CN217385323U

CN217385323U - Calibration system for calibrating photoionization detectors in batches

Info

Publication number: CN217385323U
Application number: CN202220656873.8U
Authority: CN
Inventors: 姬红波; 李志刚; 姬二鹤
Original assignee: Huadian Intelligent Control Beijing Technology Co ltd
Current assignee: Huadian Intelligent Control Beijing Technology Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-09-06
Anticipated expiration: 2032-03-23

Abstract

The utility model relates to a gaseous detection technology field provides a calibration system for calibrating photoionization detector in batches, include: the system comprises an acquisition unit, a main control unit and a plurality of photoionization detector modules; the photoionization detector modules are provided with air inlets and air outlets, and a plurality of photoionization detector modules are sequentially connected in series through the air inlets and the air outlets to form a detection air path; the photoionization detector module and the main control unit are respectively and electrically connected with the acquisition unit, and the acquisition unit is used for acquiring a detection signal of the photoionization detector module and sending the detection signal to the main control unit. The calibration system for calibrating the photoionization detectors in batches can guarantee that the air input of each photoionization detector module is consistent when batch testing is realized, so that the consistency of the performance of a plurality of photoionization detector modules is judged, and the atmospheric environment is prevented from being polluted due to the overflow of a large amount of standard gas.

Description

Calibration system for calibrating photoionization detectors in batches

Technical Field

The utility model relates to a gaseous detection technology field especially relates to a calibration system for calibrating photoionization detector in batches.

Background

Photoionization detectors (PID detectors for short) are widely used in the fields of environmental pollution detection, occupational health, disease prevention, and the like. The detection of Total Volatile Organic Compounds (TVOC for short) in some petrochemical plants has begun to adopt the PID technology instead of the catalytic detection technology, and has been widely applied. For example, PID detectors are installed near process equipment and pipelines to monitor gas leakage caused by unexpected faults in the production process in real time, control of environmental air pollution is realized, and alarm devices are started according to restrictions to monitor the operating conditions of the production equipment. The detection data of the PID detector can also be used as a device diagnosis tool for analyzing the running condition of the device, assisting in investigating problems in the production process and providing reference data for rapidly eliminating faults.

The current PID detector needs to be tested in a laboratory environment before leaving a factory, so that the aging and calibration of the PID detector are realized, and the operation stability and the measurement accuracy of the sensor are ensured. However, in the related art, when the PID detector is tested, the test data cannot be rapidly and effectively recorded and the performance of the sensor can not be judged, the PID detector needs to be tested one by one, so that a lot of repeated work exists, the test efficiency is low, and a large amount of standard gas overflows to cause great environmental pollution.

SUMMERY OF THE UTILITY MODEL

The utility model provides a calibration system for calibrating photoionization detector in batches for the efficiency of software testing to photoionization detector is low among the solution prior art, and has a large amount of standard gas to spill over the problem that causes great environmental pollution.

The utility model provides a calibration system for be used for calibrating photoionization detector in batches, include: the system comprises an acquisition unit, a main control unit and a plurality of photoionization detector modules;

the photoionization detector modules are provided with air inlets and air outlets, and a plurality of photoionization detector modules are sequentially connected in series through the air inlets and the air outlets to form a detection air path;

the photoionization detector module and the main control unit are respectively and electrically connected with the acquisition unit, and the acquisition unit is used for acquiring a detection signal of the photoionization detector module and sending the detection signal to the main control unit.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches, photoionization detector module includes casing and photoionization detector, photoionization detector encapsulate in the casing, photoionization detector with be formed with the detection air chamber between the casing, the air inlet with the gas vent respectively with it is linked together to detect the air chamber.

According to the utility model provides a calibration system for calibrating photoionization detector in batches, the detection air chamber is located below the photoionization detector; and/or the air inlet and the air outlet are coaxially arranged.

According to the utility model provides a pair of a calibration system for standardizing photoionization detector in batches still includes the box, the box is equipped with main gas entry and main gas outlet, and is a plurality of photoionization detection module series connection in proper order in main gas entry with between the main gas outlet.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches, the casing includes first casing and second casing, first casing with be formed with the cavity between the second casing, photoionization detector demountable installation in the cavity, first casing with the connection can be dismantled to the second casing.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches, photoionization detector module still includes the sealing washer, the sealing washer set up in photoionization detector with between the inside wall of first casing.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches still includes the filter unit, the filter unit with the gas vent is linked together.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches, the filter unit includes a jar body and active carbon, the active carbon accept in the jar is internal, the jar body is equipped with entry and export, the entry links to each other with the gas vent.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches still includes the air feed unit, the air feed unit includes air bottle and mark gas bottle, the air bottle with mark gas bottle respectively with the air inlet is linked together, the air bottle with mark gas bottle with all be equipped with the solenoid valve on the communicating pipe way of air inlet, the solenoid valve with main control unit communication connection.

