thermistorless hollow cathode thruster with a simplified structure. Background Art

[0002] Microsatellites are developing rapidly. Their small size, light weight, and low cost make them ideal for universities and research institutes, verifying technologies with on-orbit applications and conducting on-orbit experiments. They hold broad application prospects in low-Earth orbit observation, remote sensing, and low-Earth communications. Due to the increasing amount of satellite debris in Earth's space environment, which poses a serious threat to the safety of on-orbit satellites and space stations, both domestic and international regulations have mandated that satellites have the ability to deorbit. Therefore, microsatellites also need this capability.

[0003] Among the many current propulsion technologies, electric propulsion holds great promise due to its high specific impulse and long lifespan. Hall thrusters are the most mature type of electric propulsion technology. While miniaturization of Hall thrusters reduces the thruster size, the cathode is difficult to reduce. Consequently, proposals have been made to integrate the cathode and thruster, resulting in the hollow cathode thruster. However, this structure still suffers from redundancy, requiring further simplification.

[0004] Based on the above content, it is in line with practical needs to develop a simplified structure of thermistorless hollow cathode thruster to solve the redundancy problem existing in the structure of the existing thermistorless hollow cathode thruster. Summary of the Invention

[0005] The present invention aims to solve the redundancy problem existing in the structure of the existing athermal hollow cathode thruster, and further provides a athermal hollow cathode thruster with a simplified structure;

[0006] A simplified structure of a thermistorless hollow cathode thruster includes a base plate, an insulating ceramic base, an outer shell, an anode, an insulating channel, a No. 1 permanent magnet, a No. 2 permanent magnet, an emitter, a cathode tube, and a magnetic shield. The emitter is inserted into the closed end of the cathode tube, the outer shell is sleeved on the outside of the cathode tube, and the outer shell, the emitter, and the cathode tube are coaxially arranged. The base plate is sleeved on the outer wall of the open end of the cathode tube, and an insulating ceramic base is provided between the base plate and the outer shell. The insulating ceramic base is sleeved on the outer wall of the cathode tube. The base plate is connected to the outer wall of the cathode tube through the insulating ceramic. The base is connected to one end of the housing, the magnetic shield is embedded in the inner wall of the other end of the housing, and the magnetic shield is sleeved on the outside of the closed end of the cathode tube. The insulating channel is embedded in the magnetic shield, and the insulating channel, cathode tube and magnetic shield are coaxially arranged. The anode is embedded in the insulating channel, the No. 1 permanent magnet is sleeved on the outside of the insulating channel, and the No. 2 permanent magnet is embedded between the insulating channel and the magnetic shield, and the No. 1 permanent magnet and the No. 2 permanent magnet are connected through the magnetic shield. When the cathode in the thruster is ignited, a voltage is applied to the magnetic shield, so that the magnetic shield acts as a contact pole.

[0007] Furthermore, the insulating channel includes an inner tube No. 1, an outer tube No. 1 and a connecting ring piece No. 1, the outer tube No. 1 is sleeved on the outside of the inner tube No. 1, and the outer tube No. 1 and the inner tube No. 1 are coaxially arranged, a gap is provided between the outer tube No. 1 and the inner tube No. 1, one end of the inner tube No. 1 is a closed end, and the other end of the inner tube No. 1 is an open end, the connecting ring piece No. 1 is arranged corresponding to one end of the outer tube No. 1 and the open end of the inner tube No. 1, and the connecting ring piece No. 1 is fixedly connected to both the outer tube No. 1 and the inner tube No. 1, the outer ring wall of the connecting ring piece No. 1 is coplanar with the outer wall of the outer tube No. 1, and the inner ring wall of the connecting ring piece No. 1 is coplanar with the inner ring wall of the inner tube No. 1;

