Double-layered thin-walled simulated leak detection member having end-face rib plate seal welding and d-shaped and preparation method

Abstract

The present disclosure disclose a leak-testing mock-up for sealing weld of an end-face stiffener with a double-layer thin-walled D-shaped cross-section and a manufacturing method. A first simulated inner shell is vertically welded with a first simulated end-face stiffener by means of a first weld seam, a first simulated outer shell is vertically welded with the first simulated end-face stiffener by means of a second weld seam, and are welded into a “Π-shaped” structure. A second simulated inner shell is vertically welded with a second simulated end-face stiffener by means of the first weld seam, a second simulated outer shell is vertically welded with the second simulated end-face stiffener by means of the second weld seam, and are welded into a “Π-shaped” structure. Two back-to-back “Π-shaped” structures are tightly abutted to form an “H-shaped” structure, where the two intimately mated lateral surfaces of the “H-shaped” structure are welded through sequentially“Π-shaped” “H-shaped” “H-shaped” by means of third and fourth weld seams. The two tightly abutted end faces of the “H-shaped” structure are joined “H-shaped” by means of a fifth weld seam. An end face of the “H-shaped” structure away from the fourth weld seam is connected to an inlet pipe connected with a helium mass spectrometer leak detector.

Description

Double-layer thin-wall D-section end rib plate sealing simulation leak detection part and preparation method Technical Field

[0001] The invention belongs to the technical field of vacuum equipment manufacturing, and in particular relates to a double-layer thin-wall D-section end rib plate sealing and welding simulation leak detection part and a preparation method thereof. Background Art

[0002] A tokamak is a doughnut-shaped container that uses magnetic confinement to achieve controlled nuclear fusion. Its name derives from the words "toroidal," "kamera," "magnet," and "kotushka." A tokamak consists of a doughnut-shaped vacuum chamber at its center, surrounded by coils. When powered, a massive spiral magnetic field is generated within the tokamak, heating the plasma to extremely high temperatures and achieving nuclear fusion.

[0003] The Tokamak-2M is the largest and most advanced tokamak device currently in existence, representing a new generation of advanced magnetic confinement nuclear fusion experimental research equipment. As one of the three main components of a tokamak, the vacuum chamber is crucial for providing a stable reaction space for the ultra-high temperature plasma.

[0004] The mainframe vacuum chamber, one of the three mainframe components of the Circulator II M device, features a D-shaped, double-layered, thin-walled, fully welded ring structure. Its inner ring has a diameter of 2 meters, its outer ring has a diameter of 5.22 meters, and its height is 3.02 meters. It primarily consists of an inner shell, an outer shell, stiffening ribs, and various window openings. The entire vacuum chamber is welded together from 20 fan-shaped segments, each with an 18° center angle. The mainframe vacuum chamber structure is shown in Figure 18.

[0005] Each segment is welded together into a D-shaped, interlayered component consisting of an inner shell, an outer shell, and two end panels. Several locations, as indicated by the cloud lines in Figure 18, require welding to the window. Therefore, the end panels at these locations must be cut, leaving no connection between adjacent end panels at the cutouts. As shown in Figure 19, welding to the window creates a cavity that cannot guarantee vacuum and leak rate requirements. However, as a vacuum chamber operates in high-temperature plasma, it has very strict requirements for vacuum and leak rate within the vacuum chamber. To ensure that the vacuum and leak rate within the mainframe vacuum chamber meet these requirements, the cutouts of the end panels must be sealed as shown in Figure 20 before being welded to the window. Consequently, multiple welds converge at this location: the shell-to-end panel weld, the seal weld at the cutouts, and the welds between the end panels, inner shell, and window. To verify that the overlapping welds do not compromise weld integrity, simulation testing is necessary. This is done by welding a simulated test piece and then performing a helium leak test. However, the prior art does not disclose a device that uses a welding simulation test piece to perform welding simulation and performs helium leak detection on the welding simulation test piece. Therefore, the research and development of this technology has great market prospects.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a double-layer thin-wall D-section end rib plate sealing and welding simulation leak detection part and a preparation method thereof.

[0008] The invention mainly solves the design and manufacture of a test piece for verifying the density of the sealing weld at the cut-off position of the end face reinforcement plate between adjacent sector sections of a double-layer thin-wall D-section host vacuum chamber and a helium leak detection device.

[0009] In order to solve the technical problem, the technical solution of the present invention is: a double-layer thin-walled D-section end rib plate sealing simulation leak detection part, including a first simulated inner shell, a second simulated inner shell, a first simulated outer shell, a second simulated outer shell, a first simulated end rib plate, a second simulated end rib plate and an intake pipe, the first simulated inner shell is vertically welded to the first simulated end rib plate through a first weld, the first simulated outer shell is vertically welded to the first simulated end rib plate through a second weld, the first simulated inner shell, the first simulated outer shell and the first simulated end rib plate are welded into a "Π" shape structure, the second simulated inner shell The first weld is used to vertically weld the second simulated end face rib plate, the second simulated outer shell is used to vertically weld the second simulated end face rib plate through the second weld, the second simulated inner shell, the second simulated outer shell and the second simulated end face rib plate are welded into a "Π"-shaped structure, and the two "Π"-shaped structures are tightly pressed back to back to form an "H"-shaped structure, and the two tightly pressed side surfaces of the "H"-shaped structure are welded by the third weld and the fourth weld connected in sequence, and the two tightly pressed end surfaces of the "H"-shaped structure are welded by the fifth weld, and the end face of the "H"-shaped structure away from the fourth weld is connected to the air inlet pipe, and the air inlet pipe is connected to the helium mass spectrometer leak detector.

