CN201540147U - Bell volume revesal calibrating device - Google Patents

Abstract

The utility model provides a bell volume revesal calibrating device. A cavity in the bell is connected with the top of a sealed container through a pipe; the sealed container is respectively connected with outlets of a small flow pipe and a mass flow pipe; the inlets of the small flow pipe and the mass flow pipe are respectively connected with a port of a three-way valve on the bottom of a standard measuring device through the pipe; an electromagnetic valve is provided on the small flow pipe; a hand-operated valve is provided on the mass flow pipe; and the other port of the three-way valve on the bottom of the standard measuring device is connected with the bottom of a high-level water tank through the pipe. The utility model could realize a high accuracy revesal calibration for the bell measuring volume and improves the measuring accuracy of a helium flow standard device taking the bell as the main standard measuring device.

Description

A kind of calibrating reverse stroke of bell-jar volume device

Technical field

The utility model belongs to measurement of gas flow technical field, is specifically related to a kind of calibrating reverse stroke of bell-jar volume device of pin-point accuracy.

Background technology

The bell-jar gas flow calibrating device with bell jar as the primary standard device, its flow measurement principle is: movable uniform cross section cylindrical shape bell jar and fixing liquid bath constitute the sealed air-space of a variable volume, the bell jar outer wall is provided with the triggering baffle plate, in order to the mark metered volume, bell jar is in motion process, trigger baffle plate and successively trigger the optoelectronic switch generation control signal that is fixed on the liquid bath, the control time set is finished the measurement that bell jar is discharged (or inflow) specific gas amount Δ V required time Δ t, calculates standard volume flow q by formula (1) _V:

$q_V=\frac{\mathrm{\ΔV}}{\mathrm{\Δt}}...................\left(1\right)$

In the formula, Δ V is exactly the volume of mark between two optoelectronic switches.

Because the use of conventional bell jar, all are the calibrations that are used for air mass flow, still can't be directly used in and demarcate the helium gas flow meter, and the calibration of helium gas flow meter should be the use of bell jar revesal, the demarcation of positive stroke can't be satisfied the metering section volume accuracy of bell jar when revesal.

Summary of the invention

The purpose of this utility model is to provide a kind of calibrating reverse stroke of bell-jar volume device of pin-point accuracy, it realizes the demarcation of the revesal pin-point accuracy of bell jar metered volume, the real work state of real simulation helium gas flow standard set-up, and then raising is the accuracy of measurement level of the helium gas flow standard set-up of primary standard device with the bell jar.

Realize the technical scheme of the utility model purpose: a kind of calibrating reverse stroke of bell-jar volume device, described bell jar and fixing liquid bath constitute the sealed cavity of a variable volume, sealed cavity is connected with the top of airtight container by pipeline in the bell jar, described airtight container is connected with large flow pipe way outlet end with the low discharge pipeline respectively by water injecting pipeline, the inlet end on low discharge pipeline and large flow pipe road all is connected by a mouth of the T-valve on pipeline is bottom standard measuring device, on the low discharge pipeline, be provided with solenoid valve, on the large flow pipe road, be provided with manually-operated gate; Another mouthful of T-valve on the bottom of standard measuring device is connected with the elevated tank bottom by pipeline.

Aforesaid a kind of calibrating reverse stroke of bell-jar volume device, it is fixed with the triggering baffle plate on bell jar, be provided with two optoelectronic switches in top and bottom that are fixed on the liquid bath in the bell jar side, when driving, bell jar triggers the baffle plate rising, trigger baffle plate and trigger optoelectronic switch generation photosignal, close by the photosignal control electromagnetic valve.

Aforesaid a kind of calibrating reverse stroke of bell-jar volume device, it is provided with mozzle in airtight container, the mozzle top connects with the water injecting pipeline with the low discharge pipeline is connected with large flow pipe way outlet end at airtight container top, the mozzle bottom extends to sealing container bottom central authorities, apart from bottom 5～10mm.

Aforesaid a kind of calibrating reverse stroke of bell-jar volume device, its described standard measuring device is gone into the formula standard measuring device for amount; Described airtight container and low discharge pipeline and large flow pipe road are the glass transparent material.

Aforesaid a kind of calibrating reverse stroke of bell-jar volume device, it is provided with manually-operated gate on elevated tank outlet at bottom end pipeline; On airtight container and low discharge pipeline and water injecting pipeline that the large flow pipe road is connected, be provided with manually-operated gate; On sealing container bottom endpiece pipeline, be provided with manually-operated gate; Lead at the airtight container top on the pipeline of bell jar inside and be provided with manually-operated gate.

