KR20220041277A - Performance test device and method for portable negative pressure apparatus - Google Patents

Abstract

The present invention relates to a performance test device and method for a portable negative pressure apparatus, which comprises: a test duct configured to allow a portable negative pressure apparatus and pressure gauge to be evaluated to be mounted therein and including a front end part and a rear end part with respect to the portable negative pressure apparatus, wherein the pressure in the test duct by the portable negative pressure apparatus is checked by using the pressure gauge; a test particle supply unit configured to supply test particles to be supplied into the test duct, wherein the test particles include KCl particles; a concentration measurement unit configured to measure the concentration of test particles at the front and rear end part; and a performance test unit calculating a leak rate on the basis of the concentration of the test particles of the front end part and the concentration of the test particles of the rear end part, which are measured by the concentration measurement unit, and determining whether the calculated leak rate satisfies a predetermined standard. Accordingly, it can be easily determined whether the portable negative pressure apparatus meets evaluation criteria and a certification system.

Description

Performance test device and method for portable negative pressure apparatus

The present invention relates to an apparatus and method for evaluating the performance of a mobile negative pressure device, and more particularly, to an apparatus and method for evaluating the performance of a mobile negative pressure device suitable for evaluation criteria and certification system.

The threat of viruses and pathogens is increasing worldwide, and as exchanges between countries become active, the occurrence of new infectious diseases is becoming more frequent. In particular, 75% of new infectious diseases such as COVID-19, SARS, bird flu, swine flu, Ebola, and MERS have evolved from wild animals to human-infected viruses, threatening public health.

In response to this threat, it is compulsory to secure a negative pressure room for medical institutions with more than 300 beds, but a shortage of negative pressure beds is expected when an actual epidemic occurs.

Although related industries such as mobile negative pressure hospital rooms and screening clinics are being largely formed, products with poor performance, such as decreased airflow and increased noise due to the installation of HEPA filters, and increased leakage rate due to decreased airtightness, are being distributed.

Therefore, with these problems, there is a need for a performance evaluation device and method that can easily determine whether the mobile sound pressure facility meets the evaluation criteria and certification system, as well as the evaluation standard and certification system itself. come.

KR 10-2020-0044741 A KR 10-1693494 B1

Accordingly, it is an object of the present invention to provide an apparatus and method for evaluating the performance of a portable negative pressure machine suitable for the evaluation criteria and authentication system of the portable negative pressure machine.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The object is, according to a first aspect of the present invention,

A test duct comprising a front end and a rear end with respect to the movable negative pressure machine, and the pressure in the test duct by the movable negative pressure machine is confirmed using the pressure gauge ;

a test particle supply unit configured to supply test particles to be supplied into the test duct, wherein the test particles include KCl particles;

a concentration measuring unit configured to measure the concentration of each test particle at the front end and the rear end; and

Comprising a performance evaluation unit that calculates a leak rate based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured by the concentration measuring unit, and determines whether the calculated leak rate satisfies a predetermined standard,

It is achieved by a mobile negative pressure device performance evaluation device.

Here, the test particle supply unit may include a test particle generating unit configured to generate test particles, and a test particle diffusion unit disposed at the front end and configured to evenly distribute the test particles to the front end.

At this time, the test particle generator includes a compressed air supply for supplying compressed air, a spraying device for spraying a 1 mass % KCl aqueous solution together with the compressed air in the form of an aerosol, and drying and removing water vapor from the aerosol generated by the spraying device may include a diffusion dryer configured to It may be included sequentially in the direction toward the rear end.

The predetermined criterion is 0.05% or less, and the movable negative pressure unit may include a HEPA filter.

In addition to this, the concentration measuring unit may include a light scattering type automatic particle counter, and further, the concentration measuring unit may calculate an average of the concentrations collected from at least five sampling locations in order to measure the concentration of the test particles at the rear end.

