WO2017169960A1 - 金属製ダイアフラムダンパ - Google Patents
金属製ダイアフラムダンパ Download PDFInfo
- Publication number
- WO2017169960A1 WO2017169960A1 PCT/JP2017/011139 JP2017011139W WO2017169960A1 WO 2017169960 A1 WO2017169960 A1 WO 2017169960A1 JP 2017011139 W JP2017011139 W JP 2017011139W WO 2017169960 A1 WO2017169960 A1 WO 2017169960A1
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- WIPO (PCT)
- Prior art keywords
- diaphragm
- metal thin
- diaphragms
- diaphragm damper
- thin films
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 67
- 239000002184 metal Substances 0.000 title claims abstract description 67
- 239000010409 thin film Substances 0.000 claims abstract description 54
- 230000010349 pulsation Effects 0.000 abstract description 11
- 238000007789 sealing Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 23
- 239000000446 fuel Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 14
- 239000010408 film Substances 0.000 description 9
- 239000002356 single layer Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
-
- 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
- F16F9/0409—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 characterised by the wall structure
-
- 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
- F16F9/0418—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 having a particular shape, e.g. annular, spherical, tube-like
-
- 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
- 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
-
- 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
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
-
- 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
-
- 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
Definitions
- the present invention relates to a pulsation absorbing diaphragm damper used in a place where pulsation occurs, such as a high-pressure fuel pump, and more particularly to a metallic diaphragm damper.
- a pad that is connected to a water supply device and seals the periphery of a pair of laminate members in which a synthetic resin film is bonded to the inside and outside of an aluminum foil to absorb pressure shock, and contains pressure gas inside is known.
- Prior Art 1 for example, see Patent Document 1
- a diaphragm damper is known in which pressure gas is accommodated in a chamber tightly closed by a pair of metal diaphragms in order to attenuate pressure pulsation in the fluid system (hereinafter referred to as “prior art 2”).
- Prior art 2 for example, see Patent Document 2.
- the above prior art 1 is used for preventing water hammer, and the purpose of the pad is not to contaminate the water of the water supply device and that the pad is not eroded by water.
- Overload prevention means for situations where the pressure fluctuates periodically and the maximum operating pressure rises to about 2 MPa such as a diaphragm damper for absorbing pulsation used in places where pulsation occurs such as the high-pressure fuel pump of the invention
- a diaphragm damper for absorbing pulsation used in places where pulsation occurs
- the laminate member may be damaged, and a problem that the life is short is expected.
- the prior art 2 is for attenuating pressure pulsations in the fuel system of the internal combustion engine.
- the upper diaphragm and the lower diaphragm constituting the damper are each made of one metal. It is formed from a member. Since the pressure resistance and pulsation absorption performance of this damper depend on the thickness, shape, and material of a single metal member, for example, increasing the thickness to increase pressure resistance increases the spring constant and increases the volume variation. As a result of the reduction, there is a problem in that a damper having high pressure resistance and excellent pulsation absorption performance cannot be obtained.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a metal diaphragm damper having an excellent pulsation absorbing performance even when the pressure resistance is improved.
- the diaphragm damper of the present invention is firstly a diaphragm damper in which the outer edges of a pair of diaphragms are joined to each other, and a high-pressure gas is sealed in a space formed inside.
- the pair of diaphragms is formed from a metal thin film, At least one of the pair of diaphragms has a multilayer structure in which a plurality of metal thin films are overlapped and fixed at an outer edge portion thereof.
- the diaphragm damper of the present invention is secondly characterized in that, in the first feature, the plurality of metal thin films are made of the same kind of metal. According to this feature, the welding operation at the outer edge portion is easy and a good welded portion can be obtained.
- the diaphragm damper according to the present invention is characterized in that, in the first or second feature, the plurality of metal thin films have the same thickness. According to this feature, the respective thin films can be similarly heated during welding, and the welding operation can be facilitated.
- the distance between the pair of diaphragms is the center compared to the outer diameter side.
- the part is small. According to this feature, even if a high external pressure acts on the diaphragm damper, it is possible to prevent damage to the outer diameter side shoulder due to stress.
- the present invention has the following excellent effects.
- a diaphragm damper in which outer edges of a pair of diaphragms are joined to each other and a high-pressure gas is sealed in a space formed inside, the pair of diaphragms is formed of a metal thin film, and at least one of the pair of diaphragms is
- the pair of diaphragms is formed of a metal thin film, and at least one of the pair of diaphragms is
- it is significantly larger than that of a single-layer structure.
