CN204389100U - A kind of observation device surveying vacuum pressure based on plane-parallel capacitor - Google Patents
A kind of observation device surveying vacuum pressure based on plane-parallel capacitor Download PDFInfo
- Publication number
- CN204389100U CN204389100U CN201520013311.1U CN201520013311U CN204389100U CN 204389100 U CN204389100 U CN 204389100U CN 201520013311 U CN201520013311 U CN 201520013311U CN 204389100 U CN204389100 U CN 204389100U
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- Prior art keywords
- plane
- parallel capacitor
- box body
- vacuum pressure
- observation device
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Abstract
The utility model discloses a kind of observation device surveying vacuum pressure based on plane-parallel capacitor, it is characterized in that: comprising: be arranged at the plane-parallel capacitor (2) in box body (1), the positive plate upper surface of described plane-parallel capacitor (2) is fixed on the top of described box body (1) by fixed strip (3), the negative plate lower surface of described plane-parallel capacitor (2) is fixed on the bottom of described box body (1) by resilient strip (4), the lower surface of described negative plate is provided with the corrugated tube (5) for the described negative plate of airtight connection and described box body (1) bottom, wire (9) passes described box body (1) after being connected with negative plate with the positive plate of described plane-parallel capacitor (2) respectively and is connected with pick-up unit.What the utility model provided a kind ofly surveys the observation device of vacuum pressure based on plane-parallel capacitor, and measured value is accurate, accuracy of reading and true and reliable, and cost is low, is applicable to wide popularization and application.
Description
Technical field
The utility model relates to a kind of vacuum pressure observation device, particularly a kind of for vacuum pressure observation device when vacuum preloading and Combined Vacuum-surcharge Preloading.
Background technology
When adopting vacuum preloading or vacuum surcharge preloading to process soft soil foundation, the measurement of vacuum tightness all can be related to.The size of vacuum pressure and transmission directly have influence on the quality of construction quality, and therefore the measurement of vacuum tightness can only be carried out at the scene.
At present, the on-the-spot vacuum tightness observation procedure that engineering generally adopts, be bury vacuum tube underground every a segment distance in soil layer, and vacuum tube guided to earth's surface and vacuum meter couples together, by carrying out size and the transfer law that read-record observes vacuum pressure in soil layer to vacuum meter.This method can cause some problems, as vacuum tube is being subject to soil pressure impact along soil depth direction, vacuum tube may be caused to be subject to soil pressure and to block, or to enter in pipe at vacuum tube bottom port soil particle and cause blocking, and vacuum tube is generally embedded in underground, if be difficult to effectively process when there is blocking, the observation of vacuum tightness can be had influence on like this, be difficult to the vacuum pressure size observing a certain depth in underground, engineering staff can be had influence on and recognize that the transfer law of vacuum pressure is to carry out rationally effective assessment to construction quality in time; Add that vacuum meter is placed in earth's surface, be vulnerable to the impact of human factor and natural cause and destroy, more renew table and will produce certain expense again, economical not; Vacuum meter is total indicator reading in addition, and the personal error of reading is large, thus the evaluation result of impact to engineering.
Utility model content
Technical problem to be solved in the utility model is, provides one wire to replace vacuum tube, the vacuum pressure in soil layer is transferred to electric signal and exports, and measurement result surveys the observation device of vacuum pressure accurately based on plane-parallel capacitor; Further, the utility model provides a kind of reading accuracy high, pick-up unit display numeral, can avoid the observation device surveying vacuum pressure based on plane-parallel capacitor of reading error; Further, the utility model adopts a playscript with stage directions device just can measure all vacuum pressures, reduce costs, workmen can be prevented for using inferior materials and turning out substandard goods simultaneously, vacuum meter is juggled things, make also to make vacuum tightness reach designing requirement when turn on pump rate is less, therefore the utility model can be avoided faking, measured value is true and reliable.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of observation device surveying vacuum pressure based on plane-parallel capacitor, it is characterized in that: comprising: be arranged at the plane-parallel capacitor in box body, the positive plate upper surface of described plane-parallel capacitor is fixed on the top of described box body by fixed strip, the negative plate lower surface of described plane-parallel capacitor is fixed on the bottom of described box body by resilient strip, the lower surface of described negative plate is provided with the corrugated tube for the described negative plate of airtight connection and described box body bottom, described box body is divided into two chambers by described corrugated tube, be respectively the airtight chamber being positioned at corrugated tube outside and the chamber being positioned at described bellows interior, bottom and the chamber of described box body are all connected with vertical tube, wire passes described box body after being connected with negative plate with the positive plate of described plane-parallel capacitor respectively and is connected with pick-up unit.