[0008] Furthermore, the magnetic shield includes a No. 2 inner cylinder, a No. 2 outer cylinder and a No. 2 connecting ring piece, the No. 2 outer cylinder is sleeved on the outside of the No. 2 inner cylinder, and the No. 2 outer cylinder and the No. 2 inner cylinder are coaxially arranged, a gap is provided between the No. 2 outer cylinder and the No. 2 inner cylinder, two ends of the No. 2 inner cylinder are closed ends, and the other two ends of the No. 2 inner cylinder are open ends, the No. 2 connecting ring piece is arranged corresponding to one end of the No. 2 outer cylinder and the open end of the No. 2 inner cylinder, and the No. 2 connecting ring piece is fixedly connected to the No. 2 outer cylinder and the No. 2 inner cylinder, the outer ring wall of the No. 2 connecting ring piece is coplanar with the outer wall of the No. 2 outer cylinder, and the inner ring wall of the No. 2 connecting ring piece is coplanar with the inner ring wall of the No. 2 inner cylinder;

[0009] The open end of the No. 1 inner tube is sleeved on the closed end of the No. 2 inner tube, the No. 1 outer tube is inserted into the No. 2 outer tube, the No. 1 connecting ring piece and the No. 2 connecting ring piece are stacked, and the No. 2 inner tube is sleeved on the outside of the closed end of the cathode tube;

[0010] Furthermore, the anode is an annular sheet structure, the anode is sleeved between the first inner cylinder and the first outer cylinder, and the anode and the first connecting ring sheet are stacked;

[0011] Furthermore, a first annular embedded groove is machined on the outer annular wall of the closed end of the second inner cylinder along the axis extending direction of the second inner cylinder. The second permanent magnet is an annular permanent magnet and is disposed in the first annular embedded groove, with one end of the second permanent magnet in close contact with the bottom of the first annular embedded groove, the inner annular surface of the second permanent magnet in close contact with the wall of the first annular embedded groove, and the outer annular surface of the second permanent magnet in close contact with the inner annular wall of the first inner cylinder.

[0012] Furthermore, a second annular embedding groove is machined on the inner wall of the other end of the shell along the axis extending direction of the shell, the second outer cylinder is embedded in the second annular embedding groove, and the outer annular wall of the second outer cylinder is in close contact with the groove wall of the second annular embedding groove, and the other end face of the second outer cylinder is arranged coplanar with the other end face of the shell, and the first permanent magnet is an annular permanent magnet, and the first permanent magnet is mounted on the outer annular wall of the first outer cylinder, and the end wall of the first permanent magnet is in close contact with the other end face of the first outer cylinder and the other end face of the shell;

[0013] Furthermore, a first through hole is machined at the center of the closed end of the cathode tube, a second through hole is machined at the center of the closed end of the second inner tube, and a third through hole is machined at the center of the closed end of the first inner tube, and the first through hole, the second through hole and the third through hole are coaxially arranged;

[0014] Furthermore, the insulating ceramic base is made of alumina composite ceramic;

[0015] Furthermore, the closed end surface of the cathode tube is made of tungsten, and the tube body is made of stainless steel;

[0016] Furthermore, the voltage applied to the magnetic shield during thruster ignition is 500V;

[0017] The beneficial effects of this application compared to the prior art are as follows:

[0018] This application proposes a simplified, thermal-free hollow cathode thruster. Compared to conventional hollow cathode thrusters, this design integrates the functions of a magnetic shield and a contact pole. By applying a voltage to the magnetic shield during cathode ignition, the magnetic shield acts as a contact pole. For a cathode thruster, channel size is related to discharge power, and the flow area within the channel determines the gas density within the channel. Therefore, for a given thruster power, the channel size is essentially fixed and cannot be too small. The conventional hollow cathode thruster has a diameter of 52 mm. For practical applications, the installation dimension must be less than 50 mm, so the dimension must be minimized. By integrating the magnetic shield and contact pole, the thruster dimension is reduced to 49 mm, meeting practical installation requirements. Furthermore, in conventional hollow cathode thrusters, discharge between the contact pole and the magnetic shield can cause unstable discharge within the thruster. Combining the two structures eliminates this issue, increasing the practicality of the hollow cathode thruster. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the simplified structure of the thermonuclear hollow cathode thruster described in this application;

[0020] Figure 2 A schematic diagram of the magnetic field generated by the simplified structure of the thermonuclear hollow cathode thruster described in this application;

[0021] In the figure, 1 is the base plate, 2 is the insulating ceramic base, 3 is the shell, 4 is the anode, 5 is the insulating channel, 6 is the first permanent magnet, 7 is the second permanent magnet, 8 is the emitter, 9 is the cathode tube and 10 is the magnetic screen. DETAILED DESCRIPTION