According to the utility model provides a pair of a calibration system for calibrating photoionization detector in batches still includes box and fender bracket, the acquisition unit photoionization detector module with the main control unit is located in the box, the fender bracket connect in the outside of box, the air bottle with the mark gas bottle is located on the fender bracket.

The utility model provides a calibration system for calibrating photoionization detector in batches through will need carry out a plurality of photoionization detector modules that age in batches or mark and establish ties on a gas circuit, realizes the air supply sharing. The method not only can realize rapid and effective recording of test data in batch test to judge the performance quality of the detector, but also can ensure the air inflow of each photoionization detector module to be consistent, thereby being capable of judging the performance consistency of a plurality of photoionization detector modules according to detection signals of the photoionization detector modules. Compared with the method for testing a plurality of photoionization detectors one by one, the method can avoid the pollution to the atmospheric environment caused by the overflow of a large amount of standard gas.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a block diagram of a calibration system for batch calibration of photoionization detectors provided by the present invention;

fig. 2 is a schematic structural diagram of a calibration system for batch calibration of photoionization detectors according to the present invention;

fig. 3 is a schematic structural diagram of a photoionization detector module in a calibration system for batch calibration of photoionization detectors according to the present invention;

reference numerals:

1. a collection unit; 2. a main control unit; 3. a photoionization detector module; 31. a housing; 301. a first housing; 3011. a limiting surface; 302. a second housing; 311. an air inlet; 312. an exhaust port; 313. detecting the air chamber; 32. a photoionization detector; 33. a seal ring; 4. a box body; 41. a main gas inlet; 42. a main gas outlet; 5. a filtration unit; 6. an air supply unit; 61. an air bottle; 62. a standard gas bottle; 631. a first solenoid valve; 632. a second solenoid valve; 7. a protection frame; 8. a power supply unit.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "first" and "second" are used for clearly indicating the numbering of the product parts and do not represent any substantial difference unless explicitly stated or limited otherwise. The directions of "up" and "down" are all based on the directions shown in the drawings. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations. Further, "a plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The calibration system for batch calibration of photoionization detectors of the present invention will now be described with reference to fig. 1 to 3.

Fig. 1 is a block diagram illustrating a calibration system for batch calibration of photoionization detectors according to the present invention. The calibration system for calibrating the photoionization detectors in batches comprises an acquisition unit 1, a main control unit 2 and a plurality of photoionization detector modules 3. Fig. 3 is a schematic structural diagram of a photoionization detector module in a calibration system for batch calibration of photoionization detectors according to the present invention. The photoionization detector module 3 is provided with an inlet 311 and an outlet 312. A plurality of photoionization detector modules 3 are connected in series in sequence through an inlet 311 and an outlet 312 to form a detection air path. The photoionization detector 32 and the main control unit 2 are electrically connected to the acquisition unit 1, respectively. The acquisition unit 1 is used for acquiring a detection signal of the photoionization detector 32 and transmitting the detection signal to the main control unit 2.

The plurality of photoionization detector modules 3 are photoionization detector modules 3 which need to be aged and calibrated in batches. A photo-ionization detector 32 is provided in each photo-ionization detector module 3, and gas entering the photo-ionization detector module 3 through the gas inlet 311 can be discharged through the gas outlet 312 after coming into contact with the probes of the photo-ionization detector 32. The gas entering the photoionization detector module 3 is ionized into positive and negative ions under the action of an ultraviolet lamp of the photoionization detector 32, and the ions are shifted to form weak current under the action of an external electric field to form a detection signal.

The photo-ionization detector 32 in each photo-ionization detector module 3 is connected to the acquisition unit 1 by a signal line. The acquisition unit 1 acquires a detection signal of the photoionization detector 32 and transmits the detection signal to the main control unit 2. The main control unit 2 acquires and records the detection signal. The main control unit 2 can perform aging and calibration of the photo-ionization detector 32 according to a set control logic.

The photoionization detector module 3 is provided with a detection air chamber 313, and the air inlet 311 and the air outlet 312 are respectively communicated with the detection air chamber 313. The plurality of photoionization detector modules 3 being connected in series means that the detection cells 313 of the plurality of photoionization detector modules 3 are in series communication.

At present, when the photoionization detector is tested, the photoionization detector is aged and calibrated in a laboratory environment before leaving a factory, and the purpose of sufficient aging cannot be achieved due to the fact that gas components in the laboratory environment easily interfere with the PID detector, so that the photoionization detector can drift in the actual operation process. After the PID detector is integrated into the device, the residual volatile in the device is also liable to cause deviation of the calibration measurement result of the whole device.

The embodiment of the utility model provides a be linked together through the detection air chamber 313 with a plurality of photoionization detector module 3, can realize the sharing of a plurality of photoionization detector module 3 air supplies, avoid laboratory environment or equipment to remain the influence of volatile substance to the test accuracy.

When the photoionization detector 32 is aged before leaving the factory, clean air is introduced into the photoionization detector module 3 through the air inlet 311 for a certain time, and then aging is completed. When the photoionization detector 32 is calibrated, clean air and standard gas are sequentially introduced into the photoionization detector module 3 through the air inlet 311 according to a set program to complete calibration.

The embodiment of the utility model provides a calibration system for calibrating photoionization detector in batches, through will need carry out a plurality of photoionization detector modules 3 that age or mark in batches and establish ties on a gas circuit, realize the air supply sharing. The test data can be rapidly and effectively recorded to judge the performance quality of the detector during batch test, and the air inflow of each photoionization detector module 3 can be ensured to be consistent, so that the consistency of the performance of the photoionization detector modules 3 can be judged according to the detection signals of the photoionization detector modules 3. Compared with the method for testing a plurality of photoionization detectors 32 one by one, the pollution to the atmospheric environment caused by the overflow of a large amount of standard gas can be avoided. Fig. 2 is a schematic structural diagram of a calibration system for batch calibration of photoionization detectors according to the present invention.

In some embodiments, the photoionization detector module 3 includes a housing 31 and a photoionization detector 32. The photo ionization detector 32 is enclosed within the housing 31. A detection air chamber 313 is formed between the photoionization detector 32 and the housing 31. The intake port 311 and the exhaust port 312 communicate with the detection chamber 313, respectively.

Before shipping the photoionization detector 32, the photoionization detector 32 is packaged in the case 31 to form the photoionization detector module 3. The detection air chambers 313 of the multiple photoionization detector modules 3 are communicated in series to form a detection air path. And in the aging and calibration processes, clean air or standard gas is introduced into the detection gas circuit to realize the test of the photoionization detector.

In practical applications, the photoionization detector module 3 may be directly integrated with the device, and may be aged or calibrated on the device. Alternatively, the photoionization detector module 3 is aged or calibrated outside the device.

The embodiment of the utility model provides a calibration system for calibrating photoionization detector in batches still includes box 4. As shown in fig. 2, the tank 4 is provided with a main gas inlet 41 and a main gas outlet 42. A plurality of photo-ionisation detector modules 3 are connected in series between the main gas inlet 41 and the main gas outlet 42.

Wherein the housing 4 is used for integrating the photo ionization detector module 3. The main gas inlet 41 is used for connecting the gas supply unit 6, and a connecting pipeline is arranged in the box body 4. When the detection and installation are carried out, a plurality of photoionization detector modules 3 are connected in series through connecting pipelines to form a detection air path. For example, the connecting line is a polytetrafluoroethylene tube.

Standard gas or clean air enters the detection gas chamber 313 of each photoionization detector module 3 from the main gas inlet 41 of the tank 4 and is then discharged out of the tank 4 through the main gas outlet 42. When the photoionization detector module 3 is integrated into a device for testing, the components of the device on which the photoionization detector module 3 is mounted serve as the tank 4. When testing the photo-ionization detector module 3 off-site, a separate cabinet 4 may be provided off-site, with the photo-ionization detector module 3 being tested in series between the primary gas inlet 41 and the primary gas outlet 42 of the cabinet 4.

In some embodiments, the detection chamber 313 is located below the photoionization detector 32. When the photoionization detector 32 is subjected to aging calibration, the photoionization detector module 3 can be clamped or fixed on the box body 4, the photoionization detector module 3 is fixed relative to the box body 4, and the detection air chamber 313 of the photoionization detector module 3 is located below the photoionization detector 32 therein, that is, the detection port of the photoionization detector 32 faces downward. In this way, contamination of particles possibly present in the standard gas due to gravity deposition on the detection port of the photoionization detector 32 and even on the surface of the uv lamp can be avoided.

In some embodiments, the air inlet 311 and the air outlet 312 of the photoionization detector module 3 are coaxially disposed. As shown in fig. 2, the air inlet 311 and the air outlet 312 are coaxially communicated to form an air passage communicated with the detection air chamber 313, and the photoionization detector 32 is located at one side of the air passage, so that the standard gas can smoothly pass through the detection air chamber 313, thereby avoiding the generation of turbulent flow due to the change of the air passage and improving the detection stability.

As shown in fig. 3, in some embodiments of the present invention, the housing 31 of the photoionization detector module 3 includes a first housing 301 and a second housing 302. A cavity is formed between the first shell 301 and the second shell 302, the photoionization detector 32 is detachably mounted in the cavity, and the first shell 301 and the second shell 302 are detachably connected.

When the photoionization detector 32 works, substances ionized in the detection air chamber 313 are subjected to composite reduction, long-chain molecules, dust and the like are deposited at a detection port of the photoionization detector 32, ultraviolet light transmission is influenced, zero drift and sensitivity are reduced, and a detection result is influenced. To ensure operational stability and measurement accuracy of the photoionization detector 32, the uv lamp window of the photoionization detector 32 also typically needs to be cleaned periodically. In the embodiment, the first casing 301 and the second casing 302 which are detachably connected are arranged, and the photoionization detector 32 is detachably mounted on the first casing 301, so that an ultraviolet lamp window of the photoionization detector 32 can be conveniently cleaned.

As shown in fig. 3, in some embodiments of the present invention, the photoionization detector module 3 further includes a sealing ring 33. The seal ring 33 is provided between the photoionization detector 32 and the inner side wall of the first housing 301. Alternatively, the first housing 301 has a cylindrical structure, and the inner peripheral side of the cylindrical structure is hermetically connected to the photoionization detector 32 by a seal ring 33. The detection air chamber 313 is formed at the first end of the first shell 301, the second shell 302 is connected to the second end of the first shell 301, and the sealing ring 33 can prevent external impurity gas from entering the detection air chamber 313 from the first end of the first shell 301, thereby improving the sealing performance of the detection air path.

Specifically, the inner side wall of the first casing 301 is provided with a stopper surface 3011, and an end surface corresponding to the detection port of the photoionization detector 32 abuts against the stopper surface 3011. The seal ring 33 is provided between an end face corresponding to the detection port of the photoionization detector 32 and the stopper face 3011. Optionally, a groove is formed in the limiting surface 3011, the sealing ring 33 is disposed in the groove, and the thickness of the sealing ring 33 is greater than the depth of the groove.

As shown in fig. 1 and 2, some embodiments of the present invention provide a calibration system for batch calibration of photoionization detectors, which further includes a filter unit 5, wherein the filter unit 5 is in communication with the exhaust port 312 of the photoionization detector module 3. The gas flowing through the photoionization detector module 3 enters the filter unit 5 for filtering, so that the pollution to the environment is prevented.

Optionally, the filtering unit 5 includes a tank and activated carbon, the activated carbon is contained in the tank, the tank is provided with an inlet and an outlet, the inlet is connected with the exhaust port 312, and the outlet is communicated with the atmosphere. Specifically, the entry of body is linked together with the main gas outlet 42 of box 4, and the tail gas that forms after the measurement and analysis is discharged and let in the jar internally through main gas outlet 42, and the organic matter composition in the abundant absorption tail gas of the internal active carbon of jar to avoid producing the influence to the environment. The active carbon in the filtering unit 5 can be replaced regularly according to the actual use condition, and the adsorption efficiency is ensured.

As shown in fig. 1 and 2, some embodiments of the present invention provide a calibration system for batch calibration of photoionization detectors, which further includes a gas supply unit 6. The air supply unit 6 comprises an air bottle 61 and a standard gas bottle 62, the air bottle 61 and the standard gas bottle 62 are respectively communicated with the air inlet 311, electromagnetic valves are arranged on the communication pipelines of the air bottle 61 and the standard gas bottle 62 and the air inlet 311, and the electromagnetic valves are in communication connection with the main control unit 2.

Specifically, a first solenoid valve 631 is disposed on a communication pipeline between the air tank 61 and the air inlet 311, and a second solenoid valve 632 is disposed on a communication pipeline between the air tank 62 and the air inlet 311. The first solenoid valve 631 and the second solenoid valve 632 are both connected to the main control unit 2 in a communication manner, wherein the connection may be through wired communication or wireless communication. The main control unit 2 controls the first solenoid valve 631 or the second solenoid valve 632 to open or close, so as to switch between the clean air and the standard air. A communication pipeline between the air bottle 61 and the air inlet 311 and a communication pipeline between the standard gas bottle 62 and the air inlet 311 are provided with a pressure reducing valve and a flow meter. The air bottle 61 and the air bottle 62 are respectively communicated with an air inlet 311 of the photoionization detector module 3 through a main gas inlet 41 of the box body 4.

In some embodiments, as shown in fig. 2, the collection unit 1, the photoionization detector module 3 and the main control unit 2 are all disposed in the box 4, so that the collection unit 1, the main control unit 2 and the photoionization detector module 3 are integrated into a whole.

Further, the utility model provides a calibration system for calibrating photoionization detector in batches still includes fender bracket 7. The protective frame 7 is connected to the outside of the box 4, and the air bottle 61 and the air label bottle 62 are provided on the protective frame 7. Alternatively, the protective frame 7 may be removably or fixedly attached to the housing 4 such that the protective frame 7 is positionally fixed relative to the housing 4. The air bottle 61 and the air bottle 62 are placed on the protective frame 7 to prevent the air bottle 61 and the air bottle 62 from falling down.

On the basis of the above embodiment, the utility model provides a calibration system for calibrating photoionization detector in batches still includes power supply unit 8, and power supply unit 8 includes air switch, switching power supply module and earthing terminal. An external 220V alternating current power supply is connected with the switching power supply module through an air switch, and after the switching power supply module is electrified, the alternating current 220V voltage is converted into a system working voltage which is supplied to the acquisition unit 1, the main control unit 2 and the photoionization detector 32 in the photoionization detector module 3.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calibration system for batch calibration of photoionization detectors, comprising: the system comprises an acquisition unit, a main control unit and a plurality of photoionization detector modules;

2. The system of claim 1 wherein the photoionization detector module includes a housing and a photoionization detector enclosed within the housing, a detection gas chamber is formed between the photoionization detector and the housing, and the gas inlet and the gas outlet are in communication with the detection gas chamber, respectively.

3. A calibration system for batch calibration of photoionization detectors according to claim 2, wherein the detection gas chamber is located below the photoionization detector; and/or the air inlet and the air outlet are coaxially arranged.

4. The calibration system for batch calibration of photoionization detectors of claim 1, further comprising a housing having a main gas inlet and a main gas outlet, the plurality of photoionization detection modules being serially connected in series between the main gas inlet and the main gas outlet.

5. The system of claim 2 wherein said housing includes a first housing and a second housing defining a cavity therebetween, said photoionization detector being removably mounted within said cavity, said first housing and said second housing being removably attached.

6. The calibration system for batch calibration of photoionization detectors of claim 5, wherein the photoionization detector module further includes a seal ring disposed between the photoionization detector and an interior sidewall of the first housing.

7. The calibration system for batch calibration of photoionization detectors of any one of claims 1 to 6, further comprising a filter unit in communication with the exhaust port.

8. The calibration system for batch calibration of photoionization detectors of claim 7, wherein the filter unit includes a canister and activated carbon, the activated carbon being contained within the canister, the canister having an inlet and an outlet, the inlet being connected to a vent.

9. The system for calibrating photoionization detectors in batches according to any one of claims 1 to 6, further comprising an air supply unit, wherein the air supply unit comprises an air bottle and a standard gas bottle, the air bottle and the standard gas bottle are respectively communicated with the air inlet, and electromagnetic valves are respectively arranged on the communication pipelines of the air bottle and the standard gas bottle and the air inlet, and are in communication connection with the main control unit.

10. The system of claim 9, further comprising a housing and a protective frame, wherein the collection unit, the photoionization detector module and the main control unit are disposed in the housing, the protective frame is connected to an outside of the housing, and the air bottle and the air label bottle are disposed on the protective frame.