CN101752141A - A kind of flexion type acceleration switch - Google Patents
A kind of flexion type acceleration switch Download PDFInfo
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- CN101752141A CN101752141A CN200910254426A CN200910254426A CN101752141A CN 101752141 A CN101752141 A CN 101752141A CN 200910254426 A CN200910254426 A CN 200910254426A CN 200910254426 A CN200910254426 A CN 200910254426A CN 101752141 A CN101752141 A CN 101752141A
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- 230000000694 effects Effects 0.000 claims abstract description 9
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- 238000000034 method Methods 0.000 description 8
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- 230000008901 benefit Effects 0.000 description 2
- 230000002153 concerted effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
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- 230000005672 electromagnetic field Effects 0.000 description 1
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- 238000003379 elimination reaction Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to a kind of flexion type acceleration switch, described acceleration switch is provided with one group of inclination brace summer, mass and adjustable height contact assembly in the insulation-encapsulated housing of switch, described inclination brace summer is a double-decker, its two fixed ends is in the both sides of housing, this bilayer inclination brace summer supports mass according to certain angle α, make mass unsettled, have the contact in the bottom of mass in insulation-encapsulated housing inner chamber balance; Described adjustable height contact is installed on the insulation-encapsulated housing under the mass, and keep certain distance between the mass, when bilayer inclination brace summer under the effect of extraneous threshold value inertia force flexing takes place, described mass then moves along extraneous acceleration direction, make between contact on the mass and the adjustable height contact and form Elastic Contact, and rely on flexing elastic force extruding contact to form stable contact.That acceleration switch of the present invention has is simple in structure, adjustable threshold value and the strong characteristics of antijamming capability.
Description
Technical field
The invention belongs to the inertia sensing technical field, relate to a kind of flexion type acceleration switch, be specially adapted to safe automobile air bag, tire inflation pressure determining system, armament systems fuse and product for civilian use device based on bilayer inclination support beam structure.
Background technology
Acceleration switch (being called g switch, inertia switch again) is can the sense accelerations signal, and is controlled by acceleration rate threshold, through many couple of forces cooperation usefulness, carries out the accurate inertia sensing device of switch mechanical action.It combines sensing and execution together, and its constituted mode is simple, and it is little to have a volume, the distinct characteristic that waits in light weight, and high-tech areas such as military at home and abroad armament systems, civilian mechano-electronic and consumer electronics have demand widely.It is contact force that acceleration switch contacts a reliable important criterion, and after contact force was greater than certain critical value, the contact resistance of switch contact can significantly reduce, and satisfies the instructions for use of switch by big electric current.The size of stablizing contact force is by slider material, contact force and way of contact decision.
Acceleration switch is realized circuit turn-on under the effect of threshold acceleration signal, and to satisfy closing period simultaneously, the requirement of anti-external interference and contact contact stabilization.At present seen acceleration switch working method is similar, but then has nothing in common with each other in version and physical drives mode.US-A-6153839 " Micromechanical switching devices " i.e. is " a kind of micro-machinery switch device ", US-A-5927143 " Self-diagnostic accelerometer with symmetric proof-mass and itspreparation " i.e. is " a kind of self diagnosis accelerometer and preparation thereof with symmetry detection mass ", US-A-4855544 " Multiple level miniature electromechanical accelerometer switch " i.e. " multi-layer compact dynamo-electric acceleration switch " and ZL99123606.8 " mini type mechanical acceleration switch " adopts cantilever beam structure and torsionspring structure to come the sense accelerations signal respectively, but because the limitation of its Linear Elastic Structure itself makes this type of switch need external influence power to be kept closed, this has not only increased the energy consumption of switching system, and can cause contact force less than normal, reduce contact reliability.In the mode that patent US-B1-6388359 " Method of Actuating MEMS Switch " has promptly adopted bistable state arc beam structure supports strip inertia mass element to move along long chute in " a kind of driving method of mems switch ", this just makes stuck phenomenon easily takes place when switch moves under vibration interference.Among the ZL0510078288.5 " noncontacting switch ", adopt the permanent magnet motion to cause that change of magnetic field strength makes Hall element conducting and disconnection, but need increase extra electromagnetic shielding measure for fear of the interference of external electromagnetic field.ZL01142036.7 " method for making mercury type micromechanical inertia switch " though in adopted liquid Hg to reduce contact resistance as electric conducting material, need prevent the Hg leakage problem but have.
