WO2017022603A1 - ダイアフラムダンパ - Google Patents
ダイアフラムダンパ Download PDFInfo
- Publication number
- WO2017022603A1 WO2017022603A1 PCT/JP2016/072113 JP2016072113W WO2017022603A1 WO 2017022603 A1 WO2017022603 A1 WO 2017022603A1 JP 2016072113 W JP2016072113 W JP 2016072113W WO 2017022603 A1 WO2017022603 A1 WO 2017022603A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer peripheral
- peripheral end
- cover member
- diaphragms
- tip
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/28—Seam welding of curved planar seams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0041—Means for damping pressure pulsations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
- F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
- F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
- F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/02—Diaphragms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/05—Buffers therefor
- F16L55/052—Pneumatic reservoirs
- F16L55/053—Pneumatic reservoirs the gas in the reservoir being separated from the fluid in the pipe
- F16L55/054—Pneumatic reservoirs the gas in the reservoir being separated from the fluid in the pipe the reservoir being placed in or around the pipe from which it is separated by a sleeve-shaped membrane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
Definitions
- the present invention relates to a diaphragm damper for absorbing pulsation used in places where pulsation occurs, such as a high-pressure fuel pump.
- a damper device provided in a fluid passage of a high-pressure fuel pump
- a damper device absorbs the pulsation of the fuel pressure discharged from the high pressure fuel pump.
- the pulsation width of the fuel pressure is reduced, and the fuel injection amount is stabilized.
- the damper device includes a first diaphragm 50, a second diaphragm 55, a first support member 60 that supports the first diaphragm 50 from below, and a second diaphragm. And a second support member 65 that supports 55 from above.
- the first diaphragm 50 is made of a metal thin plate, has a peripheral edge portion 51, and a central portion 52 that is recessed downward with respect to the peripheral edge portion 51, and is formed in a dish shape.
- the second diaphragm 55 is also made of a thin metal plate, and has a peripheral portion 56 and a central portion 57 that is recessed upward with respect to the peripheral portion 56 and is formed in a dish shape.
- the peripheral portion 51 of the first diaphragm 50 and the peripheral portion 56 of the second diaphragm 55 are overlapped with each other.
- the peripheral edge portion 51 and the peripheral edge portion 56 are sandwiched from above and below by the first sandwiching portion 61 of the first support member 60 and the second sandwiching portion 66 of the second support member 65.
- the thickness of the 1st clamping part 61 and the 2nd clamping part 66 is larger than the thickness of the peripheral part 51 and the peripheral part 56, and has fixed length irrespective of the position of radial direction.
- the peripheral edge portion 51 of the first diaphragm 50, the peripheral edge portion 56 of the second diaphragm 55, the first sandwiching portion 61, and the second sandwiching portion 66 are joined over the entire periphery of the peripheral portion and the sandwiching portion by laser welding. Specifically, as shown in FIG. 4B, the four members of the peripheral portion 51 of the first diaphragm 50, the peripheral portion 56 of the second diaphragm 55, the first sandwiching portion 61, and the second sandwiching portion 66 are formed. In a superposed state, the laser beam 70 is irradiated in a direction orthogonal to these end faces.
- the peripheral edge portions 51 and 56 and the first and second sandwiching portions 61 and 66 are sealed and joined by performing heli welding continuously over the entire circumference.
- the diameter d of the end surface of the welding region 71 is set such that the peripheral edge portion 51 of the first diaphragm 50, the peripheral edge portion 56 of the second diaphragm 55, the first clamping portion 61 and the first sandwiching portion 61. 2
- the thickness of each end face of the sandwiching portion 66 is smaller than the total thickness t.
- the diameter of the welding region 71 decreases from the end surface of the welding region 71 toward the back. For this reason, the welding region 71 is not exposed on either surface of the first clamping unit 61 and the second clamping unit 66.
- the degree of penetration it is impossible to confirm the degree of welding progressed from the end face of the welding region 71 to the back, that is, the degree of penetration. If the end surface of the welding region 71 is small, the depth distance of the welding region 71 is not necessarily small. Conversely, if the end surface of the welding region 71 is large, the depth distance of the welding region 71 is not necessarily large. For this reason, there is a possibility that welding is insufficient or excessive, a welding result as designed cannot be obtained, and the original performance of the damper device is not sufficiently exhibited. Moreover, in the conventional welding method, since the heat input amount is increased or decreased through experience, it has been difficult to make the penetration amount constant.
