CN222211863U - Liquid level measuring device with alternating positive and negative pressures - Google Patents
Liquid level measuring device with alternating positive and negative pressures Download PDFInfo
- Publication number
- CN222211863U CN222211863U CN202421052072.6U CN202421052072U CN222211863U CN 222211863 U CN222211863 U CN 222211863U CN 202421052072 U CN202421052072 U CN 202421052072U CN 222211863 U CN222211863 U CN 222211863U
- Authority
- CN
- China
- Prior art keywords
- blowing pipe
- positive
- liquid level
- negative pressure
- positive pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000007664 blowing Methods 0.000 claims abstract description 75
- 238000005259 measurement Methods 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000151 anti-reflux effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to the technical field of liquid level measurement based on a differential pressure transmitter, in particular to a liquid level measurement device with alternating positive and negative pressures, which comprises a differential pressure transmitter, wherein the positive pressure end of the differential pressure transmitter is connected to tested equipment through a positive pressure air blowing pipe, the negative pressure end of the differential pressure transmitter is connected to the tested equipment through a negative pressure air blowing pipe, the positive pressure air blowing pipe stretches into a position below the liquid level of the tested equipment and close to the bottom of the tested equipment, the negative pressure air blowing pipe is connected to a gas phase space at the top of the tested equipment, a backflow prevention device is arranged between the positive pressure air blowing pipe and the tested equipment, and the backflow prevention device is additionally arranged between the positive pressure air blowing pipe and the tested equipment, so that when the positive pressure equipment is measured, a tested object can enter the whole liquid level measurement system through the positive pressure air blowing pipe to cause pipeline blockage, instrument damage and the like.
Description
Technical Field
The utility model relates to the technical field of liquid level measurement based on a differential pressure transmitter, in particular to a liquid level measurement device with alternating positive and negative pressures.
Background
In petrochemical industry or coal chemical industry, a large number of pressure vessels and reaction kettles are applied to the process flow to recover heat generated by the process system. The control of the liquid level of the pressure vessel and the steam drum of the reaction kettle is very critical, for example, if the liquid level is too high, the steam drum can be used for generating steam and damaging downstream equipment, such as a steam turbine, and if the liquid level is too low, the pressure vessel and the reaction kettle can be damaged, even safety accidents occur. The same is true of the drum level of the coal-fired power generation industry. Therefore, the drum level must be accurately controlled to ensure that the drum level fluctuates within a reasonable range.
Although various methods for controlling the liquid level of the drum have been developed to achieve the required measurement effect, in actual measurement, if the blowing pipeline suddenly breaks, when the internal pressure of the positive pressure equipment exceeds the pressure of the blowing pipeline, the measured object enters the whole liquid level measurement system through the positive pressure side sensor, so that the problems of pipeline blockage, instrument damage and the like are caused, and in actual measurement, consideration has to be given to how to avoid the occurrence of the problems, so that a liquid level measurement device with alternating positive and negative pressures is required.
Disclosure of utility model
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a liquid level measuring device with alternating positive and negative pressures, which is used for solving the problem in the prior art that the backflow of the measured object caused by sudden gas interruption during measurement is prevented.
To achieve the above and other related objects, the present utility model provides the following technical solutions:
The liquid level measuring device comprises a differential pressure transmitter, wherein the positive pressure end of the differential pressure transmitter is connected to the tested equipment through a positive pressure air blowing pipe, the negative pressure end of the differential pressure transmitter is connected to the tested equipment through a negative pressure air blowing pipe, the positive pressure air blowing pipe stretches into a position below the liquid level of the tested equipment and close to the bottom of the tested equipment, and the negative pressure air blowing pipe is connected to a gas phase space at the top of the tested equipment;
And a backflow preventing device is arranged between the positive pressure air blowing pipe and the tested equipment.
According to the technical scheme, gas enters the tested equipment through the positive pressure gas blowing pipe at the positive pressure end of the differential pressure transmitter, the positive pressure gas blowing pipe introduces the gas at the gas inlet end below the liquid level of the tested equipment, the gas is close to the bottom of the tested equipment, the negative pressure gas blowing pipe is connected to the gas phase space at the top of the tested equipment, and the liquid level of the tested equipment is measured by utilizing the differential pressure principle.