- the spring constant can be reduced, the volume change amount as the diaphragm damper can be increased, and the damper function can be sufficiently exhibited.
- the respective thin films can be similarly input heat during welding, and the welding operation can be facilitated.
- FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a top view which shows the diaphragm damper which concerns on Example 2 of this invention.
- FIG. 4 is a sectional view taken along line BB in FIG. 3.
- a diaphragm damper according to a first embodiment of the present invention will be described with reference to FIGS.
- the diaphragm damper according to the present invention is used in a high-pressure pump that pressurizes fuel supplied from a fuel tank by reciprocating movement of a plunger and pumps it to the injector side.
- a fuel chamber is formed on the fuel inlet side, and a “suction process” in which fuel is sucked into the pressurizing chamber from the fuel chamber when the plunger is lowered, and fuel in the pressurizing chamber is raised when the plunger is raised.
- the fuel is pressurized and discharged by repeating the “metering process” for returning a part of the fuel to the fuel chamber and the “pressurization process” for pressurizing the fuel when the plunger further rises after closing the intake valve. To do.
- the diaphragm damper according to the present invention is used to reduce pulsation generated in the fuel chamber of such a high-pressure pump.
- FIG. 1 is a plan view of a diaphragm damper according to a first embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a longitudinal section of the diaphragm damper.
- the diaphragm damper 1 mainly includes an upper diaphragm 10 and a lower diaphragm 20, and the pair of diaphragms 10 and 20 are formed so as to be vertically symmetric with respect to the joint surface S, and have outer edges.
- the parts 2 are joined to each other by welding or the like, and a high pressure gas is sealed in a space 3 formed inside.
- the upper diaphragm 10 and the lower diaphragm 20 are each formed from a disk-shaped metal thin film, and at least one of the diaphragms 10 and 20 is overlapped with a plurality of metal thin films, and is welded at the outer edge 2 thereof. It is configured in a multilayer structure fixed by, for example. Examples of the metal used for the thin film include stainless steel. Further, the thickness of the thin film is set in a range of about 0.1 to 0.5 mm, for example, when the outer diameter of the diaphragm is 30 to 50 mm.
- the upper diaphragm 10 has a multilayer structure in which two thin metal films 11 and 12 are overlapped, and is fixed by welding or the like only at the outer edge portion 2.
- the lower diaphragm 20 also has a multilayer structure in which two thin metal films 21 and 22 are overlapped, and is fixed only at the outer edge 2 by welding or the like.
- the two metal thin films 11 and 12 of the upper diaphragm 10 and the two metal thin films 21 and 22 of the lower diaphragm 20 are fixed by welding or the like only at the outer edge 2 and are fixed at portions other than the outer edge. Therefore, the two metal thin films can be moved relative to each other at portions other than the outer edge portion 2.
- the multi-layer metal thin film is not limited to two, but may be three or more. Further, not only the upper diaphragm 10 and the lower diaphragm 20 have a multilayer structure, but either one may have a multilayer structure.
- the two metal thin films 11 and 12 of the upper diaphragm 10 and the two metal thin films 21 and 22 of the lower diaphragm 20 are made of the same kind of metal and have the same thickness. It is.
- the outer metal thin films 11 and 21 are made of a material having a high corrosion resistance, and the thickness of the two metal thin films varies depending on the spring constant of the material. May be formed from different thin films.
- the inventor is that the spring constant is proportional to the cube of the thickness t of the metal thin film, and the pressure resistance is the same if the entire thickness of the diaphragm is the same.
- the thickness of the thin metal film of the single-layer diaphragm is t
- the total thickness of the two thin metal films of the two-layer diaphragm is t (the thickness of the single layer is t / 2).
- the spring constant k 1 of the diaphragm of the one-layer structure of the prior art 2 is k 1 ⁇ t 3
- the spring constant k 2 of the two-layered diaphragm is k 2 ⁇ (t / 2) 3 + (t / 2) 3 .
- the spring constant k 2 of the two-layer structure bellows, one layer 1 ⁇ 4 of the spring constant k 1 of the diaphragm structure can be reduced significantly spring constant. For this reason, the volume variation
- the pressure resistance (stress) has the same pressure resistance regardless of whether it is a single layer or multiple layers as long as the thickness (total thickness in the case of multiple layers) t is the same.
- the two metal thin films 11 and 12 of the upper diaphragm 10 and the two metal thin films 21 and 22 of the lower diaphragm 20 are fixed by welding or the like only at the outer edge portion 2, and at portions other than the outer edge portion. Since it is not fixed, each thin film is deformed in the same manner, and the deformation is not hindered. Further, when the two metal thin films are formed of the same type of metal, the welding operation at the outer edge portion 2 is easy and a good welded portion can be obtained. Further, if the thicknesses of the two metal thin films are the same, heat is similarly applied to the respective thin films during welding, and the welding operation is facilitated.