[0010] Preferably, it also includes a flange simulation part, and one end face of the "H"-shaped structure close to the fourth weld is welded to the flange simulation part, wherein the first simulated inner shell and the second simulated inner shell are welded to the flange simulation part through the sixth weld, the first simulated outer shell and the second simulated outer shell are welded to the flange simulation part through the seventh weld, and the first simulated end face rib plate and the second simulated end face rib plate are welded to the flange simulation part through the eighth weld.

[0011] Preferably, the first simulated inner shell, the second simulated inner shell, the first simulated outer shell, the second simulated outer shell, the first simulated end face ribs and the second simulated end face ribs are all square plates.

[0012] Preferably, the thickness and width dimensions of the first simulated inner shell, the second simulated inner shell, the first simulated outer shell, the second simulated outer shell, the first simulated end face rib plate, and the second simulated end face rib plate are respectively consistent with the thickness and width dimensions of the simulated product at that location, and the height of the flange simulation part is consistent with the height of the window of the simulated product.

[0013] Preferably, a method for preparing a double-layer thin-walled D-shaped cross-section end face rib plate sealing and welding simulated leak detection part, preparing the above-mentioned double-layer thin-walled D-shaped cross-section end face rib plate sealing and welding simulated leak detection part, comprises the following steps:

[0014] Step 1: Determine the thickness and width of the first simulated inner shell, the second simulated inner shell, the first simulated outer shell, the second simulated outer shell, the first simulated end face ribs, and the second simulated end face ribs, so that they are consistent with the thickness and width of the simulated product at that location. The height of the flange simulation is consistent with the height of the window of the simulated product.

[0015] Step 2: Process the first grooves of the first simulated inner shell, the second simulated inner shell, the first simulated outer shell, and the second simulated outer shell. The first grooves are consistent with the grooves of the simulated product.

[0016] Step 3: Assemble and weld the first simulated inner shell, the second simulated inner shell, the first simulated outer shell, the second simulated outer shell, the first simulated end face ribs, and the second simulated end face ribs to form two "Π"-shaped structures, where the two "Π"-shaped structures represent adjacent sectors;

[0017] Step 4: Process the grooves at the end face ribs of the two "Π"-shaped structures, process the two ends of the end face ribs of the "Π"-shaped structure into the second grooves, and process the middle positions of the two sides of the end face ribs of the "Π"-shaped structure into the third grooves. The second grooves are processed according to the groove form and size of the connecting welds between adjacent fan-shaped segments of the simulated product, and the third grooves are processed according to the groove form and size of the sealing welds of the end face ribs at the cut-off between adjacent fan-shaped segments of the simulated product;

[0018] Step 5: Weld the two "Π"-shaped structures back to back to form an "H"-shaped structure;

[0019] Step 6: Cut the "H"-shaped structure into two "H"-shaped simulated leak detection initial parts along the center, process the fourth groove on the cut surface and weld them to form the fifth weld;

[0020] Step 7: Seal weld the entire unwelded portion of the end ribs of one of the H-shaped simulated leak detection initial parts, and connect the end of the H-shaped simulated leak detection initial part away from the fourth weld to the intake pipe to form a first simulated leak detection part;

[0021] Step 8: Process a fifth groove on one end face of another "H"-shaped simulated leak detection initial component close to the fourth weld. The fifth groove is consistent with the groove at the connection window of the simulated product.

[0022] Step 9: Weld another "H"-shaped simulated leak detection initial part to the flange simulation part at the fifth groove, and seal the entire unwelded part of the end face rib of the "H"-shaped simulated leak detection initial part. At the same time, connect the end face of the "H"-shaped simulated leak detection initial part away from the fourth weld to the intake pipe to form a second simulated leak detection part.

[0023] Preferably, step 3 is specifically as follows: vertically welding the first groove of the first simulated inner shell and the first simulated end face rib plate to form a first weld, vertically welding the first groove of the first simulated outer shell and the first simulated end face rib plate to form a second weld, the first simulated inner shell, the first simulated outer shell and the first simulated end face rib plate are welded into a "Π"-shaped structure in cross section, vertically welding the first groove of the second simulated inner shell and the second simulated end face rib plate to form a first weld, vertically welding the first groove of the second simulated outer shell and the second simulated end face rib plate to form a second weld, and the second simulated inner shell, the second simulated outer shell and the second simulated end face rib plate are welded into a "Π"-shaped structure in cross section.

[0024] Preferably, step 5 is specifically as follows: welding to form a third weld in a triangular weld groove formed by the two second grooves, and then welding to form a fourth weld in a "U"-shaped weld groove formed by the two third grooves, so that the two "Π"-shaped structures are welded back to back to form an "H"-shaped structure.

[0025] Preferably, the step 7 of connecting the air intake pipe is as follows: a φ12.5 helium leak detection hole with a depth of 10 mm is opened on the end face of the "H" type simulated leak detection initial component away from the fourth weld, and a φ12 air intake pipe for helium leak detection is welded at the same time.