Furthermore, according to the second aspect of the present invention,

In the performance evaluation method using the mobile negative pressure device performance evaluation device as described above,

Mounting a mobile negative pressure device to be evaluated for performance in the test duct;

checking the pressure in the test duct by the movable negative pressure machine;

supplying test particles to be supplied into the test duct;

Measuring the concentration of each test particle at the front end and the rear end; and

Calculating a leak rate based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured by the concentration measuring unit, and determining whether the calculated leak rate satisfies a predetermined criterion,

This is achieved by the mobile negative pressure machine performance evaluation method.

According to the apparatus and method for evaluating the performance of the portable negative pressure device of the present invention as described above, there is an advantage that it can be easily determined whether the portable negative pressure device meets the evaluation criteria and the authentication system.

In addition, according to the apparatus and method for evaluating the performance of a portable negative pressure device of the present invention, there is an advantage in that a portable negative pressure device that meets the evaluation criteria and certification system of the portable negative pressure device is supplied to the market, thereby preserving and improving the health of the people.

1 is a view showing an example of a performance evaluation device for the rated air volume of a mobile negative pressure machine according to the present invention.
2 is a view showing other examples of the performance evaluation apparatus for the rated air volume of the mobile negative pressure machine according to the present invention.
3 is a view showing an example of a performance evaluation method for the noise level of the mobile sound pressure machine according to the present invention.
4 is a view showing an example of a performance evaluation device for the fine dust leakage rate of the mobile negative pressure device according to the present invention.
5 is a configuration diagram of a light scattering type automatic particle counter that can be employed in the apparatus for evaluating the performance of a mobile negative pressure device of the present invention.

Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the contents described in the accompanying drawings. However, the present invention is not limited or limited by the exemplary embodiments. The same reference numerals provided in the respective drawings indicate members that perform substantially the same functions.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part "includes" a certain element, this means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

Definition of Terms

- Portable negative pressure device: A portable blower that discharges air from indoors to outdoors in order to maintain the pressure in the indoor space at a higher or lower negative pressure than the outside, and a HEPA filter is installed to prevent the spread of infectious agents.

- Portable positive pressure device: A portable blower that supplies clean air from the outdoors to the room for the purpose of maintaining the pressure of the indoor space at a higher positive or lower negative pressure than the outside. installed device.

- Rated air volume: The air volume when the portable positive/negative pressure machine is operated at the rated frequency and rated voltage. If there is an air volume control device, it refers to the maximum air volume. At this time, it is preferable that the rated voltage is 250V of single-phase AC or 480V of three-phase AC or less for safety, for example, 220V, 380V, 440V, 220V/380V, or 380V/440V for single-phase AC and 220V for 3-phase AC It can be set to any one of them, and the rated frequency can be set to 60 Hz.

- Rated application area: The application area when the mobile positive/negative pressure machine is operated at the rated air volume.

- HEPA filter: A high-performance filter that captures 99.95% or more of particles with respect to the Minimum Penetration Particle Size (MPPS) or 99.97% or more with respect to the 0.3 ㎛ particle size.

- Power supply: A device that encompasses the power supply and control unit for supplying input power to the dust collector filter and blower constituting the portable positive/negative pressure device.

- Rated fine dust leakage rate: Refers to the ratio of the fine dust concentration on the discharge side to the fine dust concentration on the inlet side obtained when the mobile positive/negative pressure machine is operated at the rated air volume and is expressed as a percentage.

As mentioned above, the present invention is a mobile positive/negative pressure that is installed in a similar place, such as a mobile ward, a screening clinic, etc. It relates to an apparatus and method for evaluating the performance of a portable negative pressure machine suitable for evaluating the safety and performance of a device, in which case the rated voltage of the portable negative pressure machine is basically 250 V or less for single-phase devices and 480 V or less for other devices, KS C It would be preferable that the product passed the product safety test (acquisition of electrical safety type approval) in accordance with 60335-1 (safety of household and similar electrical equipment).