Through setting up on the malleation gas blowing pipe and being surveyed between the equipment and increased an anti-reflux unit, prevent when measuring malleation equipment, malleation gas blowing pipe suddenly cuts off the gas and malleation equipment's internal pressure when surpassing malleation gas blowing pipe pressure, the measured object can get into whole liquid level measurement system through malleation gas blowing pipe, causes pipeline jam, damage etc..
In an embodiment of the present utility model, an air filter and an air inlet valve are disposed on an air inlet pipe of the input end of the differential pressure transmitter.
According to the technical scheme, the gas filter is arranged to effectively filter the gas at the gas inlet end, so that the cleanliness of the gas is guaranteed, and the gas inlet valve can control the switch of the gas inlet end.
In one embodiment of the present utility model, a positive pressure valve is provided between the differential pressure transmitter and the backflow prevention device.
According to the technical scheme, the positive pressure side valve is arranged to control the air flow switch of the positive pressure air blowing pipe.
In an embodiment of the utility model, a negative pressure valve is disposed on the negative pressure air blowing pipe.
The technical scheme is realized, and the negative pressure side valve is used for independently controlling the air flow switch of the negative pressure air blowing pipe.
In an embodiment of the present utility model, the positive pressure air blowing pipe and the negative pressure air blowing pipe are respectively provided with a positive pressure dredging device and a negative pressure dredging device which are communicated with the outside.
The technical scheme is realized, and the positive pressure dredging device and the negative pressure dredging device are utilized, so that the cleaning and dredging of the positive pressure air blowing pipe and the negative pressure air blowing pipe can be facilitated.
In an embodiment of the utility model, a positive pressure sensor is disposed between the backflow preventing device and the tested device.
The technical scheme is realized, and the airflow passing condition of the positive pressure end is sensed.
In one embodiment of the utility model, the differential pressure transmitter is connected to the positive pressure insufflation tube and the negative pressure insufflation tube by a constant flow device.
The technical scheme is realized, and the stability of gas delivery is ensured.
As described above, the liquid level measuring device with alternating positive and negative pressures has the advantages that gas enters the tested equipment through the positive pressure gas blowing pipe at the positive pressure end of the differential pressure transmitter, the positive pressure gas blowing pipe introduces the gas at the gas inlet end below the liquid level of the tested equipment and near the bottom of the tested equipment, the negative pressure gas blowing pipe is connected to the gas phase space at the top of the tested equipment, the liquid level of the tested equipment is measured by utilizing the differential pressure principle, and a backflow preventing device is additionally arranged between the positive pressure gas blowing pipe and the tested equipment, so that when the positive pressure equipment is measured, the positive pressure gas blowing pipe suddenly breaks, and when the internal pressure of the positive pressure equipment exceeds the pressure of the positive pressure gas blowing pipe, a tested object can enter the whole liquid level measuring system through the positive pressure gas blowing pipe, and the pipeline is blocked, the instrument is damaged and the like.
Drawings
Fig. 1 is a schematic structural diagram of a liquid level measuring device with alternating positive and negative pressures disclosed in an embodiment of the utility model.
Description of element reference numerals
1. The device comprises a differential pressure transmitter, a positive pressure air blowing pipe, a negative pressure air blowing pipe, a device to be tested, a backflow preventing device, a gas filter, a 7, an air inlet valve, a 8, a positive pressure side valve, a 9, a negative pressure side valve, a 10, a positive pressure dredging device, a 11, a negative pressure dredging device, a 12, a positive pressure side sensor, a 13, a constant flow device, a 14 and an air inlet pipeline.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Referring to fig. 1, the utility model provides a liquid level measuring device with alternating positive and negative pressures, which comprises a differential pressure transmitter 1, wherein the positive pressure end of the differential pressure transmitter 1 is connected to a tested device 4 through a positive pressure air blowing pipe 2, the negative pressure end of the differential pressure transmitter 1 is connected to the tested device 4 through a negative pressure air blowing pipe 3, the positive pressure air blowing pipe 2 stretches into a position below the liquid level of the tested device 4 and near the bottom of the tested device 4, the negative pressure air blowing pipe 3 is connected to a gas phase space at the top of the tested device 4, and an anti-backflow device 5 is arranged between the positive pressure air blowing pipe 2 and the tested device 4.