[0026] Preferably, after completing step 7, all the components of the first simulated leak detection part except the air inlet pipe are wrapped in a helium cover, and the air inlet pipe is connected to the helium mass spectrometer leak detector. The interlayer of the first simulated leak detection part is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, and the output indication of the instrument is observed to determine the leakage rate of the first simulated leak detection part. The detection of the first simulated leak detection part is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.

[0027] Preferably, after completing step 9: all the components of the second simulated leak detection part except the air inlet pipe are wrapped in a helium cover, connected to the helium mass spectrometer leak detector through the air inlet pipe, the interlayer of the second simulated leak detection part is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, the output indication of the instrument is observed, the leakage rate of the second simulated leak detection part is determined, and the detection of the second simulated leak detection part is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] (1) The present invention discloses a double-layer thin-wall D-shaped cross-section end face rib plate sealing and welding simulation leak detection part, the simulation leak detection part comprises a first simulation inner shell, a second simulation inner shell, a first simulation outer shell, a second simulation outer shell, a first simulation end face rib plate, a second simulation end face rib plate and an air intake pipe, the thickness and width of the first simulation inner shell, the second simulation inner shell, the first simulation outer shell, the second simulation outer shell, the first simulation end face rib plate and the second simulation end face rib plate are consistent with the thickness and width of the simulated product at that location, and a helium mass spectrometer leak detector is connected through the air intake pipe to evacuate the interlayer of the simulation leak detection part to realize helium leak detection, thereby performing a simulation test on the double-layer thin-wall D-shaped cross-section end face rib plate sealing and welding;

[0030] (2) The simulated leak detection part of the present invention intercepts the key positions of the simulated product. To ensure that the simulated leak detection part is representative, the simulated part is designed to use the same thickness and material as the components of the simulated product, and is welded using the same welding structure and welding process as the product;

[0031] (3) The present invention uses a special helium leak detection device to perform vacuum helium leak detection on the sealed space of the simulated component in accordance with the product technical requirements. The test results show that the density of the weld at the sealing weld can obtain a vacuum degree and leakage rate that meet the technical requirements, proving the welding reliability of the sealing weld;

[0032] (4) During the helium leak detection process of the simulated leak detection part of the present invention, the first simulated leak detection part is first subjected to a helium leak detection to detect whether the density of the end face rib plate sealing weld is good, and then the second simulated leak detection part is subjected to a helium leak detection to detect whether the density of the end face rib plate and the flange simulation part sealing weld is good, which can better guide the welding process of the simulated product;

[0033] (5) For ultra-high vacuum equipment that must be welded in a cross-overlapping manner due to equipment structural limitations, when it is ultimately impossible to directly perform helium leak detection on the welds to be covered, the present invention studies a simulated leak detection part. By only making a simulated part, the reliability of the structural weld is verified, reducing the risk of rework or even scrapping of later products due to unreasonable weld structure design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic structural diagram of a double-layer thin-wall D-section end rib welded simulated leak detection component according to the present invention;

[0035] FIG2 is a schematic structural diagram of a double-layer thin-wall D-section end rib welded simulated leak detection component according to the present invention;

[0036] FIG3 is a schematic structural diagram of a second simulated inner shell in Example 7 of the present invention;

[0037] FIG4 is a schematic structural diagram of a “Π”-shaped structure in Example 7 of the present invention;

[0038] FIG5 is a schematic structural diagram of a “Π”-shaped groove processing structure in Example 7 of the present invention;

[0039] FIG6 is a cross-sectional view taken along the line AA of FIG5 of the present invention;

[0040] FIG7 is a cross-sectional view taken along line BB of FIG5 of the present invention;

[0041] FIG8 is a schematic cross-sectional view of an “H”-shaped structure in Example 7 of the present invention;

[0042] Figure 9 is a schematic cross-sectional view of an "H"-shaped structure in Example 7 of the present invention;

[0043] FIG10 is a schematic diagram of the segmentation structure of the “H” type structure in Example 7 of the present invention;

[0044] FIG11 is a cross-sectional view taken along line CC of FIG10 of the present invention;

[0045] FIG12 is a schematic diagram of the structure of the “H” type structure after segmentation and welding in Example 7 of the present invention;

[0046] Figure 13 is a schematic structural diagram of an H-shaped structure processing groove in Example 7 of the present invention;

[0047] FIG14 is a cross-sectional view taken along the line DD of FIG13 of the present invention;

[0048] FIG15 is a cross-sectional view taken along line EE of FIG13 of the present invention;

[0049] FIG16 is a schematic cross-sectional view of a second simulated leak detection component in Example 7 of the present invention;

[0050] FIG17 is a schematic cross-sectional view of a second simulated leak detection component in Example 7 of the present invention;

[0051] Figure 18 is a schematic diagram of the structure of a conventional host vacuum chamber;

[0052] Figure 19 is a partial cross-sectional view of the existing host vacuum chamber structure at the cloud line mark;

[0053] Figure 20 is a schematic diagram of the structure of the existing host vacuum chamber structure at the cut-off point marked by the cloud line.