[0022] Specific implementation method 1: Combination Figures 1 to 2 This embodiment describes a simplified structure of a heatless hollow cathode thruster, comprising a base plate 1, an insulating ceramic base 2, a housing 3, an anode 4, an insulating channel 5, a first permanent magnet 6, a second permanent magnet 7, an emitter 8, a cathode tube 9, and a magnetic shield 10. The emitter 8 is inserted into the closed end of the cathode tube 9, the housing 3 is sleeved on the outside of the cathode tube 9, and the housing 3, the emitter 8, and the cathode tube 9 are coaxially arranged. The base plate 1 is sleeved on the outer wall of the open end of the cathode tube 9, and an insulating ceramic base 2 is provided between the base plate 1 and the housing 3. The insulating ceramic base 2 is sleeved on the outer wall of the cathode tube 9. The base plate 1 It is connected to one end of the shell 3 through an insulating ceramic base 2, and a magnetic shield 10 is embedded in the inner wall of the other end of the shell 3. The magnetic shield 10 is sleeved on the outside of the closed end of the cathode tube 9. The insulating channel 5 is embedded in the magnetic shield 10, and the insulating channel 5, cathode tube 9 and magnetic shield 10 are coaxially arranged. The anode 4 is embedded in the insulating channel 5, the No. 1 permanent magnet 6 is sleeved on the outside of the insulating channel 5, the No. 2 permanent magnet 7 is embedded between the insulating channel 5 and the magnetic shield 10, and the No. 1 permanent magnet 6 and the No. 2 permanent magnet 7 are connected through the magnetic shield 10. When the cathode in the thruster is ignited, a voltage is applied to the magnetic shield 10, so that the magnetic shield 10 acts as a touch pole.

[0023] A more simplified structure of a thermistor-free hollow cathode thruster is provided in this embodiment. The invention lies in giving the magnetic shield 10 two functions. The first function is to act as a magnetic shield to construct the magnetic field in the channel. The second function is to act as a touch pole for igniting the thruster cathode. The advantage of this design is that the overall structure of the hollow cathode thruster can be simplified, and the size of the thruster can be further reduced, so that it has a size advantage over other hollow cathode thrusters. The thruster structure provided in this application is a 100-watt electric propulsion product, which is mainly used on cube satellites for orbit maintenance and ascension of cube satellites.

[0024] In a traditional hollow cathode thruster, the cathode is structurally divided into several components: a contact pole, cathode tube, and emitter. At the thruster end, a magnet or coil structure is required to generate a magnetic field, and a magnetic shield is used to create a zero-magnetic field region within the channel. The cathode is placed in the center of the thruster. The contact pole applies a high potential during ignition and requires insulation from surrounding metal components, such as the magnetic shield. This is achieved by eliminating contact or by adding insulating components, resulting in a complex structure and a relatively large radial dimension. Therefore, this embodiment proposes a simplified hollow cathode thruster that combines the functions of the magnetic shield and the contact pole into a single component. Furthermore, due to the insulation at the bottom, the thruster's radial dimensions can be further reduced, allowing for a smaller thruster design with fewer parts and a lighter weight.

[0025] Specific implementation method 2: Combination Figures 1 to 2 This embodiment is described. This embodiment differs from the first embodiment in that the insulating channel 5 includes a No. 1 inner tube, a No. 1 outer tube, and a No. 1 connecting ring. The No. 1 outer tube is sleeved on the outside of the No. 1 inner tube and is coaxially arranged with the No. 1 inner tube. A gap is provided between the No. 1 outer tube and the No. 1 inner tube. One end of the No. 1 inner tube is closed, and the other end of the No. 1 inner tube is open. The No. 1 connecting ring is arranged corresponding to one end of the No. 1 outer tube and the open end of the No. 1 inner tube, and is fixedly connected to both the No. 1 outer tube and the No. 1 inner tube. The outer ring wall of the No. 1 connecting ring is coplanar with the outer wall of the No. 1 outer tube, and the inner ring wall of the No. 1 connecting ring is coplanar with the inner ring wall of the No. 1 inner tube. Other components and connection methods are the same as those in the first embodiment.