Effect of the present utility model is: calibrating reverse stroke of bell-jar volume device described in the utility model, by low discharge pipeline and the water filling of large flow pipe road direction airtight container, replace commutator with solenoid valve, adopt initial sum to stop two photoelectric switching signals, the calibration error that commutator open and close speed inconsistency is brought when having eliminated conventional dynamic calibration for closing the calibration program of valve control; Airtight container and pipeline are the glass transparent material, and parts are arranged vertically, and be well arranged, is convenient to the pipeline exhaust and improves drainage speed, improved calibration repeatability and stable; Set up mozzle in the airtight container, guaranteed liquid level steadily rise in the injecting process, avoided dabbling and wall on leave the generation of micro-bubble phenomenon, further improved calibration accuracy;

By adopting the utility model device, the volumetric measurement of 50L section repeatability as a result is 0.013%, the volumetric measurement of 5L section repeatability as a result is 0.048%, the flow measurement expanded uncertainty of device reaches 0.03%～0.1% (k=2), accuracy has reached 0.1 grade, and the bell jar of unidimensional size can reach pin-point accuracy grade like this and still belong to leading at home and abroad.

Description of drawings

Fig. 1 conventional dynamic mass method bell jar capacity calibrating installation synoptic diagram;

Fig. 2 calibrating reverse stroke of bell-jar volume device described in the utility model synoptic diagram;

Among the figure: the 1-bell jar; 2,3,5,6,7-valve; The 4-airtight container; The 8-commutator; The 9-recirculatory pipe; The 10-water pump; The 11-weighing container; The 12-weighing-appliance; The 13-pond; The 14-elevated tank; The 26-T-valve; The 16-container of weighing; The 17-electronic balance; The 18-solenoid valve; 19-low discharge pipeline; 15,20,23,28,29-manually-operated gate; The 21-airtight container; The 22-mozzle; The 24-scale; The 25-standard measuring device; 27-large flow pipe road; The 30-bell jar; 31-top light electric switch; 32-triggers baffle plate; 33-bottom light electric switch; The 34-liquid bath.

Embodiment

Below in conjunction with the drawings and specific embodiments a kind of calibrating reverse stroke of bell-jar volume device described in the utility model is further described.

As shown in Figure 2, a kind of calibrating reverse stroke of bell-jar volume device described in the utility model, constitute the sealed cavity of a variable volume by bell jar 30 and fixing liquid bath 34, on bell jar 30, be fixed with and trigger baffle plate 32, be provided with two optoelectronic switches in top and bottom 31,33 that are fixed on the liquid bath in bell jar 30 sides.Sealed cavity is connected by the top of pipeline with airtight container 21 in the bell jar 30, is provided with manually-operated gate 29 on this pipeline.On airtight container 21 outlet at bottom end pipelines, be provided with manually-operated gate 23, in airtight container 21, be provided with mozzle 22, mozzle 22 bottoms extend to airtight container 21 bottom center (apart from bottom 10mm), mozzle 22 tops are connected with water injecting pipeline one end of water filling in airtight container 21, low discharge pipeline 19 and large flow pipe road 27 endpiece all are connected this water injecting pipeline other end, are provided with manually-operated gate 20 on water injecting pipeline.On low discharge pipeline 19, be provided with solenoid valve 18, on large flow pipe road 27, be provided with manually-operated gate 28.The inlet end on low discharge pipeline 19 and large flow pipe road 27 all is connected by the mouth that pipeline and amount are gone into the T-valve 26 on formula standard measuring device 25 bottoms, T-valve 26 another mouthfuls on the bottom of standard measuring device 25 are connected with elevated tank 14 bottoms by pipeline, are provided with manually-operated gate 15 on this pipeline.

Above-mentioned airtight container 21 and low discharge pipeline 19 and large flow pipe road 27 are the glass transparent material, and wherein large flow pipe road latus rectum is about 5 times of low discharge pipeline latus rectum.Be flexible coupling and locate to be silicone tube, parts are arranged vertically, and are well arranged.

Be further described adopting device described in the utility model to carry out the calibrating reverse stroke of bell-jar volume method below.

(1) exhaust, prerun: operation T-valve 26, open manually-operated gate 15, standard measuring device 25 is communicated with the elevated tank 14 in left side, in elevated tank 14 phase standard measuring devices 25, be filled to completely.Close manually-operated gate 15, operate T-valve 26 once more, standard measuring device is communicated with right side low discharge pipeline 19 and large flow pipe road 27, open solenoid valve 18 and manually-operated gate 28,29, move the water to flow in the airtight container 21, so circulation several times, make each section pipeline be full of water, draining wherein air, and each wall is fully soaked, close all valves;

(2) operation T-valve 26, standard measuring device 25 is communicated with the elevated tank 14 in left side, in standard measuring device 25, inject appropriate amount water (guarantee that step 3 solenoid valve 18 turn-offs, water stop to inject surplus water in the standard measuring device of back be about to be calibrated section volume about 0.5%), mix up the bell jar position by exhaust in the bell jar or inflation, reserve preparation section (make trigger on the bell jar baffle plate 32 leave the about 1cm in bottom light electric switch 33 positions get final product);