[0054] Explanation of the accompanying drawings: 1. First simulated inner shell plate, 2. Second simulated inner shell, 3. First simulated outer shell, 4. Second simulated outer shell, 5. First simulated end rib plate, 6. Second simulated end rib plate, 7. Inlet pipe, 8. First weld, 9. Second weld, 10. Third weld, 11. Fourth weld, 12. Fifth weld, 13. Flange simulation part, 14. Sixth weld, 15. Seventh weld, 16. Eighth weld, 17. First groove, 18. Second groove, 19. Third groove, 20. Fourth groove, 21. Fifth groove, 22. End rib plate, 23. Inner shell, 24. Outer shell, 25. Weld between inner shell and end rib plate, 26. Weld between outer shell and end rib plate, 27. Connecting weld between end rib plates, 28. Sealing welds on both sides of the cut between the end rib plates. DETAILED DESCRIPTION

[0055] The specific implementation of the present invention is described below in conjunction with examples:

[0056] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0057] Since the equipment is too large to conduct a 1:1 simulation test, we can only use the simulated product local structure to make a simulation part with the same welding structure as the product part and the same welding process. After welding, a vacuum helium leak test is performed to verify the reliability of the welding structure. However, since the simulation part is a local structure, the same leak detection device as the product cannot be used to detect the vacuum degree and leak rate. Therefore, it is necessary to design and manufacture a special simulation part leak detection device.

[0058] The first simulated inner shell 1 and the second simulated inner shell 2 correspond to the inner shell 23;

[0059] The first simulated housing 3 and the second simulated housing 4 correspond to the housing 24;

[0060] The first simulated end rib plate 5 and the second simulated end rib plate 6 correspond to the end rib plate 22;

[0061] The first weld 8 corresponds to the weld 25 between the inner shell and the end rib plate;

[0062] The second weld 9 corresponds to the weld 26 between the shell and the end rib plate;

[0063] The third weld 10 corresponds to the connecting weld 27 between the end ribs;

[0064] The fourth weld 11 corresponds to the sealing welds 28 on both sides of the cut between the end face ribs;

[0065] The fourth groove 20 corresponds to the end face sealing groove where the end face ribs are cut;

[0066] The fifth weld 12 corresponds to the end face sealing weld at the cut between the end face ribs.

[0067] Example 1

[0068] As shown in Figure 1, the present invention discloses a double-layer thin-wall D-section end face rib plate sealing simulation leak detection part, including a first simulated inner shell 1, a second simulated inner shell 2, a first simulated outer shell 3, a second simulated outer shell 4, a first simulated end face rib plate 5, a second simulated end face rib plate 6 and an intake pipe 7. The first simulated inner shell 1 is vertically welded to the first simulated end face rib plate 5 through a first weld 8, and the first simulated outer shell 3 is vertically welded to the first simulated end face rib plate 5 through a second weld 9. The first simulated inner shell 1, the first simulated outer shell 3 and the first simulated end face rib plate 5 are welded into a "Π"-shaped structure. The second simulated inner shell 2 is vertically welded to the first simulated end face rib plate 5 through a first weld 8. The weld 8 is vertically welded to the second simulated end face rib plate 6, and the second simulated outer shell 4 is vertically welded to the second simulated end face rib plate 6 through the second weld 9. The second simulated inner shell 2, the second simulated outer shell 4 and the second simulated end face rib plate 6 are welded into a "Π"-shaped structure. The two "Π"-shaped structures are tightly pressed back to back to form an "H"-shaped structure. The two tightly pressed side surfaces of the "H"-shaped structure are welded by the third weld 10 and the fourth weld 11 connected in sequence. The two end surfaces of the "H"-shaped structure are welded by the fifth weld 12. The end face of the "H"-shaped structure away from the fourth weld 11 is connected to the air inlet pipe 7, and the air inlet pipe 7 is connected to the helium mass spectrometer leak detector.

[0069] Example 2

[0070] As shown in Figure 2, preferably, it also includes a flange simulation part 13, and one end face of the "H"-shaped structure close to the fourth weld 11 is welded to the flange simulation part 13, wherein the first simulated inner shell 1 and the second simulated inner shell 2 are welded to the flange simulation part 13 through the sixth weld 14, the first simulated outer shell 3 and the second simulated outer shell 4 are welded to the flange simulation part 13 through the seventh weld 15, and the first simulated end face rib plate 5 and the second simulated end face rib plate 6 are welded to the flange simulation part 13 through the eighth weld 16.

[0071] Example 3

[0072] As shown in FIG1 , preferably, the first simulated inner shell 1 , the second simulated inner shell 2 , the first simulated outer shell 3 , the second simulated outer shell 4 , the first simulated end face ribs 5 and the second simulated end face ribs 6 are all square plates.

[0073] As shown in Figure 1, preferably, the thickness and width dimensions of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end face rib plate 5, and the second simulated end face rib plate 6 are respectively consistent with the thickness and width dimensions of the simulated product at that location, and the height of the flange simulation part 13 is consistent with the height of the window of the simulated product.

[0074] Example 4

[0075] As shown in Figures 1 and 2, preferably, a method for preparing a double-layer thin-walled D-shaped cross-section end rib plate sealing and welding simulated leak detection part, preparing the above-mentioned double-layer thin-walled D-shaped cross-section end rib plate sealing and welding simulated leak detection part, includes the following steps:

[0076] Step 1: Determine the thickness and width of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end face rib plate 5, and the second simulated end face rib plate 6, so that they are consistent with the thickness and width of the simulated product at that location. The height of the flange simulation part 13 is consistent with the height of the window of the simulated product.