Described pick-up unit comprises impedometer.
The outlet place of described wire on described box body is provided with the sealing ring preventing from leaking gas; Described wire wraps up at the joint waterproof material on earth's surface.
Described waterproof material comprises plastic tape.
Described resilient strip comprises spring, and described spring is uniformly distributed in four angles of described negative plate; Described spring is positioned at described bellows interior; The lower surface of described negative plate scribbles insulation course.
The number of described resilient strip is 4.
Described fixed strip comprises electro-insulating rubber plastic strip.
Described corrugated tube is upward and downward Collapsible structure.
Described corrugated tube can under the drive of spring, without resistance along with negative plate moving or declining.
Negative plate and box body are sealed by corrugated tube in negative plate surrounding, ensure airtight chamber's positive confinement, in case there is aqueous vapor to invade between two battery lead plates in vertical tube, chamber communicates with vertical tube, wrap up by water permeable membrane bottom vertical tube 7, ensure that interface position is air tight simultaneously everywhere, finally connect two-plate with wire 3 and wire is drawn earth's surface.
The bottom of described vertical tube is coated with water permeable membrane.
The length of described vertical tube is 10 ~ 20cm, and described vertical tube is connected with the center of described box body, and the material of described vertical tube comprises hard plastic.
The material of described box body comprises plastics, and described box body is seal box.
Described plane-parallel capacitor is positioned at the center of described box body.
A kind of observation device surveying vacuum pressure based on plane-parallel capacitor that the utility model provides, impedometer is adopted indirectly to measure vacuum pressure, the expense using vacuum meter can be saved, an instrument just can measure all vacuum pressures, reduce costs, workmen can be prevented for using inferior materials and turning out substandard goods simultaneously, vacuum meter is juggled things, make also to make vacuum tightness reach designing requirement when turn on pump rate is less, what such monitoring personnel surveyed is false vacuum degree, causes vacuum preloading, piling prepressing and joint preloading action effect thereof to be deteriorated; Replace traditional vacuum tube with wire, vacuum tube can be avoided to block by soil pressure affects in soil layer, the accuracy that impact is measured; What impedometer showed is pure digi-tal, and reading accuracy is high, can avoid the error adopting vacuum meter reading when observing.What the utility model provided a kind ofly surveys the observation device of vacuum pressure based on plane-parallel capacitor, and measured value is accurate, accuracy of reading and true and reliable, and cost is low, is applicable to wide popularization and application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, a kind of observation device surveying vacuum pressure based on plane-parallel capacitor, comprise: be arranged at the plane-parallel capacitor 2 in box body 1, the positive plate upper surface of described plane-parallel capacitor 2 is fixed on the top of described box body 1 by fixed strip 3, the negative plate lower surface of described plane-parallel capacitor 2 is fixed on the bottom of described box body 1 by resilient strip 4, the lower surface of described negative plate is provided with the corrugated tube 5 for the described negative plate of airtight connection and described box body 1 bottom, described box body 1 is divided into two chambers by described corrugated tube 5, be respectively the airtight chamber 6 being positioned at corrugated tube 5 outside and the chamber 7 being positioned at described corrugated tube 5 inside, bottom and the chamber 7 of described box body 1 are all connected with vertical tube 8, wire 9 passes described box body 1 after being connected with negative plate with the positive plate of described plane-parallel capacitor 2 respectively and is connected with pick-up unit.
Described box body 1 is square.
Described pick-up unit comprises impedometer.
The outlet place of described wire 9 on described box body 1 is provided with the sealing ring preventing from leaking gas; Described wire 9 wraps up at the joint waterproof material on earth's surface.
Described resilient strip 4 comprises spring, and described spring is uniformly distributed in four angles of described negative plate; It is inner that described spring is positioned at described corrugated tube 5; The lower surface of described negative plate scribbles insulation course.
Described fixed strip 3 comprises electro-insulating rubber plastic strip.
Described corrugated tube 5 is upward and downward Collapsible structure.
The bottom of described vertical tube 8 is coated with water permeable membrane 10.
The length of described vertical tube 8 is 10 ~ 20cm, and described vertical tube 8 is connected with the center of described box body 1, and the material of described vertical tube 8 comprises hard plastic.
The material of described box body 1 comprises plastics, and described box body 1 is seal box.
Described plane-parallel capacitor 2 is positioned at the center of described box body 1.
First plane-parallel capacitor 2 positive plate is connected with box body 1 by fixed strip 3, four angles of negative plate are connected with box body 1 by one group of spring, one deck insulating material is coated with bottom negative plate, prevent negative plate from directly contacting with spring, and box body 1 is sealed by corrugated tube 5 in negative plate surrounding, composition airtight chamber 6 and chamber 7, and keep airtight chamber 6 positive confinement, two interpolars are invaded with the aqueous vapor in anti-gas-leak and vertical tube 8, the accuracy that impact is measured, needs to ensure that negative plate can only move up and down and can not tilt simultaneously.Chamber 7 communicates with vertical tube 8 and ensures that interface position is air tight.Finally connect the positive and negative pole plate of plane-parallel capacitor 2 respectively with wire 9 and wire is guided to earth's surface, carrying out joint process, adopting impedance magnitude between impedometer observation capacitor board.Encapsulation process need be carried out to outlet when being drawn from box body 1 by wire 9, ensureing that airtight chamber 6 is air tight.Must accomplish air tight when vertical tube 8 is connected with box body 1, hard plastic tube is adopted to be prevent vertical tube 8 under soil pressure effect be squeezed and block, affect measurement effect, vertical tube 8 need reserve a segment length, general 10-20cm, prevents underground water under effect of water pressure, entering chamber 7 and spring contact, makes spring corrosion affect the accuracy measured, bottom vertical tube 8, termination water permeable membrane 10 is wrapped up simultaneously, prevents soil particle from entering in vertical tube 8 and causes blocking.The joint application plastic tape of wire 9 on earth's surface or other waterproof materials parcel, make wire corrosion affect observed result in case the rainy day drenches.
After work in every is all carried out, first record the capacitive reactance of the plane-parallel capacitor 2 at a certain depth of soil layer with impedometer
x c .
X C =1/(
2πfC) （1）
C=
εS/(4
πkd) （2）
In formula (1):
x c represent plane-parallel capacitor capacitive reactance, unit is
Ω;
frepresent ac frequency, be generally 50
hz;
crepresent plane-parallel capacitor electric capacity, unit is
f.
In formula (2):
ε 0 represent dielectric constant in vacuum,
ε 0 ≈ 8.86*10
-12 f/m;
ε r represent relative dielectric constant;
εrepresent the specific inductive capacity in air, in air
ε r =
ε/
ε 0 =1;
sthe two parallel-plate right opposites representing plane-parallel capacitor amass, and unit is
m 2 ;
krepresent electrostatic force constant, get 9.0*10
9 n. m 2 / C 2 ;
drepresent two-plate spacing, unit is
m.
Obtained by formula (1), formula (2):
d=
fεX C S/(2
k) （3）
By measuring the impedance at the corresponding plane-parallel capacitor 2 of a certain depth of soil layer
x c value, calculate the initial separation of two-plate according to formula (3)
d 0 .
After starting to vacuumize, to the utility model being in more than groundwater level, vacuumized and affect, chamber 7 shrinks, and airtight chamber 6 expands, plane-parallel capacitor 2 negative plate tension, and displacement is downward; To the utility model being in below groundwater level, because groundwater level reduces, chamber 7 pressure reduces, expanding gradually makes negative plate move upward, moving up and down of negative plate causes the spacing of two-plate to change, and according to this principle, measures the impedance after vacuumizing
x c value, and convolution (3) calculates two-plate spacing
d, then have:
Δ
d=|
d 0 -
d| （4）
Then can try to achieve vacuum pressure:
F=
KΔ
d （5）
P=
F/
S （6）
K=4
k 0 （7）
In formula (4): Δ
drepresentative vacuumizes front and back two-plate pitch difference, and unit is
m.
In formula (5):
frepresent spring pressure value, unit is
n;
krepresent the overall stiffness coefficient of groups of springs, unit is
n/m.
In formula (6):
prepresent vacuum pressure value, unit is
pa;
srepresent parallel-plate right opposite to amass, unit is
m 2 .
In formula (7):
k 0 represent the stiffness factor of single spring, unit is
n/m.
Wire 9 should be docked after each measurement, in and the electric charge of two-plate.When reason is break line 9 after each observation, the electric charge on two-plate can not pop-off, if touch wire 9 two ends because of carelessness, can cause electric shock accidents, for the security consideration of engineering, wire two ends should be docked after measurement.