In sum, though acceleration switch is of a great variety at present, but be difficult to satisfy simultaneously threshold value induction precision, the practical requirements of function such as stable contact maintenance, low contact resistance and anti-electromagnetic interference, thereby limited switching device applying under some special occasions, the vibration that on the road surface of jolting switch is caused as automobile; The strong-electromagnetic field environment that thunderstorm weather produces and the big electric current of igniter etc.
Summary of the invention
The problem to be solved in the present invention is: solve existing acceleration switch device existing deficiency on environment for use and function, a kind of flexion type acceleration switch with accurate acceleration rate threshold sensing capability, big contact force, contact stabilization, anti-vibration interference, anti-electromagnetic interference is provided.That this acceleration switch has is simple in structure, adjustable threshold value, response rapidly with contact specificly reliably, be applicable to the civil and military occasions such as discharge cock on automobile collision preventing air bag, shell and the guide missile fuze.
Technical solution of the present invention is: one group of inclination brace summer, mass and adjustable height contact assembly are set in the insulation-encapsulated housing of the flexion type acceleration switch of counting establishing, described inclination brace summer is a double-decker, its two fixed ends is in the both sides of housing, this bilayer inclination brace summer supports mass according to certain angle α, make mass unsettled, have the contact in the bottom of mass in insulation-encapsulated housing inner chamber balance; Described adjustable height contact is installed on the insulation-encapsulated housing under the mass, and keeps certain distance between the mass, makes switch misoperation can not take place under the effect of extraneous vibration interference signal.When bilayer inclination brace summer under the effect of extraneous threshold value inertia force flexing takes place, described mass then moves along extraneous acceleration direction, make between contact on the mass and the adjustable height contact and form Elastic Contact, and rely on the flexing elastic force to push the contact, form stable contact, two contacts respectively are connected in the control circuit by lead.
Among the present invention, threshold property and bistable state redirect characteristic that the acceleration rate threshold sensing capability of switch and the quick translation function of on off state are showed when mainly utilizing elasticity inclination brace summer under the ambient pressure effect flexing and post-buckling to take place realize.The stable contact in contact is main rely on nonlinear elasticity power after inertia force and the structure generation redirect make a concerted effort guarantee.Whole construction of switch is simple, be easy to design, after as long as given acceleration rate threshold (closed threshold value, disconnection threshold value) and minimum contact force require, just can determine physical dimension, inclination angle and the switch over travel etc. of the inertial mass of acceleration switch, double-deck elastic supporting beams according to the nonlinear mechanics characteristic of inclination support beam structure.
Among the present invention, the restricting relation between construction of switch parameter and the extraneous acceleration is as follows:
I is as ma＜F
Cr, switch keeps off-state;
Ii is as a 〉=a
cThe time, switch closure, and guarantee certain basis pressure, promptly
Iii is when a=0, and switch still can be kept closed;
Iv works as a=a
dThe time, switch disconnects rapidly;
The extraneous acceleration of a in the formula, F
CrBe the flexing critical force, m inertia mass, a
cBe closed acceleration rate threshold, a
dFor disconnecting acceleration rate threshold, F
kBe nonlinear elasticity power, P is a stable contact pressure.
Mass of the present invention can also be designed to not be with fixed contact, simultaneously with the adjustable height contact design for for having two contacts, separate by insulating sleeve between this this two contacts, when switch closure, mass and two contacts are with the conducting of bridging mode.
Switch operation principle of the present invention: when extraneous acceleration signal was lower than the closed threshold value of design, flexing did not take place in double-deck inclination support beam structure, and switch keeps off-state; When extraneous acceleration during more than or equal to acceleration rate threshold, double-deck inclination brace summer is flexing under the effect of threshold value inertia force, and jumps to second stable position rapidly, and switch is stable under the acting in conjunction of inertia force and nonlinear elasticity power contacts circuit turn-on; When extraneous acceleration was lower than acceleration disconnection acceleration rate threshold, switch relied on the post-buckling elastic force that switch is disconnected.