[0077] Step 2: Processing the first groove 17 of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, and the second simulated outer shell 4. The first groove 17 is consistent with the groove of the simulated product at that location;

[0078] Step 3: Assemble and weld the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end face rib plate 5, and the second simulated end face rib plate 6 respectively to form two "Π"-shaped structures, where the two "Π"-shaped structures represent adjacent sectors;

[0079] Step 4: Process the grooves at the end face ribs of the two "Π"-shaped structures, process the two ends of the end face ribs of the "Π"-shaped structure into second grooves 18, and process the middle positions of the two sides of the end face ribs of the "Π"-shaped structure into third grooves 19. The second grooves 18 are processed according to the groove form and size of the connecting welds between adjacent fan-shaped segments of the simulated product, and the third grooves 19 are processed according to the groove form and size of the sealing welds of the end face ribs at the cut-off between adjacent fan-shaped segments of the simulated product;

[0080] Step 5: Weld the two "Π"-shaped structures back to back to form an "H"-shaped structure;

[0081] Step 6: Cut the “H”-shaped structure into two “H”-shaped simulated leak detection initial pieces along the center, process the fourth groove 20 on the cut surface and weld them to form the fifth weld 12;

[0082] Step 7: The entire unwelded portion of the end face ribs of one of the H-shaped simulated leak detection initial parts is sealed and welded, and the end face of the H-shaped simulated leak detection initial part away from the fourth weld 11 is connected to the intake pipe 7 to form a first simulated leak detection part;

[0083] Step 8: Process a fifth groove 21 on one end face of another "H"-shaped simulated leak detection initial component close to the fourth weld 11. The fifth groove 21 is consistent with the groove at the connection window of the simulated product.

[0084] Step 9: Weld another "H"-shaped simulated leak detection initial part to the flange simulation part 13 at the fifth groove 21, and seal the entire unwelded part of the end face rib of the "H"-shaped simulated leak detection initial part. At the same time, connect the end face of the "H"-shaped simulated leak detection initial part away from the fourth weld 11 to the intake pipe 7 to form a second simulated leak detection part.

[0085] Example 5

[0086] Preferably, the step 3 is specifically as follows: the first groove 17 of the first simulated inner shell 1 is vertically welded to the first simulated end face rib plate 5 to form a first weld 8, the first groove 17 of the first simulated outer shell 3 is vertically welded to the first simulated end face rib plate 5 to form a second weld 9, the first simulated inner shell 1, the first simulated outer shell 3 and the first simulated end face rib plate 5 are welded into a "Π"-shaped structure in cross section, the first groove 17 of the second simulated inner shell 2 is vertically welded to the second simulated end face rib plate 6 to form a first weld 8, the first groove 17 of the second simulated outer shell 4 is vertically welded to the second simulated end face rib plate 6 to form a second weld 9, the second simulated inner shell 2, the second simulated outer shell 4 and the second simulated end face rib plate 6 are welded into a "Π"-shaped structure in cross section.

[0087] Preferably, step 5 is specifically as follows: welding the third weld 10 in a triangular weld groove formed by the two second grooves 18, and then welding the fourth weld 11 in a "U"-shaped weld groove formed by the two third grooves 19, so that the two "Π"-shaped structures are welded back to back to form an "H"-shaped structure.

[0088] Preferably, the step 7 of connecting the air intake pipe 7 is as follows: a φ12.5 helium leak detection hole with a depth of 10 mm is opened on the end face of the "H" type simulated leak detection initial component away from the fourth weld 11, and the φ12 air intake pipe 7 for helium leak detection is welded at the same time.

[0089] Example 6

[0090] Preferably, after completing step 7, all the components of the first simulated leak detection part except the air inlet pipe 7 are wrapped in a helium cover, and the air inlet pipe 7 is connected to the helium mass spectrometer leak detector. The interlayer of the first simulated leak detection part is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, and the output indication of the instrument is observed to determine the leakage rate of the first simulated leak detection part. The detection of the first simulated leak detection part is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.

[0091] Preferably, after completing step 9: all the components of the second simulated leak detection part except the air inlet pipe 7 are wrapped in a helium cover, connected to the helium mass spectrometer leak detector through the air inlet pipe 7, the interlayer of the second simulated leak detection part is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, the output indication of the instrument is observed, the leakage rate of the second simulated leak detection part is determined, and the detection of the second simulated leak detection part is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.

[0092] Example 7

[0093] The preparation method of a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part of the present invention is implemented as follows:

[0094] 1) Determine the thickness and width of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end face rib plate 5, and the second simulated end face rib plate 6 so that they are consistent with the thickness and width of the simulated product at that location. The height of the flange simulation part 13 is consistent with the height of the window of the simulated product.

[0095] 2) Process the first groove 17 of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, and the second simulated outer shell 4 as shown in FIG3 . The first groove 17 is consistent with the groove of the simulated product. A total of 4 pieces, 2 inner shells and 2 outer shells;

[0096] 3) As shown in Figure 4, the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end face rib plate 5 and the second simulated end face rib plate 6 are respectively assembled and welded to form two "Π"-shaped structures. The two "Π"-shaped structures represent adjacent fan-shaped segments, and a total of two specimens represent adjacent fan-shaped segments.

