阅读说明：本技术 多孔发射针浸润装置及方法 (Porous emission needle infiltration device and method ) 是由 郭登帅 张锐 严玲玲 余勇 黄志伟 李敏 谢祥华 康小明 吴勤勤 于 2020-05-22 设计创作，主要内容包括：本发明提供了一种多孔发射针浸润装置及方法,多孔发射针浸润装置包括上下垂直相对布置的浸润模块与加热装置,其中：浸润模块被配置为能够相对于加热装置上下移动,以处于第一浸润状态、第二浸润状态或第三浸润状态；浸润模块包括同轴且由上至下依次连接的存储室及多孔发射针,以及容置于存储室内的固态的推进剂；第一浸润状态包括：浸润模块完全悬置于加热装置上方,多孔发射针的孔隙贯通；第二浸润状态包括：浸润模块完全浸没于加热装置内,加热装置开启,推进剂熔化并通过重力作用以及毛细作用下流入多孔发射针的孔隙；第三浸润状态包括：加热装置关闭,多孔发射针孔隙内的推进剂重新恢复固态,以完成多孔发射针在装配前的浸润工作。(The invention provides a porous emission needle infiltration device and a method, wherein the porous emission needle infiltration device comprises an infiltration module and a heating device which are vertically and oppositely arranged, wherein: the wetting module is configured to be capable of moving up and down relative to the heating device so as to be in a first wetting state, a second wetting state or a third wetting state; the infiltration module comprises a storage chamber, a multi-hole emission needle and a solid propellant, wherein the storage chamber and the multi-hole emission needle are coaxial and are sequentially connected from top to bottom; the first wetting state includes: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated; the second wetting state includes: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle under the action of gravity and capillary; the third wetting state includes: and closing the heating device, and recovering the solid propellant in the pores of the porous emission needle to complete the infiltration work of the porous emission needle before assembly.)

1. The porous emission needle infiltration device is characterized by comprising an infiltration module and a heating device which are vertically and oppositely arranged, wherein:

the infiltration module is configured to be capable of moving up and down relative to the heating device to be in a first infiltration state, a second infiltration state or a third infiltration state;

the infiltration module comprises a storage chamber, a multi-hole emission needle and a solid propellant, wherein the storage chamber and the multi-hole emission needle are coaxial and are sequentially connected from top to bottom;

the first wetting state comprises: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated;

the second wetting state comprises: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle through the action of gravity and the action of capillary;

the third wetting state comprises: and the heating device is closed, and the propellant in the pores of the porous emission needle restores the solid state again so as to finish the infiltration work of the porous emission needle before assembly.

2. The infiltration apparatus of claim 1, wherein the tail of the porous emitter needle is fixed in the storage chamber, and the tip of the porous emitter needle is located outside the storage chamber; the needle point of the porous emission needle is vertically downward and faces the heating device, and the distance from the needle point to the top surface of the heating device is 100-500 micrometers;

the heating device is a cylindrical structure with a concave hole in the center, a heating wire is arranged on the inner side wall of the concave hole, and the concave hole is configured to accommodate the infiltration module.

3. The multi-hole emitter needle infiltration device of claim 2, wherein the infiltration temperature of the multi-hole emitter needle is calibrated, the heating power of the heating device is calibrated according to the infiltration temperature, and the heating is continuously carried out at the infiltration temperature until the propellant is completely melted, so that the propellant in the storage chamber is transported to the needle point under the action of gravity and capillary action to complete infiltration.

4. The multi-aperture emitter pin infiltration apparatus of claim 1, further comprising a base, a three-jaw chuck, a connecting rod, and a support frame, wherein:

the base is configured to place and secure the heating device;

the three-jaw chuck is configured to secure the storage chamber;

the support frame is fixedly connected to the base and fixes the three-jaw chuck through the connecting rod;

the height of the supporting frame is adjustable;

the base is horizontally placed in a vacuum chamber, and a power supply outside the vacuum chamber supplies power to the heating device.

5. The porous emitter pin infiltration apparatus of claim 1, wherein the porous emitter pins include, but are not limited to, tungsten, rhenium;

the propellant includes, but is not limited to, indium, gallium, cesium.

