CN206314021U - A kind of structure for strengthening electro-arc heater pole strength - Google Patents

Abstract

The utility model discloses a structure for enhancing the strength of an arc heater electrode, which comprises: an electrode inner sleeve and an electrode outer sleeve; One end of the inner cover is connected, and the other end of the electrode outer cover is connected with the other end of the electrode inner cover; the outer surface of the electrode inner cover is provided with several ribs, and the ribs of the electrode inner cover are connected to the electrode inner cover. The inner walls of the electrode casings are connected, wherein a rib groove is arranged between two adjacent ribs; one end of the electrode casing is provided with a first through hole corresponding to each rib groove; the other end of the electrode casing is provided with a The second through hole corresponding to each groove. The utility model enables the electric arc heater to operate stably under the conditions of high power, long time and high pressure operation.

Description

A Structure for Enhancing Electrode Strength of Arc Heater

technical field

The utility model relates to the field of aerospace aerodynamic thermal protection systems, in particular to a structure for enhancing the electrode strength of an arc heater.

Background technique

The arc heater is the core equipment for the thermal protection ground simulation test of domestic and foreign aerospace vehicles. At present, the demand for the performance of the arc heater in the development of domestic models continues to increase, and arc heating equipment with high power, long time, and high arc chamber pressure has become an urgent need for domestic model development, and the arc heater with high power, long time, and high arc chamber pressure The ability to operate and enhance the strength of arc heater electrodes are urgent problems to be solved.

The traditional arc heater electrode adopts the structure of the inner sleeve and the outer sleeve, and the O-ring sealing structure. The advantage of this structure is that once the inner sleeve is burned, it is easy to replace, and it operates under the condition of low power and low arc chamber pressure. Stable, but in the case of high arc chamber pressure, the inner sleeve is prone to bulging or shrinkage deformation. The previous solution to this problem was to increase the wall thickness of the electrode inner sleeve. Although this method can increase the pressure-bearing strength of the electrode inner sleeve, it affects the cooling effect of the electrode inner sleeve and causes serious ablation of the electrode inner sleeve. Improving the strength of the electrode inner sleeve without affecting the cooling of the electrode inner sleeve is an urgent research problem.

Utility model content

The technical problem solved by the utility model is: compared with the prior art, a structure for enhancing the electrode strength of the arc heater is provided, so that the arc heater can run stably under the conditions of high power, long time and high voltage operation.

The purpose of the utility model is achieved through the following technical solutions: a structure for enhancing the strength of the arc heater electrode, including: an electrode inner sleeve and an electrode outer sleeve; wherein, the electrode outer sleeve is set on the electrode inner sleeve, and the electrode outer sleeve One end of the electrode inner sleeve is connected to one end of the electrode inner sleeve, and the other end of the electrode outer sleeve is connected to the other end of the electrode inner sleeve; the outer surface of the electrode inner sleeve is provided with several ribs, and the electrode inner sleeve The ribs of the cover are connected to the inner wall surface of the electrode casing, wherein a rib groove is arranged between two adjacent ribs; one end of the electrode casing is provided with a first through hole corresponding to each rib groove; the electrode The other end of the jacket is provided with second through holes corresponding to the grooves.

In the above-mentioned structure for enhancing the strength of the arc heater electrode, several ribs are evenly distributed along the circumferential direction of the outer surface of the inner electrode sleeve, and correspondingly, several rib grooves are arranged along the outer surface of the inner sleeve of the electrode. direction evenly distributed.

In the above-mentioned structure for enhancing the strength of the arc heater electrode, the electrode inner sleeve is a hollow cylindrical structure, and the inner cavity of the electrode inner sleeve is used for circulating high-temperature airflow.

In the above-mentioned structure for enhancing the strength of the arc heater electrode, the inner sleeve of the electrode is made of red copper.

In the above-mentioned structure for enhancing the strength of the arc heater electrode, the fixed connection between the electrode outer sleeve and the two ends of the electrode inner sleeve is fixedly connected by brazing or diffusion welding.

In the above structure for enhancing the strength of the arc heater electrode, the electrode casing is made of stainless steel.

In the above-mentioned structure for enhancing the strength of the arc heater electrode, the wall thickness of the electrode inner sleeve is 2-3 mm.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The overall structure of the utility model enables the arc heater electrodes to be well cooled and not plastically deformed under high temperature and high arc chamber pressure conditions;

(2) In the utility model, the method of tightly welding the electrode inner sleeve and the electrode outer sleeve together transmits the pressure borne by the electrode inner sleeve to the electrode outer sleeve, thereby improving the pressure bearing strength of the electrode inner sleeve;

(3) The wall thickness and the aspect ratio of the ribs of the electrode inner sleeve of the utility model can both enhance the cooling effect and improve the strength of the electrode inner sleeve;

(4) The utility model adopts brazing or diffusion welding to connect the inner and outer shells. This sealing method is more reliable, and cooling water leakage is not easy to occur under high temperature and high pressure conditions;

(5) In the utility model, the materials selected for the electrode inner sleeve and the electrode outer sleeve are different, and the amount of plastic deformation that occurs under high temperature and high pressure conditions will also be different. Usually, the shrinkage of the electrode inner sleeve will be large, and the deformation of the electrode outer sleeve will be small. , using brazing or diffusion welding to connect the inner sleeve to the outer sleeve, which can effectively inhibit the plastic deformation of the inner sleeve of the electrode and prevent structural failure;

(6) The utility model increases the flow resistance of the cooling water through the ribs, improves the effect of water cooling and heat exchange, and increases the pressure bearing strength of the inner sleeve of the electrode.

