Ppt body anti-carbon deposition structure and method

Abstract

The application discloses a PPT body anti-carbon deposition structure and method, which comprises a shell and at least one thrust chamber arranged on the shell; the thrust chamber comprises a thrust chamber frame shell, a cathode plate, an anode plate, a spark plug, a solid working medium and an anti-carbon deposition assembly, and one end of the thrust chamber is a thrust outlet; the cathode plate and the anode plate are arranged on upper and lower inner walls of the thrust chamber frame shell, and one end of the solid working medium is in the thrust chamber and in contact with the cathode plate and the anode plate; the anti-carbon deposition assembly comprises two anti-carbon insulation sheets, the two anti-carbon insulation sheets are located on left and right inner walls of the thrust chamber frame shell close to the outlet, and a notch extending to the inside of the thrust chamber is arranged in a middle region of the anti-carbon insulation sheet corresponding to one end of the thrust outlet. The application is applied to the field of spacecraft propulsion and can avoid forming a discharge loop between the cathode plate and the anode plate in the process of long-time operation of the pulsed plasma thruster, thereby ensuring long-time stable and reliable operation of the thruster.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spacecraft propulsion technology, in particular to a PPT body anti-carbon deposition structure and method. BACKGROUND

[0002] Pulsed plasma thruster (PPT) is an electric propulsion device widely used in microsatellites and probes. PPT generates pulsed thrust through electromagnetic means, mainly for attitude control, orbit adjustment and precise fine tuning.

[0003] PPT usually uses solid propellant, the most common being Polytetrafluoroethylene (PTFE), which is usually in the form of a rod or a plate placed in the discharge chamber of the thruster. In operation, a high-voltage power supply and energy storage capacitor apply high voltage between the cathode and anode, and a spark plug or other triggering device is used to initiate discharge on the surface of the propellant, generating high-temperature and high-pressure plasma. The generated plasma is accelerated and ejected at high speed from the nozzle under the action of the electromagnetic field, forming a plasma jet. According to the principle of reaction force, the ejected plasma generates a reverse thrust, thereby propelling the spacecraft to adjust its attitude or correct its orbit.

[0004] During the ionization process of the solid propellant of the long-running pulsed plasma thruster, carbon ions generated may gradually accumulate on the wall surface of the thrust chamber. The adsorption of such carbon ions may make the wall surface conductive, causing an accidental discharge loop between the cathode plate and the anode plate, ultimately leading to serious limitations on the performance of the thruster, or even making it unable to work normally. Based on this, an innovative PPT body structure needs to be developed to effectively prevent the formation of a loop between the cathode plate and the anode plate, ensuring the long-term stable and reliable operation of the thruster. SUMMARY

[0005] To overcome the shortcomings of the prior art, the present application provides a PPT body anti-carbon deposition structure and method, which can prevent the formation of a loop between the cathode plate and the anode plate during the long-term operation of the pulsed plasma thruster, ensuring the long-term stable and reliable operation of the thruster.

[0006] To achieve the above-mentioned purpose, the present application provides a PPT body anti-carbon deposition structure, comprising a shell and at least one thrust chamber provided on the shell;

[0007] The thrust chamber comprises a thrust chamber frame shell, a cathode plate, an anode plate, a spark plug, a solid working medium and an anti-carbon deposition assembly, one end of the thrust chamber being a thrust outlet;

[0008] The cathode plate and the anode plate are arranged on the upper and lower inner walls of the thrust chamber frame shell, the spark plug is located on the cathode plate, and one end of the solid working medium is located in the thrust chamber and in contact with the cathode plate and the anode plate.

[0009] The anti-carbon deposition assembly comprises two anti-carbon insulation sheets, the two anti-carbon insulation sheets are arranged on the left and right inner walls of the thrust chamber, and one end of the anti-carbon insulation sheet corresponding to the thrust outlet is provided with a notch extending to the inside of the thrust chamber.

[0010] In one of the embodiments, the first side of the anti-carbon insulation sheet is fixedly connected to the inner wall of the thrust chamber, and the second side of the anti-carbon insulation sheet has a gap with the solid working medium.

[0011] In one of the embodiments, the gap has a width of 0.05mm-5mm.

[0012] In one of the embodiments, the inner wall of the thrust chamber frame shell is provided with a notch or an inner recessed groove at a position corresponding to the notch.

[0013] In one of the embodiments, when the number of the thrust chambers is more than two, the thrust chambers are arranged in a linear array on the shell, and two adjacent thrust chambers are separated by a partition plate.