[0026] Specific implementation method three: Combination Figures 1 to 2 To explain this embodiment, the difference between this embodiment and the specific embodiment 2 is that the magnetic shield 10 includes a No. 2 inner cylinder, a No. 2 outer cylinder and a No. 2 connecting ring piece. The No. 2 outer cylinder is sleeved on the outside of the No. 2 inner cylinder, and the No. 2 outer cylinder and the No. 2 inner cylinder are coaxially arranged. There is a gap between the No. 2 outer cylinder and the No. 2 inner cylinder. The two ends of the No. 2 inner cylinder are closed ends, and the other two ends of the No. 2 inner cylinder are open ends. The No. 2 connecting ring piece is arranged corresponding to one end of the No. 2 outer cylinder and the open end of the No. 2 inner cylinder, and the No. 2 connecting ring piece is fixedly connected to the No. 2 outer cylinder and the No. 2 inner cylinder. The outer ring wall of the No. 2 connecting ring piece is coplanar with the outer wall of the No. 2 outer cylinder, and the inner ring wall of the No. 2 connecting ring piece is coplanar with the inner ring wall of the No. 2 inner cylinder. The open end of the No. 1 inner cylinder is sleeved on the closed end of the No. 2 inner cylinder, the No. 1 outer cylinder is inserted into the No. 2 outer cylinder, the No. 1 connecting ring piece and the No. 2 connecting ring piece are stacked, and the No. 2 inner cylinder is sleeved on the outside of the closed end of the cathode tube 9. Other components and connection methods are the same as those in the second embodiment.

[0027] In combination with the description of the second and third embodiments, the material of the magnetic shield 10 is pure iron. The material of the insulating channel 5 is ceramic, specifically boron nitride ceramic.

[0028] Specific implementation method four: Combination Figures 1 to 2 This embodiment differs from the third embodiment in that anode 4 is an annular sheet structure, nested between a first inner cylinder and a first outer cylinder, and stacked with a first connecting ring sheet. The remaining components and connection methods are the same as those of the third embodiment.

[0029] Specific implementation method five: Combination Figures 1 to 2 This embodiment differs from the fourth embodiment in that a first annular groove is machined into the outer annular wall of the closed end of the second inner cylinder, extending along the axis of the second inner cylinder. The second permanent magnet 7 is an annular permanent magnet and is disposed within the first annular groove. One end of the second permanent magnet 7 is in close contact with the bottom of the first annular groove, the inner annular surface of the second permanent magnet 7 is in close contact with the wall of the first annular groove, and the outer annular surface of the second permanent magnet 7 is in close contact with the inner annular wall of the first inner cylinder. The remaining components and connection methods are the same as those of the fourth embodiment.

[0030] Specific implementation method six: combination Figures 1 to 2 This embodiment differs from the fifth embodiment in that a second annular groove is machined on the inner wall of the other end of the housing 3 along the axis of the housing. The second outer cylinder is mounted in this groove, with the outer wall of the second outer cylinder in close contact with the groove wall of the second annular groove. The other end face of the second outer cylinder is coplanar with the other end face of the housing 3. The first permanent magnet 6 is an annular permanent magnet and is mounted on the outer wall of the first outer cylinder. The end wall of the first permanent magnet 6, the other end face of the first outer cylinder, and the other end face of the housing 3 are in close contact. The other components and connection methods are the same as those of the fifth embodiment.

[0031] With reference to the fifth and sixth embodiments, the first permanent magnet 6, the second permanent magnet 7 and the magnetic shield 10 are used to construct the magnetic field inside the passage. The first permanent magnet 6 and the second permanent magnet 7 are both high-temperature resistant samarium cobalt permanent magnets that can withstand temperatures of 350°C without demagnetization, and thus will not be demagnetized due to the high temperature inside the insulating channel 5. The function of the magnetic field is to confine electrons, increase the electron temperature, fully ionize the working gas atoms, and improve the efficiency of the thruster. The second permanent magnet 7 is fixed by the magnetic shield 10, and does not require an additional support structure, which is conducive to simplifying the internal structure of the thruster and reducing the structural size of the thruster.

[0032] Specific implementation method seven: combination Figures 1 to 2This embodiment differs from the sixth embodiment in that a first through-hole is machined at the center of the closed end of the cathode tube 9, a second through-hole is machined at the center of the closed end of the second inner tube, and a third through-hole is machined at the center of the closed end of the first inner tube. These three through-holes are coaxially arranged. The remaining components and connection methods are the same as those of the fifth embodiment.