Description of drawings

Fig. 1 is the structural representation of the structure of the utility model enhanced arc heater electrode strength;

Fig. 2 is a cross-sectional view along line AA in Fig. 1 .

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Fig. 1 is a structural schematic diagram of a structure for enhancing the strength of an arc heater electrode of the present invention. As shown in FIG. 1 , the structure includes an electrode inner casing 1 and an electrode outer casing 2 . During specific implementation, the electrode inner sleeve 1 is a hollow cylindrical structure, the electrode inner sleeve 1 is made of red copper material, and the inner cavity of the electrode inner sleeve 1 is used for circulating high-temperature airflow. The electrode casing 2 is a hollow cylindrical structure, and the electrode casing 2 is made of stainless steel. in,

The electrode sheath 2 is sleeved on the electrode inner sheath 1 , one end of the electrode sheath 2 is connected to one end of the electrode inner sheath 1 , and the other end of the electrode sheath 2 is connected to the other end of the electrode inner sheath 1 . Specifically, the left end of the electrode outer casing 2 and the left end of the electrode inner casing 1 are welded by brazing or diffusion welding, and the right end of the electrode outer casing 2 and the right end of the electrode inner casing 1 are welded by brazing or diffusion welding. , so that the left end of the electrode outer cover 2 is sealed with the left end of the electrode inner cover 1, the right end of the electrode outer cover 2 is sealed with the right end of the electrode inner cover 1, and the welded end face is guaranteed to be watertight under the 5Mpa water pressure condition. In this embodiment, the electrode inner sleeve and the electrode outer sleeve are made of different materials, and the amount of plastic deformation that occurs under high temperature and high pressure conditions will also be different. Usually, the shrinkage of the electrode inner sleeve will be large, and the deformation of the electrode outer sleeve will be small. Welding or diffusion welding connects the electrode inner sleeve to the electrode outer sleeve, which can effectively inhibit the plastic deformation of the electrode inner sleeve and prevent structural failure.

Several ribs 11 are provided on the outer surface of the electrode inner sleeve 1 , and the ribs 11 of the electrode inner sleeve 1 are connected to the inner wall surface of the electrode outer sleeve 2 , wherein rib grooves 12 are arranged between two adjacent ribs 11 . Specifically, the ribs 11 of the electrode inner casing 1 and the inner wall of the electrode outer casing 2 are welded together by means of brazing or diffusion welding, so that each rib groove 12 is independent of each other. Brazing is used to weld, so that the pressure on the electrode inner sleeve can be effectively transmitted to the electrode outer sleeve, and the pressure bearing strength of the electrode inner sleeve can be enhanced.

One end of the electrode casing 2 is provided with a first through hole 21 corresponding to each groove 12 . Specifically, the left end of the electrode casing 2 is provided with first through holes 21 corresponding to the rib grooves 12, the number of the first through holes 21 is consistent with the number of the rib grooves 12, and each first through hole 21 is corresponding to the first through hole 21. The rib grooves 12 are connected, the first through hole 21 is an oval hole, and the diameter of the first through hole 21 is larger than the width of the rib groove 12, so as to ensure that the cooling water will not be intercepted at the electrode jacket.

The other end of the electrode casing 2 is provided with a second through hole 22 corresponding to each groove 12 . Specifically, the right end of the electrode casing 2 is provided with second through holes 22 corresponding to the rib grooves 12, the number of the second through holes 22 is equal to the number of the rib grooves 12, and each second through hole 22 is corresponding to the rib groove 12. The rib grooves 12 are connected, and the second through hole 22 is an oval hole. The diameter of the second through hole 22 is larger than the width of the rib groove 12, so as to ensure that the cooling water will not be intercepted at the electrode jacket.

During work, by injecting cooling water into each first through hole 21, since the first through hole 21 communicates with each rib groove 12, the cooling water in the first through hole 21 flows into each rib groove 12, and then the cooling water Flow from the left end to the right end of each rib groove 12, the cooling water exchanges heat with the electrode inner sleeve 1 to achieve the effect of cooling the electrode inner sleeve 1, then the cooling water flows out from the right end of the rib groove 12 to the second through hole 22, and finally from the second through hole 22 Two through holes 22 are discharged.

The overall structure of this embodiment enables the arc heater electrode to be cooled well without plastic deformation under the condition of high temperature and high arc chamber pressure; thermal effect, and increased the pressure bearing strength of the electrode inner sleeve; and in this embodiment, the method of tightly welding the electrode inner sleeve and the electrode outer sleeve together transmits the pressure on the electrode inner sleeve to the electrode outer sleeve, which improves the electrode inner sleeve. of bearing strength.

