An electrode hydrostatic test bench for an arc heater and its usage method

Abstract

The present invention provides an electrode hydrostatic test bench for an arc heater and its usage method. The structure includes a bottom plate and a platform. The platform and the bottom plate are connected by columns. The platform is provided with a clamping device and a positioning device, and a loading connection mechanism is arranged at the bottom of the clamping device. The present invention can fixedly clamp the inner and outer sleeves of the annular electrode of the arc heater, meet the requirements of its hydrostatic test, and can quickly carry out hydrostatic test and disassembly and assembly operations. It can flexibly change the pre-tightening pressure according to the pressure change of the hydrostatic test, which is significantly higher than the previous hydrostatic test devices.

Description

Technical Field

[0001] The present invention relates to the technical field of arc heater electrode tests, and particularly relates to an arc heater electrode hydrostatic test bench and a using method thereof. Background Art

[0002] Arc heating test equipment is an important equipment for ground simulation tests of aerodynamic heat. It mainly uses high-temperature arcs generated between electrodes to heat air, and then uses corresponding nozzles to form the required high-temperature and high-speed flow fields for ground test research on aerodynamic heat protection. With the development of near-space hypersonic aircraft, the application of high-enthalpy arc heaters is becoming increasingly widespread.

[0003] High-enthalpy arc heaters have characteristics such as many components and complex structures. The key component, the annular electrode, used therein is an integral assembled by an inner and outer sleeve, inlet and outlet water connection nozzles, sealing rings, etc., and needs to be regularly overhauled before the first use or during use. Hydrostatic test is an important overhaul item. Due to structural limitations, special equipment is required to clamp and fix the inner and outer sleeves of the annular electrode during the hydrostatic test to prevent electrode deformation and inner sleeve detachment during the hydrostatic test.

[0004] However, the previous annular electrode hydrostatic test device had a simple structure, the annular electrode had a low pressure bearing capacity (≤0.8 MPa) during the hydrostatic test, and it was not easy to observe water leakage. To improve the efficiency and pressure bearing capacity of the annular electrode hydrostatic test, a hydrostatic test auxiliary device with a simple structure, convenient operation, and high pressure bearing capacity is required. Summary of the Invention

[0005] The purpose of the present invention is to provide an arc heater electrode hydrostatic test bench and a using method thereof, which can improve the efficiency and pressure bearing capacity of the annular electrode during the hydrostatic test.

[0006] According to an object of the present invention, the present invention provides an arc heater electrode hydrostatic test bench, including a bottom plate and a platform. The platform and the bottom plate are connected by columns. A clamping device and a positioning device are provided on the platform, and a loading connection mechanism is provided at the bottom of the clamping device.

[0007] Further, the clamping device includes a lower pressing plate and an upper pressing plate. The lower pressing plate includes a disc body and a sleeve integrally formed with the disc body. A through hole is provided at the central position of the upper pressing plate, and the upper pressing plate is sleeved on the sleeve through the through hole. A locking nut is threadedly connected to the outside of the sleeve.

[0008] Further, the disc body and the sleeve are coaxially arranged, and the outer diameter of the sleeve is smaller than the inner diameter of the annular electrode.

[0009] Further, the loading connection mechanism is connected to the lower pressing plate through a jack rod. The lower pressing plate is arranged above the platform and the jack rod. The bottom of the jack rod is connected to the loading connection mechanism, and the top end of the jack rod penetrates through the platform and is connected to the lower pressing plate.

[0010] Further, a guiding hole is provided in the middle of the platform. The jack rod penetrates through the guiding hole and can slide up and down in the guiding hole.

[0011] Further, a plurality of uniformly distributed water guiding grooves are provided at the edge of the lower pressing plate.

[0012] Further, a plurality of uniformly distributed fan-shaped slot holes are provided on the upper pressing plate.

[0013] Further, the positioning device includes a plurality of pairs of arcuate pressing plates. A plurality of chutes in an inverted T-shaped structure are formed at the top of the platform. An inverted T-shaped slider is integrally formed at the bottom of the arcuate pressing plate. The arcuate pressing plate is slidably connected in the chute of the platform through the slider at the bottom.

[0014] Further, the loading connection mechanism includes an upper connection block, a lower connection block, a left connection block and a right connection block. The lower connection block is fixedly connected to the bottom plate. The upper connection block is fixedly connected to the bottom of the jack rod. Connecting rods are hingedly connected between the left connection block and the upper and lower connection blocks, and between the right connection block and the upper and lower connection blocks. Threaded holes with opposite rotation directions are respectively formed in the left connection block and the right connection block. A loading screw rod is threadedly connected in the threaded holes in the left connection block and the right connection block.