The gas enters the tested device 4 through the positive pressure gas blowing pipe 2 at the positive pressure end of the differential pressure transmitter 1, the positive pressure gas blowing pipe 2 introduces the gas at the gas inlet end below the liquid level of the tested device 4, and is close to the bottom of the tested device 4, the negative pressure gas blowing pipe 3 is connected to the gas phase space at the top of the tested device 4, and the liquid level of the tested device 4 is measured by utilizing the differential pressure principle.
Through setting up on positive pressure gas-blowing pipe 2 and being surveyed device 4 between increasing a backflow preventer 5, prevent when measuring positive pressure equipment that positive pressure gas-blowing pipe 2 from breaking off suddenly and positive pressure equipment's internal pressure exceeds positive pressure gas-blowing pipe 2 pressure, the measured object can get into whole liquid level measurement system through positive pressure gas-blowing pipe 2, causes pipeline jam, damage etc..
Be equipped with gas filter 6 and admission valve 7 on the air inlet line 14 of differential pressure transmitter 1 input, carry out effective filtration through setting up gas filter 6 to the gas of air inlet, guarantee gaseous cleanliness, admission valve 7 can control the switch of air inlet, be equipped with positive pressure side valve 8 between differential pressure transmitter 1 and the anti-return device 5, positive pressure side valve 8's setting can control the air current switch of positive pressure gas-blowing pipe 2.
The negative pressure air blowing pipe 3 is provided with a negative pressure side valve 9, the negative pressure side valve 9 is used for independently controlling the airflow switch of the negative pressure air blowing pipe 3, the positive pressure air blowing pipe 2 and the negative pressure air blowing pipe 3 are respectively provided with a positive pressure dredging device 10 and a negative pressure dredging device 11 which are communicated with the outside, and the positive pressure dredging device 10 and the negative pressure dredging device 11 are utilized to facilitate the subsequent cleaning and dredging of the positive pressure air blowing pipe 2 and the negative pressure air blowing pipe 3.
A positive pressure side sensor 12 is arranged between the backflow prevention device 5 and the tested device 4, the airflow passing condition of a positive pressure end is sensed, and the differential pressure transmitter 1 is connected to the positive pressure air blowing pipe 2 and the negative pressure air blowing pipe 3 through a constant flow device 13, so that the stability of gas conveying is ensured.
The utility model has the advantages that gas enters the tested equipment through the positive pressure gas blowing pipe at the positive pressure end of the differential pressure transmitter, the positive pressure gas blowing pipe introduces the gas at the gas inlet end below the liquid level of the tested equipment and is close to the bottom of the tested equipment, the negative pressure gas blowing pipe is connected to the gas phase space at the top of the tested equipment, the liquid level of the tested equipment is measured by utilizing the differential pressure principle, and a backflow prevention device is additionally arranged between the positive pressure gas blowing pipe and the tested equipment, so that the phenomenon that when the positive pressure equipment is measured, the positive pressure gas blowing pipe suddenly breaks off, and the internal pressure of the positive pressure equipment exceeds the pressure of the positive pressure gas blowing pipe is prevented, and a tested object enters the whole liquid level measurement system through the positive pressure gas blowing pipe, thereby causing pipeline blockage, instrument damage and the like.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. It is intended that all equivalent modifications and variations of the utility model be covered by the claims of this utility model be accomplished by those of ordinary skill in the art without departing from the spirit and scope of the utility model as disclosed herein.