Here, the performance evaluation of the portable negative pressure machine is performed in a place that maintains a temperature of 23 ± 5 °C, and an atmospheric pressure of 760 ± 20 mmHg in the absence of wind, which can be regarded as a normal calm ambient environment condition, unless otherwise specified. It is preferable to be In particular, in the performance evaluation of the fine dust leakage rate of the portable negative pressure machine, it is preferable to perform in the range of 55 ± 15% of relative humidity in addition to this.

The performance of such a mobile negative pressure machine can be evaluated with respect to, for example, a rated air volume, a noise level, and a fine dust leakage rate. First, the performance evaluation for the rated air volume will be described with reference to FIG. 1 . (Here, in fact, the performance evaluation device and method for the mobile negative pressure machine can be directly applied to the mobile positive pressure machine, and the description of the performance evaluation device method for the mobile negative pressure machine can also be applied to the mobile positive pressure machine as it is, so it is different from the mobile positive pressure machine. Unless there is a special need for a description of the performance evaluation device and method, a separate description will be omitted.)

1 is a view showing an example of a performance evaluation device for the rated air volume of a mobile negative pressure machine according to the present invention.

Referring to FIG. 1 , the performance evaluation device of the mobile negative pressure machine includes at least a test duct 10 configured to mount the mobile negative pressure device 1 to be performance evaluated, and in the test duct 10, An air volume measuring device 20 configured to measure the air volume by the built-in blower 10a, and a performance evaluation unit 40 for determining whether the air volume measured by the air volume measuring device 20 satisfies a predetermined standard includes In addition to this, it may further include a fan 30 for discharging the air blown by the movable negative pressure machine to the outside.

Here, the air volume measuring device 20 is, but is not limited thereto, for example, as shown in FIG. 1, is composed of an orifice and a pressure gauge inserted into the test duct, and obtains the flow rate from the pressure difference before and after the orifice. It may be an orifice flow meter that is a flow meter. At this time, the orifice may be replaced according to the amount of air to be measured, for example, according to KS B 6311 (Test method of blower).

The performance evaluation of the rated air volume of this portable negative pressure machine is performed by operating the portable negative pressure machine at the rated frequency and rated voltage. If it is within ±10% of the air volume, it will be able to be distributed in the market as a portable negative pressure device that has passed the performance evaluation.

Furthermore, a pressure gauge 60 for checking the pressure in the test duct may be additionally installed in the performance evaluation device of the mobile negative pressure machine. This is a device for checking whether atmospheric pressure is maintained at the rear end of the mobile negative pressure machine during air volume measurement. In actual application, the pressure gauge 60 is installed, the movable negative pressure machine 1 is operated at the rated air volume, and the blowing fan 30 After adjusting the pressure so that the differential pressure of the pressure gauge 60 becomes 0, the air volume of the air volume measuring device 20 is measured in this state.

In addition, the application area of the mobile negative pressure machine can also be calculated based on the rated air volume. The application area of the mobile negative pressure machine is defined as the indoor area that can show ventilation conditions 6 times per hour when installed indoors. At this time, the ceiling height of the room shall be 2.4 m as a standard. The applied area is calculated by the following formula.

Here, A is the applied area (m ² ), and Q is the rated air volume (m ³ /min).

The calculated application area can be displayed together with the rated air volume, and it will act as a criterion for the user to select a portable negative pressure device suitable for the application area to be installed.

2 is a view showing other examples of the performance evaluation apparatus for the rated air volume of the portable negative pressure machine according to the present invention. At this time, (a) and (b) of Figure 2, compared with Figure 1, the test duct 10 upstream side is provided with a front end 10' of the test duct, and the air in the front end 10' The difference is that the perforated plate 50 for uniform flow is mounted (in this case, the test duct 10 can be referred to as the rear end of the test duct). This additional configuration may be more suitable for controlling the uniformity, temperature and/or pressure of the air flowing into the mobile negative pressure device to be evaluated for performance.

Figure 2 (a), compared with Figure 2 (b), to maintain the pressure difference between the outside and the front end (10') of the test duct at the air inlet of the front end (10') of the test duct There is a difference in that the differential pressure maintenance damper (6) installed for this purpose is mounted.