[0033] Specific implementation method eight: combination Figures 1 to 2 This embodiment differs from the seventh embodiment in that the insulating ceramic base 2 is made of alumina composite ceramic. The other components and connection methods are the same as those of the fifth embodiment.

[0034] In this embodiment, when the thruster is operating, the housing 3 and the magnetic shield 10 are in an electrically conductive state, and a high potential also exists on the housing 3 when the cathode is ignited. Since the magnetic shield 10 acts as a holding pole, the magnetic shield 10 and the housing 3 are at the same potential. When the thruster is operating, the holding pole, that is, the magnetic shield 10, will have a voltage of about 10-20V, and the housing 3 will also have a voltage of about 10-20V. Therefore, it is necessary to use an insulating ceramic base 2 to insulate the housing 3 from the base 1.

[0035] Specific implementation method nine: combination Figures 1 to 2 This embodiment differs from the eighth embodiment in that the closed end surface of the cathode tube 9 is made of tungsten and the tube body is made of stainless steel. The other components and connection methods are the same as those of the fifth embodiment.

[0036] Specific implementation method ten: Combination Figures 1 to 2 This embodiment is described. This embodiment differs from the ninth embodiment in that the voltage applied to the magnetic shield 10 during thruster ignition is 500 V. The other components and connection methods are the same as those of the fifth embodiment.

[0037] The present invention has been disclosed as above with reference to preferred embodiments, but this is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0038] How it works

[0039] The simplified, heatless hollow cathode thruster provided herein first ignites the cathode during operation. A high voltage of 500V is applied to the magnetic shield 10, and cathode flux is injected through the cathode tube 9. Breakdown occurs between the magnetic shield 10 and the cathode tube 9, generating a large amount of plasma. This plasma heats the emitter 8, bringing it to operating temperature and enabling stable cathode discharge. A magnetic field is generated within the channel by permanent magnets 6 and 7, which confine electrons. Gas is injected into the channel through the anode 4, to which a voltage of 300V is applied. Electrons collide with gas atoms to generate ions, which are accelerated and ejected by the electric field. Under the action of the electric field, the electrons move toward the anode 4, forming an external discharge loop, completing the main thruster ignition process.

Claims

1. A simplified structured thermonuclear hollow cathode thruster comprising a base plate (1), an insulating ceramic base (2), a housing (3), an anode (4), an insulating channel (5), a first permanent magnet (6), a second permanent magnet (7), an emitter (8), a cathode tube (9), and a magnetic shield (10), characterized in that: The emitter (8) is inserted into the closed end of the cathode tube (9), the shell (3) is sleeved on the outside of the cathode tube (9), and the shell (3), the emitter (8) and the cathode tube (9) are coaxially arranged. The bottom plate (1) is sleeved on the outer wall of the open end of the cathode tube (9), and an insulating ceramic base (2) is provided between the bottom plate (1) and the shell (3). The insulating ceramic base (2) is sleeved on the outer wall of the cathode tube (9). The bottom plate (1) is connected to one end of the shell (3) through the insulating ceramic base (2). The magnetic shield (10) is embedded on the inner wall of the other end of the shell (3), and the magnetic shield (10) is sleeved. On the outside of the closed end of the cathode tube (9), an insulating channel (5) is embedded in a magnetic shield (10), and the insulating channel (5), the cathode tube (9) and the magnetic shield (10) are coaxially arranged. The anode (4) is embedded in the insulating channel (5), the first permanent magnet (6) is sleeved on the outside of the insulating channel (5), the second permanent magnet (7) is embedded between the insulating channel (5) and the magnetic shield (10), and the first permanent magnet (6) and the second permanent magnet (7) are connected through the magnetic shield (10). When the cathode in the thruster is ignited, a voltage is applied to the magnetic shield (10), so that the magnetic shield (10) acts as a contact pole.

2. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 1, characterized in that: The insulating channel (5) comprises an inner tube No. 1, an outer tube No. 1 and a connecting ring piece No. 1, wherein the outer tube No. 1 is sleeved on the outer side of the inner tube No. 1, and the outer tube No. 1 and the inner tube No. 1 are coaxially arranged, and a gap is provided between the outer tube No. 1 and the inner tube No. 1, wherein one end of the inner tube No. 1 is a closed end, and the other end of the inner tube No. 1 is an open end, and the connecting ring piece No. 1 is arranged corresponding to one end of the outer tube No. 1 and the open end of the inner tube No. 1, and the connecting ring piece No. 1 is fixedly connected to the outer tube No. 1 and the inner tube No. 1, and the outer ring wall of the connecting ring piece No. 1 is coplanar with the outer wall of the outer tube No. 1, and the inner ring wall of the connecting ring piece No. 1 is coplanar with the inner ring wall of the inner tube No.

1.

3. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 1, characterized in that: The magnetic shield (10) comprises a No. 2 inner cylinder, a No. 2 outer cylinder and a No. 2 connecting ring piece. The No. 2 outer cylinder is sleeved on the outer side of the No. 2 inner cylinder, and the No. 2 outer cylinder and the No. 2 inner cylinder are coaxially arranged. A gap is provided between the No. 2 outer cylinder and the No. 2 inner cylinder. Two ends of the No. 2 inner cylinder are closed ends, and the other two ends of the No. 2 inner cylinder are open ends. The No. 2 connecting ring piece is arranged corresponding to one end of the No. 2 outer cylinder and the open end of the No. 2 inner cylinder, and the No. 2 connecting ring piece is fixedly connected to the No. 2 outer cylinder and the No. 2 inner cylinder. The outer ring wall of the No. 2 connecting ring piece is coplanar with the outer wall of the No. 2 outer cylinder, and the inner ring wall of the No. 2 connecting ring piece is coplanar with the inner ring wall of the No. 2 inner cylinder. The open end of the No. 1 inner tube is sleeved on the closed end of the No. 2 inner tube, the No. 1 outer tube is inserted into the No. 2 outer tube, the No. 1 connecting ring piece and the No. 2 connecting ring piece are stacked, and the No. 2 inner tube is sleeved on the outside of the closed end of the cathode tube (9).

4. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 3, characterized in that: The anode (4) is an annular sheet structure, and the anode (4) is sleeved between the first inner cylinder and the first outer cylinder, and the anode (4) and the first connecting ring sheet are stacked.

5. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 1, characterized in that: A first annular embedded groove is processed on the outer annular wall of the closed end of the second inner cylinder along the axis extension direction of the second inner cylinder. The second permanent magnet (7) is an annular permanent magnet. The second permanent magnet (7) is arranged in the first annular embedded groove, and one end of the second permanent magnet (7) is in close contact with the groove bottom of the first annular embedded groove, the inner annular surface of the second permanent magnet (7) is in close contact with the groove wall of the first annular embedded groove, and the outer annular surface of the second permanent magnet (7) is in close contact with the inner annular wall of the first inner cylinder.

6. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 5, characterized in that: A second annular embedding groove is machined on the inner wall of the other end of the shell (3) along the axis extension direction of the shell, the second outer cylinder is embedded in the second annular embedding groove, and the outer annular wall of the second outer cylinder is in close contact with the groove wall of the second annular embedding groove, the other end face of the second outer cylinder is coplanar with the other end face of the shell (3), the first permanent magnet (6) is an annular permanent magnet, the first permanent magnet (6) is mounted on the outer annular wall of the first outer cylinder, and the end wall of the first permanent magnet (6) is in close contact with the other end face of the first outer cylinder and the other end face of the shell (3).

7. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 6, characterized in that: A through hole No. 1 is processed at the center of the closed end of the cathode tube (9), a through hole No. 2 is processed at the center of the closed end of the second inner tube, and a through hole No. 3 is processed at the center of the closed end of the first inner tube, and the through hole No. 1, the through hole No. 2 and the through hole No. 3 are coaxially arranged.

8. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 1, characterized in that: The insulating ceramic base (2) is made of alumina composite ceramic.

9. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 8, characterized in that: The closed end surface of the cathode tube (9) is made of tungsten, and the tube body is made of stainless steel.

10. The simplified structure of the pyrogen-free hollow cathode thruster according to claim 1, characterized in that: The voltage applied to the magnetic shield (10) when the thruster is ignited is 500V.

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