[0015] According to another object of the present invention, the present invention provides a method for using an electrode hydrostatic test bench of an arc heater, including the following steps:

[0016] S1. Place the annular electrode between the lower pressing plate and the upper pressing plate, and tighten the locking nut to lock the annular electrode between the lower pressing plate and the upper pressing plate;

[0017] S2. Move a plurality of arcuate pressing plates inward, and buckle the edge of the annular electrode through the protruding parts on the upper parts of the arcuate pressing plates;

[0018] S3. Rotate the loading screw rod, the upper connection block drives the jack rod to rise upward to press tightly against the lower pressing plate. The edge of the annular electrode is buckled by the protruding parts of the arcuate pressing plates, and the annular electrode is clamped under the combined action of the lower pressing plate and the arcuate pressing plates.

[0019] The technical solution of the present invention can fixedly clamp the inner and outer sleeves of the annular electrode of the arc heater, meet the needs of its hydrostatic test, and can quickly carry out the hydrostatic test and disassembly operations. It can flexibly change the preloading pressure according to the pressure change of the hydrostatic test, which is significantly higher than the previous hydrostatic test devices. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 Structural schematic diagram when an embodiment of the present invention is in use;

[0023] Figure 3 For an embodiment of the present invention Figure 1 Cross-sectional view;

[0024] Figure 4 For an embodiment of the present invention Figure 2 Cross-sectional view;

[0025] In the figure, 1, base plate; 2, column; 3, loading screw; 4, loading connection mechanism; 401, upper connection block; 402, lower connection block; 403, left connection block; 404, right connection block;

[0026] 5, ejector rod; 6, lower pressing plate; 601, disc body; 602, sleeve; 603, positioning groove;

[0027] 7, upper pressing plate; 8, locking nut; 9, bow-shaped pressing plate; 10, platform; 11, connecting rod; 12, guiding hole; 13, sliding groove; 14, slider; 15, annular electrode; 16, water guide groove; 17, fan-shaped slot hole. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] As Figures 1-4 shown,

[0033] An electrode hydrostatic test bench for an arc heater includes a bottom plate 1, a column 2, a loading screw 3, a loading connection mechanism 4, a push rod 5, a lower pressing plate 6, an upper pressing plate 7, a locking nut 8, a bow-shaped pressing plate 9, and a platform 10.

[0034] The bottom plate 1 is fixedly connected to the platform 10 through the column 2. Specifically, connecting flanges are respectively fixed at the top and bottom of the column 2, and the column 2 is fixedly connected to the top of the bottom 1 and the bottom of the platform 10 through bolts by means of the flanges.

[0035] The loading connection mechanism 4 is composed of four connecting plates and four connecting blocks. The four connecting blocks include an upper connecting block 401, a lower connecting block 402, a left connecting block 403, and a right connecting block 404. Among them, the lower connecting block 402 is fixedly connected to the bottom plate 1. Specifically, the lower connecting block 402 is fixedly connected to the bottom plate 1 through bolts. A threaded hole is provided on the bottom plate 1, and a through hole is provided on the lower connecting block 4021. After the bolt passes through the through hole on the lower connecting block 402, it is screwed into the threaded hole on the bottom plate 1 to fix the lower connecting block 402 and the bottom plate 1 together.

[0036] A connecting rod 11 is hinged between the left connecting block 403 and the upper connecting block 401 and the lower connecting block 402, and between the right connecting block 404 and the upper connecting block 401 and the lower connecting block 402 respectively. Threaded holes with opposite helix directions are respectively formed in the left connecting block 403 and the right connecting block 404. The loading screw rod 3 sequentially passes through the threaded holes in the right connecting block 404 and the left connecting block 403, and the loading screw rod 3 is threadedly connected to the left connecting block 403 and the right connecting block 404. By rotating the loading screw rod 3 clockwise, the left connecting block 403 and the right connecting block 404 can approach each other, thereby driving the upper connecting block 401 of the loading connection mechanism 4 to rise. On the contrary, by rotating the loading screw rod 3 counterclockwise, the upper connecting block 401 can be lowered.

