CN115236362A - Voltage test fixture is dropped under cracked atmospheric pressure of prevention insulator - Google Patents
Voltage test fixture is dropped under cracked atmospheric pressure of prevention insulator Download PDFInfo
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- CN115236362A CN115236362A CN202210751795.4A CN202210751795A CN115236362A CN 115236362 A CN115236362 A CN 115236362A CN 202210751795 A CN202210751795 A CN 202210751795A CN 115236362 A CN115236362 A CN 115236362A
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- insulator
- lower shell
- voltage test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The application belongs to the technical field of ignition electric nozzle testing, and particularly relates to a discharge voltage test fixture for preventing the air pressure of an insulator from being cracked. The test fixture comprises a lower shell (17), wherein the top end of a cylinder body of the lower shell is provided with an internal thread on the inner wall surface; the upper shell (11) is assembled at the top end of the cylinder body of the lower shell (17) through threaded connection; an insulating bush (16) is provided in the lower case (17) with a top contact surface; the rubber ring (9) is arranged between the top end extrusion surface of the lower shell (17) and the top wall of the discharge voltage test bench; the outer side of the head of the insulator (8) is a conical surface and is sleeved with a side electrode (13), a center electrode (12) is installed at the center of the insulator, the top contact surface of an insulating bush (16) is pressed at the step of the insulator from bottom to top, and the end face of the bottom end of the upper shell (11) is pressed on the side electrode at the head of the insulator from top to bottom, so that the insulator is fixed in the lower shell. The present application reduces the risk of cracking during insulator assembly.
Description
Technical Field
The application belongs to the technical field of ignition electric nozzle testing, and particularly relates to a discharge voltage test fixture for preventing the air pressure of an insulator from being cracked.
Background
The semiconductor electric nozzle is an important ignition product in an ignition system of an aircraft engine, and mainly has the function of converting high-voltage electric energy provided by an ignition device into electric sparks with certain energy through breakdown discharge at a discharge gap of the semiconductor electric nozzle so as to ignite air-fuel mixed gas in a combustion chamber of the engine. In order to ensure the working reliability of the semiconductor nozzle, the top end of the insulator in the semiconductor nozzle is generally provided with a semiconductor glaze, so that the insulator needs to be subjected to a gas pressure minimum discharge voltage test to screen out the insulator meeting the requirement.
During testing, the insulator is tightly assembled in a special test fixture, and as shown in figure 1, the original lower shell 7 and the original support plate 4 are welded into a whole through argon arc welding; the original connecting rod 5 penetrates into an original insulating bush 6 and then is arranged in an original lower shell 7 together; filling a proper amount of sealant into the original lower shell 7, and pressing the other original insulating bush 6 into the original lower shell 7; induction heating the sealant part and pressing the two original insulation bushings 6 to ensure that the special test fixture is airtight; the original center electrode 2 is penetrated through an insulator 8 (a test piece) and screwed to the original connecting rod 5; the primary electrode 3 is sleeved on the insulator 8; screwing the original upper shell 1 to the original lower shell 7, finally placing the rubber ring 9 on the original upper shell 1, then installing the rubber ring on a test board for the minimum discharge voltage, switching on a power supply, adjusting the air pressure to a specified value, then gradually loading the voltage between the two electrodes from low to high, and carrying out discharge test until electric sparks are generated, wherein the loaded voltage is the minimum discharge voltage under the air pressure.