In the above-mentioned embodiment, as shown in FIG. 2, several ribs 11 are evenly distributed along the circumferential direction of the outer surface of the electrode inner sleeve 1, and correspondingly, several rib grooves 12 are distributed along the circumference of the outer surface of the electrode inner sleeve 1. direction evenly distributed. Through this distribution method, the cooling water circulation process is relatively smooth, and heat exchange can be performed effectively, thereby achieving a better cooling effect.

In the above embodiments, the wall thickness of the electrode inner sleeve 1 is 2-3 mm. The height to width ratio of the ribs 11 is 1 to 5 times. This can not only enhance the cooling effect but also improve the strength of the inner sleeve of the electrode.

In the above-mentioned embodiment, several ribs 11 on the outer surface of the electrode inner sleeve 1 have a certain degree of taper, and the inner wall surface of the electrode outer sleeve 2 also has a certain degree of taper, which is the same as the taper of the electrode inner sleeve 1 rib, so that the electrode inner sleeve 1 and the electrode jacket 2 are compressed. Specifically, the taper of the rib 11 of the electrode inner sleeve 1 and the taper of the inner wall surface of the electrode outer sleeve 2 are 1°, that is, the inner diameter of the electrode outer sleeve 2 is a variable diameter structure, and along the direction from the first through hole 21 to the second through hole 22, the electrode The inner diameter of the outer jacket 2 gradually increases to buffer the high-pressure cooling water. The height of the rib 11 increases along the direction from the first through hole 21 to the second through hole 22 .

The overall structure of the utility model enables the arc heater electrode to be well cooled under high temperature and high arc chamber pressure conditions without plastic deformation; the utility model tightly welds the electrode inner sleeve and the electrode outer sleeve together The pressure borne by the cover is transmitted to the electrode outer cover, which improves the pressure bearing strength of the electrode inner cover; the wall thickness of the electrode inner cover and the aspect ratio of the ribs of the utility model can not only enhance the cooling effect but also improve the strength of the electrode inner cover; The utility model adopts brazing or diffusion welding to connect the inner and outer jackets. This sealing method is more reliable, and cooling water leakage is not easy to occur under high temperature and high pressure conditions; in the utility model, the materials selected for the inner electrode jacket and the electrode jacket are different. The amount of plastic deformation that occurs under high temperature and high pressure conditions will also be different. Usually, the shrinkage of the electrode inner sleeve will be large, and the deformation of the electrode outer sleeve will be small. The inner sleeve and the outer sleeve are connected by brazing or diffusion welding, which can effectively suppress The plastic deformation of the inner sleeve of the electrode prevents structural failure; the utility model increases the flow resistance of the cooling water through the ribs, improves the effect of water cooling and heat exchange, and increases the bearing strength of the inner sleeve of the electrode.

The embodiments described above are only preferred specific implementations of the utility model, and ordinary changes and replacements performed by those skilled in the art within the scope of the technical solutions of the utility model should be included in the protection scope of the utility model.

Claims (9)

1. A structure for enhancing the electrode strength of an arc heater, characterized in that it comprises: an inner electrode cover (1) and an electrode outer cover (2); wherein, The electrode sheath (2) is sleeved on the electrode inner sheath (1), one end of the electrode sheath (2) is connected to one end of the electrode inner sheath (1), and the electrode sheath (2) The other end is connected with the other end of the electrode inner sleeve (1); The outer surface of the electrode inner sleeve (1) is provided with several ribs (11), and the ribs (11) of the electrode inner sleeve (1) are connected to the inner wall surface of the electrode outer sleeve (2). A rib groove (12) is arranged between the two ribs (11); One end of the electrode casing (2) is provided with a first through hole (21) corresponding to each rib groove (12); The other end of the electrode casing (2) is provided with second through holes (22) corresponding to the grooves (12). 2. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: several ribs (11) are evenly distributed along the circumferential direction of the outer surface of the inner electrode sleeve (1), and the corresponding , several grooves (12) are evenly distributed along the circumferential direction of the outer surface of the electrode inner sleeve (1). 3. The structure for enhancing the strength of arc heater electrodes according to claim 1, characterized in that: the electrode inner sleeve (1) is a hollow cylindrical structure, and the inner cavity of the electrode inner sleeve (1) is used for circulation Hot air flow. 4. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: the electrode inner sleeve (1) is made of red copper. 5. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: the fixed connection between the electrode outer sleeve (2) and the electrode inner sleeve (1) is fixedly connected by brazing or diffusion welding. 6. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: the electrode casing (2) is made of stainless steel. 7. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: the wall thickness of the electrode inner sleeve (1) is 2-3 mm. 8. The structure for enhancing the strength of arc heater electrodes according to claim 1, characterized in that the ratio of height to width of the ribs (11) is 1 to 5 times. 9. The structure for enhancing the strength of the arc heater electrode according to claim 1, characterized in that: the inner diameter of the electrode casing (2) is a variable diameter structure, along the first through hole (21) to the second through hole ( 22) direction, the inner diameter of the electrode jacket (2) gradually increases to realize the buffering of high-pressure cooling water.