On the other hand, in the state in which the differential pressure maintaining damper 6 is mounted, the air volume was measured for 5 different types of movable negative pressure machines distributed in the market while varying the pressure applied to the front end 10' of the test duct. .

product A product B C product D product E product Pressure (Pa) Airflow (m ³ /min) Pressure (Pa) Airflow (m ³ /min) Pressure (Pa) Airflow (m ³ /min) Pressure (Pa) Airflow (m ³ /min) Pressure (Pa) Airflow (m ³ /min) 0.4 6.93 0.2 3.50 - - 1.0 11.04 1.5 11.77 2.5 6.89 2.5 3.47 2.6 18.44 2.5 11 2.5 11.74 5.0 6.87 5.0 3.45 5.0 18.39 5.0 10.96 5.0 11.7 7.5 6.85 7.5 3.44 7.5 18.30 7.5 10.93 7.5 11.66 10.0 6.82 10.0 3.40 10.0 18.25 10.0 10.9 10.0 11.62

Accordingly, even when a pressure of -2.5 to -10 Pa is applied to the front end 10' of the test duct, it can be seen that the decrease in air volume due to this is within 2%. ) to install the differential pressure holding damper (6) to maintain the pressure difference between them is up to the user's choice.

2 (a), as compared with FIG. 2 (b), the pressure gauge 60 for checking the pressure in the test duct is provided, but there is a difference in the measurement position.

This is, for example, in the case where the movable negative pressure device is installed as in FIG. It can be designated as the front end of the negative pressure device. At this time, the negative pressure at the front end of the movable negative pressure machine can be adjusted by, for example, the differential pressure maintenance damper (6). In addition, the pressure at the rear end of the movable negative pressure machine can be adjusted using the blower fan 30 to be 0, which can be confirmed using the pressure gauge 60 or the additional pressure gauge 60'.

Similarly, for example, in the case where a mobile positive pressure device is installed as in FIG. 2(b), a predetermined positive pressure, for example, 0 to 10 Pa, is well maintained at the rear end of the mobile positive pressure device. The position can be designated as the rear end of the mobile positive pressure machine. At this time, the pressure at the front end of the mobile positive pressure machine can be adjusted using the blower fan 30 to be 0, and this can also be confirmed using the pressure gauge 60 or the additional pressure gauge 60'.

3 is a view showing an example of a performance evaluation method for the noise level of the mobile sound pressure machine according to the present invention.

The performance evaluation of the noise value of the mobile sound pressure machine is performed by operating the mobile sound pressure machine at the rated frequency and rated voltage as in the performance evaluation of the air volume. It will be possible to measure the noise level more accurately when it is installed on the pedestal.

Referring to FIG. 3, the performance evaluation of the noise value of the mobile sound pressure machine is performed at least at five measurement points on the front, rear, left, right, and upper side based on the mobile sound pressure device to be evaluated, for example, KS C 1502 or 1505 It is desirable to measure the noise using the sound level meter specified in . At this time, the distance from the mobile negative pressure device to the five measurement points on the front, rear, left, right and upper sides is preferably 1 m, and the position of the movable negative pressure device as a reference can be determined based on the horizontal and vertical center lines. there is.

In this case, the noise measured at at least five measurement points may be used as a measured noise value by using any one of a maximum value, a minimum value, an average value, and a median value as a representative value, and the average value may be, for example, an arithmetic average value. The noise value measured in this way, but is not limited thereto, for example, in the case of 55 dB or less, which corresponds to one of the noise standards of the air purifier, it will be able to be distributed in the market as a portable sound pressure device that has passed the performance evaluation.

Next, the performance evaluation for the fine dust leakage rate will be described with reference to FIG. 4 . 4 is a view showing an example of a performance evaluation device for the fine dust leakage rate of the mobile negative pressure device according to the present invention.