[0097] 4) Process the grooves at the end face reinforcement plates of the two "Π"-shaped structures as shown in Figures 5 to 7, and process the two ends of the end face reinforcement plates on both sides of the "Π"-shaped structure into the second groove 18, and the middle position of the two sides of the end face reinforcement plates of the "Π"-shaped structure into the third groove 19. The second groove 18 is processed according to the groove form and size of the connecting weld between adjacent sector segments of the simulated product, and the third groove 19 is processed according to the groove form and size of the sealing weld of the end face reinforcement plates at the cut between adjacent sector segments of the simulated product. There are 2 pieces in total, AA is processed according to the groove form and size of the connecting weld between adjacent sector segments of the product, and BB is processed according to the groove form and size of the sealing weld of the end face reinforcement plates at the cut between adjacent sector segments of the product.

[0098] 5) As shown in Figures 8 and 9, two "Π"-shaped structures are welded back to back to form an "H"-shaped structure, which respectively represent the welds of the end ribs between adjacent sector segments.

[0099] 6) Cut the H-shaped structure of the test piece into two "H"-shaped simulated leak detection initial pieces along the center CC as shown in Figures 10 to 12, process the fourth groove 20 on the cut surface and weld to form the fifth weld 12, and divide it into two symmetrical test pieces along the center, and then process the welding groove of the end face sealing welding at the cut end face rib plate and weld them.

[0100] 7) The entire unwelded portion of the end face ribs of one of the "H" type simulated leak detection initial parts is sealed and welded, and the end face of the "H" type simulated leak detection initial part away from the fourth weld 11 is connected to the intake pipe 7 to form a first simulated leak detection part. According to Figure 1, a φ12.5 helium leak detection hole with a depth of 10 mm is drilled on the side of the end face ribs away from the fourth weld 11. At the same time, a φ12 helium leak detection intake pipe 7 is welded. After the helium leak detection device is welded, a helium mass spectrometer is used to perform vacuum helium leak detection on the interlayer cavity formed by the sealing weld of the end face ribs. The leakage rate is ≤1×10 -9 Pa·m 3 / s, the end face rib sealing weld has good density, and the vacuum degree and leakage rate meet the technical requirements.

[0101] 8) As shown in Figures 13 to 15, a fifth groove 21 is processed on one end face of another "H"-shaped simulated leak detection initial part near the fourth weld 11. The fifth groove 21 is consistent with the groove at the connection window of the simulated product. The groove size of the end face rib plate welded to the inner and outer shells and the window is consistent with that of the product.

[0102] 9) As shown in Figures 16 and 17, another "H"-shaped simulated leak detection initial part is welded to the flange simulation part 13 at the fifth groove 21, and the entire unwelded part of the end face rib of the "H"-shaped simulated leak detection initial part where it is connected is sealed and welded. At the same time, the end face of the "H"-shaped simulated leak detection initial part away from the fourth weld 11 is connected to the air intake pipe 7 to form a second simulated leak detection part, as shown in Figure 2. The welding represents the welds between the flange simulation part and the inner and outer shells and the window.

[0103] 10) As shown in FIG2 , all components of the second simulated leak detection component except the air inlet pipe 7 are wrapped in a helium cover, and the second simulated leak detection component is connected to the helium mass spectrometer leak detector through the air inlet pipe 7. The interlayer of the second simulated leak detection component is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, and the output indication of the instrument is observed to determine the leakage rate of the second simulated leak detection component. The detection of the second simulated leak detection component is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good, and the vacuum degree and leakage rate meet the technical requirements.

[0104] The working principle of the present invention is as follows:

[0105] As shown in Figures 1 and 2, the present invention discloses a double-layer thin-walled D-section end rib plate sealing simulation leak detection part, including a first simulated inner shell 1, a second simulated inner shell 2, a first simulated outer shell 3, a second simulated outer shell 4, a first simulated end rib plate 5, a second simulated end rib plate 6 and an intake pipe 7, and a flange simulation part 13. The thickness and width dimensions of the first simulated inner shell 1, the second simulated inner shell 2, the first simulated outer shell 3, the second simulated outer shell 4, the first simulated end rib plate 5, and the second simulated end rib plate 6 are consistent with the thickness and width dimensions of the simulated product at that location. The height of the flange simulation part 13 is consistent with the height of the window of the simulated product. A first simulated leak detection part and a second simulated leak detection part are made. The first simulated leak detection part is used to perform vacuum helium leak detection on the interlayer cavity formed by the sealing weld of the end rib plate, and the second simulated leak detection part is used to perform vacuum helium leak detection on the interlayer cavity formed by the end rib plate, the shell and the flange again. The production of the simulation part verifies the reliability of the structural weld and reduces the risk of rework or even scrapping of later products due to unreasonable weld structure design.

[0106] Because the structure of the host vacuum chamber equipment itself can be sealed to realize the vacuum helium leak detection of the equipment itself, the test piece is to verify whether the early structural design and groove design can meet the requirements of the vacuum helium leak detection of the equipment. It is not operational to conduct a simulation test on the test piece according to the 1:1 size of the equipment. Therefore, the test piece adopts a partially open structure and the welding form has been determined. The difficulty lies in how to realize the helium leak detection of the test piece. It cannot be detected according to the conventional helium leak detection method. The structure of the test piece is analyzed. The present invention adopts the method of sealing welding between the various components of the simulated leak detection piece, and wraps all the components of the test piece except the exhaust pipe in a helium cover. The exhaust pipe is connected to the helium mass spectrometer leak detector to vacuum the interlayer of the test piece, and then the leak detection valve of the instrument is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, and the output indication of the instrument is observed to determine the leakage rate of the test piece.

