CN220508189U - Gas-liquid temperature self-balancing bell-type gas flow standard test device - Google Patents
Gas-liquid temperature self-balancing bell-type gas flow standard test device Download PDFInfo
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- CN220508189U CN220508189U CN202322210563.0U CN202322210563U CN220508189U CN 220508189 U CN220508189 U CN 220508189U CN 202322210563 U CN202322210563 U CN 202322210563U CN 220508189 U CN220508189 U CN 220508189U
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- 238000005259 measurement Methods 0.000 abstract description 10
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Abstract
The gas-liquid temperature self-balancing bell-type gas flow standard test device comprises a plurality of upright posts, a sealing liquid groove on the inner side of each upright post and a bell-type cover body inverted in the sealing liquid groove, wherein a plurality of guide posts are uniformly distributed on the outer ring of the top of the sealing liquid groove, and corresponding guide wheels are arranged on the top of the bell-type cover body; the air inlet pipeline comprises a fan, an air inlet valve and a heat exchange coil immersed in sealing liquid in the sealing liquid tank according to the air flow direction, the heat exchange coil is connected to an air inlet at the top of the inner container through a pipeline, the air outlet pipeline comprises a test table and an air outlet valve according to the opposite air flow direction, and the air outlet valve is connected to an air outlet at the top of the inner container through a pipeline. The test device automatically balances the temperature of gas and liquid in the bell device, can effectively reduce the temperature difference between the gas and the liquid in the bell and the temperature gradient in the height direction in the bell, greatly shortens the time required by temperature balance, and greatly improves the measurement precision and the working efficiency.
Description
Technical Field
The utility model relates to the technical field of gas flow standard test devices and gas flow meter metering detection, in particular to a gas-liquid temperature self-balancing bell-type gas flow standard test device.
Background
The bell jar type gas flow standard test device is widely used in China at present, and is still used as one of the main equipment for the transmission standard of low-pressure gas flow measurement and the verification of a gas flowmeter. The bell device is operated by using a force balance principle and by using a constant of the weight of the bell exceeding the weight of the counter weight (the constant forms the internal pressure of the bell), the internal pressure of the bell is kept at a constant value by the pressure compensation mechanism, and the internal pressure of the bell does not change with the immersion depth of the bell in the sealing liquid. So it is a gas flow standard device with constant pressure source and standard volume. Due to the factors of processing of various parts in the device, non-uniformity of the device, mechanical friction and the like, the pressure of the device can fluctuate during the working process, which is called pressure fluctuation. The magnitude of its pressure fluctuations is also an aspect of assessing the accuracy of the device. In addition, since the gas is susceptible to the temperature of the sealing liquid and the ambient atmosphere, the constancy of the gas temperature in the cover is also of great importance, and is closely related to the uncertainty of the measurement of the device.
At present, common bell-type gas flow standard devices at home and abroad comprise an upright post, a sealed liquid groove, a bell-type body, a blower, an air inlet pipeline, an air outlet pipeline and the like, and the working principle is as follows: the operating system instructs the blower to start, the bell jar body slowly rises, the blower is closed to stop air inlet when the height is set, the air outlet valve is opened to start detection after a few minutes of stabilization, when the bell jar descends to the set position, the air outlet valve is closed, and the system calculates the indication error of the tested instrument according to a preset mathematical model according to synchronously measured test meter signals, bell jar exhaust quantity, temperature, pressure, time and other parameters. The existing device mainly has the following defects: the blast kinetic energy conversion generates high-temperature gas when the bell jar is in air intake, so that the temperature of sealing liquid in the bell jar is inconsistent with the temperature of gas in the bell jar, and the temperature of the sealing liquid in the bell jar is inconsistent with the temperature of the laboratory environment gas (the larger the temperature difference between the sealing liquid and the gas in the bell jar is, the larger the measurement error generated by the temperature difference is, and the smaller the contrary is). The inconsistency of gas-liquid temperature seriously affects the measurement accuracy, and if waiting for the gas temperature balance, the working efficiency is low.
Disclosure of Invention
According to the gas-liquid temperature self-balancing bell-type gas flow standard test device, the gas and liquid temperatures in the bell-type gas flow standard test device are automatically balanced, and a heat exchanger mechanical component of any heat source is not added, so that the gas-liquid temperature difference in the bell-type gas-liquid temperature and the temperature gradient in the vertical height direction in the bell-type gas-liquid temperature self-balancing bell-type gas flow standard test device can be effectively reduced, the time required for temperature balancing is greatly shortened, and the measurement precision and the working efficiency are greatly improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the gas-liquid temperature self-balancing bell-type gas flow standard test device comprises a plurality of upright posts, a sealing liquid groove on the inner side of each upright post and a bell-type cover body inverted in the sealing liquid groove, wherein a plurality of guide posts are uniformly distributed on the outer ring of the top of the sealing liquid groove, and corresponding guide wheels are arranged on the top of the bell-type cover body; the device also comprises an inner container, an air inlet pipeline and an air outlet pipeline inside the sealed liquid tank, wherein the air inlet pipeline comprises a fan, an air inlet valve and a heat exchange coil immersed in sealing liquid in the sealed liquid tank according to the air flow direction, the heat exchange coil is connected to an air inlet at the top of the inner container through a pipeline, the air outlet pipeline comprises a test table and an air outlet valve according to the opposite air flow direction, and the air outlet valve is connected to an air outlet at the top of the inner container through a pipeline. The bell jar body is used as a volume measurement standard device to ensure the processing roundness and the surface finish. The heat exchange coil is arranged in the sealing liquid, so that the heat exchange between the air inlet gas and the liquid is generated, the temperature difference between the air and the liquid is eliminated, the temperature of the air and the liquid in the bell jar device is automatically balanced, and the time for temperature balance is shortened.