[0014] The anti-carbon insulation sheet corresponding to each thrust chamber is arranged on the inner wall of the shell or the partition plate.

[0015] When the anti-carbon insulation sheet is arranged on the inner wall of the shell, the inner wall of the shell is provided with an inner recessed groove at a position corresponding to the notch.

[0016] When the anti-carbon insulation sheet is arranged on the partition plate, the partition plate is provided with a notch at a position corresponding to the notch.

[0017] In one of the embodiments, the width of the notch or the groove is greater than the width of the notch.

[0018] In one of the embodiments, the depth of the notch on the anti-carbon insulation sheet exceeds the end surface of the solid working medium, and then extends more than 2mm in the direction opposite to the thrust outlet.

[0019] In one of the embodiments, the anti-carbon insulation sheet is made of an ablation-resistant and high-temperature-resistant material, and the anti-carbon insulation sheet is disconnected at a position corresponding to the notch, that is, the anti-carbon insulation sheet is divided into two or more parts by the notch.

[0020] In one of the embodiments, the shape of the notch is linear, curved or zigzag, and the number of the notch on the anti-carbon insulation sheet is one or more than two.

[0021] In one of the embodiments, the solid working substance has a plurality of open grooves on its upper and lower sides, and each of the open grooves is spaced along the length direction of the solid working substance

[0022] To achieve the above object, the application further provides a PPT body anti-carbon deposition method, which assembles the above-mentioned PPT body anti-carbon deposition structure on a pulse plasma thruster to realize the anti-carbon deposition treatment of the PPT body.

[0023] Compared with the prior art, the application has the following beneficial technical effects:

[0024] 1. The application arranges the carbon-proof insulation sheets on the left and right inner walls of the thrust outlet, and opens notches in the carbon-proof insulation sheets, so that even if carbon ions are adsorbed on the surface of the carbon-proof insulation sheets due to long-time operation of the pulse plasma thruster, the existence of the notches can effectively avoid the communication of the two sides of the carbon-proof insulation sheets, achieve the effect of preventing carbon deposition, and further avoid the formation of a loop between the cathode plate and the anode plate in the process of long-time operation of the pulse plasma thruster, thereby ensuring the long-time stable and reliable operation of the thruster.

[0025] 2. The application only needs to add the carbon-proof insulation sheets on the basis of the existing pulse plasma thruster to effectively achieve the anti-carbon deposition, which is not only simple in structure and convenient to operate, but also can effectively reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0027] Figure 1 is the axonometric view of the PPT body anti-carbon deposition structure in the embodiment of the application;

[0028] Figure 2 is the side view of the PPT body anti-carbon deposition structure in the embodiment of the application;

[0029] Figure 3 is the sectional view of the PPT body anti-carbon deposition structure in the embodiment of the application;

[0030] Figure 4 is the axonometric view of the shell in the embodiment of the application;

[0031] Figure 5 is the partial axonometric view of the thrust chamber in the embodiment of the application.

[0032] Number: shell 1, thrust chamber 101, partition 102, sink 103, notch 104, anode plate 2, convex structure 201, cathode plate 3, solid working medium 4, open slot 401, carbon-proof insulation sheet 5, slot 501.

[0033] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments in combination with the drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0036] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0037] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or physical connection or wireless communication connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0039] AsFigures 1 to 5 The PPT body anti-carbon deposition structure disclosed in the embodiment mainly comprises a shell 1 and a thrust chamber 101 arranged on the shell 1. The thrust chamber 101 comprises a thrust chamber frame shell, an anode plate 2, a cathode plate 3, a spark plug, a solid working medium 4 and an anti-carbon deposition assembly. The thrust chamber frame shell is part of the shell 1.

[0040] The thrust chamber 101 is a rectangular channel arranged at one end of the shell 1, and the opening at one end of the thrust chamber 101 is a thrust outlet. The anode plate 2 and the cathode plate 3 are arranged on the upper and lower inner walls of the thrust chamber frame shell. In the embodiment, the anode plate 2 and the cathode plate 3 are fixed on the upper and lower inner walls of the thrust chamber 101 by bolts and are located close to the thrust outlet. Meanwhile, the spark plug is assembled on the cathode plate 3. The solid working medium 4 is arranged in the thrust chamber 101 and is in contact with the anode plate 2 and the cathode plate 3. Specifically, a protruding structure 201 is arranged on the anode plate 2, and the end of the lower side of the solid working medium 4 abuts against the protruding structure 201. The upper side of the solid working medium 4 is in contact with the cathode plate 3. Meanwhile, a spring power element is arranged between the solid working medium 4 and the cathode plate 3, so that the solid working medium 4 always has a tendency to move towards the thrust outlet, thereby ensuring that the solid working medium 4 always maintains contact with the anode plate 2 and the cathode plate 3, so as to ensure stable supply of the solid working medium 4 and continuous operation of the thrust chamber. Arranging a spring between the solid working medium 4 and the anode plate 2 or the cathode plate 3 is a conventional means in the field, and the embodiment will not be described in detail.

