CN201096555Y - Compensation type digital micro manometer - Google Patents

Abstract

The utility model adopts the following technical proposal to realize the purposes that a compensation digital micromanometer comprises a long screw rod, a shell tube which supports the long screw rod, a water box arranged on the long screw rod, a static pressure tap, a dynamical pressure tap, a displacement sensor arranged on the water box and a digital display connected with the displacement sensor through a cable; the displacement sensor is provided with an A/D converter which converts the electrical signal obtained by the displacement sensor into the digital signal which is transmitted to the digital display through the cable and is displayed in decimal digit. The accuracy of the displacement sensor can reach 0.01 mm (0.1 Pa). The compensation digital micromanometer provided in the utility model has the advantages of accurate display, eliminating the visual error, convenient observation and application.

Description

The digital microbarograph of offset-type

Technical field

The utility model relates to field of instrumentation technology, especially relates to the digital microbarograph of a kind of offset-type.

Background technology

Microbarograph belongs to a kind of of pressure instrumentation.Microbarograph is used to measure the slight pressure of noncorrosive gases, really presses and pressure differential, also can be used to calibrate other pressure gauge, can produce the unit use for laboratory and measurement unit family planning.

Fig. 1 shows existing a kind of offset-type microbarograph, and this microbarograph comprises fine setting part, level test section, reflective mirror part, and housing parts.

The trimming part branch comprises long bolt 101, be fixed on the fine tuning dish that is carved with 200 five equilibriums 102 on the long bolt, driven the water casket 103 that moves upward or downward by long bolt, and be installed on water casket 103 static pressure and connect the accurate piece of the indication of chewing on 104 (not label), the accurate piece of this indication moves in the middle of degree plate 106 and letter stencil 107, thus the displacement height of indication water outlet casket 103.

Level observation part comprises the level shown in the figure 108, in order to observation liquid level variation in dynamic pressure tube 105 is stressed the back tube.

The reflective mirror part, in order to the contact situation of the level head in the reflection flash ranging tube with liquid level, it is that the microbarograph reading is adjusted " basic point " that the sharp shadow point with its inverted image of level head is joined.

Housing parts comprises the display pipe 116 shown in the figure, in order to support long bolt 101, air level 109 and set screw (not shown) is housed simultaneously on housing, vertical in order to the long bolt 101 of regulating microbarograph and dynamic pressure tube 105.

This microbarograph pours into distilled water by screwing off dynamic pressure tube end sealing screw 110, regulates setting nut 111, and observes the position of level 108, can finish initial zeroing operation.Connect by dynamic pressure tube 105 and static pressure and to chew 104 and join with institute's measuring pressure, can obtain measurement result.Numerical value on result's degree of comprising plate and the numerical value on the fine tuning dish, two number sums are needed numerical value.Tested force value is determined according to following formula:

$P=h\·g\·\mathrm{\ρ}(1-\frac{{\mathrm{\ρ}}^{\′}}{\mathrm{\ρ}})\·{10}^{-3}$

P-is by measuring pressure (handkerchief)

H-instrument readout (millimeter)

The density of water (kilograms per cubic meter) under ρ-proving temperature

Atmospheric density (kilograms per cubic meter) under ρ '-environment for use temperature

G-place to use acceleration of gravity (rice/square second).

Existing microbarograph connects to chew at water casket static pressure the accurate piece of indication is housed, and the accurate piece of this indication moves the displacement height of indicating the water outlet casket in the middle of degree plate and letter stencil.The indicating mode that this kind device is adopted is by the scale in the naked-eye observation millimeter level, and the observer is very painstaking in operation, and inconvenience, the collimation error are very big, with visual observation, can't observe accurate in the millimeter level; Add institute's measuring pressure and will lean on top fine tuning dish and two numerical value sums of degree plate as displacement height value (being force value), these two numerical value all by eyesight observation, well imagine that the accuracy of an instrument can't guarantee.

Summary of the invention

The purpose of this utility model is the defective at prior art, provides a kind of and can eliminate the collimation error, observes the digital microbarograph of offset-type accurately.

The utility model is realized above-mentioned purpose by adopting following technical scheme: the digital microbarograph of a kind of offset-type, comprise long bolt, support long bolt display pipe, be arranged at water casket on the long bolt, the static pressure that is used for receiver gases connects to chew to connect with dynamic pressure and chews, be arranged at the displacement transducer on the water casket, and the digital indicator that is connected by cable with this displacement transducer.Described connect to chew by static pressure with dynamic pressure connect the gravity of chewing liquid self in the gas that received and the water casket, water casket internal pressure value is changed, thereby make level change.