The problem that exists at present is that the insulator 8 that is taken out from the special test fixture after the test has the fragmentation phenomenon, causes the insulator 8 to scrap, and this test fixture causes the quality hidden danger to the insulator 8 that does not fragment simultaneously, has reduced the reliability of semiconductor electric nozzle work. The reason why the insulator 8 is cracked is: the insulator 8 is tightly fitted in a dedicated test fixture during testing, which would otherwise cause inaccurate test results. As can be seen from figure 1, the insulator 8 is jointed with the original connecting rod 5 at the position A, the joint part of the insulator 8 is the position where the wall thickness of the insulator 8 is the smallest and weakest, and the end surface of the part of some insulators 8 has the concave-convex uneven phenomenon, which causes the local stress to increase; meanwhile, when the test fixture is installed on the minimum discharge voltage test bench, the rubber ring 9 is tightly matched with the original shell 1, and the air tightness of a discharge part under the air pressure of 1MPa can be ensured, so that when the air-tight device of the minimum discharge voltage test bench is screwed, the original shell 1 special for the test fixture is further screwed along with the rubber ring 9, the insulator 8 is stressed for the second time, the insulator 8 is cracked, the uncracked insulator 8 is damaged, and hidden dangers are caused to the quality of the semiconductor electric nozzle.
Disclosure of Invention
In order to solve the problem, the application provides a discharge voltage test fixture under the cracked atmospheric pressure of insulator prevents, the cracked risk when reducing the insulator assembly.
The application provides a prevent insulator cracked atmospheric pressure discharge voltage test fixture mainly includes:
the lower shell is of a hollow cylinder structure and is fixed in the discharge voltage test board, internal threads are arranged on the inner wall surface of the top end of the cylinder, and the top end of the cylinder is provided with an annular extrusion surface D;
the upper shell is provided with an external thread and is assembled at the top end of the cylinder body of the lower shell through threaded connection;
the insulating bush is arranged in the lower shell, the top end of the insulating bush is provided with a top joint surface C, and the center of the insulating bush is provided with an accommodating space;
the rubber ring is arranged between the top extrusion surface D of the lower shell and the top wall of the discharge voltage test bench;
the outer side of the head of the insulator is a conical surface and is sleeved with a side electrode, the center of the insulator is provided with a center electrode, the tail end of the insulator of the center electrode is connected with a connecting rod, the connecting rod extends out of the discharge voltage test bench through an accommodating space of an insulating bush, a top connecting surface C of the insulating bush is extruded at the step of the insulator from bottom to top, and the end surface of the bottom end of the upper shell is extruded on the side electrode at the head of the insulator from top to bottom, so that the insulator is fixed in the lower shell.
Preferably, a clearance fit is formed between the part of the upper shell exposed out of the lower shell and the rubber ring.
Preferably, the insulation bushing is made of bakelite.
Preferably, the barrel bottom of casing has the annular step of inside shrink down, insulating bush includes the great first cylinder of external diameter and the less second cylinder of external diameter, first cylinder with form the extrusion step between the second cylinder, first cylinder is located the casing down, and the extrusion step is extruded on the annular step internal face B of casing down, stretch out outside the casing down after the annular step of casing is passed to the second cylinder.
Preferably, the discharge voltage test platform is a closed container, and atmospheric pressure is applied to the lower shell through an air pressure inlet of the top wall.
Preferably, a support plate is fixedly connected to the outer side of the lower shell, and the support plate is in pressure joint with an inner ring surface at an opening at the bottom end of the discharge voltage test board.
Preferably, the support plate is welded on the outer side of the lower shell through argon arc welding, one side surface of the support plate abuts against a spigot A on the outer side of the lower shell, and the other side surface of the support plate is pressed on an inner ring surface of an opening at the bottom end of the discharge voltage test table.
The present application reduces the risk of cracking during insulator assembly.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a prior art test fixture.
FIG. 2 is a schematic diagram of a discharge voltage test performed by the test fixture shown in FIG. 1.
Fig. 3 is a schematic structural view of a preferred embodiment of the discharging voltage test fixture under air pressure for preventing the insulator from being cracked according to the present application.
Fig. 4 is a schematic diagram of the test fixture of the embodiment of fig. 3 of the present application assembled to a discharge voltage test stand for testing.