[0041] In the embodiment, the anti-carbon deposition assembly comprises two anti-carbon insulation sheets 5 made of insulating material. The two anti-carbon insulation sheets 5 are arranged on the left and right inner walls of the thrust chamber, and a slot 501 extending towards the inside of the thrust chamber 101 is arranged in the middle region of the anti-carbon insulation sheet 5 corresponding to the end of the thrust outlet. Specifically, the anti-carbon insulation sheet 5 is fixed on the left and right inner walls of the thrust chamber 101 close to the outlet of the thrust chamber 101 by bolt connection and / or adhesive bonding and the like. The first end of the anti-carbon insulation sheet 5 extends into the shell by more than 2 mm from the end surface of the solid working medium 4, the second end of the anti-carbon insulation sheet 5 is flush with or close to the thrust outlet, and the slot 501 is arranged in the middle region of the second end of the anti-carbon insulation sheet 5 and extends towards the first end. When the pulsed plasma thruster works for a long time, most of the carbon ions are adsorbed on the surface of the anti-carbon insulation sheet 5 due to the presence of the anti-carbon insulation sheet 5. The presence of the slot 501 can effectively avoid the communication between the two sides of the anti-carbon insulation sheet 5, thereby avoiding the formation of a loop between the cathode plate 3 and the anode plate 2 during the long-time operation of the pulsed plasma thruster, and ensuring the long-time stable and reliable operation of the thruster.

[0042] In the specific implementation process, the first side of the carbon-proof insulation sheet 5 is fixedly connected with the inner wall of the thrust chamber 101 by bolt connection and / or gluing and the like, and the second side of the carbon-proof insulation sheet 5 has a gap with the solid working medium 4, wherein the width of the gap is preferably 0.05mm-5mm to prevent carbon ion backflow from polluting the working medium side.

[0043] In the specific implementation process, the depth of the notch 501 on the carbon-proof insulation sheet 5 exceeds the end face of the solid working medium 4, and then extends more than 2mm in the opposite direction of the thrust outlet, and the longer the extension length is, the better. It is worth noting that in the specific application, the width and depth of the notch 501 on the carbon-proof insulation sheet 5 are determined according to the design size constraints of the pulsed plasma thruster, and as long as the width and depth of the notch 501 are as large as possible under the premise of meeting the design size constraints of the pulsed plasma thruster, the width and depth of the notch 501 can be determined.

[0044] As a preferred implementation, the inner wall of the thrust chamber 101 is provided with a notch or an inner recessed groove at the position corresponding to the notch 501, that is, there is no contact between the position of the notch 501 on the carbon-proof insulation sheet 5 and the inner wall of the thrust chamber 101, so as to avoid that the carbon ions are adsorbed on the inner wall of the thrust chamber 101, which indirectly causes the two sides of the carbon-proof insulation sheet 5 to be communicated. Preferably, the width of the notch or the groove is greater than the width of the notch 501, and in the case of stable installation of the carbon-proof insulation sheet 5, the wider the width of the notch or the groove is, the better, and in the case of allowable conditions of the thrust chamber frame shell structure, the greater the depth of the notch or the groove is, the better.

[0045] In the embodiment, when the number of the thrust chambers on the shell 1 is two or more, the thrust chambers 101 of each thrust chamber are arranged in a linear array on the shell 1, and the two adjacent thrust chambers 101 are separated by the partition plate 102. The carbon-proof insulation sheet 5 corresponding to each thrust chamber is arranged on the inner wall of the shell 1 or the partition plate 102: when the carbon-proof insulation sheet 5 is arranged on the inner wall of the shell 1, the inner wall of the shell 1 is provided with an inner recessed groove 103 at the position corresponding to the notch 501; when the carbon-proof insulation sheet 5 is arranged on the partition plate 102, the partition plate 102 is provided with a notch 104 at the position corresponding to the notch 501, for example Figure 1 as shown.