[0037] A guiding hole 12 is provided in the middle of the platform 10. After the ejector rod 5 passes through the guiding hole 12 in the platform 10, the bottom of the ejector rod 5 is fixedly connected to the upper connecting block 401. Specifically, a threaded hole is provided in the upper connecting block 401, and an external thread is provided at the bottom of the ejector rod 5. The bottom of the ejector rod is threadedly connected to the upper connecting block 401 through the thread to realize the fixation of the two. In this way, by rising or lowering the upper connecting block 401, the ejector rod 5 connected thereto can be driven to rise or lower.

[0038] Four sliding grooves 13 are formed at the top of the platform 10. The four sliding grooves 13 are evenly distributed at the top of the platform 10. The cross-section of the sliding groove 13 is in an inverted T-shaped structure. A bow-shaped pressing plate 9 is slidably arranged in each sliding groove 13. A slider 14 is integrally formed at the bottom of the bow-shaped pressing plate 9. The cross-sectional shape of the slider 14 matches that of the sliding groove 13, and the cross-section of the slider 14 is also in an inverted T-shaped structure. Each bow-shaped pressing plate 9 can slide in the corresponding sliding groove 13 through the slider 14 at the bottom.

[0039] The lower pressing plate 6 includes a disc body 601 and a sleeve 602 integrally formed with the disc body 601. The disc body 601 and the sleeve 602 are coaxially arranged. The outer diameter of the sleeve 602 is smaller than the inner diameter of the annular electrode 15. The lower pressing plate 6 is arranged above the platform 10 and the ejector rod 5, and a positioning groove 603 is provided at the bottom of the disc body 601 of the lower pressing plate 6. The lower pressing plate 6 is buckled on the top of the ejector rod 5 through the positioning groove 603. By rising the ejector rod 5, the lower pressing plate 6 can be driven to move upward. In order to improve the stability of the lower pressing plate 6 when placed above the ejector rod 5, the diameter of the top of the ejector rod 5 can be increased, and the diameter of the positioning groove at the bottom of the lower pressing plate 6 corresponds to the diameter of the top of the ejector rod 5. Through the larger contact area, when the lower pressing plate 6 is placed on the top of the ejector rod 5, the lower pressing plate 6 will not tilt or fall.

[0040] A through hole is provided at the center position of the upper pressure plate 7. The upper pressure plate 7 is sleeved on the sleeve 602 through the through hole. External threads are provided on the outer side of the sleeve 602. A locking nut 8 is sleeved on the sleeve 602. The annular electrode 15 arranged between the lower pressure plate 6 and the upper pressure plate 7 can be locked by the locking nut 8.

[0041] Eight evenly distributed water guide grooves 16 with a width of about 10 mm and an angle of about 15° are provided at the edge of the lower pressure plate 6. The function of the water guide grooves 16 is that when a hydrostatic test is carried out, if water leaks at the joint on the lower surface of the annular electrode (the joint between the inner and outer sleeves), the leaked water can flow out through the water guide grooves 16, so that the water leakage situation on the lower surface of the annular electrode can be detected in time.

[0042] Four evenly distributed fan-shaped slot holes 17 are provided on the upper pressure plate 7. The function of the fan-shaped slot holes 17 is also to facilitate observing the water leakage situation on the upper surface of the annular electrode during the hydrostatic test. Without the fan-shaped slot holes 17, the water leakage situation of the annular electrode during the hydrostatic test cannot be detected in time.

[0043] During use, the lower pressure plate 6 is buckled on the top of the ejector rod 5 through the positioning groove. The annular electrode 15 is placed on the disk body 601 of the lower pressure plate 6. At this time, the sleeve 602 passes through the central hole of the annular electrode 15. The upper pressure plate 7 is sleeved on the sleeve 602, and the annular electrode 15 is locked between the lower pressure plate 6 and the upper pressure plate 7 by tightening the locking nut 8.

[0044] Then, by adjusting the four bow-shaped pressure plates 9 to move closer inward, the edge of the annular electrode 15 is buckled by the protruding part on the upper part of the bow-shaped pressure plate 9. At this time, by rotating the loading screw 3 clockwise, the upper connecting block 401 and the ejector rod 5 are driven to rise, realizing the upward movement of the lower pressure plate 6 driving the annular electrode 15. Since when the annular electrode 15 moves upward, the edge of the annular electrode 15 is buckled by the protruding part of the bow-shaped pressure plate 9, the annular electrode 15 is subjected to the pressure from the lower pressure plate 6. By adopting the above device of the present invention, the annular electrode can be clamped and fixed to prevent the deformation of the electrode and the detachment of the inner sleeve during the hydrostatic test.