Wherein, 1-original upper shell, 2-original central electrode, 3-original side electrode, 4-original support plate, 5-original connecting rod, 6-original insulating bush, 7-original lower shell, 8-insulator, 9-rubber ring, 11-upper shell, 12-central electrode, 13-side electrode, 14-support plate, 15-connecting rod, 16-insulating bush and 17-lower shell.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are illustrative and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments that can be derived by a person skilled in the art from the embodiments given herein without making any creative effort fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
Referring to fig. 1 and 2, the problem of the conventional special test fixture is that the insulator 8 is cracked when the minimum discharge voltage is tested under the air pressure of the insulator 8, because the weakest part of the insulator 8 is extruded twice in the assembling process, one time, the insulator 8 is normally stressed when being arranged in the special test fixture, and the other time, the insulator 8 is abnormally extruded when being arranged on the minimum discharge voltage test table, so that part of the insulator 8 is cracked.
The application provides a discharge voltage test fixture under atmospheric pressure of preventing insulator is cracked, insulator 8 is hollow structure, and it includes head and afterbody, and head external diameter is greater than afterbody external diameter to form the step between head and afterbody, refer to fig. 3, test fixture includes:
the lower shell 17 is of a hollow cylinder structure and is fixed in the discharge voltage test board, the top end of the cylinder is provided with internal threads on the inner wall surface, and the top end of the cylinder is provided with an annular extrusion surface D;
an upper housing 11 having an external thread and assembled at a cylindrical top end of the lower housing 17 by screw-coupling;
the insulating bush 16 is arranged in the lower shell 17, the top end of the insulating bush is provided with a top joint surface C, and the center of the insulating bush is provided with a containing space;
the rubber ring 9 is arranged between the top end extrusion surface D of the lower shell 17 and the top wall of the discharge voltage test bench;
the outer side of the head of the insulator 8 is a conical surface and is sleeved with a side electrode 13, a center electrode 12 is installed in the center of the insulator 8, the tail end of the insulator 8 is connected with a connecting rod 15 of the center electrode 12, the connecting rod 15 extends out of a discharge voltage test bench through an accommodating space of an insulating bush 16, a top connection surface C of the insulating bush 16 is pressed at a step of the insulator 8 from bottom to top, and the end surface of the bottom end of the upper shell 11 is pressed on the side electrode 13 of the head of the insulator 8 from top to bottom, so that the insulator 8 is fixed in the lower shell.
In order to solve the problem of cracking of the insulator 8, the stress position of the insulator 8 is firstly adjusted to the position with the largest wall thickness of the insulator 8 (namely, the position of a top joint surface C in fig. 3), the risk of cracking of the insulator 8 during assembling is reduced, meanwhile, the upper shell 11 is changed into an internal thread, the size of the outer circle of the upper shell 11 is reduced, a gap exists between the inner wall of the rubber ring 9 and the outer circle of the upper shell 11, and when the test fixture is assembled on the test bench for the minimum discharge voltage, the rubber ring 9 cannot generate acting force on the upper shell 11, and the acting force is loaded on the lower shell 17 (namely, the position of a squeezing surface D in fig. 3).
This application insulator 8's stress position is not in insulator 8 weakest department when the assembly, avoids insulator 8 to receive the secondary extrusion moreover, solves insulator 8 and gives off the cracked problem of voltage test time under atmospheric pressure, improves test procedure insulator 8 qualification rate, reduces semiconductor electric nozzle quality hidden danger, improves semiconductor electric nozzle operational reliability.
According to the clamp for discharging the voltage under the air pressure for preventing the insulator from being cracked, the original material of the insulating bush 6 is changed from alumina ceramic to bakelite, sealant is omitted, and tight fit and extrusion sealing are adopted; the insulator 8 is supported by the original connecting rod 5 (stainless steel) instead of the insulating bush 16 (bakelite), so that the insulator 8 is stressed to have buffering and elasticity; in addition, the rubber ring 9 does not act on the upper shell 11 any more, so that the insulator 8 is not extruded for the second time, and therefore after the performance of the insulator 8 is tested by using the atmospheric pressure discharging voltage testing clamp disclosed by the application, the insulator 8 does not have a fragmentation phenomenon any more, and the testing pass rate of the insulator 8 is improved.
In some alternative embodiments, the portion of the upper shell 11 exposed outside the lower shell 17 is in clearance fit with the rubber ring 9.