6. A porous emission needle infiltration method is characterized by comprising the following steps:

vertically and oppositely arranging the infiltration module and the heating device;

the infiltration module moves up and down relative to the heating device so as to be in a first infiltration state, a second infiltration state or a third infiltration state;

coaxially and sequentially connecting a storage chamber of the infiltration module and the porous emission needle from top to bottom, and placing a solid propellant in the storage chamber;

the first wetting state comprises: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated;

the second wetting state comprises: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle through the action of gravity and the action of capillary;

the third wetting state comprises: and the heating device is closed, and the propellant in the pores of the porous emission needle restores the solid state again so as to finish the infiltration work of the porous emission needle before assembly.

7. The infiltration method of claim 6, wherein the height of the support is lowered such that the porous emitter pins and the storage chamber are located inside the heating device;

when the needle points of the calibration storage chamber and the porous emission needle reach 1000 ℃, the heating power of the heating device forms calibration power;

and continuously heating the porous emission needle and the storage chamber under the calibrated power for not less than 10 minutes to complete the infiltration of the porous emission needle.

Technical Field

The invention relates to the technical field of electric propulsion, in particular to a porous emission needle infiltration device and a porous emission needle infiltration method.

Background

The traditional needle type field emission electric thruster is an electric thruster based on a liquid metal ion source technology, an emission needle is usually solid tungsten, a metal propellant flows to a needle point along the emission needle under the capillary action of fine grooves on the surface of the emission needle after being heated and melted, and is ionized and accelerated to be sprayed out to generate thrust under the action of a strong electric field. The porous needle type field emission electric thruster is a novel field emission electric thruster, the emission needle of the thruster is in a porous structure, a large number of micron-scale holes are formed in the thruster, and metal propellant flows to a needle point under the capillary action of micropores in the emission needle after being heated and melted and is ionized by a strong electric field and sprayed out in an accelerating mode to generate thrust. Because the propellant flows inside, the porous needle type field emission electric thruster has the characteristics of strong pollution resistance and high stability.

The infiltration of the launching needle is one of the key technologies of the needle type field emission electric thruster and is carried out before the assembly of the thruster. Infiltration refers to adhering propellant to the surface of the emitter pin or filling pores inside, wherein infiltration of a solid emitter pin is to adhere propellant to the surface of the pin and infiltration of a porous emitter pin is to fill propellant into pores inside. The infiltration methods adopted in the prior art are all external infiltration methods, namely, metal propellant is heated and melted and is adhered to the surface of an emitting needle, and the methods are only suitable for infiltration of a solid emitting needle and cannot be used for a porous emitting needle. This is because in order to achieve continuous and stable operation of the thruster, the propellant must fill all pores inside the multi-hole launching pin, and the external wetting method can only adhere the propellant to the surface of the launching pin and cannot ensure good penetration into the micro-pores inside the multi-hole launching pin.

Chinese patent application No. CN201810321269.8, "the method for infiltrating an emitter and the special device thereof," mentions an infiltration method for a porous emitter, in which the emitter is immersed in a propellant, and the propellant enters a fine flow channel of the porous emitter by escaping the gas in the emitter and the propellant during the vacuum pumping process, but the method is only suitable for infiltrating liquid propellants such as ionic liquid, water, glycerin, etc., and is not suitable for solid metal propellants; furthermore, the projectile wetted by this method is still exposed to air during the assembly process, with the risk of contamination and discontinuity of wetting.

Disclosure of Invention

The invention aims to provide a porous emission needle infiltration device and a porous emission needle infiltration method, which are used for solving the problem that the existing external infiltration method is not suitable for infiltration of porous emission needles.

In order to solve the technical problem, the invention provides a porous emission needle infiltration device, which comprises an infiltration module and a heating device which are vertically and oppositely arranged, wherein:

the infiltration module is configured to be capable of moving up and down relative to the heating device to be in a first infiltration state, a second infiltration state or a third infiltration state;

the infiltration module comprises a storage chamber, a multi-hole emission needle and a solid propellant, wherein the storage chamber and the multi-hole emission needle are coaxial and are sequentially connected from top to bottom;

the first wetting state comprises: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated;

the second wetting state comprises: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle through the action of gravity and the action of capillary;

the third wetting state comprises: and the heating device is closed, and the propellant in the pores of the porous emission needle restores the solid state again so as to finish the infiltration work of the porous emission needle before assembly.