- the diaphragm damper according to the first embodiment has the following remarkable effects.
- the pair of diaphragms 10 and 20 are formed of a metal thin film,
- At least one of the pair of diaphragms 10 and 20 has a multi-layer structure in which a plurality of metal thin films 11, 12 or 21, 22 are overlapped and fixed at the outer edge portion 2.
- the spring constant can be significantly reduced as compared with the one-layer structure, the volume change amount as the diaphragm damper can be increased, and the damper function can be sufficiently exerted. it can.
- a diaphragm damper according to a second embodiment of the present invention will be described with reference to FIGS.
- the diaphragm damper according to the second embodiment has a cross-sectional shape different from that of the first embodiment, but the other basic configuration is the same as that of the first embodiment, and redundant description is omitted.
- the upper diaphragm 30 has a multilayer structure in which two thin metal films 31 and 32 are overlapped, and is fixed by welding or the like only at the outer edge portion 2.
- the lower diaphragm 40 also has a multi-layer structure in which two metal thin films 41 and 42 are overlapped, and is fixed only at the outer edge 2 by welding or the like.
- the two metal thin films 31 and 32 of the upper diaphragm 30 and the two metal thin films 41 and 42 of the lower diaphragm 40 are fixed only at the outer edge 2 by welding or the like, and fixed at portions other than the outer edge. Therefore, the two metal thin films can be moved relative to each other at portions other than the outer edge portion 2.
- the upper diaphragm 30 and the lower diaphragm 40 are joined so that the central portions 33 and 43 are recessed as compared with the outer diameter side, respectively.
- a cross-sectional shape that is symmetrically formed with respect to the surface S and that has a smaller central portion 33 and 43 than the outer diameter side in the distance between the upper diaphragm 30 and the lower diaphragm 40 also referred to as the width of the diaphragm.
- the feature is that it is set to a so-called dumbbell-shaped cross-sectional shape.
- the upper diaphragm 30 and the lower diaphragm 40 have R-shaped outer shoulder portions 34 and 44, outer shoulder portions 35 and 45 of the central portions 33 and 43, and inner shoulder portions 36 and 46 of the central portion 33, respectively. Is formed.
- B1 / B2 is as follows when no external pressure is applied to the diaphragm damper 1.
- the distance between the diaphragms 30 and 40 in the central portions 33 and 43 is set to about 2 to 5, and B2 is the upper diaphragm 30 in the central portions 33 and 43 and the lower portion in the normal operating range of the diaphragm damper 1.
- the diaphragm 40 is set so as not to contact but to contact at high external pressure.
- the diaphragm damper according to the second embodiment has the following remarkable effects.
- the pair of diaphragms 30 and 400 are formed from a metal thin film,
- the spring constant can be significantly reduced, the volume change amount as the diaphragm damper can be increased, and the damper function can be sufficiently exhibited.
- the welding operation at the outer edge 2 can be facilitated and a good welded portion can be obtained.
- the thicknesses of the two thin metal films By making the thicknesses of the two thin metal films the same, it is possible to heat the respective thin films in the same way during welding, thereby facilitating the welding operation.
- a high external pressure may act on the diaphragm damper 1 because the center portions 33 and 43 are smaller than the outer diameter side in the distance between the pair of diaphragms 30 and 40. Even in this case, it is possible to prevent the outer shoulders 34 and 44 from being damaged by the stress.
- the present invention is not limited to two, but may be three or more, and may be plural.
- both the upper diaphragm and the lower diaphragm have a multilayer structure composed of two metal thin films.
- the present invention is not limited to this, and either one is A multilayer structure may be used.