[0107] The present invention discloses a double-layer thin-wall D-shaped cross-section end face rib plate sealing and welding simulation leak detection part, the simulation leak detection part comprises a first simulation inner shell, a second simulation inner shell, a first simulation outer shell, a second simulation outer shell, a first simulation end face rib plate, a second simulation end face rib plate and an air intake pipe, the thickness and width dimensions of the first simulation inner shell, the second simulation inner shell, the first simulation outer shell, the second simulation outer shell, the first simulation end face rib plate and the second simulation end face rib plate are consistent with the thickness and width dimensions of the simulated product at that location, and a helium mass spectrometer leak detector is connected through the air intake pipe, and the interlayer of the simulation leak detection part is vacuumed to realize helium leak detection, thereby performing simulated detection on the sealing and welding of the end face rib plate of the double-layer thin-wall D-shaped cross-section.

[0108] The simulated leak detection part of the present invention captures the key positions of the simulated product. To ensure that the simulated leak detection part is representative, the simulated part is designed to use materials with the same thickness and material as the components of the simulated product, and is welded using the same welding structure and welding process as the product.

[0109] The present invention uses a special helium leak detection device to perform vacuum helium leak detection on the sealed space of the simulated component in accordance with the product technical requirements. The test results show that the density of the weld at the sealing point can obtain the vacuum degree and leakage rate that meet the technical requirements, proving the welding reliability of the sealing.

[0110] During the helium leak detection process of the simulated leak detection part of the present invention, the first simulated leak detection part is first subjected to a helium leak detection to detect whether the density of the sealing weld of the end face rib plate is good, and then the second simulated leak detection part is subjected to a helium leak detection to detect whether the density of the sealing weld between the end face rib plate and the flange simulation part is good, which can better guide the welding process of the simulated product.

[0111] For ultra-high vacuum equipment that must be welded using a cross-overlapping method due to equipment structural limitations, when it is ultimately impossible to directly perform helium leak detection on the welds to be covered, the present invention studies a simulated leak detection part. By only producing a simulated part, the reliability of the structural welds is verified, reducing the risk of rework or even scrapping of later products due to unreasonable weld structure design.

[0112] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the scope of the present invention.

[0113] Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part, characterized by: The invention comprises a first simulated inner shell (1), a second simulated inner shell (2), a first simulated outer shell (3), a second simulated outer shell (4), a first simulated end face rib plate (5), a second simulated end face rib plate (6) and an air intake pipe (7); the first simulated inner shell (1) is vertically welded to the first simulated end face rib plate (5) through a first weld seam (8); the first simulated outer shell (3) is vertically welded to the first simulated end face rib plate (5) through a second weld seam (9); the first simulated inner shell (1), the first simulated outer shell (3) and the first simulated end face rib plate (5) are welded into a "Π"-shaped structure; the second simulated inner shell (2) is vertically welded to the second simulated end face rib plate through a first weld seam (8) and a second simulated end face rib plate (6) vertical welding, the second simulated outer shell (4) is vertically welded to the second simulated end face rib plate (6) through the second weld (9), the second simulated inner shell (2), the second simulated outer shell (4) and the second simulated end face rib plate (6) are welded into a "Π"-shaped structure, the two "Π"-shaped structures are closely attached back to back to form an "H"-shaped structure, the two closely attached side surfaces of the "H"-shaped structure are welded through the third weld (10) and the fourth weld (11) connected in sequence, the two closely attached end surfaces of the "H"-shaped structure are welded through the fifth weld (12), the end surface of the "H"-shaped structure away from the fourth weld (11) is connected to the air inlet pipe (7), and the air inlet pipe (7) is connected to the helium mass spectrometer leak detector.

2. The double-layer thin-wall D-section end rib welded simulated leak detection part according to claim 1, characterized in that: The invention also includes a flange simulation part (13), wherein an end face of the "H"-shaped structure close to the fourth weld (11) is welded to the flange simulation part (13), wherein the first simulated inner shell (1) and the second simulated inner shell (2) are welded to the flange simulation part (13) through a sixth weld (14), the first simulated outer shell (3) and the second simulated outer shell (4) are welded to the flange simulation part (13) through a seventh weld (15), and the first simulated end face rib plate (5) and the second simulated end face rib plate (6) are welded to the flange simulation part (13) through an eighth weld (16).

3. The double-layer thin-wall D-section end rib welded simulated leak detection part according to claim 2, characterized in that: The first simulated inner shell (1), the second simulated inner shell (2), the first simulated outer shell (3), the second simulated outer shell (4), the first simulated end face rib plate (5), and the second simulated end face rib plate (6) are all square plates.

4. The double-layer thin-wall D-section end rib welded simulated leak detection component according to claim 3, characterized in that: The thickness and width of the first simulated inner shell (1), the second simulated inner shell (2), the first simulated outer shell (3), the second simulated outer shell (4), the first simulated end face rib plate (5), and the second simulated end face rib plate (6) are respectively consistent with the thickness and width of the simulated product at that location, and the height of the flange simulation part (13) is consistent with the height of the window of the simulated product.