Optionally, in the porous emission needle infiltration device, the tail of the porous emission needle is fixed in the storage chamber, and the needle point of the porous emission needle is located outside the storage chamber; the needle point of the porous emission needle is vertically downward and faces the heating device, and the distance from the needle point to the top surface of the heating device is 100-500 micrometers;

the heating device is a cylindrical structure with a concave hole in the center, a heating wire is arranged on the inner side wall of the concave hole, and the concave hole is configured to accommodate the infiltration module.

Optionally, in the multi-hole emitting needle infiltration device, the infiltration temperature of the multi-hole emitting needle is calibrated, the heating power of the heating device is calibrated according to the infiltration temperature, and the heating device is continuously heated at the infiltration temperature until the propellant is completely melted, so that the propellant in the storage chamber is transported to the needle point under the action of gravity and capillary action to complete infiltration.

Optionally, in the porous emission needle infiltration device, the porous emission needle infiltration device further includes a base, a three-jaw chuck, a connecting rod, and a support frame, wherein:

the base is configured to place and secure the heating device;

the three-jaw chuck is configured to secure the storage chamber;

the support frame is fixedly connected to the base and fixes the three-jaw chuck through the connecting rod;

the height of the supporting frame is adjustable;

the base is horizontally placed in a vacuum chamber, and a power supply outside the vacuum chamber supplies power to the heating device.

Optionally, in the porous emission needle infiltration device, the porous emission needle includes, but is not limited to, tungsten, rhenium;

the propellant includes, but is not limited to, indium, gallium, cesium.

The invention also provides a porous emission needle infiltration method, which comprises the following steps:

vertically and oppositely arranging the infiltration module and the heating device;

the infiltration module moves up and down relative to the heating device so as to be in a first infiltration state, a second infiltration state or a third infiltration state;

coaxially and sequentially connecting a storage chamber of the infiltration module and the porous emission needle from top to bottom, and placing a solid propellant in the storage chamber;

the first wetting state comprises: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated;

the second wetting state comprises: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle through the action of gravity and the action of capillary;

the third wetting state comprises: and the heating device is closed, and the propellant in the pores of the porous emission needle restores the solid state again so as to finish the infiltration work of the porous emission needle before assembly.

Optionally, in the method for infiltrating the porous emission needle, the height of the support frame is reduced, so that the porous emission needle and the storage chamber are both located inside the heating device;

when the needle points of the calibration storage chamber and the porous emission needle reach 1000 ℃, the heating power of the heating device forms calibration power;

and continuously heating the porous emission needle and the storage chamber under the calibrated power for not less than 10 minutes to complete the infiltration of the porous emission needle.

In the porous emission needle infiltration device and the method provided by the invention, the infiltration module is completely suspended above the heating device, the pores of the porous emission needles are communicated, the infiltration module is completely immersed in the heating device, the heating device is started, the solid propellant is melted and flows into the pores of the porous emission needles under the action of gravity and capillary action, the heating device is closed, the propellant in the pores of the porous emission needles is restored to be solid again, so that the infiltration work of the porous emission needles before assembly is completed, the automatic flowing-down of the melted propellant under the action of gravity and capillary action is realized, the infiltration in the porous emission needles and the needle points is completed, the automatic infiltration of the emission needles of the field emission electric thruster can be realized, the method is simple, and only the heating power and the time of the heating device need to be controlled; in addition, the multi-hole emission needle is soaked in the propellant, the propellant flows in the pores of the multi-hole emission needle, and enters the inner micropores from the tail of the multi-hole emission needle under the action of gravity and capillary action, so that all the pores are gradually filled until the propellant flows to the needle point, the soaking is complete, the soaking is efficient, and the condition that the propellant stays on the outer surface of the emission needle due to external soaking is avoided; furthermore, the method can be suitable for the infiltration of various propellants by calibrating the infiltration temperatures of different propellants; furthermore, compared with the method that the propellant is remained on the outer surface of the transmitting needle after the transmitting needle is infiltrated, and the propellant is easy to pollute or remove in the assembling process, the method realizes that the propellant in the pores of the porous transmitting needle restores to be solid again by closing the heating device before the infiltrating is finished, so that the solid propellant is remained in the pores of the porous transmitting needle and cannot leak out, and the propellant is not easy to pollute by the external environment, and has the advantage of high reliability.