Preferably, a driving wheel is arranged at the top of the upright post, a communicated auxiliary liquid groove is arranged at one side of the sealing liquid groove, the top of the bell jar body is connected with one end of a hauling rope, and the hauling rope penetrates through the other end of the driving wheel and is connected with a liquid level balancing mechanism extending into the auxiliary liquid groove.
Preferably, the liquid level balance mechanism is provided with a bell jar residual pressure adjusting weight.
Preferably, a residual pressure compensation mechanism is arranged on one side of the driving wheel and is connected with a residual pressure compensation heavy hammer through a traction rope.
The pressure compensation mechanism is used for ensuring that the gas pressure is kept unchanged when the bell jar body descends.
Preferably, one side of the auxiliary liquid tank is provided with a communicated liquid level indicating pipe.
Preferably, the upright post is provided with a grating ruler.
Preferably, a temperature sensor I and a pressure sensor I are arranged on a pipeline between the air outlet valve and the tested meter.
Preferably, a temperature sensor II and a pressure sensor II are arranged at the top of the bell jar body.
The temperature and pressure sensors are used for correcting the gas volume and participating in flow calculation, so that the volume measurement is more accurate.
Preferably, the air outlet pipe is provided with a three-way pipe fitting, and the heat exchange coil pipe is connected to the three-way pipe fitting through a pipeline with a valve. The air outlet and the air exhaust in the inner container are combined into the same air path, and the purpose of air-liquid temperature balance can be realized.
Preferably, the device further comprises a PC. The PC is in control connection with the fan, the grating signal and the sensor signal and is provided with an operation interface for controlling and operating the measuring work of the device, and each parameter and relevant original record required by the measurement of the indication error are recorded in real time, so that the detection automation is realized.
The utility model has the advantages that: the test device automatically balances the temperature of gas and liquid in the bell jar device, does not add any heat exchanger mechanical component of a heat source, can effectively reduce the temperature difference of gas and liquid in the bell jar and the temperature gradient in the vertical height direction in the bell jar, greatly shortens the time required by temperature balance, and greatly improves the measurement precision and the working efficiency.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The main reference symbols in the drawings indicate:
1. a guide post; 2. a grating ruler; 3. a bell jar body; 4. sealing the liquid tank; 5. an inner container; 6. an air outlet valve; 7. a temperature sensor I; 8. a pressure sensor I; 9. a test table; 10. a column; 11. an intake valve; 12. a blower; 13. a heat exchange coil; 14. a liquid level indicating tube; 15. an auxiliary liquid tank; 16. a liquid level balancing mechanism; 17. the balance weight of the bell jar is adjusted; 18. a guide wheel; 19. a residual pressure compensation heavy hammer; 20. a temperature sensor II; 21. a pressure sensor II; 22. a driving wheel; 23. a residual pressure compensation mechanism; 24. and a PC.
Detailed Description
In order to more clearly illustrate the utility model, the utility model is further described below with reference to the accompanying drawings.
Embodiment one: as shown in fig. 1, the gas-liquid temperature self-balancing bell-type gas flow standard test device comprises a plurality of upright posts 10, a sealing liquid tank 4 at the inner side of the upright posts 10 and a bell-type cover body 3 inverted in the sealing liquid tank 4, wherein a plurality of guide posts 1 are uniformly distributed on the outer ring at the top of the sealing liquid tank 4, and corresponding guide wheels 18 are arranged at the top of the bell-type cover body 3.
The device further comprises an inner container 5, an air inlet pipeline and an air outlet pipeline inside the sealed liquid tank 4, wherein the air inlet pipeline comprises a fan 12, an air inlet valve 11 and a heat exchange coil 13 immersed in sealing liquid of the sealed liquid tank 4 according to the air flow direction, the heat exchange coil 13 is connected to an air inlet at the top of the inner container 5 through a pipeline, the air outlet pipeline comprises a test table 9 and an air outlet valve 6 according to the air flow opposite direction, and the air outlet valve 6 is connected to an air outlet at the top of the inner container 5 through a pipeline.
