Bell jar volume segmentation calibration positioning device

Abstract

The utility model discloses a bell jar volume segmentation calibration positioning device. The top of a bell jar body is provided with a photoelectric pulse pinger, a bell jar guide column is arranged above the side part of the bell jar body, a positioning branch pipe is fixed on the bell jar guide column through a pipe clamp, a standard scribed line ruler is fixed on the positioning branch pipe, and a shading timing plate is fixed on the standard scribed line ruler; and the photoelectric pulse signal transmitter corresponds to the shading timing plate and is electrically connected with the control center. According to the utility model, synchronous acquisition, analysis and calculation of bell jar segmented volume constant value positioning can be automatically completed, accurate bell jar segmented volume values can be automatically obtained, the requirements of relevant national metrological verification regulations are met, the requirements of a large-scale bell jar type gas flow standard device on segmented verification of each flow point of a gas flowmeter are met, and the operation is simple and convenient. The system has the advantages of high automation degree, accurate synchronous positioning, stable signaling performance, small measurement error, good repeatability, safe and reliable use and the like.

Description

Technical Field

[0001] The utility model relates to the field of instruments and meters, in particular to a capacity verification device, more particularly to a bell-shaped gas flow standard device. Background Art

[0002] The bell jar is the main equipment for calibrating gas flow transfer standards and gas flow meters, and has been widely used at home and abroad. The working pressure of this device is generally less than 10000Pa, and the maximum flow rate is determined by the volume of the bell jar and the testing technology. At present, the bell jar volume of domestically standardized products has a variety of specifications between (10~10000)L, and the maximum flow rate can be measured up to 45000m 3 / h, the accuracy of the device is generally better than 0.5 level, and can reach 0.1 level at most. In order to ensure that large bell jars of 500L and above meet the accuracy requirements, in addition to ensuring the geometric processing accuracy of the bell jar body and the accuracy of the bell jar body displacement measurement, it is also necessary to calibrate the standard volume of the bell jar in sections and perform precise positioning of electronic signals.

[0003] At present, domestic bell jars generally use rotary encoders to detect the volume position of the bell jar, which has problems such as poor measurement repeatability and synchronous lifting position offset. Its form is single and the error is large, which seriously affects the uncertainty and repeatability of the segmented volume of the bell-type gas flow standard device. It is impossible to accurately measure the segmented standard volume of large bell-type gas flow standard devices, reducing the market competitiveness of the product. Utility Model Content

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a bell jar volume segmented calibration and positioning device, which divides the standard volume of the bell jar into a plurality of fixed volume segments, measures the accuracy of each segmented volume respectively, and takes the maximum uncertainty in each segment volume as the uncertainty of the bell jar volume through comparative analysis.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A bell jar volume segment calibration and positioning device, a photoelectric pulse transmitter is arranged on the top of the bell jar body, a bell jar guide column is arranged on the upper side of the bell jar body, a positioning branch pipe is fixed on the bell jar guide column through a pipe clamp, a standard scale is fixed on the positioning branch pipe, and a light-shielding timing board is fixed on the standard scale; the photoelectric pulse transmitter corresponds to the light-shielding timing board, and the photoelectric pulse transmitter is electrically connected to a control center.

[0007] A transmitter positioning plate is arranged on the top of the bell housing, and a mounting groove is arranged on the transmitter positioning plate, in which the photoelectric pulse transmitter is fixed, and the mounting groove is a long groove.

[0008] There are multiple light-shielding timing boards, which are respectively fixed at 100L, 200L, 500L, 1000L and 2000L of the standard scale.

[0009] Photoelectric pulse transmitter and light shielding timing board are used as pulse signal triggering devices for segmented volume. Photoelectric pulse transmitter is fixed on the upper part of bell cover, and light shielding timing board is fixed on standard scale. When bell cover is rising, photoelectric pulse transmitter rises synchronously, and light shielding timing board outputs pulse signal synchronously after positioning one by one. Control center synchronously collects pulse signal, thus determining different segmented volume values.

[0010] The standard volume of the bell-shaped gas flow standard device can be divided into multiple fixed volume segments, and the accuracy of each segment volume is measured respectively. Through comparative analysis, the largest uncertainty in each segment volume is taken as the uncertainty of the bell volume. The segment volume is determined by fixed value positioning after verification, and basically has segment volumes of 100L, 200L, 500L, 1000L, 2000L, etc.