- the present invention is not limited to this and is vertically asymmetric. May be.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
- Fuel-Injection Apparatus (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
また、流体システム内の圧力脈動を減衰するため、一対の金属製のダイアフラムによって密に閉鎖された室内に圧力ガスを収容してなるダイアフラムダンパが知られている(以下、「従来技術2」という。たとえば、特許文献2参照。)。
前記一対のダイアフラムは金属の薄膜から形成され、
前記一対のダイアフラムの少なくとも一方は、複数枚の金属の薄膜が重ね合わされ、その外縁部において固定されてなる多層構造であることを特徴としている。
この特徴によれば、1層構造のものと同じ耐圧性を有する場合において、1層構造のものに比べて大幅にバネ定数を小さくすることができ、ダイアフラムダンパとしての容積変化量を大きくすることができ、ダンパ機能を十分に発揮することができる。
この特徴によれば、外縁部における溶接作業が容易であると共に良好な溶接部位を得ることができる。
この特徴によれば、溶接の際、それぞれの薄膜に同じように入熱させることができ、溶接作業を容易とすることができる。
この特徴によれば、ダイアフラムダンパに高外圧が作用することがあっても、外径側肩部の応力による破損を防止することができる。
(1)一対のダイアフラムの外縁部が互いに接合され、内部に形成される空間に高圧ガスが封入されてなるダイアフラムダンパにおいて、一対のダイアフラムは金属の薄膜から形成され、一対のダイアフラムの少なくとも一方は、複数枚の金属の薄膜が重ね合わされ、その外縁部において固定されてなる多層構造であることにより、1層構造のものと同じ耐圧性を有する場合において、1層構造のものに比べて大幅にバネ定数を小さくすることができ、ダイアフラムダンパとしての容積変化量を大きくすることができ、ダンパ機能を十分に発揮することができる。
本発明に係るダイアフラムダンパは、燃料タンクから供給される燃料をプランジャの往復動によって加圧してインジェクタ側へ圧送する高圧ポンプに使用されている。
この種の高圧ポンプでは、燃料入口側に燃料チャンバが形成され、プランジャが下降するときに燃料チャンバから加圧室へ燃料を吸入する「吸入工程」、プランジャが上昇するときに加圧室の燃料の一部を燃料チャンバへ戻す「調量工程」、及び、吸入弁を閉じた後プランジャにがさらに上昇するときに燃料を加圧する「加圧工程」を繰り返すことにより、燃料を加圧して吐出する。
説明の都合上、図2紙面上方をダイアフラムダンパの上方、紙面下方をダイアフラムダンパの下方と呼ぶこととする。
図1及び2において、ダイアフラムダンパ1は、主として、上方のダイアフラム10と下方のダイアフラム20からなり、該一対のダイアフラム10、20は接合面Sを基準にして上下対称となるように形成され、外縁部2において互いに溶接等により接合され、内部に形成される空間3に高圧ガスが封入されて構成される。
薄膜に使用される金属としては、例えば、ステンレス鋼等、が挙げられる。
また、薄膜の厚さは、例えば、ダイアフラムの外径が30~50mmの場合、約0.1~0.5mmの範囲に設定される。
上方のダイアフラム10の2枚の金属の薄膜11及び12並びに下方のダイアフラム20の2枚の金属の薄膜21及び22は、外縁部2においてのみ溶接等により固定され、外縁部以外の部分では固定されていないため、外縁部2以外の部分において2枚の金属の薄膜は相互に相対移動が可能である。
なお、多層構造の金属の薄膜は、2枚に限らず、3枚以上でもよく、要は複数枚であればよいことはもちろんである。
また、上方のダイアフラム10及び下方のダイアフラム20のいずれもが多層構造である場合に限らず、いずれか一方が多層構造であってもよい。
なお、外側の金属の薄膜11、21を耐食性の大きい材料から形成したり、また、厚さも材料のバネ定数に応じて変えるなど、2枚の金属の薄膜は、異種の金属、また、厚さの異なる薄膜から形成されてもよい。
従来技術2の1層構造のダイアフラムのバネ定数k1は、k1∝t3 であり、
2層構造のダイアフラムのバネ定数k2は、k2∝(t/2)3 +(t/2)3 である。
このように、2層構造のベローズのバネ定数k2は、1層構造のダイアフラムのバネ定数k1の1/4となり、大幅にバネ定数を小さくすることができる。このため、ダイアフラムダンパとしての容積変化量を大きくすることができ、ダンパ機能を発揮することができる。
一方、耐圧性(応力)は、1層であっても多層であっても、その厚さ(多層の場合は合計の厚さ)tが同じであれば、同じ耐圧性を有する。
また、2枚の金属の薄膜を同種の金属から形成すると、外縁部2における溶接作業が容易であると共に良好な溶接部位を得ることができる。
さらに、2枚の金属の薄膜の厚さを同じにすると、溶接の際、それぞれの薄膜に同じように入熱し、溶接作業が容易となる。
(1)一対のダイアフラム10、11の外縁部2が互いに接合され、内部に形成される空間3に高圧ガスが封入されてなるダイアフラムダンパ1において、