The utility model has following beneficial effect:
(1) vacuum tube adopting wire 9 to replace classic method to adopt, vacuum pressure in soil layer is transferred to electric signal to export, the linear loss of gaseous tension in vacuum tube can be avoided, and in wire 9 signal to be delivered in soil layer not by the impact of soil pressure, can measuring accuracy be improved, the transfer law of vacuum pressure in soil layer can be studied more accurately.
(2) replace traditional vacuum meter observation vacuum pressure with impedometer, decrease and use the expense of vacuum meter or the expense that vacuum meter destroys by construction factor or is subject to corrosion and destroys and produce in engineering, reduce construction costs to a certain extent.
(3) what impedometer was shown by display is pure digi-tal, and impedometer by measured value automatic storage in Instrument memory, can output to computer table by being connected with computing machine, easy to operate, reduces error during reading.
The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. survey the observation device of vacuum pressure based on plane-parallel capacitor for one kind, it is characterized in that: comprising: be arranged at the plane-parallel capacitor (2) in box body (1), the positive plate upper surface of described plane-parallel capacitor (2) is fixed on the top of described box body (1) by fixed strip (3), the negative plate lower surface of described plane-parallel capacitor (2) is fixed on the bottom of described box body (1) by resilient strip (4), the lower surface of described negative plate is provided with the corrugated tube (5) for the described negative plate of airtight connection and described box body (1) bottom, described box body (1) is divided into two chambers by described corrugated tube (5), be respectively and be positioned at the outside airtight chamber (6) of corrugated tube (5) and be positioned at the inner chamber (7) of described corrugated tube (5), bottom and the chamber (7) of described box body (1) are all connected with vertical tube (8), wire (9) passes described box body (1) after being connected with negative plate with the positive plate of described plane-parallel capacitor (2) respectively and is connected with pick-up unit.
2. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: described pick-up unit comprises impedometer.
3. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: the outlet place of described wire (9) on described box body (1) is provided with the sealing ring preventing from leaking gas; Described wire (9) wraps up at the joint waterproof material on earth's surface.
4. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, it is characterized in that: described resilient strip (4) comprises spring, described spring is uniformly distributed in four angles of described negative plate; It is inner that described spring is positioned at described corrugated tube (5); The lower surface of described negative plate scribbles insulation course.
5. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: described fixed strip (3) comprises electro-insulating rubber plastic strip.
6. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: described corrugated tube (5) is upward and downward Collapsible structure.
7. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: the bottom of described vertical tube (8) is coated with water permeable membrane (10).
8. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, it is characterized in that: the length of described vertical tube (8) is 10 ~ 20cm, described vertical tube (8) is connected with the center of described box body (1), and the material of described vertical tube (8) comprises hard plastic.
9. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, it is characterized in that: the material of described box body (1) comprises plastics, described box body (1) is seal box.
10. a kind of observation device surveying vacuum pressure based on plane-parallel capacitor according to claim 1, is characterized in that: described plane-parallel capacitor (2) is positioned at the center of described box body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520013311.1U CN204389100U (en) | 2015-01-08 | 2015-01-08 | A kind of observation device surveying vacuum pressure based on plane-parallel capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520013311.1U CN204389100U (en) | 2015-01-08 | 2015-01-08 | A kind of observation device surveying vacuum pressure based on plane-parallel capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204389100U true CN204389100U (en) | 2015-06-10 |
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|---|---|---|---|
| CN201520013311.1U Expired - Fee Related CN204389100U (en) | 2015-01-08 | 2015-01-08 | A kind of observation device surveying vacuum pressure based on plane-parallel capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947813A (en) * | 2020-08-10 | 2020-11-17 | 安徽大学 | Fully-flexible capacitive three-dimensional force touch sensor based on corrugated pipe microstructure |
| CN112729641A (en) * | 2020-12-01 | 2021-04-30 | 上海空间推进研究所 | System and method for measuring response time of cold air thruster based on variable dielectric capacitance bridge |
-
2015
- 2015-01-08 CN CN201520013311.1U patent/CN204389100U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947813A (en) * | 2020-08-10 | 2020-11-17 | 安徽大学 | Fully-flexible capacitive three-dimensional force touch sensor based on corrugated pipe microstructure |
| CN112729641A (en) * | 2020-12-01 | 2021-04-30 | 上海空间推进研究所 | System and method for measuring response time of cold air thruster based on variable dielectric capacitance bridge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20190108 |