In some alternative embodiments, the insulation bushing 16 is made of bakelite.
In some optional embodiments, the bottom end of the cylinder of the lower casing 17 has an annular step shrinking inward, the insulating bush 16 includes a first cylinder with a larger outer diameter and a second cylinder with a smaller outer diameter, a pressing step is formed between the first cylinder and the second cylinder, the first cylinder is located in the lower casing 17, the pressing step is pressed on the inner wall surface B of the annular step of the lower casing 17, and the second cylinder passes through the annular step of the lower casing 17 and then extends out of the lower casing 17.
In some alternative embodiments, the discharge voltage testing station is a closed container, and atmospheric pressure is applied to the lower housing 17 through the air pressure inlet of the top wall.
In some alternative embodiments, a support plate 14 is fixedly connected to the outer side of the lower shell 17, and the support plate 14 is pressed on an inner annular surface at the opening at the bottom end of the discharge voltage test platform.
In some alternative embodiments, the support plate 14 is welded outside the lower shell 17 by argon arc welding, one side surface of the support plate 14 abuts against a spigot a outside the lower shell 17, and the other side surface of the support plate 14 is pressed on an inner ring surface at the opening at the bottom end of the discharge voltage test platform.
Referring to fig. 2 and 4, the main differences between the two test fixtures are:
a. former special test fixture can produce secondary pressurization to insulator 8 when assembling on the discharge voltage testboard, causes insulator 8 cracked, and the test fixture of this application can not produce secondary pressurization, and insulator 8 can not cracked.
b. The clamp of the application has the advantages that the lower shell 17 is provided with the inner step and the outer step (B, A in the figure 4), all parts are blocked and fixed by the two steps, and the situation that when the airtight device is screwed down and the air pressure is increased, the parts in the clamp are loosened and impact out of the clamp is avoided, so that the test clamp is safer to use.
c. Because two test fixture size and structure are different, when installing the test bench, the assembly quantity of rubber circle 9 will have the difference, as long as can guarantee the assembly gas tightness can.
This application carries out this application test fixture's processing according to following step:
1. the upper housing 11 is machined in one piece from a stainless steel rod.
2. The center electrode 12 and the side electrode 13 were each machined in one piece with a high temperature alloy GH 3044.
3. The plate 14 and the connecting rod 15 are each machined in one piece from stainless steel.
4. The insulation bushing 16 is machined in one piece from a bakelite rod.
5. The lower case 17 is machined in one piece from stainless steel.
6. And processing a plurality of rubber rings 9 by using a rubber rod. The thickness of the rubber ring 9 can be adjusted according to the effect of assembling air tightness.
7. The support plate 14 is sleeved on the outer step of the lower shell 17 and welded at the joint of the two parts by argon arc welding.
8. The small outer circle end of the connecting rod 15 penetrates through the large hole end of the insulating bush 16 and is pressed tightly, and the sealing performance is guaranteed.
9. The insulating bush 16 (including the connecting rod 15) is inserted into and pressed against the lower housing 17, ensuring the tightness.
10. The insulator 8 is sleeved on the central electrode 12, then the central electrode 12 is screwed on the connecting rod 15, the side electrodes 13 are sleeved on the conical surface of the insulator 8, and finally the upper shell 11 is screwed on the lower shell 17. A plurality of rubber rings 9 are sleeved on the upper shell 11 to ensure that the discharge voltage test board is airtight when the discharge voltage test board is assembled.
The test fixture processed according to the process tests 50 pieces of minimum discharge voltage of a certain insulator part under the air pressure of 1MPa, the phenomenon of insulator fragmentation does not occur, the test result is accurate and reliable in verification, and the qualification rate is 100 percent
Although the present application has been described in detail with respect to the general description and specific embodiments, it will be apparent to those skilled in the art that certain modifications or improvements may be made based on the present application. Accordingly, such modifications and improvements are intended to be within the scope of this invention as claimed.