(3) operation T-valve 26, standard measuring device 25 is communicated with right side low discharge pipeline 19 and large flow pipe road 27, open manually-operated gate 20, this moment, water just injected airtight container 21 by standard measuring device 25 because solenoid valve 18 is in on-state, and bell jar 30 rises thereupon, when waiting to trigger baffle plate 32 and rising to bottom light electric switch 33 positions, photosignal control electromagnetic valve 18 is turn-offed, and water stops to inject, and closes manually-operated gate 20;

(4) operation T-valve 26, standard measuring device 25 is communicated with the elevated tank 14 in left side, moisturizing is to standard measuring device 25 metering initial liquid levels (can read the orthobaric volume value by scale 24, the volume of this liquid level should have more by about 0.5% surplus of school section volume), and record original volume value;

(5) operation T-valve 26, standard measuring device 25 is communicated with right side low discharge pipeline 19 and large flow pipe road 27, open manually-operated gate 20, opening manually-operated gate 28 then makes bell jar 30 continue to rise with big flow water filling, after waiting to trigger baffle plate 32 and leaving bottom light electric switch 33, solenoid valve 18 is also opened immediately, and this moment, water was by large flow pipe road 27 and 19 water fillings in airtight container 21 simultaneously of low discharge pipeline.When waiting to trigger baffle plate 32 apart from the 1cm left and right sides, top light electric switch 31 position, turn-off manually-operated gate 28, this moment, water only continued to flow in the airtight container 21 by solenoid valve 18, when triggering baffle plate 32 triggering top light electric switches 31, photosignal control electromagnetic valve 18 once more turn-offs, and bell jar 30 stops to rise;

(6) operation T-valve 26 is drained into remaining water in the standard measuring device 25 in the container 16 of weighing, and weighs up surplus quality with electronic scales 17, and by calculating the water volume value of injecting as can be known in the airtight container 21, promptly bell jar is by the volumetric values of the section of demarcation.

(7) open manually-operated gate 23, discharge the water in the airtight container 21, descend with clock mask, the bell jar gas inside is displaced in the airtight container 21, (note: not emptying guarantees that inside and outside gas does not exchange in the airtight container), close it then, so far, finish primary calibration;

Repeat above-mentioned steps (2)～(7), totally six times, until the calibration of finishing to be calibrated section volume.

Claims (5)

1. calibrating reverse stroke of bell-jar volume device, described bell jar (30) and fixing liquid bath (34) constitute the sealed cavity of a variable volume, bell jar (30) internal cavity is connected by the top of pipeline with airtight container (21), it is characterized in that: described airtight container (21) is connected with large flow pipe road (27) endpiece with low discharge pipeline (19) respectively by water injecting pipeline, the inlet end of low discharge pipeline (19) and large flow pipe road (27) all is connected by a mouth of the T-valve (26) on pipeline and standard measuring device (25) bottom, on low discharge pipeline (19), be provided with solenoid valve (18), on large flow pipe road (27), be provided with manually-operated gate (28); Another mouthful of T-valve (26) on the bottom of standard measuring device (25) is connected with elevated tank (14) bottom by pipeline.

2. a kind of calibrating reverse stroke of bell-jar volume device according to claim 1, it is characterized in that: on bell jar (30), be fixed with and trigger baffle plate (32), be provided with two optoelectronic switches in top and bottom (31,33) that are fixed on the liquid bath in bell jar (30) side, when driving, bell jar (30) triggers baffle plate (32) rising, trigger baffle plate (32) and trigger optoelectronic switch generation photosignal, close by photosignal control electromagnetic valve (18).

3. a kind of calibrating reverse stroke of bell-jar volume device according to claim 1 and 2, it is characterized in that: in airtight container (21), be provided with mozzle (22), mozzle (22) top connects with the water injecting pipeline with low discharge pipeline (19) is connected with large flow pipe road (27) endpiece at airtight container (21) top, mozzle (22) bottom extends to airtight container (21) bottom center, apart from bottom 5～10mm.

4. a kind of calibrating reverse stroke of bell-jar volume device according to claim 1 and 2 is characterized in that: described standard measuring device (25) is gone into the formula standard measuring device for amount; Described airtight container (21) and low discharge pipeline (19) and large flow pipe road (27) are the glass transparent material.

5. a kind of calibrating reverse stroke of bell-jar volume device according to claim 1 and 2 is characterized in that: be provided with manually-operated gate (15) on elevated tank (14) outlet at bottom end pipeline; On airtight container (21) and low discharge pipeline (19) and water injecting pipeline that large flow pipe road (27) are connected, be provided with manually-operated gate (20); On airtight container (21) outlet at bottom end pipeline, be provided with manually-operated gate (23); Lead on the inner pipeline of bell jar (30) at airtight container (21) top and to be provided with manually-operated gate (29).