[0011] The measurement inaccuracy of the bell-jar volume segmented calibration and positioning device is 0.05%, the measurement repeatability is 0.1%, and the synchronous lifting position offset error is ±0.5mm, which can cover the segmented volume calibration requirements of the bell-jar type gas flow standard device in the range of (500~10000)L.

[0012] The utility model has the following beneficial effects and advantages:

[0013] 1. The utility model can be widely used to calibrate the standard volume of large bell jars of 500L and above in sections, and perform synchronous and precise positioning of electronic signals. Through synchronous acquisition by the control center, accurate section volumes can be obtained, thereby ensuring the standard volume and repeatability of the bell jars, and meeting the requirements of relevant national metrological verification regulations.

[0014] 2. The measurement inaccuracy of the utility model is 0.05%, the measurement repeatability is 0.1%, and the synchronous lifting position offset error is ±0.5mm, covering the segmented volume calibration requirements of various bell jars within the range of (500~10000)L.

[0015] 3. The process structure of the utility model is composed of a bell housing, a photoelectric pulse transmitter, a pipe clamp, a bell guide column, a light-shielding timing board, a positioning branch pipe, a standard scale, etc. It has the advantages of simple structure, convenient maintenance, and long service life.

[0016] 4. The utility model can divide the standard volume of the bell-shaped gas flow standard device into a plurality of fixed volume sections, respectively measure the accuracy of the volume of each section, and through comparative analysis, take the maximum uncertainty in the volume of each section as the uncertainty of the bell-shaped volume.

[0017] 5. The utility model adopts a photoelectric pulse transmitter and a light shielding timing board as the pulse signal triggering device of the segmented volume. The photoelectric pulse transmitter is fixed on the upper part of the bell cover, and the light shielding timing board is fixed on the standard scale. When the bell cover is rising, the photoelectric pulse transmitter rises synchronously, and the light shielding timing board outputs pulse signals synchronously after passing through the positioned light shielding timing board one by one. The control center synchronously collects the pulse signals, thereby determining different segmented volume values.

[0018] 6. The utility model has the advantages of high automation, accurate synchronous positioning, stable signal transmission performance, small measurement error, good repeatability, safe and reliable use, etc. It can realize accurate calibration of the segmented volume of the bell-type gas flow standard device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the bell jar volume segment calibration and positioning device of the utility model;

[0020] Figure 2 for Figure 1 A partial top view of

[0021] Among them, 1 is the bell housing, 2 is the photoelectric pulse transmitter, 21 is the transmitter positioning plate, 22 is the installation groove, 3 is the pipe clamp, 4 is the bell guide column, 5 is the light-shielding timing board, 6 is the positioning branch pipe, 7 is the standard scale, and 8 is the control center. DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0023] like Figures 1-2 As shown, the utility model is a bell jar volume segment calibration and positioning device, comprising a bell jar body 1, a photoelectric pulse transmitter 2, a pipe clamp 3, a bell jar guide column 4, a light shielding timing board 5, a positioning branch pipe 6, a standard scale 7 and a control center 8.

[0024] The photoelectric pulse transmitter 2 is installed on the top of the bell housing 1 and can be adjusted to move forward and backward; the light-shielding timing board 5 is installed on the standard scale 7; the standard scale 7 is installed on the positioning branch pipe 6; the positioning branch pipe 6 is fixed on the bell guide column 4 by connecting with the pipe clamp 3.

[0025] The utility model adopts a photoelectric pulse transmitter 2 and a shading timing board 5 as a pulse signal triggering device for segmented volume. During the lifting process of the bell jar body 1, the photoelectric pulse transmitter 2 is lifted and lowered synchronously, and passes through the positioned shading timing board 5 one by one. The light-transmitting holes of the photoelectric pulse transmitter 2 are shielded and then pulse signals are output. The control center 8 synchronously collects the pulse signals, and determines different segmented volume values ​​according to different positions of the triggered shading timing board 5. The segmented volume values ​​are basically set to 100L, 200L, 500L, 1000L, 2000L and the like.

[0026] The photoelectric pulse transmitter 2 is an open photoelectric signal conversion device with an opening slot width of 10mm, a light-transmitting hole diameter of 1.5mm, an operating frequency of (3-20)kHz, a minimum response time of 0.001s, and an operating voltage of DC (6-36)V.