- An object of the present invention is to provide a diaphragm damper capable of confirming the amount of penetration of a welded portion by observation from the outer surface and controlling the amount of penetration of a welded portion within a certain range.
- a diaphragm damper having a pair of diaphragms and a high-pressure chamber configured of a pair of diaphragms and filled with high-pressure gas
- the pair of diaphragms The peripheral edge portion of the outer periphery of the diaphragm damper forms the outer peripheral end of the diaphragm damper, and the entire outer periphery of the outer peripheral end is continuously sealed and joined by laser welding. It is set so as to correspond to the spot diameter of light, and a weld bead is formed in the entire region of the tip of the outer peripheral end by welding.
- This feature makes it possible to estimate the amount of penetration from the outer diameter and width of the weld bead after welding. Moreover, the balance between the heat input when the tip of the outer peripheral end starts to melt and the heat radiation by metal heat transfer becomes good. For this reason, the penetration depth is stable, and the amount of penetration can be kept constant over the entire circumference of the outer peripheral end portion. Furthermore, even if the center of the laser beam is deviated from the thickness center of the outer peripheral end, the weld bead is formed over the entire area of the outer peripheral end. Therefore, there is no influence due to the deviation of the center of the laser beam from the thickness center of the outer peripheral end, and the amount of penetration can be kept constant. Furthermore, even when undulation is generated at the outer peripheral end, the amount of penetration can be kept constant.
- the diaphragm damper further includes a first cover member and a second cover member that support each of the pair of diaphragms, and the first and second cover members have peripheral edges of the pair of diaphragms.
- Each of the sandwiching portions has a sandwiching portion, and each sandwiching portion of the first cover member and each sandwiching portion of the second cover member each have an outer surface having a slope, and each sandwiching portion is directed toward the tip of each sandwiching portion. It is preferable that each thickness is set to be small.
- the pair of diaphragms are respectively covered from the outside by the first cover member and the second cover member, and the peripheral portions of the pair of diaphragms are overlapped with each other, and the overlapped peripheral portions are the first cover.
- the outer peripheral end portion includes the peripheral edge portions of the pair of diaphragms and the respective sandwiching portions of the first cover member and the second cover member.
- the pair of diaphragms, the first cover part, and the second cover part can be reliably integrated from the outer diameter and width of the weld bead.
- FIG. 1 is a longitudinal sectional view showing a diaphragm damper according to Embodiment 1 of the present invention.
- (A) is a partial cross-sectional view showing an enlarged outer peripheral end of the diaphragm damper
- (b) is a partial cross-sectional view showing a welding state when the irradiation position of the laser beam is deviated from the center xx.
- the fragmentary sectional view which shows the state after the welding of the outer peripheral edge part of a diaphragm damper.
- (A) is a longitudinal cross-sectional view which shows the conventional diaphragm damper
- (b) is a fragmentary sectional view which shows the welding state of a diaphragm damper.
- the diaphragm damper according to the first embodiment of the present invention is used in a high-pressure pump that pressurizes fuel supplied from a fuel tank by a reciprocating movement of a plunger and pumps the fuel to an injector.
- a fuel chamber is formed near the fuel inlet of this type of high-pressure pump.
- a “suction process” in which fuel is sucked from the fuel chamber into the pressurizing chamber when the plunger is lowered, and a “control” in which a part of the fuel in the pressurizing chamber is returned to the fuel chamber when the plunger is raised.
- the “quantity step” and the “pressurization step” in which the fuel is pressurized when the plunger further moves up after closing the intake valve are repeated. Accordingly, the high pressure pump pressurizes the fuel and discharges the pressurized fuel.
- the diaphragm damper according to the present invention is used to reduce pulsation generated in the fuel chamber of such a high-pressure pump.
- the housing 1 of the high-pressure pump includes a fuel chamber 2 that can accommodate fuel supplied from the outside.
- the fuel chamber 2 is formed by an upper portion 3 of the housing 1 and an inner surface of a bottomed cylindrical cover 4 which is fixed on the upper portion of the housing 1.
- the lower part of the cover 4 is closely joined to the housing 1.
- two diaphragm dampers 10 are installed in the fuel chamber 2.