Referring to FIG. 4 , the performance evaluation apparatus of a mobile negative pressure device according to the present invention is configured to mount a movable negative pressure device 1 and a pressure gauge 60 to be performance evaluated, and the movable negative pressure device 1 is based on As a test duct (10', 10) including a front end and a rear end; a test particle supply unit configured to supply test particles to be supplied into the test duct; Concentration measuring unit 70 configured to measure the concentration of each test particle at the front end and the rear end of the test duct; and a performance evaluation unit 74 for calculating a leak rate based on the concentration of the front end test particles and the rear end test particles measured by the concentration measuring unit, and determining whether the calculated leak rate satisfies a predetermined standard. includes

Here, the configuration of the test duct corresponds to KS B 6740 (air filter performance test method for clean room) or KS B 6141 (type 1 of air filter unit for ventilation) as shown in FIG. 4, and the upstream side is the aerosol concentration If an aerosol of uniform concentration within a deviation of ±10% can be supplied, the mixing orifice/mixing elbow can be used without being limited to the venturi shape, or the test duct employed in the performance evaluation device for the air volume described above can also be used. In addition to this, a fan 30 for discharging the air blown by the movable negative pressure machine to the outside, a perforated plate 50 for uniform air flow may be mounted, and optionally the differential pressure maintaining damper 6 of FIG. ) instead of a HEPA filter or a higher performance ULPA filter 6 ′ may be installed. Also, similarly to FIGS. 1 to 2 , a pressure gauge 60 may be mounted to check the pressure in the test duct by the movable negative pressure device 1 .

The test particle supply unit includes a test particle generating unit 80 configured to generate test particles, and a test particle diffusion unit disposed at the front end of the test duct and configured to evenly distribute the test particles to the front end of the test duct. include

At this time, the test particle generating unit 80 is to dry and remove water vapor from the aerosol generated by the atomizing device 81, and the atomizing device 81, which atomizes at least 1 mass % KCl aqueous solution in the form of an aerosol together with compressed air. and a diffusion dryer 82 configured. In addition to this, it may further include a compressed air supply unit for supplying compressed air, and a neutralizer 83 for neutralizing static electricity of the test particles.

In the test particle diffusion part, a spraying device 84 for dispersing test particles to at least the opposite side of the movable negative pressure device for even distribution of test particles, a circulation fan 85 disposed at the bottom of the front end of the test duct, and a perforated plate 50 ) may be installed sequentially from the front end to the rear end of the test duct.

On the other hand, the concentration measuring unit 70 is configured to measure the concentration of the test particles at the front end and the rear end of the test duct, respectively, for this purpose, a shear measuring head 71 for measuring the concentration of the test particles at the front end of the test duct ), a valve controlled to measure the number of particles collected in any one of the rear end measuring head 72, the front end measuring head 71, or the rear end measuring head 71 for measuring the concentration of test particles at the rear end of the test duct (75), and a counter 73 for calculating the number concentration by measuring the number of particles collected by the front end measuring head 71 or the rear end measuring head 71.

The position of the shear measuring head 71 is preferably in the middle of the height of the test duct so that it can be sampled based on a relatively even particle concentration and right in front of the suction part of the mobile negative pressure device to be evaluated. Similarly, the trailing measurement head 72 also aerosolizes all ejected particles from the mobile negative pressure device and mid-height at the rear end of the test duct long enough compared to the front end of the test duct so that it can be sampled based on a relatively even particle concentration. It is desirable that the location be sufficiently far from the discharge part of the mobile negative pressure machine to allow mixing and sampling. In particular, in the case where the rear end of the test duct is not long enough to allow sampling based on a relatively uniform particle concentration, it is preferable to calculate the average of the concentrations sampled from at least five sampling locations.

At this time, it is preferable that the counter 73 is a light-scattering type automatic particle counter.

Here, as stipulated in KS B 6336, the light scattering automatic particle counter is a counter that continuously suctions air and measures the particle diameter and number of suspended particles therein to obtain the particle concentration in the air, as shown in FIG. At least a light source 51, an air suction system 52, an optical system 53 for irradiation and condensing, a photoelectric conversion unit 54, a wave height analysis unit 55, an internal reference and generation unit 56, and an input/output terminal for testing (57a, 57b), and further may include a display unit 58 for displaying the counting result, and the measurement principle is as follows.