[0046] In the specific implementation process, the carbon-proof insulation sheet 5 is made of ablation-resistant and high-temperature-resistant materials, such as insulation ceramic sheets, and the carbon-proof insulation sheet 5 can be disconnected at the position corresponding to the notch 501, that is, the carbon-proof insulation sheet 5 is divided into two or more parts by the notch. In addition, the shape of the notch 501 is linear, curved or polygonal, and the number of the notch 501 on the carbon-proof insulation sheet 5 is one or more than two, and when the number of the notch 501 is more than one, the corresponding groove or notch changes with the notch of the carbon-proof insulation sheet, and the notch 501 can also not be arranged at the middle position of the carbon-proof insulation sheet 5.

[0047] As a preferred implementation, the solid working substance 4 has a plurality of open grooves 401 on its upper and lower sides, and each open groove 401 is distributed along the length direction of the solid working substance 4, so that the carbon deposition on the solid working substance 4 can be self-fallen after extending to the opening, reducing the carbon deposition on the end area of the solid working substance 4 to block the working substance propulsion.

[0048] The embodiment also discloses a PPT body anti-carbon deposition method, that is, the PPT body anti-carbon deposition structure is assembled on the pulse plasma thruster, so that the loop between the cathode plate and the anode plate is avoided during the long-time operation of the pulse plasma thruster, and the long-time stable and reliable operation of the thruster is ensured.

[0049] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the present application, and the contents of the present application specification and drawings are included in the patent protection scope of the present application.

Claims

1. A PPT body anti-deposition structure, characterized in that, The shell and at least one thrust chamber arranged on the shell; The thrust chamber comprises a thrust chamber frame shell, a cathode plate, an anode plate, a spark plug, a solid working medium and a carbon deposition prevention assembly, and one end of the thrust chamber is a thrust outlet; The cathode plate and the anode plate are arranged on the upper and lower inner walls of the thrust chamber frame shell, the spark plug is located on the cathode plate, and one end of the solid working medium is in the thrust chamber and in contact with the cathode plate and the anode plate; The carbon deposition prevention assembly comprises two carbon deposition prevention insulation sheets, and the two carbon deposition prevention insulation sheets are located on the left and right inner walls of the thrust chamber, and one end of the carbon deposition prevention insulation sheet corresponding to the thrust outlet is provided with a notch extending towards the inside of the thrust chamber; The first side of the carbon deposition prevention insulation sheet is fixedly connected with the inner wall of the thrust chamber, and the second side of the carbon deposition prevention insulation sheet has a gap with the solid working medium; When the number of the thrust chambers is two or more, the thrust chambers are arranged in a linear array on the shell, and adjacent two thrust chambers are separated by a partition plate; the carbon deposition prevention insulation sheet corresponding to each thrust chamber is arranged on the inner wall of the shell or the partition plate; when the carbon deposition prevention insulation sheet is arranged on the inner wall of the shell, the inner wall of the shell is provided with a recessed groove at a position corresponding to the notch; when the carbon deposition prevention insulation sheet is arranged on the partition plate, the partition plate is provided with a notch at a position corresponding to the notch; The width of the notch or the groove is greater than the width of the notch.

2. The PPT body anti-deposition carbon structure according to claim 1, characterized in that, The width of the gap is 0.05mm-5mm.

3. The PPT body anti-deposition carbon structure according to claim 1 or 2, characterized in that, The depth of the notch on the carbon deposition prevention insulation sheet exceeds the end face of the solid working medium, and then extends in the direction opposite to the thrust outlet by more than 2mm.

4. The PPT body anti-deposition carbon structure according to claim 1 or 2, characterized in that, The carbon deposition prevention insulation sheet is made of an ablation-resistant and high-temperature-resistant material, and the carbon deposition prevention insulation sheet can be disconnected at a position corresponding to the notch, that is, the carbon deposition prevention insulation sheet is divided into two or more parts by the notch.

5. The PPT body anti-deposition carbon structure according to claim 1 or 2, characterized in that, The shape of the notch is linear, curved or polygonal, and the number of the notches on the carbon deposition prevention insulation sheet is one or more than two.

6. The PPT body anti-deposition carbon structure according to claim 1 or 2, characterized in that, The upper and lower sides of the solid working medium have a plurality of open grooves, and the open grooves are distributed along the length direction of the solid working medium.

7. A PPT body carbon deposition prevention method characterized by, The PPT body carbon deposition prevention structure of any one of claims 1-6 is assembled on a pulse plasma thruster to realize carbon deposition prevention treatment of the PPT body.

Images