- the two diaphragm dampers 10 are arranged in the vertical direction.
- the basic structure of the upper diaphragm damper 10 is the same as that of the lower diaphragm damper 10.
- the two diaphragm dampers 10 are fixed to each other by a clip 11.
- the diaphragm damper 10 is placed on the upper part 3 of the housing 1.
- a holding member 13 is provided inside the cover 4.
- the coiled wave spring 12 is fixed above the diaphragm damper 10 via a holding member 13.
- the flam damper 10 is fixed to the housing 1 by being pressed downward by a coiled wave spring 12.
- the diaphragm damper 10 has a pair of disk-shaped diaphragms 15 and 15.
- the diaphragm damper 10 includes a pair of diaphragms 15 and 15 and a high pressure chamber 16 in which high pressure gas is enclosed.
- the pair of disk-shaped diaphragms 15, 15 are covered from the outside by disk-shaped first cover member 17 and second cover member 18, respectively.
- a pair of rubber-like elastic members 14, 14 are arranged in the vertical direction.
- the pair of diaphragms 15 and 15 are made of a flexible thin metal plate and are formed in the same shape.
- the diaphragms 15 and 15 are formed so that the central portions 15b and 15b have flexibility.
- the first cover member 17 and the second cover member 18 are made of metal, support the diaphragms 15 and 15, respectively, and have a larger thickness than the diaphragms 15 and 15.
- peripheral portions 15a and 15a of the diaphragms 15 and 15 are overlapped with each other.
- the overlapped peripheral portions 15 a and 15 a are sandwiched between a peripheral portion of the first cover member 17 and a peripheral portion of the second cover member 18.
- peripheral portions 15a and 15a of the diaphragms 15 and 15, the sandwiching portion 17a of the first cover member 17 and the sandwiching portion 18a of the second cover member form an outer peripheral end A of the diaphragm damper 10 in an overlapped state.
- the outer peripheral end A is continuously sealed and joined by laser welding over the entire circumference of the outer peripheral end A.
- the first cover member 17 is held by the first jig 19, and the second cover member 18 is held by the second jig 20. Further, by bringing the first jig 19 and the second jig 20 close to each other, the peripheral portions 15 a and 15 a of the diaphragms 15 and 15, the holding portion 17 a of the first cover member 17, and the holding portion 18 a of the second cover member 18 are , Maintained in close contact with each other.
- the laser welding for example, seam welding using a YAG laser is used.
- the pair of diaphragms 15 and 15, the first cover member 17 and the second cover member 18 held by the first jig 19 and the second jig 20 are rotated around the vertical axis in FIG.
- the laser beam L is emitted from the peripheral units 15a and 15a of the pair of diaphragms 15 and 15, the clamping part 17a of the first cover member 17, and the clamping part 18a of the second cover member 18 from the emission unit 21 of the laser device.
- the outer peripheral end A is irradiated in a direction orthogonal to the rotation axis.
- the entire circumference of the outer peripheral end A is welded.
- the weld bead 22 is formed over the entire circumference of the outer peripheral end A, and the high-pressure chamber 16 is sealed.
- the thickness t of the tip of the outer peripheral end A is set so as to correspond to the spot diameter d of the laser light L at the tip of the outer peripheral end A.
- the spot diameter d means the diameter of a region where the laser condensing system is melted by heat by irradiation with the laser light L.
- the spot diameter d is larger than the light collection size at the processing point.
- the thickness t of the tip of the outer peripheral end A is larger than the spot diameter d of the laser light L at the tip of the outer peripheral end A.
- the sandwiching portion 17a of the first cover member 17 and the sandwiching portion 18a of the second cover member each have outer surfaces having gradients 17b and 18b.
- the gradients 17b and 18b are set so that the thickness of each clamping part becomes smaller toward the respective tips of the clamping part 17a and the clamping part 18a.
- the gradients 17b and 18b are set so that the thickness t of the tip of the outer peripheral end A and the spot diameter d of the laser beam L are substantially the same.
- the relationship between the spot diameter d of the laser beam L and the thickness t of the tip of the outer peripheral end A is such that the spot diameter d> the thickness t. It only has to satisfy the formula. However, the thickness t at the front end of the outer peripheral end A cannot be excessively reduced due to a demand for strength.
- the spot diameter d of the laser beam L is determined by welding conditions such as the material of the laser device and the member to be welded.