A predetermined flow rate of sample air containing suspended particles is sucked from the sample suction port and passed through the irradiation area by the stabilized light source. At this time, the light scattered forward or sideways by the individual suspended particles is condensed on a photoelectric element such as a photomultiplier tube and converted into a pulsed electric signal.

The peak value of the pulse signal is proportional to the amount of scattered light, and using the fact that the amount of scattered light and the diameter of suspended particles have a constant relationship, the particle diameter is selected by analysis of the pulse peak value, and the specified particle diameter is also counted by counting the number of selected pulses. Calculate the number of passages of larger particles, and calculate the particle concentration from the suction air volume and the number of selected particles during a certain measurement time.

Here, the light scattering automatic particle counter employable in the present invention can measure particles of 0.1 or 0.12 μm or more, and in particular, the specific particle diameter thereof can be 0.3 μm.

The performance evaluation unit 74 calculates a leak rate based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured by the concentration measuring unit 70, and whether the calculated leak rate satisfies a predetermined standard to determine whether or not, which will be discussed in more detail below.

The method for performance evaluation by calculating the fine dust leakage rate using the performance evaluation device of such a mobile negative pressure machine is as follows.

First, (1) The mobile negative pressure device to be evaluated for performance is installed in the test duct. In this case, it is essential to keep it airtight so that there is no air leakage as in the performance evaluation for the air volume of the movable negative pressure machine.

Also (2) Check the pressure in the test duct by the mobile negative pressure machine to be evaluated. At this time, it should be checked whether the atmospheric pressure is well maintained at the rear end of the movable negative pressure machine while operating stably with the rated air volume of the movable negative pressure machine. In order to monitor this, a pressure gauge 60 may be included, similarly to the performance evaluation device for the air volume of the mobile negative pressure machine of FIGS. 1 and 2 .

Next, (3) test particles are supplied into the test duct. These test particles use polydisperse solid potassium chloride (KCl) particles corresponding to particles of 0.3 μm in size, and in particular, using 1 mass % KCl aqueous solution, that is, It can be produced by spraying an aqueous solution in which reagent grade potassium chloride is dissolved in pure water (or distilled water). At this time, it should be checked whether the supply of test particles is constantly stable while operating stably with the rated air volume of the portable negative pressure machine. In order to monitor this, similarly to the performance evaluation apparatus for the air volume of the mobile negative pressure machine of FIGS. 1 and 2, it is configured to measure the air volume by the blower 10a built in the movable negative pressure machine in the test duct 10 It may include a wind volume measuring device 20, which further comprises a wind volume monitoring unit (not shown) for monitoring whether the air volume measured by the air volume measuring device 20 continuously satisfies a predetermined standard, or It can be configured so that the user can make such a determination based on the air volume measuring device 20 .

In this way, the performance evaluation of the air volume and the performance evaluation of the fine dust leakage rate of the mobile negative pressure machine can be configured as separate performance evaluation devices, but at least one integrated performance evaluation device sharing the test duct and the flow rate measuring device. It can also be configured as

After confirming that the particle concentration supply is stable (4), the concentration of test particles is measured at the front and rear ends of the test duct, respectively. The upstream and downstream particle concentrations can be measured alternately or simultaneously. In case of alternating measurement, it is necessary to measure at unequal timing, so pay attention to the fluctuation of the upstream concentration. The accuracy of the measurement can be further improved by correcting the error between the two.

Finally, (5) the leak rate is calculated based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured in the concentration measuring unit, and it is determined whether the calculated leak rate satisfies a predetermined standard. , the fine dust leakage rate is calculated by the following formula.

Here, L is the leak rate (%), C _o is the concentration of test particles at the rear end (pieces/ml), and C _i is the concentration of test particles at the front end (pieces/ml).