Drawings

FIG. 1 is a schematic view of a porous emitter needle infiltration apparatus in a first infiltration state according to an embodiment of the present invention;

FIG. 2 is a schematic view of a multi-hole emitter needle infiltration apparatus in a second infiltration state according to an embodiment of the present invention;

FIG. 3 is a schematic view of a porous emitter needle infiltration apparatus positioned within a vacuum chamber in accordance with an embodiment of the present invention;

shown in the figure: 10-a soaking module; 11-a storage chamber; 12-a porous emitter needle; 20-a heating device; 30-a base; 40-three-jaw chuck; 50-a connecting rod; 60-a support frame; 70-a vacuum chamber; 71-power supply.

Detailed Description

The porous emitter needle infiltration apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The core idea of the invention is to provide a porous emission needle infiltration device and a method thereof, so as to solve the problem that the existing external infiltration method is not suitable for infiltration of porous emission needles.

In order to realize the above thought, the invention provides a porous emission needle infiltration device and a method, wherein the porous emission needle infiltration device comprises an infiltration module and a heating device which are vertically and oppositely arranged, wherein: the infiltration module is configured to be capable of moving up and down relative to the heating device to be in a first infiltration state, a second infiltration state or a third infiltration state; the infiltration module comprises a storage chamber, a multi-hole emission needle and a solid propellant, wherein the storage chamber and the multi-hole emission needle are coaxial and are sequentially connected from top to bottom; the first wetting state comprises: the infiltration module is completely suspended above the heating device, and the pores of the porous emission needle are communicated; the second wetting state comprises: the infiltration module is completely immersed in the heating device, the heating device is started, and the propellant is melted and flows into the pores of the porous emission needle through the action of gravity and the action of capillary; the third wetting state comprises: and the heating device is closed, and the propellant in the pores of the porous emission needle restores the solid state again so as to finish the infiltration work of the porous emission needle before assembly.

< example one >

The present embodiment provides a porous emission needle infiltration apparatus, as shown in fig. 1-2, the porous emission needle infiltration apparatus includes an infiltration module 10 and a heating apparatus 20, which are vertically and oppositely arranged, wherein: the infiltration module 10 is configured to be capable of moving up and down relative to the heating device 20 to be in a first infiltration state, a second infiltration state or a third infiltration state; the infiltration module 10 comprises a storage chamber 11 and a multi-hole emission needle 12 which are coaxial and sequentially connected from top to bottom, and a solid propellant contained in the storage chamber 11; the first wet state is shown in fig. 1 and includes: the infiltration module 10 is completely suspended above the heating device 20, and the pores of the porous emission needle 12 are through; the second wet state is shown in fig. 2, and includes: the infiltration module 10 is completely immersed in the heating device 20, the heating device 20 is turned on, and the propellant is melted and flows into the pores of the porous emission needle 12 under the action of gravity and capillary action; the third wetting state comprises: the heating device 20 is turned off, and the propellant in the pores of the multi-hole emitter pin 12 is returned to a solid state, so that the infiltration of the multi-hole emitter pin 12 before assembly is completed.

Specifically, in the porous emission needle infiltration device, the tail part of the porous emission needle 12 is fixed in the storage chamber 11, and the needle point of the porous emission needle 12 is located outside the storage chamber 11; the needle point of the porous emission needle 12 is vertically downward and faces the heating device 20, and the distance from the needle point to the top surface of the heating device 20 is 100-500 micrometers; the heating device 20 is a cylindrical structure with a concave hole in the center, the inner side wall of the concave hole is provided with a heating wire, and the concave hole is configured to accommodate the infiltration module 10.

Further, in the multi-hole emitting needle infiltration device, the infiltration temperature of the multi-hole emitting needle 12 is calibrated, the heating power of the heating device 20 is calibrated according to the infiltration temperature, and the heating is continuously carried out at the infiltration temperature until the propellant is completely melted, so that the propellant in the storage chamber 11 is transported to the needle point under the action of gravity and capillary action to complete infiltration.