- the outer peripheral end A has some undulation due to manufacturing errors and the like. Taking this undulation into consideration, the spot diameter d of the laser beam L is preferably set slightly larger than the thickness t of the tip of the outer peripheral end A.
- the thickness t of the tip of the outer peripheral end A and the spot diameter d of the laser beam L are set to be substantially the same, the balance between heat input when the tip of the outer peripheral end A starts to melt and heat dissipation due to metal heat transfer. Will be better. For this reason, the penetration depth h is stabilized, and the amount of penetration is kept constant over the entire circumference of the outer peripheral end A.
- the entire front end of the outer peripheral end A becomes a melting region.
- a weld bead 22 is formed in the entire region of the tip of the outer peripheral end A.
- the amount of penetration can be estimated from the outer diameter D and the width B of the weld bead 22 after welding.
- the sandwiching portion 17a of the first cover member 17 and the sandwiching portion 18a of the second cover member each have outer surfaces having gradients 17b and 18b.
- the gradients 17b and 18b are respectively set so that the thickness of each clamping part becomes smaller toward the respective tips of the clamping part 17a and the clamping part 18a. For this reason, energy by heat input gradually diffuses from the front end of the outer peripheral end A to the back, and the entire thickness direction of the welded region of the outer peripheral end A can be made a melting region. Therefore, the melted area can be confirmed from the outer surface of the outer peripheral end A.
- the center of the laser beam is shifted downward from the center xx of the thickness t at the tip of the outer peripheral end A.
- the lower end of the weld bead 22 is limited by the lower end of the outer peripheral end A even if the center of the laser beam is shifted downward from the center xx. It is. Therefore, the weld bead 22 does not increase beyond the lower end of the outer peripheral end A.
- the upper end of the weld bead is formed up to the upper end of the outer peripheral end A.
- the weld bead 22 is formed in the entire region of the tip of the outer peripheral end A. Therefore, there is no influence due to the deviation of the center of the laser beam from the center xx of the thickness t at the tip of the outer peripheral end A. Therefore, the amount of penetration can be kept constant.
- the penetration amount may change in the conventional welding method.
- the penetration amount can be kept constant.
- Example 1 has the following remarkable effects.
- the thickness t of the tip of the outer peripheral end A is set so as to correspond to the spot diameter d of the laser light L. According to this configuration, since the weld bead 22 is formed in the entire region of the tip of the outer peripheral end A after welding, it is possible to estimate the amount of penetration from the outer diameter D and the width B of the weld bead after welding. Become.
- the thickness t of the tip of the outer peripheral end A is set to be substantially the same as the spot diameter d of the laser beam L. According to this structure, the balance between the heat input when the tip of the outer peripheral end A starts to melt and the heat radiation by the metal heat transfer becomes good. For this reason, the penetration depth h is stabilized, and the amount of penetration is kept constant over the entire circumference of the outer peripheral end A.
- the sandwiching portion 17a of the first cover member 17 and the sandwiching portion 18a of the second cover member have outer surfaces having gradients 17b and 18b, respectively.
- the gradients 17b and 18b are set so that the thickness of each clamping part becomes smaller toward the respective tips of the clamping part 17a and the clamping part 18a. For this reason, energy by heat input gradually diffuses from the front end of the outer peripheral end A to the back, and the entire thickness direction of the welded region of the outer peripheral end A can be made a melting region. Therefore, the melted area can be confirmed from the outer surface of the outer peripheral end A.
- the weld bead 22 can be connected to the tip of the outer peripheral end A even if the center of the laser beam deviates from the center xx of the thickness t of the tip of the outer peripheral end A. It is formed in the whole area. Therefore, there is no influence due to the deviation of the center of the laser beam from the center xx of the thickness t at the tip of the outer peripheral end A. Therefore, the amount of penetration can be kept constant.
- the slopes 17b and 18b of the sandwiching portion 17a of the first cover member 17 and the sandwiching portion 18a of the second cover member are such that the thickness of each sandwiching portion 17a and 18a increases toward the tip of each sandwiching portion 17a and 18a.