In the case where the measured microparticle leak rate is, for example, 0.05% or less, it will be able to be distributed in the market as a mobile negative pressure device that has passed the performance evaluation. At this time, the standard of 0.05% is taken into consideration when the HEPA filter standard is 0.03% or less, and the minimum leakage rate that occurs when an actual HEPA filter is installed and the performance of a mobile negative pressure device is evaluated.

In summary, according to the apparatus and method for evaluating the performance of the portable negative pressure device of the present invention, it is possible to easily determine whether the portable negative pressure device meets the evaluation criteria and the authentication system.

In addition, according to the apparatus and method for evaluating the performance of a portable negative pressure device of the present invention, a portable negative pressure device that meets the evaluation criteria and certification system of the portable negative pressure device is supplied to the market, thereby preserving and improving the health of the public.

Terms used in this specification generally are intended to be "open-ended" terms, particularly in claims (eg, the body of claims) (eg, "comprising" means "including but not limited to" , "having" should be construed as "having at least more" and "comprising" as "including but not limited to" It is expressly recited in the claims, and in the absence of such recitation, no such intent is understood.

Only specific features of the invention have been shown and described herein, and various modifications and variations will occur to those skilled in the art. It is therefore to be understood that the claims are intended to cover changes and modifications that fall within the spirit of the present invention.

1: Mobile negative pressure device 6: Differential pressure maintenance damper
10: test duct 20: air volume measurement device
30: blow fan 50: perforated plate
60: pressure gauge 70: concentration measuring unit
80: test particle generator

Claims (9)

A test duct comprising a front end and a rear end with respect to the movable negative pressure machine, and the pressure in the test duct by the movable negative pressure machine is checked using the pressure gauge, and ;
a test particle supply unit configured to supply test particles to be supplied into the test duct, wherein the test particles include KCl particles;
a concentration measuring unit configured to measure the concentration of each test particle at the front end and the rear end; and
Comprising a performance evaluation unit that calculates a leak rate based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured by the concentration measuring unit, and determines whether the calculated leak rate satisfies a predetermined standard,
Portable negative pressure device performance evaluation device. The method of claim 1,
The test particle supply unit includes a test particle generating unit configured to generate test particles, and a test particle diffusion unit disposed at the front end and configured to evenly distribute the test particles to the front end,
Portable negative pressure device performance evaluation device. 3. The method of claim 2,
The test particle generator includes a compressed air supply for supplying compressed air, a spraying device for spraying a 1 mass % KCl aqueous solution together with the compressed air in the form of an aerosol, and drying and removing water vapor from the aerosol generated by the spraying device. A diffusion dryer comprising:
Portable negative pressure device performance evaluation device. 4. The method of claim 3,
The test particle diffusion unit includes a spraying device for spraying the test particles to the opposite side of the movable negative pressure device, a circulation fan disposed on the bottom of the front end, and a perforated plate sequentially in the direction from the front end to the rear end,
Portable negative pressure device performance evaluation device. 5. The method according to any one of claims 1 to 4,
The predetermined criterion is 0.05% or less,
Portable negative pressure device performance evaluation device. 6. The method of claim 5,
The mobile negative pressure device, characterized in that it includes a HEPA filter,
Portable negative pressure device performance evaluation device. 7. The method of claim 6,
The concentration measuring unit, including a light scattering type automatic particle counter,
Portable negative pressure device performance evaluation device. 8. The method of claim 7,
The concentration measuring unit calculates the average of the concentrations collected from at least five sampling locations in order to measure the concentration of the test particles at the rear end,
Portable negative pressure device performance evaluation device. In the performance evaluation method using the mobile negative pressure device performance evaluation device according to claim 6,
Mounting a mobile negative pressure device to be evaluated for performance in the test duct;
checking the pressure in the test duct by the movable negative pressure machine;
supplying test particles to be supplied into the test duct;
Measuring the concentration of each test particle at the front end and the rear end; and
Calculating a leak rate based on the concentration of the test particles at the front end and the concentration of the test particles at the rear end measured by the concentration measuring unit, and determining whether the calculated leak rate satisfies a predetermined criterion,
A method for evaluating the performance of a portable negative pressure device.

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