As shown in fig. 1, in the multi-hole emitter needle infiltration apparatus, the multi-hole emitter needle infiltration apparatus further includes a base 30, a three-jaw chuck 40, a connecting rod 50 and a supporting frame 60, wherein: the base 30 is configured to place and fix the heating device 20; the three-jaw chuck 40 is configured to fix the storage chamber 11; the supporting frame 60 is fixedly connected to the base 30, and the three-jaw chuck 40 is fixed through the connecting rod 50; the height of the support bracket 60 is adjustable; the base 30 is horizontally placed in a vacuum chamber 70, and a power supply 71 outside the vacuum chamber 70 supplies power to the heating device 20. The porous emitter pin 12 includes, but is not limited to, tungsten, rhenium; the propellant includes, but is not limited to, indium, gallium, cesium.

In summary, the above embodiments have described the different configurations of the infiltrating device and method for the porous emitting needle 12 in detail, and it is understood that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

< example two >

The embodiment provides a porous emission needle infiltration method, which comprises the following steps: arranging the infiltration module 10 and the heating device 20 vertically and oppositely; the infiltration module 10 moves up and down relative to the heating device 20 to be in a first infiltration state, a second infiltration state or a third infiltration state; coaxially and sequentially connecting a storage chamber 11 of the infiltration module 10 and a porous emission needle 12 from top to bottom, and placing a solid propellant in the storage chamber 11; the first wetting state comprises: the infiltration module 10 is completely suspended above the heating device 20, and the pores of the porous emission needle 12 are through; the second wetting state comprises: the infiltration module 10 is completely immersed in the heating device 20, the heating device 20 is turned on, and the propellant is melted and flows into the pores of the porous emission needle 12 under the action of gravity and capillary action; the third wetting state comprises: the heating device 20 is turned off, and the propellant in the pores of the multi-hole emitter pin 12 is returned to a solid state, so that the infiltration of the multi-hole emitter pin 12 before assembly is completed.

Specifically, in the porous emission needle infiltration method, the height of the support frame 60 is lowered, so that the porous emission needles 12 and the storage chamber 11 are both located inside the heating device 20; when the needle points of the calibration storage chamber 11 and the porous emission needle 12 reach 1000 ℃, the heating power of the heating device 20 forms calibration power; and continuously heating the porous emission needle 12 and the storage chamber 11 under the calibrated power for not less than 10 minutes to finish the infiltration of the porous emission needle 12.

In the porous emission needle infiltration device and the method provided by the invention, the infiltration module 10 is completely suspended above the heating device 20, the pores of the porous emission needles 12 are communicated, the infiltration module 10 is completely immersed in the heating device 20, the heating device 20 is started, the solid propellant is melted and flows into the pores of the porous emission needles 12 under the action of gravity and capillary action, the heating device 20 is closed, the propellant in the pores of the porous emission needles 12 is restored to be solid again, so that the infiltration work of the porous emission needles 12 before assembly is completed, the automatic flowing-down of the melted propellant is realized under the action of gravity and capillary action, the infiltration in the porous emission needles 12 and the needle points is completed, the automatic infiltration of the emission needles of the field emission electric thruster can be realized, the method is simple, and only the heating power and the time of the heating device 20 need to be controlled; in addition, in the multi-hole transmitting needle 12 infiltration method, the propellant flows in the pores of the multi-hole transmitting needle 12, and enters the inner micropores from the tail of the multi-hole transmitting needle 12 under the action of gravity and capillary action, so that all the pores are gradually filled until the propellant flows to the needle point, the infiltration is complete, the infiltration is efficient, and the condition that the propellant stays on the outer surface of the transmitting needle due to external infiltration is avoided; furthermore, the method can be suitable for the infiltration of various propellants by calibrating the infiltration temperatures of different propellants; furthermore, compared with the method that the propellant is remained on the outer surface of the transmitting needle after the transmitting needle is infiltrated, and the propellant is easy to pollute or remove in the assembling process, the method realizes that the propellant in the pores of the multi-hole transmitting needle 12 restores to be solid again by closing the heating device 20 before infiltration is finished, so that the solid propellant is remained in the pores of the multi-hole transmitting needle 12 and cannot leak out, is not easy to pollute by the external environment, and has the advantage of high reliability.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.