The present invention compared with prior art has following advantage:
[1] the present invention adopts double-deck inclination support beam structure to respond to the inertia threshold force and realize switch state as the switch flexible member for the first time, and the piece of ensuring the quality of products does not twist.The switching threshold characteristic is remarkable, good reproducibility, response rapidly, contact force is big, stable state keeps no power consumption, can the stable equilibrium in two stable position.
[2] the present invention is for relying on the power-actuated mechanical device of extraneous inertia, can effectively resist electromagnetic interference, and the switch impulse stroke is big, various to external world frequency acceleration signals have mechanical recognition function, the elimination High-frequency Interference, improve the action accuracy of switch under various adverse circumstances (electromagnetic interference, thunderstorm and vibration interference etc.), be applicable to multiple civil and military occasion.
[3] the present invention tilt straight beam structure simple, be easy to processing, and switch has volume characteristics little, in light weight and with low cost, is convenient to produce in batches.
[4] switch acceleration rate threshold adjustable is strong, by adjusting structural parameters such as inertial mass, stroke, elastic supporting beams and inclination angle, just can obtain the acceleration rate threshold switch of various different sizes and profile.By adjusting switch over travel (contact height), just can change contact force and contact resistance and response time are adjusted in the air film damping, to reach the requirement of different applicable situations.
Because the present invention has above-mentioned advantage, therefore have application value widely, can be used for the Auxiliary Control Element that the automobile collision preventing air bag detects as impact strength; The senser element of dropproof, the collision protection system of important memory cell, precision machinery; The radome fairing acceleration induction additional device in the control unit that comes off in the rocket launching process, and the fuze mechanism of armament systems such as guided missile etc.
Description of drawings
Fig. 1 is that master of the present invention looks cross-sectional view, also is the preferred embodiments of the present invention one
Fig. 2 is the cross-sectional view of overlooking of the present invention
Fig. 3 is the influence figure of inclination angle to acceleration rate threshold
Fig. 4 is the influence figure of inclined beams length to acceleration rate threshold
Fig. 5 is a flexion type acceleration switch principle schematic of the present invention, wherein Fig. 5 a be the inclination brace summer at the first stable position initial position schematic diagram, the extraneous power F of Fig. 5 b
vDuring greater than the buckling structure critical force, inclination brace summer strain is at the second stable position schematic diagram
Fig. 6 is an elastic support structure non-linear rigidity curve chart
Fig. 7 is the acceleration signal that applies
Fig. 8 a is the acceleration switch response curve
Fig. 8 b is a contact force change curve in the acceleration switch course of action
The master of Fig. 9 a the preferred embodiments of the present invention two looks the cross-section structure signal
Fig. 9 b is that the contact A of Fig. 9 a is to schematic diagram
Embodiment
Embodiment one
Comprise an insulation-encapsulated shell 3 according to Fig. 1 and the represented switch of the present invention of Fig. 2, be connected to by bilayer inclination brace summer 1 and have contact mass 2, insulation-encapsulated shell bottom setting height(from bottom) adjustable contact 6 under mass 2, transfer the height threaded adjusting of contact 6, fixed contact on the mass 2 and adjustable height contact 6 usefulness leads 5 are drawn and are connected in the control circuit, and whole device is installed with bolt 7.
When switch was subjected to acceleration from the contact axis direction, when acceleration signal is lower than preset threshold, switch was failure to actuate; When acceleration signal during more than or equal to threshold value, the mass 2 that has the contact moves along the acceleration direction, and contacts turning circuit with adjustable contact 6 rapidly.The quality of the mass 2 among Fig. 1 can be adjusted: if increase the mass quality, then corresponding extraneous inertia force increases, and the acceleration rate threshold of switch is reduced; If keep inertial mass constant, by adjusting the physical dimension and the inclination angle of inclination brace summer 1, and then may obtain the switch of different acceleration rate threshold; Be that the influence degree to the acceleration switch threshold value is adjusted at inclination brace summer size and inclination angle as shown in Figure 3 and Figure 4.Fig. 3 represents that under the situation that other parameters of structure are determined, caused threshold acceleration excursion was 0.96g～1.41g when the angle of inclination was adjusted between 4 °～6 °.Fig. 4 represents, other parameter constant, and caused threshold acceleration excursion was 3.6g～5.3g when double-deck inclination brace summer length was adjusted between 9mm～11mm.