Embodiment two: on the basis of the first embodiment, as shown in fig. 1, a driving wheel 22 is arranged at the top of the upright post 10, a communicating auxiliary liquid tank 15 is arranged at one side of the sealed liquid tank 4, the top of the bell jar body 3 is connected with one end of a hauling rope, the hauling rope passes through the other end of the driving wheel 22 and is connected with a liquid level balancing mechanism 16 extending into the auxiliary liquid tank 15, and a bell jar residual pressure adjusting weight 17 is arranged on the liquid level balancing mechanism 16.
The driving wheel 22 is provided with a residual pressure compensation mechanism 23 on one side, and the residual pressure compensation mechanism 23 is connected with the residual pressure compensation heavy hammer 19 through a traction rope.
In addition, a liquid level indicating pipe 14 is arranged on one side of the auxiliary liquid tank 15, and a grating ruler 2 is arranged on the upright post 10.
Embodiment III: on the basis of the first embodiment and the second embodiment, as shown in fig. 1, a temperature sensor i 7 and a pressure sensor i 8 are arranged on a pipeline between the air outlet valve 6 and the test meter 9, and a temperature sensor ii 20 and a pressure sensor ii 21 are arranged on the top of the bell jar 3.
The device also comprises a PC 24, wherein the PC 24 is in control connection with the fan 12, the grating signal and the sensor signal and is provided with an operation interface, so that detection automation is realized.
Embodiment four: the difference with the above embodiment lies in that the air outlet pipe is provided with a three-way pipe fitting, the heat exchange coil 13 is connected to the three-way pipe fitting through a pipeline with a valve, so that the air outlet and the air exhaust in the liner can be combined into the same air path, and the purpose of air-liquid temperature balance can be realized.
The above embodiments are merely examples of the present utility model, but the present utility model is not limited thereto, and the present utility model may be applied to similar products, and any person skilled in the art who is skilled in the field of the present utility model shall make changes or modifications within the scope of the present utility model.
Claims (10)
1. The gas-liquid temperature self-balancing bell-type gas flow standard test device is characterized in that: the device comprises a plurality of upright posts (10), a sealing liquid groove (4) at the inner side of the upright posts (10) and a bell jar cover body (3) which is inversely arranged in the sealing liquid groove (4), wherein a plurality of guide posts (1) are uniformly distributed on the outer ring of the top of the sealing liquid groove (4), and corresponding guide wheels (18) are arranged at the top of the bell jar cover body (3);
the air inlet pipeline comprises a fan (12), an air inlet valve (11) and a heat exchange coil (13) immersed in sealing liquid in the sealing liquid tank (4), wherein the heat exchange coil (13) is connected to an air inlet at the top of the inner container (5) through a pipeline, the air outlet pipeline comprises a test meter (9) and an air outlet valve (6) in the opposite air flow direction, and the air outlet valve (6) is connected to an air outlet at the top of the inner container (5) through a pipeline.
2. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 1, wherein: the top of the upright post (10) is provided with a driving wheel (22), one side of the sealing liquid groove (4) is provided with a communicated auxiliary liquid groove (15), the top of the bell jar body (3) is connected with one end of a traction rope, and the traction rope penetrates through the other end of the driving wheel (22) and is connected with a liquid level balancing mechanism (16) extending into the auxiliary liquid groove (15).
3. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 2, wherein: the liquid level balance mechanism (16) is provided with a bell jar residual pressure adjusting weight (17).
4. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 2, wherein: one side of the driving wheel (22) is provided with a residual pressure compensation mechanism (23), and the residual pressure compensation mechanism (23) is connected with a residual pressure compensation heavy hammer (19) through a traction rope.
5. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 2, wherein: one side of the auxiliary liquid tank (15) is provided with a communicated liquid level indicating pipe (14).
6. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 1, wherein: and a grating ruler (2) is arranged on the upright post (10).
7. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 1, wherein: and a temperature sensor I (7) and a pressure sensor I (8) are arranged on a pipeline between the air outlet valve (6) and the tested meter (9).
8. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 1, wherein: the top of the bell jar body (3) is provided with a temperature sensor II (20) and a pressure sensor II (21).
9. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to claim 1, wherein: the air outlet pipe is provided with a three-way pipe fitting, and the heat exchange coil pipe (13) is connected to the three-way pipe fitting through a pipeline with a valve.
10. The gas-liquid temperature self-balancing bell jar type gas flow standard test device according to any one of claims 1-9, wherein: the device also includes a PC (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322210563.0U CN220508189U (en) | 2023-08-17 | 2023-08-17 | Gas-liquid temperature self-balancing bell-type gas flow standard test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322210563.0U CN220508189U (en) | 2023-08-17 | 2023-08-17 | Gas-liquid temperature self-balancing bell-type gas flow standard test device |
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| Publication Number | Publication Date |
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| CN220508189U true CN220508189U (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322210563.0U Active CN220508189U (en) | 2023-08-17 | 2023-08-17 | Gas-liquid temperature self-balancing bell-type gas flow standard test device |
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| CN (1) | CN220508189U (en) |
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2023
- 2023-08-17 CN CN202322210563.0U patent/CN220508189U/en active Active
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