Claims (7)
1. An atmospheric pressure discharging voltage test jig for preventing insulator from being chipped, the insulator (8) being a hollow structure including a head portion and a tail portion, an outer diameter dimension of the head portion being larger than an outer diameter dimension of the tail portion and forming a step between the head portion and the tail portion, the test jig comprising:
the lower shell (17) is of a hollow cylinder structure and is fixed in the discharge voltage test table, the top end of the cylinder is provided with internal threads on the inner wall surface, and the top end of the cylinder is provided with an annular extrusion surface D;
an upper shell (11) which is provided with an external thread and is assembled at the top end of the cylinder body of the lower shell (17) through threaded connection;
the insulation bushing (16) is arranged in the lower shell (17), the top end of the insulation bushing is provided with a top contact surface C, and the center of the insulation bushing is provided with an accommodating space;
the rubber ring (9) is arranged between the top end extrusion surface D of the lower shell (17) and the top wall of the discharge voltage test bench;
the outer side of the head of the insulator (8) is a conical surface and is sleeved with a side electrode (13), a center electrode (12) is installed at the center of the insulator (8), the tail end of the center electrode (12) of the insulator (8) is connected with a connecting rod (15), the connecting rod (15) extends out of a discharge voltage test bench through an accommodating space of an insulating bush (16), a top contact surface C of the insulating bush (16) is extruded at the step of the insulator (8) from bottom to top, and the end surface of the bottom end of the upper shell (11) is extruded on the side electrode (13) at the head of the insulator (8) from top to bottom, so that the insulator (8) is fixed in the lower shell.
2. The discharge voltage test fixture under atmosphere for preventing insulator from cracking according to claim 1, wherein the portion of the upper shell (11) exposed outside the lower shell (17) is in clearance fit with the rubber ring (9).
3. The discharge voltage test fixture under atmospheric pressure for preventing insulator breakdown of claim 1, characterized in that the insulation bushing (16) is made of bakelite.
4. The clamp for testing discharging voltage under air pressure for preventing insulator from being cracked according to claim 1, wherein the bottom end of the cylinder of the lower shell (17) is provided with an annular step which is inwardly contracted, the insulating bush (16) comprises a first cylinder with a larger outer diameter and a second cylinder with a smaller outer diameter, a compression step is formed between the first cylinder and the second cylinder, the first cylinder is positioned in the lower shell (17), the compression step is compressed on the inner wall surface B of the annular step of the lower shell (17), and the second cylinder passes through the annular step of the lower shell (17) and then extends out of the lower shell (17).
5. The atmospheric discharge voltage test jig for preventing insulator from chipping according to claim 1, wherein the discharge voltage test table is a hermetic container, and atmospheric pressure is applied to the lower case (17) through an atmospheric inlet of the ceiling wall.
6. The clamp for the discharge voltage test under the atmosphere for preventing the insulator from being cracked according to claim 1, wherein a support plate (14) is fixedly connected to the outer side of the lower shell (17), and the support plate (14) is pressed on an inner annular surface of an opening at the bottom end of the discharge voltage test bench.
7. The atmospheric discharge voltage test fixture for preventing insulator from cracking as set forth in claim 6, characterized in that said support plate (14) is welded to the outside of the lower shell (17) by argon arc welding, one side surface of the support plate (14) abuts against a spigot A on the outside of the lower shell (17), and the other side surface of the support plate (14) is pressed against the inner annular surface of the opening at the bottom end of the discharge voltage test stand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210751795.4A CN115236362A (en) | 2022-06-28 | 2022-06-28 | Voltage test fixture is dropped under cracked atmospheric pressure of prevention insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210751795.4A CN115236362A (en) | 2022-06-28 | 2022-06-28 | Voltage test fixture is dropped under cracked atmospheric pressure of prevention insulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115236362A true CN115236362A (en) | 2022-10-25 |
Family
ID=83670919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210751795.4A Pending CN115236362A (en) | 2022-06-28 | 2022-06-28 | Voltage test fixture is dropped under cracked atmospheric pressure of prevention insulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115236362A (en) |
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2022
- 2022-06-28 CN CN202210751795.4A patent/CN115236362A/en active Pending
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