[0027] The light shielding timing board 5 is made of stainless steel plate with a thickness of not less than 2mm, and the effective length of the light shielding section is 10mm. It can be triggered on the rising edge or the falling edge. The light shielding timing board 5 is fixed on the standard scale 7. Five light shielding timing boards are provided according to the specific value of the segmented volume of the bell jar. The installation position corresponds to the scale position of the standard scale 7 of the segmented volume after the bell jar is calibrated, and the installation size deviation is ±0.5mm.

[0028] The control center 8 of the utility model can adopt a single chip microcomputer, such as a commercially available Siemens product. After the system is started, the device data is displayed in real time through the human-machine interface, so that the operator can see the operating status of the device at a glance, and can automatically complete the synchronous collection, analysis and calculation of the fixed position of the bell jar segment volume, and automatically obtain the accurate bell jar segment volume.

[0029] The principle of this utility model is as follows:

[0030] When working, first install the photoelectric pulse transmitter 2 on the top of the bell housing 1, and move the photoelectric pulse transmitter 2 back and forth in the installation slot to adjust it to a suitable position to ensure that its light-transmitting hole is located at the light-shielding section of the light-shielding timing plate 5. The bell housing 1 is blown up by compressed air, driving the photoelectric pulse transmitter 2 to rise synchronously. When passing the 100L light-shielding timing plate 5, the rising edge is triggered and a pulse signal is output. The control center 8 receives the signal and determines and records that the light-shielding point is the 100L segmented volume position; the bell housing 1 continues to rise, and when passing the 200L light-shielding timing plate 5, the rising edge is triggered and a pulse signal is output. The control center 8 receives the signal and determines and records that the light-shielding point is the 200L segmented volume position. Repeat the above operation to obtain the segmented volume positions of the bell housing 500L, 1000L, and 2000L. The calibration starts after the bell jar body 1 rises to the highest position and stabilizes for 5 minutes. The bell jar body 1 descends, driving the photoelectric pulse transmitter 2 to descend synchronously. When it passes the positioned shading timing board 5 one by one, the falling edge is triggered and a pulse signal is output. The control center 8 receives the signal again to judge and calculate the segmented volume value. Each segmented volume needs to be calibrated repeatedly 6 times, and the accurate calibration position of each segmented volume and the shading timing board 5 is determined one by one, thereby ensuring the accuracy of the measurement of the lifting and lowering displacement of the bell jar body 1.

[0031] The main technical indicators of this utility model are as follows:

[0032] 1. Test bell range: (500~10000)L

[0033] 2. Measurement inaccuracy: 0.05%.

[0034] 3. Measurement repeatability: 0.1%.

[0035] 4. The segmented volume setting method of the bell jar: positioning at any volume value.

[0036] 5.Signal output mode: pulse signal.

[0037] 6. Photoelectric pulse transmitter: operating frequency (3~20) kHz, minimum response time 0.001s, shading section 1mm.

[0038] 7. Timer: Crystal oscillator 8h stability ≤1×10 -6 , frequency stability ±1×10 -6 , the minimum reading value of the timer is 0.001s.

[0039] 8. Standard environmental conditions: temperature 20℃±0.2℃, atmospheric pressure 101.3kPa, relative humidity (15~90)%RH.

Claims

1. A bell jar volume segment calibration and positioning device, characterized in that: A photoelectric pulse transmitter is arranged on the top of the bell jar body, a bell jar guide column is arranged on the upper side of the bell jar body, a positioning branch pipe is fixed on the bell jar guide column through a pipe clamp, a standard scale is fixed on the positioning branch pipe, and a shading timing board is fixed on the standard scale; the photoelectric pulse transmitter corresponds to the shading timing board, and the photoelectric pulse transmitter is electrically connected to the control center.

2. The bell jar volume segment calibration and positioning device according to claim 1, characterized in that: A transmitter positioning plate is arranged on the top of the bell housing, and a mounting groove is arranged on the transmitter positioning plate. The photoelectric pulse transmitter is fixed in the mounting groove, and the mounting groove is a long groove.

3. The bell jar volume segment calibration and positioning device according to claim 1, characterized in that: There are multiple light-shielding timing boards, which are respectively fixed at 100L, 200L, 500L, 1000L and 2000L of the standard scale.

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