- the thickness t of the tip of the outer peripheral end A is “substantially the same” as the spot diameter d of the laser beam L, or the spot diameter d of the laser beam L is “slightly less than the thickness t of the tip of the outer peripheral end A”. "Large” is used. In short, the thickness t of the tip of the outer peripheral end A is set to correspond to the spot diameter d of the laser beam L so that the weld bead 22 is formed in the entire region of the tip of the outer peripheral end A after welding. That's fine.
- outer periphery edge part L ... laser beam, t ... thickness of the front-end
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Fuel-Injection Apparatus (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
例えば、レーザ光の中心が、外周端部Aの先端の厚みtの中心x-xよりも下方にずれた場合を想定する。本発明によれば、外周端部Aの先端の容積が小さいため、レーザ光の中心が中心x-xよりも下方にずれても、溶接ビード22の下端は、外周端部Aの下端が限界である。よって、溶接ビード22は、外周端部Aの下端を越えて大きくはならない。一方、溶接ビードの上端は、外周端部Aの上端まで形成される。このため、結局、溶接ビード22は、外周端部Aの先端の全域に形成される。よって、レーザ光の中心が外周端部Aの先端の厚みtの中心x-xからずれたことによる影響はない。よって、溶け込み量を一定に維持することができる。
(1)外周端部Aの先端の厚みtは、レーザ光Lのスポット径dと対応するように設定されている。この構成によれば、溶接後の外周端部Aの先端の全域に溶接ビード22が形成されるため、溶接後の溶接ビードの外径D及び幅Bから、溶け込み量を推定することが可能となる。
前記実施例では、第1カバー部材17の挟持部17a及び第2カバー部材の挟持部18aの勾配17b,18bは、各挟持部17a,18aの先端に向かうに従い各挟持部17a,18aの厚みが小さくなるように直線的に変化していたが、外側に凸又は内側に凹となるように曲線的に変化してもよい。
Claims (3)
- 一対のダイアフラムと、前記一対のダイアフラムから構成されると共に高圧ガスが封入される高圧室とを有するダイアフラムダンパにおいて、
前記一対のダイアフラムの周縁部は、前記ダイアフラムダンパの外周端部を形成し、前記外周端部の全周は、レーザ溶接により連続的に密封及び接合され、
前記外周端部の先端の厚みは、前記外周端部の先端におけるレーザ光のスポット径に対応するように設定され、
溶接により、前記外周端部の先端の全域に溶接ビードが形成される、ダイアフラムダンパ。 - 前記ダイアフラムダンパは、更に、前記一対のダイアフラムのそれぞれを支持する第1カバー部材と第2カバー部材とを有し、
前記第1及び第2カバー部材は、前記一対のダイアフラムの周縁部を挟持する挟持部をそれぞれ有し、
前記第1カバー部材の挟持部及び前記第2カバー部材の挟持部は、勾配を有する外面をそれぞれ有し、前記各勾配は、前記各挟持部の先端に向かうに従い前記各挟持部の厚みが小さくなるように、それぞれ設定されている、請求項1記載のダイアフラムダンパ。 - 前記一対のダイアフラムは、前記第1カバー部材及び前記第2カバー部材により外側からそれぞれ覆われ、前記一対のダイアフラムの周縁部は、相互に重ね合わされ、前記重ね合わされた周縁部は、前記第1カバー部材及び前記第2カバー部材の各挟持部により挟持され、
前記外周端部は、前記一対のダイアフラムの周縁部と、前記第1カバー部材及び前記第2カバー部材の各挟持部とを含む、請求項1に記載のダイアフラムダンパ。
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CN201680036051.7A CN107709820B (zh) | 2015-07-31 | 2016-07-28 | 膜片阻尼器 |
US15/747,462 US10495042B2 (en) | 2015-07-31 | 2016-07-28 | Diaphragm damper |
EP16832882.1A EP3330564B1 (en) | 2015-07-31 | 2016-07-28 | Diaphragm damper |
JP2017532534A JP6676054B2 (ja) | 2015-07-31 | 2016-07-28 | ダイアフラムダンパ |
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EP3330564B1 (en) | 2020-03-25 |
US20180209389A1 (en) | 2018-07-26 |
CN107709820A (zh) | 2018-02-16 |
JPWO2017022603A1 (ja) | 2018-05-31 |
JP6676054B2 (ja) | 2020-04-08 |
CN107709820B (zh) | 2019-08-23 |
EP3330564A4 (en) | 2019-03-13 |
US10495042B2 (en) | 2019-12-03 |
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