Claims (7)
1. The utility model provides a liquid level measurement device that positive negative pressure is in turn, includes differential pressure transmitter, differential pressure transmitter's positive pressure end is connected to the equipment of being surveyed through positive pressure gas blowing pipe, differential pressure transmitter's negative pressure end is connected to the equipment of being surveyed through negative pressure gas blowing pipe, its characterized in that:
The positive pressure air blowing pipe stretches into a position below the liquid level of the tested equipment and close to the bottom of the tested equipment, and the negative pressure air blowing pipe is connected to a gas phase space at the top of the tested equipment;
And a backflow preventing device is arranged between the positive pressure air blowing pipe and the tested equipment.
2. The positive and negative pressure alternating liquid level measuring device according to claim 1, wherein a gas filter and a gas inlet valve are arranged on a gas inlet pipeline of the input end of the differential pressure transmitter.
3. The positive and negative pressure alternating liquid level measuring device according to claim 1, wherein a positive pressure side valve is arranged between the differential pressure transmitter and the backflow preventing device.
4. The positive-negative pressure alternating liquid level measuring device according to claim 1, wherein the negative pressure air blowing pipe is provided with a negative pressure side valve.
5. The positive and negative pressure alternating liquid level measuring device according to claim 1, wherein the positive pressure blowing pipe and the negative pressure blowing pipe are respectively provided with a positive pressure dredging device and a negative pressure dredging device which are communicated with the outside.
6. The positive-negative pressure alternating liquid level measuring device according to claim 1, wherein a positive pressure side sensor is arranged between the backflow preventing device and the tested equipment.
7. The apparatus of claim 1, wherein the differential pressure transmitter is connected to the positive pressure gas-blowing pipe and the negative pressure gas-blowing pipe via constant flow devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421052072.6U CN222211863U (en) | 2024-05-15 | 2024-05-15 | Liquid level measuring device with alternating positive and negative pressures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421052072.6U CN222211863U (en) | 2024-05-15 | 2024-05-15 | Liquid level measuring device with alternating positive and negative pressures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222211863U true CN222211863U (en) | 2024-12-20 |
Family
ID=93862738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421052072.6U Active CN222211863U (en) | 2024-05-15 | 2024-05-15 | Liquid level measuring device with alternating positive and negative pressures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222211863U (en) |
-
2024
- 2024-05-15 CN CN202421052072.6U patent/CN222211863U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2575975B2 (en) | Filtration device | |
| JP6126596B2 (en) | Seal gas monitoring and control system | |
| US4012944A (en) | Electronic fluid pipeline leak detector and method | |
| US4144743A (en) | Electronic fluid pipeline leak detector and method | |
| CN204612758U (en) | For the analog quantity measuring point monitoring equipment of fired power generating unit | |
| CN222211863U (en) | Liquid level measuring device with alternating positive and negative pressures | |
| KR940015483A (en) | Piping Block Detection Device | |
| CN202942717U (en) | Mechanical filter with detection device | |
| CN113154264A (en) | Safety monitoring system for semiconductor waste gas treatment equipment | |
| KR101403614B1 (en) | Gas and liquid seperating system | |
| CN204330069U (en) | A kind of air cooling tower liquid level detection device | |
| CN204228228U (en) | Cork dry quenching disposable dust remover material-level detecting device | |
| CN206291942U (en) | A kind of blowing type liquid level meter | |
| CN204556193U (en) | A kind of woven hose inwall pick-up unit | |
| CN211085374U (en) | Differential pressure type flowmeter with anti-blocking device | |
| CN208998110U (en) | Gas pipeline and gas fired-boiler | |
| CN107060913A (en) | A kind of unattended automatic hydrophobic system | |
| CN209607120U (en) | A kind of pipe leakage visualizing monitor warning device | |
| CN109971522A (en) | A station desulfurization device for low-sulfur natural gas | |
| CN207131454U (en) | A kind of unattended automatic hydrophobic system | |
| CN107559601A (en) | A kind of plastic pipe inner wall detection means | |
| CN220151516U (en) | Pump operation early warning safety system | |
| CN208805315U (en) | A kind of intelligent gas membranous system for pressure gauge measurement | |
| CN205229124U (en) | System for be used for improving combustion engine hazardous gas detecting reliability | |
| CN222167473U (en) | An economical, safe and reliable liquid level control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |