CN113865906A - Integrated test system for micro-channel flow and on-way loss of aerosol collector - Google Patents
Integrated test system for micro-channel flow and on-way loss of aerosol collector Download PDFInfo
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Abstract
The invention relates to the field of performance test of aerosol collectors, and particularly discloses a micro-channel flow and on-way loss integrated test system of an aerosol collector, which comprises a communicating vessel, a first connecting pipe, a second connecting pipe, an electric air pump, a controller, a liquid sensor, a timer and a memory, wherein the first connecting pipe is connected with the communicating vessel; the communicating vessel comprises a first vessel and a second vessel, and the bottom of the first vessel is communicated with the bottom of the second vessel through a communicating pipe; the air inlet end of the first connecting pipe is communicated with the opening part of the second container, and the air outlet end of the first connecting pipe is communicated with the inlet end of the collector to be tested; the air outlet end of the second connecting pipe is communicated with the air inlet end of the electric air pump, and the air inlet end of the second connecting pipe is communicated with the outlet end of the collector to be tested; the electric air pump, the liquid sensor, the timer and the memory are all electrically connected with the controller. The invention has simple structure and low cost, and can realize the measurement of the micro-channel flow and the on-way loss of the aerosol collector through simple operation.
Description
Technical Field
The invention relates to the field of performance test of aerosol collectors, in particular to a micro-channel flow and on-the-way loss integrated test system of an aerosol collector.
Background
In atmospheric and industrial environment monitoring, before determining the source of particulate matters and evaluating the harm or potential harm of the particulate matters to human beings and the environment, the components, particle concentration and particle size distribution of aerosol particulate matters need to be known, so that the aerosol needs to be sampled, classified, detected and analyzed in advance, and harmful particles in the environment can be warned. The importance of this requirement is also reflected in that when an emergency event is handled, in order to ensure that first-line rescuers can know the current situation in time and make an accurate judgment, it is necessary to grasp a certain technical means to collect, analyze and handle the environmental threat.
The micro aerosol separator (also called as virtual impactor) is an important device for particle size separation in the process of aerosol collection and monitoring, and the main working principle is to separate aerosol particles with different particle sizes from high-speed airflow by utilizing the difference of inertia force borne by the aerosol particles. In the prior art, the structure of the micro aerosol separator may be as shown in patent CN113171655A, which generally includes a casing, the casing is provided with a gas inlet portion and a particle collecting portion communicated with the gas inlet portion, the gas inlet portion includes a main flow chamber for aerosol to flow in and two side flow chambers respectively disposed at left and right sides of the main flow chamber for pure gas to flow in, the particle collecting portion includes a large particle collecting chamber coaxial with the main flow chamber and two small particle collecting chambers respectively disposed at left and right sides of the large particle collecting chamber, the main flow chamber is disposed along a longitudinal centerline of the casing and located at an upper side of the casing, the two side flow chambers are symmetrically disposed at left and right sides of the main flow chamber, and the two small particle collecting chambers are symmetrically disposed at left and right sides of the large particle collecting chamber.
The micro aerosol collector introduces aerosol into a micro flow channel (the power of the micro aerosol collector can come from an autologous pump or an external pump) from an inlet for separation, and the aerosol after separation and detection is discharged from an outlet. At present, the performance test of a micro aerosol collector at the initial development stage often has the following problems; firstly, the separation efficiency of aerosol particles can be directly influenced by different flow rates of the aerosol particles entering a micro-channel, the flow rate of a micro-aerosol acquisition inlet is detected, precision devices such as a vacuum pump, a throttle valve, a flowmeter and a mass flow rate display are needed, and a test system is complex and high in cost; secondly, aerosol particles can have aerosol particle loss when entering a micro aerosol collector, and further generate path loss, at present, the path loss of the aerosol particles in the micro aerosol collector is detected, a large-scale system composed of a particle generator, an air pump, a throttle valve, an electronic flowmeter, a sensor, a PWM generator and the like is needed, the structure is complex, the operation is complex, and huge cost is needed for realizing the detection in the initial development stage; third, there is no system that can measure both the micro flow channel flow and the on-the-way loss.
Therefore, in order to solve the above problems, a special test system for an aerosol collector is needed, which has a simple structure and low cost, and can realize measurement of micro-channel flow and on-way loss of the aerosol collector through simple and convenient operation.
Disclosure of Invention
In view of the above, the present invention provides an integrated testing system for micro-channel flow and on-way loss of an aerosol collector, which has a simple structure and a low cost, and can implement measurement of the micro-channel flow and on-way loss of the aerosol collector through simple and convenient operations.
In order to achieve the aim, the invention provides an integrated test system for micro-channel flow and on-way loss of an aerosol collector, which comprises a communicating vessel, a first connecting pipe, a second connecting pipe, an electric air pump, a controller, a liquid sensor, a timer and a memory, wherein the first connecting pipe is connected with the communicating vessel;
the communicating vessel comprises a first vessel and a second vessel, and the bottom of the first vessel is communicated with the bottom of the second vessel through a communicating pipe; the air inlet end of the first connecting pipe is communicated with the opening part of the second container, and the air outlet end of the first connecting pipe is communicated with the inlet end of the collector to be tested; the air outlet end of the second connecting pipe is communicated with the air inlet end of the electric air pump, and the air inlet end of the second connecting pipe is communicated with the outlet end of the collector to be tested;
the electric air pump, the liquid sensor, the timer and the memory are all electrically connected with the controller; the liquid sensor is arranged on the communicating vessel and used for detecting whether liquid exists at a set part of the communicating vessel or not and transmitting state data to the controller; the timer is used for recording the time from starting to stopping of the electric air pump and transmitting time data to the controller; the memory is used for storing the data received and processed by the controller; when the liquid sensor detects that no liquid exists at the set part of the communicating vessel, the controller sends a stop signal to the electric air pump.
As a further improvement of the technical scheme of the invention, the system further comprises a third connecting pipe, wherein the third connecting pipe is used for replacing the collector to be tested and is connected with the first connecting pipe and the second connecting pipe.
As a further improvement of the technical scheme of the invention, the system also comprises a display, and the display is electrically connected with the controller and used for displaying data.
As a further improvement of the technical scheme of the invention, the system also comprises a power supply for supplying power to each power utilization component, wherein the power supply is commercial power or a storage battery.
As a further improvement of the technical scheme of the invention, the system also comprises an operating platform, wherein the operating platform comprises a transverse plate and a longitudinal plate vertical to the transverse plate; the controller, the timer and the memory are integrally installed on a control shell, and the communicating device, the control shell and the display are all installed on the longitudinal plate in a positioning mode.
As a further improvement of the technical scheme of the invention, the outer walls of the first container, the second container or/and the communicating pipe are/is provided with a volume scale layer.
As a further improvement of the technical scheme of the invention, the mouth part of the second container is connected with a sealing cover, and the air inlet end of the first connecting pipe penetrates through the sealing cover and then is communicated with the inner cavity of the second container.
As a further improvement of the technical scheme of the invention, the first container, the second container and the communicating pipe are all transparent structures, and the liquid sensor is of an infrared sensor structure and is connected to the outer wall of the first container, the second container or the communicating pipe.
As a further improvement of the technical scheme of the invention, the first container and the second container are both of a straight-tube structure and are symmetrically arranged, and the communicating tube is of a self-symmetric U-shaped tube structure; the liquid sensor is connected to the outer wall of the communicating pipe, and the probe end of the liquid sensor is aligned to the middle of the communicating pipe.
Compared with the prior art, the invention has the following beneficial technical effects:
the integrated test system for the micro-channel flow and the on-way loss of the aerosol collector, provided by the invention, has the advantages of simple structure and low cost, and can realize the measurement of the micro-channel flow and the on-way loss of the aerosol collector through simple and convenient operation.
When the flow of the micro-channel of the aerosol collector is detected, the inlet end and the outlet end of the collector to be detected are respectively connected with the air outlet end of the first connecting pipe and the air inlet end of the second connecting pipe, then colored liquid is injected into the communicating device, the electric air pump is started, the timer starts timing at the same time, the colored liquid moves along with the direction of the air flow under the action of the electric air pump, after the colored liquid flows through the setting part of the communicating device, the flow volume at the moment is a set value, under the data feedback of the liquid sensor, the controller controls the electric air pump to be closed, the timer finishes timing at the same time, the time recorded by the timer is the flow time of the colored liquid with the set volume, and the controller can calculate the flow value of the aerosol collector through the flow volume and the flow time.
When the loss along the way of the micro-channel of the aerosol collector is detected, two different working states are needed; in a first working state, connecting the air outlet end of the first connecting pipe with the air inlet end of the second connecting pipe, then injecting colored liquid into the communicating vessel, starting the electric air pump, starting timing by the timer, moving the colored liquid along with the air flow direction under the action of the electric air pump, wherein after the colored liquid flows through the setting part of the communicating vessel, the flowing volume is a set value, under the data feedback of the liquid sensor, the controller controls the electric air pump to be closed, and the timer finishes timing at the same time, wherein the time recorded by the timer is the first flowing time of the colored liquid with the set volume; then switching to a second working state, disconnecting the air outlet end of the first connecting pipe from the air inlet end of the second connecting pipe (the colored liquid automatically resets after disconnection) and respectively connecting the air outlet end and the inlet end of the collector to be detected, starting the electric air pump, starting timing by the timer, moving the colored liquid along with the air flow direction under the action of the electric air pump, enabling the flowing volume to be a set value after the colored liquid flows through a setting part of the communicating device, controlling the electric air pump to be closed by the controller under the data feedback of the liquid sensor, ending timing by the timer, and enabling the time recorded by the timer to be the second flowing time of the colored liquid with the set volume; the controller can obtain the flow difference through the difference between the first flow time and the second flow time, further obtain the speed difference, and then calculate the on-way loss value of the aerosol collector by combining the self-existing parameters of the collector to be tested.
Therefore, when the testing system is used for detecting the flow, an experimental system with a complex structure, such as a vacuum pump, a throttle valve, a flowmeter, a mass flow rate display and the like, is not needed, the structure is simple, the cost is low, and the flow testing cost can be reduced by about ten times through measurement and calculation; when the on-the-way loss of the aerosol particles is detected, the test system is more visual, simple and quick to operate, simpler in structure and lower in cost, and the on-the-way loss test cost can be reduced by about twenty times through measurement and calculation.
Meanwhile, the flow detection and the on-way loss detection are related, so that the two detections can be carried out simultaneously, and the detection integration is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention in a state of being connected to a collector to be tested;
FIG. 2 is a schematic structural diagram of the invention in a state of not being connected to a collector to be tested;
FIG. 3 is a connection block diagram of the controller of the present invention;
fig. 4 is a schematic perspective view of the liquid sensor according to the present invention in a state of not being connected thereto.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments; of course, the drawings are simplified schematic drawings, and the scale of the drawings does not limit the patented products.
Examples
As shown in fig. 1 to 4 (arrows in fig. 1 and 2 indicate the flow direction of the air flow driven by the electric air pump): the embodiment provides an integrated test system for micro-channel flow and on-way loss of an aerosol collector, which comprises a communicating vessel, a first connecting pipe 21, a second connecting pipe 22, an electric air pump 3, a controller 4, a liquid sensor 5, a timer 6 and a memory 7.
The first connecting pipe 21 and the second connecting pipe 22 can be flexible rubber pipes; the electric air pump 3 can be a micro air pump; the controller 4 may be a single chip microcomputer, and both the timer 6 and the memory 7 may be integrated in the controller 4. Of course, the system further comprises a power supply 8 for supplying power to the electric components, and the power supply 8 can be mains power or a storage battery.
In order to facilitate data display, the system can also comprise a display 9, wherein the display 9 is electrically connected with the controller 4 and is used for data display; the display 9 may also be provided with control buttons through which the operator can view the relevant data and also manually control the electric air pump 3.
The system also comprises an operation platform, wherein the operation platform comprises a transverse plate 101 and a longitudinal plate 102 vertical to the transverse plate 101; the controller 4, the timer 6 and the memory 7 are integrally mounted on a control housing 103, and the communicator, the control housing 103 and the display 9 are positioned and mounted on the longitudinal plate 102. The transverse plate 101 can be provided with a connecting screw hole to be connected with the experiment table; during testing, the transverse plate 101 is kept parallel to the horizontal plane, and the longitudinal plate 102 is vertically arranged, so that the whole structure of the system is of a longitudinal structure, the occupied space is greatly reduced, and the compactness of the system is improved.
The communicating vessel comprises a first vessel 11 and a second vessel 12, and the bottom of the first vessel 11 is communicated with the bottom of the second vessel 12 through a communicating pipe 13; the air inlet end of the first connecting pipe 21 is communicated with the opening part of the second container 12, and the air outlet end is communicated with the inlet end of the collector 104 to be tested; the air outlet end of the second connecting pipe 22 is communicated with the air inlet end of the electric air pump 3, and the air inlet end is used for being communicated with the outlet end of the collector 104 to be tested.
The collector 104 to be tested can be connected between the first connecting pipe 21 and the second connecting pipe 22, or the first connecting pipe 21 is connected with the second connecting pipe 22, so as to meet the test requirement; in order to facilitate the connection between the first connection tube 21 and the second connection tube 22, the system may further include a third connection tube 23, where the third connection tube 23 is used to connect the first connection tube 21 and the second connection tube 22 instead of the collector 104 to be tested.
The mouth of the second container 12 is connected with a sealing cover, and the air inlet end of the first connecting pipe 21 passes through the sealing cover and then is communicated with the inner cavity of the second container 12.
The electric air pump 3, the liquid sensor 5, the timer 6 and the memory 7 are all electrically connected with the controller 4; the liquid sensor 5 is arranged on the communicating vessel and used for detecting whether liquid exists at a set part of the communicating vessel or not and transmitting state data to the controller 4; the timer 6 is used for recording the time from starting to stopping of the electric air pump 3 and transmitting time data to the controller 4; the memory 7 is used for storing data received and processed by the controller 4; when the liquid sensor 5 detects that no liquid exists at the set portion of the communicating vessel, the controller 4 sends a stop signal to the electric air pump 3.
Through the test system of above-mentioned structure, can realize the detection to the flow of aerosol collector microchannel and along journey loss, specifically:
firstly, when detecting the flow of the micro-channel of the aerosol collector, the inlet end and the outlet end of the collector 104 to be detected are respectively connected with the air outlet end of the first connecting pipe 21 and the air inlet end of the second connecting pipe 22, then colored liquid (the total volume of the colored liquid is less than the inner cavity volume of the first container 11 and the second container 12) is injected into the communicating vessel, the electric air pump 3 is started, and the timer 6 starts timing, the colored liquid moves along with the direction of the air flow under the action of the electric air pump 3, after the colored liquid flows through the setting part of the communicating vessel, the flowing volume is a set value, under the data feedback of the liquid sensor 5, the controller 4 controls the electric air pump 3 to be closed, and the timer 6 finishes timing, the time recorded by the timer 6 is the flow time of the colored liquid with the set volume, and the controller 4 can calculate the flow value of the aerosol collector through the flow volume and the flow time. For example, the measurement formula for flow rate Q may be: q is V/t; wherein V is the flow volume of the colored liquid, and t is the flow time of the colored liquid under the flow volume.
Secondly, when the loss along the way of the micro-channel of the aerosol collector is detected, two different working states are needed; in a first working state, the air outlet end of the first connecting pipe 21 is connected with the air inlet end of the second connecting pipe 22, then colored liquid is injected into the communicating vessel, the electric air pump 3 is started, meanwhile, the timer 6 starts timing, the colored liquid moves along with the direction of air flow under the action of the electric air pump 3, after the colored liquid flows through from the setting part of the communicating vessel, the flowing volume is a set value, under the data feedback of the liquid sensor 5, the controller 4 controls the electric air pump 3 to be closed, meanwhile, the timer 6 finishes timing, and the time recorded by the timer 6 is the first flowing time of the colored liquid with the set volume; then switching to a second working state, disconnecting the air outlet end of the first connecting pipe 21 from the air inlet end of the second connecting pipe 22 (the colored liquid automatically resets after disconnection) and respectively connecting the air outlet end and the inlet end of the collector 104 to be detected, then starting the electric air pump 3, starting timing by the timer 6, moving the colored liquid along with the air flow direction under the action of the electric air pump 3, when the colored liquid flows through from the setting part of the communicating device, the flow volume is a set value, under the data feedback of the liquid sensor 5, controlling the electric air pump 3 to be closed by the controller 4, finishing timing by the timer 6, and the time recorded by the timer 6 is the second flow time of the colored liquid with the set volume; the controller 4 can obtain the flow difference through the difference between the first flow time and the second flow time, so as to obtain the speed difference, and then the on-way loss value of the aerosol collector can be calculated by combining the self-existing parameters of the collector 104 to be tested. For example, loss h along the wayfThe measurement formula of (c) may be:
wherein, lambda is the on-way resistance coefficient, l represents the length of the micro-channel pipe, d represents the pipe diameter of the micro-channel, v represents the speed difference, and g represents the acceleration of gravity.
In this embodiment, the first container 11, the second container 12 and the communicating pipe 13 are all transparent structures, and the liquid sensor 5 is an infrared sensor structure and can be connected to the outer wall of the first container 11, the second container 12 or the communicating pipe 13; at the moment, the arrangement of the liquid sensor 5 cannot influence the flow of the colored liquid, and the testing precision of the system is improved. In order to observe the total volume and the flowing volume of the colored liquid, the outer walls of the first container 11, the second container 12 and the communicating pipe 13 can be provided with volume scale layers.
As a preferred embodiment, the first container 11 and the second container 12 are both of a straight-tube structure and are symmetrically arranged, and the communication tube 13 is of a self-symmetric "U" -shaped tube structure; the liquid sensor 5 is connected to the outer wall of the communicating pipe 13, and the probe end of the liquid sensor 5 is aligned to the middle part of the communicating pipe 13; colored liquid can enter the communicating vessel from the mouth of the first container 11, and since the whole structure of the communicating vessel is bilaterally symmetrical (the left and right directions are based on the directions shown in fig. 1 and 2), after a specific volume of colored liquid is injected, the distribution of the colored liquid is also bilaterally symmetrical, since the probe end of the liquid sensor 5 is aligned with the middle part of the communicating tube 13, the timing when the electric air pump 3 stops is the time when the colored liquid on the left side of the communicating vessel completely flows to the right side of the communicating vessel, and half of the injection volume of the colored liquid is the flow volume of the colored liquid.
Finally, the principle and embodiments of the present invention are explained by using specific examples, and the above descriptions of the examples are only used to help understand the core idea of the present invention, and the present invention can be modified and modified without departing from the principle of the present invention, and the modified and modified examples also fall into the protection scope of the present invention.
Claims (9)
1. The utility model provides an aerosol collector microchannel flow and on-the-way loss integration test system which characterized in that:
the system comprises a communicating vessel, a first connecting pipe, a second connecting pipe, an electric air pump, a controller, a liquid sensor, a timer and a memory;
the communicating vessel comprises a first vessel and a second vessel, and the bottom of the first vessel is communicated with the bottom of the second vessel through a communicating pipe; the air inlet end of the first connecting pipe is communicated with the opening part of the second container, and the air outlet end of the first connecting pipe is communicated with the inlet end of the collector to be tested; the air outlet end of the second connecting pipe is communicated with the air inlet end of the electric air pump, and the air inlet end of the second connecting pipe is communicated with the outlet end of the collector to be tested;
the electric air pump, the liquid sensor, the timer and the memory are all electrically connected with the controller; the liquid sensor is arranged on the communicating vessel and used for detecting whether liquid exists at a set part of the communicating vessel or not and transmitting state data to the controller; the timer is used for recording the time from starting to stopping of the electric air pump and transmitting time data to the controller; the memory is used for storing the data received and processed by the controller; when the liquid sensor detects that no liquid exists at the set part of the communicating vessel, the controller sends a stop signal to the electric air pump.
2. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector according to claim 1, which is characterized in that:
the system also comprises a third connecting pipe, and the third connecting pipe is used for replacing the collector to be tested and is connected with the first connecting pipe and the second connecting pipe.
3. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector according to claim 1, which is characterized in that:
the system also comprises a display which is electrically connected with the controller and used for displaying data.
4. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector as claimed in claim 3, wherein:
the system also comprises a power supply for supplying power to each power consumption component, wherein the power supply is commercial power or a storage battery.
5. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector as claimed in claim 3, wherein:
the system also comprises an operating platform, wherein the operating platform comprises a transverse plate and a longitudinal plate vertical to the transverse plate; the controller, the timer and the memory are integrally installed on a control shell, and the communicating device, the control shell and the display are all installed on the longitudinal plate in a positioning mode.
6. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector according to claim 1, which is characterized in that:
and volume scale layers are arranged on the outer walls of the first container, the second container or/and the communicating pipe.
7. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector according to claim 1, which is characterized in that:
the mouth part of the second container is connected with a sealing cover, and the air inlet end of the first connecting pipe penetrates through the sealing cover and then is communicated with the inner cavity of the second container.
8. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector as claimed in any one of claims 1 to 7, wherein:
the first container, the second container and the communicating pipe are all transparent structures, and the liquid sensor is of an infrared sensor structure and is connected to the outer wall of the first container, the outer wall of the second container or the outer wall of the communicating pipe.
9. The integrated test system for the micro-channel flow and the on-way loss of the aerosol collector of claim 8, which is characterized in that:
the first container and the second container are both of a straight-tube structure and are symmetrically arranged, and the communicating tube is of a self-symmetric U-shaped tube structure; the liquid sensor is connected to the outer wall of the communicating pipe, and the probe end of the liquid sensor is aligned to the middle of the communicating pipe.
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