The principle of switch of the present invention is mainly based on Fig. 5 and represented elastic support structure course of action and power and the change in displacement schematic diagram of Fig. 6.Shown in Fig. 5 a, the inclination angle of inclination support beam structure is α, and length is L, has good switching threshold characteristic, and first stable position of structure is an initial position, and second stable position is a switch closed condition.As extraneous power F
vDuring greater than the buckling structure critical force, structure jumps to second stable state fast, shown in Fig. 5 b; Otherwise, extraneous power F
vDuring less than critical force, structure maintains the original state constant.Structure is consumed energy in state conversion process, and does not need intake just can make the contact keep certain contact pressure in state maintenance process.Fig. 6 represents power and the displacement changing curve of flexible member in jump procedure.The inclination support beam structure is at extraneous critical force F
vThe post-buckling distortion takes place down in effect, the negative stiffness phenomenon appears in structure, and structure moves to rapidly between the unstable equilibrium position and second stable position, and negative value appears in elastic force, can make Stability Analysis of Structures be equilibrated at contact position this moment by the supporting role of adjustable height contact 6, shown in Fig. 5 b.Adjustable height contact 6 is subjected to the squeezing action of brace summer 1 at this moment, and the present invention utilizes this squeezing action to improve the contact contact force, reduces contact resistance.Simultaneously according to the needs of different application occasion, change the height of contact by the screw thread of turn adjustable contact 6, it is changed between the unstable equilibrium position and second stable position, and then change the stroke and the contact pressure size of switch.
The acceleration signal curve that Fig. 7 and Fig. 8 are represented and the response curve of switch.Among Fig. 7, acceleration signal at first reaches threshold value, keeps reducing to zero after a period of time, then becomes oppositely.Fig. 8 a and Fig. 8 b are response curve and contact force change curve under the acceleration signal effect of acceleration switch of the present invention in Fig. 7.Among Fig. 8 a, when acceleration was lower than closed threshold value, promptly inertia force was less than construction of switch flexing critical force, and switch keeps off-state.When acceleration reached closed threshold value, inertia force made construction of switch generation bending deformation, and switch jumps to closure state rapidly, response rapidly, and after closure by inertia force and structural elasticity power make a concerted effort make switch keep stable as contact force to contact.When acceleration disappears (a=0), switch relies on the negative power of the elasticity of structure still can be kept closed, and still can keep certain contact force to make the stable contact of switch.When backward acceleration reaches the disconnection threshold value, contact contact force vanishing, switch disconnects rapidly, and the switching threshold characteristic is remarkable.Effectively utilized the redirect characteristic of two fixed ends inclination support beam structure to promote switching response speed among the present invention.
Embodiment two
Fig. 9 a and Fig. 9 b are embodiments of the invention technical scheme two schematic diagrames, present embodiment adopts a kind of new contact structure form on the basis of embodiment one, contact on the mass 2 is saved, to two contact 6-1 and 6-2 be set on the adjustable height contact 6, separate by insulating sleeve 6-3 between contact 6-1 and the 6-2, when switch closure, circuit turn-on is realized with the conducting of bridging mode in mass 2 and two contacts.
Claims (8)
1. flexion type acceleration switch, it is characterized in that: one group of inclination brace summer (1), mass (2) and adjustable height contact (6) assembly are set in the insulation-encapsulated housing (3) of switch, described inclination brace summer (1) is a double-decker, its two fixed ends is in the both sides of housing, this bilayer inclination brace summer supports mass (2) according to certain angle α, make mass unsettled, have the contact in the bottom of mass (2) in insulation-encapsulated housing (3) inner chamber balance; Described adjustable height contact (6) is installed on the insulation-encapsulated housing (3) under the mass (2), and mass keeps certain distance between (2), when bilayer inclination brace summer (1) under the effect of extraneous threshold value inertia force flexing takes place, described mass (2) then moves along extraneous acceleration direction, make between contact on the mass (2) and adjustable height contact (6) and form Elastic Contact, and rely on the flexing elastic force to push the contact, form stable contact, two contacts respectively are connected in the control circuit by lead (5).
2. flexion type acceleration switch according to claim 1, it is characterized in that: described inclination brace summer (1) has the high resiliency assembly, the position that structural parameters by adjusting the inclination brace summer and inclination alpha are adjusted flexing critical force and mass (2), and then realize adjusting the acceleration rate threshold and the stroke of switch.
3. flexion type acceleration switch according to claim 1 is characterized in that: described mass (2) adopts demountable structure, adjusts the acceleration rate threshold of switch by the quality of adjusting mass.
4. according to the flexion type acceleration switch of claim 1 or 2 or 3, it is characterized in that the restricting relation between construction of switch parameter and the extraneous acceleration is as follows:
I is as ma＜F
Cr, switch keeps off-state;
Ii is as a 〉=a
cThe time, switch closure, and guarantee certain basis pressure, promptly
Iii is when a=0, and switch still can be kept closed;
Iv works as a=a
dThe time, switch disconnects rapidly;
The extraneous acceleration of a in the formula, F
CrBe the flexing critical force, m inertia mass, a
cBe closed acceleration rate threshold, a
dFor disconnecting acceleration rate threshold, F
kBe nonlinear elasticity power, P is a stable contact pressure.
5. flexion type acceleration switch according to claim 1, it is characterized in that: described adjustable height contact (6) adopts sped structure to be installed on insulation-encapsulated housing (3) bottom, after switch overall structure parameter is determined, adjust contact height by adjusting spiral, make the switch contact good.
6. according to the described flexion type acceleration switch of claim 1, it is characterized in that: described inclination brace summer (1), mass (2) and adjustable height (6) contact are electric conducting material, constitute the current path between inclination brace summer, mass and the adjustable height contact when switch closure.
7. flexion type acceleration switch according to claim 1 is characterized in that: fill viscosity fluid damping material in insulation-encapsulated housing (3), be used for the response speed of Adjustment System.
8. flexion type acceleration switch according to claim 1, it is characterized in that: described mass (2) is contact-carrying not, described adjustable height contact (6) is provided with two contacts (6-1) and (6-2), contact (6-1) and (6-2) between separate by insulating sleeve (6-3), when switch closure, mass (2) and two contacts are with the conducting of bridging mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910254426A CN101752141A (en) | 2009-12-21 | 2009-12-21 | A kind of flexion type acceleration switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910254426A CN101752141A (en) | 2009-12-21 | 2009-12-21 | A kind of flexion type acceleration switch |
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| Publication Number | Publication Date |
|---|---|
| CN101752141A true CN101752141A (en) | 2010-06-23 |
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| CN200910254426A Pending CN101752141A (en) | 2009-12-21 | 2009-12-21 | A kind of flexion type acceleration switch |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157298A (en) * | 2011-03-22 | 2011-08-17 | 西安电子科技大学 | Permanent magnetic collision sensor |
| CN102163514A (en) * | 2011-04-08 | 2011-08-24 | 赵剑 | Permanent magnet type universal collision sensor |
| CN102568923A (en) * | 2011-12-31 | 2012-07-11 | 大连理工大学 | Dual-threshold three-stable-state collision sensor |
| CN103196549A (en) * | 2013-04-08 | 2013-07-10 | 重庆绿色智能技术研究院 | Vibration monitoring system and power management method thereof |
| CN104143473A (en) * | 2013-05-06 | 2014-11-12 | 重庆绿色智能技术研究院 | Acceleration switch and control method of acceleration switch |