5. A method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part, characterized in that: The preparation of the double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to any one of claims 1 to 4 comprises the following steps: Step 1: Determine the thickness and width of the first simulated inner shell (1), the second simulated inner shell (2), the first simulated outer shell (3), the second simulated outer shell (4), the first simulated end face rib plate (5), and the second simulated end face rib plate (6), so that they are consistent with the thickness and width of the simulated product at that location, and the height of the flange simulation part (13) is consistent with the height of the window of the simulated product; Step 2: Processing the first groove (17) of the first simulated inner shell (1), the second simulated inner shell (2), the first simulated outer shell (3), and the second simulated outer shell (4), wherein the first groove (17) is consistent with the groove of the simulated product at that location; Step 3: The first simulated inner shell (1), the second simulated inner shell (2), the first simulated outer shell (3), the second simulated outer shell (4), the first simulated end face rib plate (5) and the second simulated end face rib plate (6) are respectively assembled and welded to form two "Π"-shaped structures, wherein the two "Π"-shaped structures represent adjacent sector segments; Step 4: Process the grooves at the end face ribs of the two "Π"-shaped structures, process the two ends of the end face ribs of the "Π"-shaped structure into the second groove (18), and process the middle position of the two sides of the end face ribs of the "Π"-shaped structure into the third groove (19). The second groove (18) is processed according to the groove form and size of the connecting weld between adjacent fan-shaped segments of the simulated product, and the third groove (19) is processed according to the groove form and size of the sealing weld of the end face ribs at the cut between adjacent fan-shaped segments of the simulated product; Step 5: Weld the two "Π"-shaped structures back to back to form an "H"-shaped structure; Step 6: Cut the "H"-shaped structure into two "H"-shaped simulated leak detection initial pieces along the center, process the fourth groove (20) on the cut surface and weld them to form a fifth weld (12); Step 7: The entire unwelded portion of the end face ribs of one of the "H"-shaped simulated leak detection initial parts is sealed and welded, and the end face of the "H"-shaped simulated leak detection initial part away from the fourth weld (11) is connected to the air intake pipe (7) to form a first simulated leak detection part; Step 8: Process a fifth groove (21) on one end face of another "H"-shaped simulated leak detection initial component close to the fourth weld (11), and the fifth groove (21) is consistent with the groove at the connection window of the simulated product; Step 9: Weld another "H"-shaped simulated leak detection initial part to the flange simulation part (13) at the fifth groove (21), and seal the entire unwelded portion of the end face rib of the "H"-shaped simulated leak detection initial part. At the same time, the end face of the "H"-shaped simulated leak detection initial part away from the fourth weld (11) is connected to the intake pipe (7) to form a second simulated leak detection part.

6. The method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to claim 5, characterized in that: The step 3 specifically comprises: vertically welding the first groove (17) of the first simulated inner shell (1) and the first simulated end face rib plate (5) to form a first weld (8), vertically welding the first groove (17) of the first simulated outer shell (3) and the first simulated end face rib plate (5) to form a second weld (9), welding the first simulated inner shell (1), the first simulated outer shell (3) and the first simulated end face rib plate (5) into a structure with a "Π" cross section, vertically welding the first groove (17) of the second simulated inner shell (2) and the second simulated end face rib plate (6) to form a first weld (8), vertically welding the first groove (17) of the second simulated outer shell (4) and the second simulated end face rib plate (6) to form a second weld (9), and welding the second simulated inner shell (2), the second simulated outer shell (4) and the second simulated end face rib plate (6) into a structure with a "Π" cross section.

7. The method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to claim 5, characterized in that: The step 5 specifically comprises: welding in a triangular welding groove formed by two second grooves (18) to form a third weld (10), and then welding in a "U"-shaped welding groove formed by two third grooves (19) to form a fourth weld (11), so that the two "Π"-shaped structures are welded back to back to form an "H"-shaped structure.

8. The method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to claim 5, characterized in that: The specific steps of connecting the air inlet pipe (7) in step 7 are as follows: opening an end surface of the "H" type simulated leak detection initial part away from the fourth weld (11) Helium leak detection is carried out in holes with a depth of 10 mm and welded at the same time Inlet pipe (7) for helium leak detection.

9. The method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to claim 5, characterized in that: After completing step 7, all the components of the first simulated leak detection part except the air inlet pipe (7) are wrapped in a helium cover, and the part is connected to the helium mass spectrometer leak detector through the air inlet pipe (7). The interlayer of the first simulated leak detection part is evacuated, and then the leak detection valve of the helium mass spectrometer leak detection is opened. After the instrument reaches the working pressure, the instrument is put into the leak detection working state, and the output indication of the instrument is observed to determine the leakage rate of the first simulated leak detection part. The detection of the first simulated leak detection part is completed. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.

10. The method for preparing a double-layer thin-wall D-section end rib plate sealing and welding simulated leak detection part according to claim 5, characterized in that: After completing step 9: wrap all the components of the second simulated leak detection part except the air inlet pipe (7) in a helium cover, connect it to the helium mass spectrometer leak detector through the air inlet pipe (7), evacuate the interlayer of the second simulated leak detection part, and then open the leak detection valve of the helium mass spectrometer leak detection. After the instrument reaches the working pressure, put the instrument into the leak detection working state, observe the instrument output indication, determine the leakage rate of the second simulated leak detection part, and complete the detection of the second simulated leak detection part. When the leakage rate is ≤1×10 -9 Pa·m 3 / s, the weld density is good.