一対のダイアフラム10、20は金属の薄膜から形成され、
一対のダイアフラム10、20の少なくとも一方は、複数枚の金属の薄膜11、12あるいは21、22が重ね合わされ、その外縁部2において固定されてなる多層構造であることにより、1層構造のものと同じ耐圧性を有する場合において、1層構造のものに比べて大幅にバネ定数を小さくすることができ、ダイアフラムダンパとしての容積変化量を大きくすることができ、ダンパ機能を十分に発揮することができる。
(2)2枚の金属の薄膜11、12あるいは21、22を同種の金属から形成することにより、外縁部2における溶接作業が容易であると共に良好な溶接部位を得ることができる。
(3)2枚の金属の薄膜の厚さを同じにすることにより、溶接の際、それぞれの薄膜に同じように入熱させることができ、溶接作業を容易とすることができる。
実施例2に係るダイアフラムダンパは、断面形状が実施例1と相違するが、その他の基本構成は実施例1と同じであり、重複する説明は省略する。
上方のダイアフラム30の2枚の金属の薄膜31及び32並びに下方のダイアフラム40の2枚の金属の薄膜41及び42は、外縁部2においてのみ溶接等により固定され、外縁部以外の部分では固定されていないため、外縁部2以外の部分において2枚の金属の薄膜は相互に相対移動が可能である。
(1)一対のダイアフラム30、40の外縁部2が互いに接合され、内部に形成される空間3に高圧ガスが封入されてなるダイアフラムダンパ1において、
一対のダイアフラム30、400は金属の薄膜から形成され、
一対のダイアフラム30、40の少なくとも一方は、複数枚の金属の薄膜31、32あるいは41、42が重ね合わされ、その外縁部2において固定されてなる多層構造であることにより、同じ耐圧性を有する場合において、大幅にバネ定数を小さくすることができ、ダイアフラムダンパとしての容積変化量を大きくすることができ、ダンパ機能を十分に発揮することができる。
(2)2枚の金属の薄膜31、32あるいは41、42を同種の金属から形成することにより、外縁部2における溶接作業が容易であると共に良好な溶接部位を得ることができる。
(3)2枚の金属の薄膜の厚さを同じにすることにより、溶接の際、それぞれの薄膜に同じように入熱させることができ、溶接作業を容易とすることができる。
(4)ダイアフラムダンパ1の縦断面形状において、一対のダイアフラム30、40のなす間隔が外径側に比べて中央部33、43が小さいことにより、ダイアフラムダンパ1に高外圧が作用することがあっても、外径側肩部34及び44の応力による破損を防止することができる。
2 外縁部
3 内部に形成される空間
10 上方のダイアフラム
11、12 金属の薄膜
20 下方のダイアフラム
21、22 金属の薄膜
30 上方のダイアフラム
31、32 金属の薄膜
33 中央部
34 外径側肩部
35 中央部の外側肩部
36 中央部の内側肩部
40 下方のダイアフラム
41、42 金属の薄膜
43 中央部
44 外径側肩部
45 中央部の外側肩部
46 中央部の内側肩部
S 接合面
B1 外径側ダイアフラムのなす間隔
B2 中央部のダイアフラムのなす間隔
Claims (4)
- 一対のダイアフラムの外縁部が互いに接合され、内部に形成される空間に高圧ガスが封入されてな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は金属の薄膜から形成され、
前記一対のダイアフラムの少なくとも一方は、複数枚の金属の薄膜が重ね合わされ、その外縁部において固定されてなる多層構造であることを特徴とするダイアフラムダンパ。 - 前記複数枚の金属の薄膜は、同種の金属から構成されることを特徴とする請求項1に記載のダイアフラムダンパ。
- 前記複数枚の金属の薄膜は、同一の厚さであることを特徴とする請求項1又は2に記載のダイアフラムダンパ。
- 前記ダイアフラムダンパの縦断面形状において、前記一対のダイアフラムのなす間隔が外径側に比べて中央部が小さいことを特徴とする請求項1ないし請求項3のいずれか1項に記載のダイアフラムダンパ。
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JP2018509078A JPWO2017169960A1 (ja) | 2016-03-28 | 2017-03-21 | 金属製ダイアフラムダンパ |
CN201780020518.3A CN108884937A (zh) | 2016-03-28 | 2017-03-21 | 金属制隔膜阻尼器 |
US16/088,707 US20190107167A1 (en) | 2016-03-28 | 2017-03-21 | Metal diaphragm damper |
EP17774501.5A EP3438510A4 (en) | 2016-03-28 | 2017-03-21 | METAL MEMBRANE SHOCK ABSORBER |
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EP3438510A1 (en) | 2019-02-06 |
CN108884937A (zh) | 2018-11-23 |
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