| EP2682975A3 (en) * | 2012-07-04 | 2015-04-01 | WB Electronics S.A. | Electric current inertial switch |
| WO2018059050A1 (en) * | 2016-09-30 | 2018-04-05 | 广东美的环境电器制造有限公司 | Fan and switch on/off control method and apparatus thereof |
| CN108240415A (en) * | 2017-12-04 | 2018-07-03 | 上海交通大学 | The big load high damping concretes of compound buckled beam/plate negative stiffness dynamic vibration absorber |
| CN109103049A (en) * | 2018-09-13 | 2018-12-28 | 中国工程物理研究院电子工程研究所 | A kind of MEMS inertia switch based on V-type beam bistable structure |
| CN109154627A (en) * | 2016-04-12 | 2019-01-04 | 尼古拉斯·皮埃尔·德洛尔姆 | Low-power accelerometer |
| CN109239397A (en) * | 2017-07-06 | 2019-01-18 | 蒙特雷布勒盖股份有限公司 | Surge indicator for wrist-watch |
| CN110571069A (en) * | 2019-08-20 | 2019-12-13 | 南京理工大学 | Micro-mechanical collision switch control device |
| CN110676116A (en) * | 2018-07-03 | 2020-01-10 | 北汽福田汽车股份有限公司 | Angular acceleration switch and switch assembly |
| CN111981075A (en) * | 2020-08-21 | 2020-11-24 | 南京航空航天大学 | Quasi-zero rigidity vibration isolation system with bending moment resisting effect |
| CN114233931A (en) * | 2021-11-16 | 2022-03-25 | 国网甘肃省电力公司 | Energy consumption support and gas-insulated metal-enclosed switchgear system |
| CN114414846A (en) * | 2022-01-26 | 2022-04-29 | 西安交通大学 | Structure for improving mode separation ratio of Fabry-Perot MEMS acceleration sensitive chip |
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2009
- 2009-12-21 CN CN200910254426A patent/CN101752141A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157298A (en) * | 2011-03-22 | 2011-08-17 | 西安电子科技大学 | Permanent magnetic collision sensor |
| CN102163514A (en) * | 2011-04-08 | 2011-08-24 | 赵剑 | Permanent magnet type universal collision sensor |
| CN102568923A (en) * | 2011-12-31 | 2012-07-11 | 大连理工大学 | Dual-threshold three-stable-state collision sensor |
| EP2682975A3 (en) * | 2012-07-04 | 2015-04-01 | WB Electronics S.A. | Electric current inertial switch |
| CN103196549A (en) * | 2013-04-08 | 2013-07-10 | 重庆绿色智能技术研究院 | Vibration monitoring system and power management method thereof |
| CN104143473A (en) * | 2013-05-06 | 2014-11-12 | 重庆绿色智能技术研究院 | Acceleration switch and control method of acceleration switch |
| CN109154627B (en) * | 2016-04-12 | 2020-10-30 | 尼古拉斯·皮埃尔·德洛尔姆 | Low power accelerometer |
| CN109154627A (en) * | 2016-04-12 | 2019-01-04 | 尼古拉斯·皮埃尔·德洛尔姆 | Low-power accelerometer |
| WO2018059050A1 (en) * | 2016-09-30 | 2018-04-05 | 广东美的环境电器制造有限公司 | Fan and switch on/off control method and apparatus thereof |
| CN109239397A (en) * | 2017-07-06 | 2019-01-18 | 蒙特雷布勒盖股份有限公司 | Surge indicator for wrist-watch |
| CN108240415A (en) * | 2017-12-04 | 2018-07-03 | 上海交通大学 | The big load high damping concretes of compound buckled beam/plate negative stiffness dynamic vibration absorber |
| CN110676116A (en) * | 2018-07-03 | 2020-01-10 | 北汽福田汽车股份有限公司 | Angular acceleration switch and switch assembly |
| CN110676116B (en) * | 2018-07-03 | 2020-12-29 | 北汽福田汽车股份有限公司 | Angular acceleration switch and switch assembly |
| CN109103049A (en) * | 2018-09-13 | 2018-12-28 | 中国工程物理研究院电子工程研究所 | A kind of MEMS inertia switch based on V-type beam bistable structure |
| CN110571069A (en) * | 2019-08-20 | 2019-12-13 | 南京理工大学 | Micro-mechanical collision switch control device |
| CN111981075A (en) * | 2020-08-21 | 2020-11-24 | 南京航空航天大学 | Quasi-zero rigidity vibration isolation system with bending moment resisting effect |
| CN114233931A (en) * | 2021-11-16 | 2022-03-25 | 国网甘肃省电力公司 | Energy consumption support and gas-insulated metal-enclosed switchgear system |
| CN114414846A (en) * | 2022-01-26 | 2022-04-29 | 西安交通大学 | Structure for improving mode separation ratio of Fabry-Perot MEMS acceleration sensitive chip |
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Application publication date: 20100623 |