Described digital indicator is arranged on the described display pipe, is liquid crystal digital display.Described displacement transducer has an A/D converter, and this A/D converter is a digital signal with the electrical signal conversion that this displacement transducer produced, and is sent to described digital indicator through cable again, directly shows with tens digit.The precision of described displacement transducer can reach 0.01 millimeter (0.1 handkerchief).Described displacement transducer and described digital indicator use the 1.5V battery can work 1 to 2 year.

Adopt the digital microbarograph of offset-type provided by the utility model, can eliminate the collimation error, show accurately, thereby the precision and the accuracy that have improved microbarograph are observed easy to use.

Description of drawings

Fig. 1 is the structural representation of existing a kind of offset-type microbarograph;

Fig. 2 is the structural representation of the digital microbarograph of the utility model offset-type;

Embodiment

Hereinafter with reference to accompanying drawing, be described in detail specific embodiments of the present invention.

On the basis of existing offset-type microbarograph shown in Figure 1, the utility model has mainly been done following improvement: above the water casket displacement transducer is set, the electric signal with displacement transducer output is passed to the digital indicator that is arranged on the display pipe by cable then.

See also Fig. 2, this figure shows structural representation of the present utility model.Preferred embodiment of the present utility model comprises long bolt 201, supports the display pipe 216 of long bolt 201, is arranged at the water casket 203 on this long bolt 201, and the static pressure that is used for receiver gases connect chew 204 and dynamic pressure connect and chew 205, the gravity of liquid self in gas that this received and the water casket 203, water casket 203 internal pressure values are changed, thereby make level change.In addition, the utility model also is provided with displacement transducer 214, the cable 213 that is connected with this displacement transducer 214 and is connected with this cable 213 on water casket 203 digital indicator 212, digital indicator 212 is convexly set on the display pipe 216.Described displacement transducer 214 has A/D converter.Digital microbarograph among this embodiment is realized initial zeroing by following element: be positioned at dynamic pressure and connect the sealing screw 210 of chewing 205 tops, be positioned at dynamic pressure and connect the setting nut 211 of chewing 205 belows, and be positioned at level 208 and air level 209 on the display pipe 216.

During initial the zeroing, screw off sealing screw 210, pour into distilled water, allot fine tuning dish 202 and setting nut 111, when the shadow point of the level head point of observing level 208 and its inverted image joins and air level 209 when being in the liquid level middle position, can finish initial zeroing.Dynamic pressure tube 105 and static pressure connect chew 104 and join with institute's measuring pressure, long bolt 201 drives water caskets 203 and moves up and down, and makes water casket 203 inner level change, and displacement transducer 214 induction level change are electric signal with this information translation, are passed to A/D converter.In this embodiment, adopt capacitive transducer, because its volume is less relatively, easy to use, precision also can reach 0.01 millimeter (0.1 handkerchief), can satisfy the request for utilization under most situation fully; Certainly, also can according to circumstances adopt other sensors, as laser sensor.The precision of the displacement transducer in the present embodiment can reach 0.01 millimeter.The utility model power consumption is very little, and described displacement transducer and digital indicator use the 1.5V battery to get final product work 1 to 2 year.

During work, displacement transducer changes and lifting with liquid level, and the electric signal that will indicate this liquid level information through A/D converter with the digital signal of analog signal conversion for being complementary with digital indicator, directly show by digital indicator with tens digit.

The utility model is by installing high accuracy displacement sensor on the water casket, high/low degree by the displacement of displacement sensor water casket, and output displacement high-low signal, thereby reduced visual observation sum of errors scale reading error, improved the precision and the accuracy of instrument and observed easy to use.

The utility model energy-conserving and environment-protective, noiseless, pollution-free, utmost point low power consuming, the button cell of 1.5v can use 1 to 2 year, and the use value height is easy to maintenance.

Claims (3)

1. digital microbarograph of offset-type, comprise long bolt, support the display pipe of long bolt, the static pressure that is arranged at the water casket on the long bolt and is used for receiver gases to connect to chew to connect and chew with dynamic pressure, it is characterized in that: the digital microbarograph of described offset-type also comprises the displacement transducer that is arranged on the water casket, and is located at digital indicator on the display pipe with this displacement transducer by what cable was connected.

2. the digital microbarograph of offset-type according to claim 1, it is characterized in that: this displacement transducer also has A/D converter.

3. the digital microbarograph of offset-type according to claim 1 is characterized in that: described digital indicator is a LCD.