[0045] In this embodiment, in order to adapt to the dimensions of conventional annular electrodes, the diameter of the platform 10 is designed to be about 300 mm. Four sliding grooves 13 are evenly arranged at intervals of 90° on the top of the platform 10. In this embodiment, both the lower pressure plate 6 and the upper pressure plate 7 can be replaced with appropriate dimensions according to the diameter of the annular electrode. Specifically, when in use, the lower pressure plate 6 and the upper pressure plate 7 can be designed into three specifications of large, medium and small, and the corresponding specifications can be replaced according to the diameter of the annular electrode.

[0046] The electrode hydrostatic test bench of the present invention for arc heaters can fixedly clamp the inner and outer sleeves of the annular electrodes of the arc heaters to meet the requirements of their hydrostatic tests. It has a simple structure and is convenient to use, and can quickly carry out hydrostatic tests and disassembly and assembly operations. It can flexibly change the pre-tightening pressure according to the pressure change of the hydrostatic test, with a maximum bearing pressure of 1.5 MPa, significantly higher than the previous hydrostatic test devices. Different lower pressing plates and upper pressing plates can be selected according to different electrode size specifications, and the replacement is convenient and the universality is strong.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrode hydrostatic test bench for an arc heater, characterized in that, It includes a bottom plate and a platform. The platform and the bottom plate are connected by columns. A clamping device and a positioning device are provided on the platform. A loading connection mechanism is provided at the bottom of the clamping device. The clamping device includes a lower pressing plate and an upper pressing plate. The lower pressing plate includes a disc body and a sleeve integrally formed with the disc body. A through hole is provided at the central position of the upper pressing plate. The upper pressing plate is sleeved on the sleeve through the through hole. A locking nut is threadedly connected to the outer side of the sleeve. The positioning device includes a plurality of pairs of arcuate pressing plates. A plurality of inverted T-shaped chutes are formed at the top of the platform. An inverted T-shaped slider is integrally formed at the bottom of the arcuate pressing plate. The arcuate pressing plate is slidably connected to the chute on the platform through the slider at the bottom. A plurality of uniformly distributed water guide grooves are provided at the edge of the lower pressing plate. A plurality of uniformly distributed fan-shaped slot holes are provided on the upper pressing plate.

2. The hydrostatic test bench for the arc heater electrode according to claim 1, wherein The disc body and the sleeve are coaxially arranged, and the outer diameter of the sleeve is smaller than the inner diameter of the annular electrode.

3. The hydrostatic test bench for the arc heater electrode according to claim 1, characterized in that The loading connection mechanism is connected to the lower pressing plate through a top rod. The lower pressing plate is arranged above the platform and the top rod. The bottom of the top rod is connected to the loading connection mechanism, and the top end of the top rod penetrates through the platform and is connected to the lower pressing plate.

4. The electrode hydrostatic test bench for arc heater according to claim 3, characterized in that, A guide hole is provided in the middle of the platform. The top rod penetrates through the guide hole and can slide up and down in the guide hole.

5. The hydrostatic test bench for the arc heater electrode according to claim 4, characterized in that, The loading connection mechanism includes an upper connection block, a lower connection block, a left connection block and a right connection block. The lower connection block is fixedly connected to the bottom plate. The upper connection block is fixedly connected to the bottom of the top rod. Connecting rods are hingedly connected between the left connection block and the upper and lower connection blocks, and between the right connection block and the upper and lower connection blocks. Threaded holes with opposite rotation directions are respectively formed in the left connection block and the right connection block. A loading screw is threadedly connected to the threaded holes in the left connection block and the right connection block.

6. The method for using the hydrostatic test bench for the arc heater electrode according to claim 5, characterized in that, It includes the following steps: S1. Place the annular electrode between the lower pressing plate and the upper pressing plate, and tighten the locking nut to lock the annular electrode between the lower pressing plate and the upper pressing plate. S2. A plurality of arcuate pressing plates move inwardly, and the edge of the annular electrode is buckled by the protruding part on the upper part of the arcuate pressing plate. S3. Rotate the loading screw, the upper connection block drives the top rod to rise upward to press tightly against the lower pressing plate. The edge of the annular electrode is buckled by the protruding part of the arcuate pressing plate. The annular electrode is clamped under the combined action of the lower pressing plate and the arcuate pressing plate.

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