CN210903775U - Negative pressure screen and purification integrated sickbed - Google Patents
Negative pressure screen and purification integrated sickbed Download PDFInfo
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- CN210903775U CN210903775U CN201921379432.2U CN201921379432U CN210903775U CN 210903775 U CN210903775 U CN 210903775U CN 201921379432 U CN201921379432 U CN 201921379432U CN 210903775 U CN210903775 U CN 210903775U
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Abstract
The utility model discloses a negative pressure screen, which comprises a main body welding piece, an air inlet device, a purifying device and a negative pressure forming device; the main body welding part comprises a main body front frame and a main body middle frame, and the main body front frame and the main body middle frame are integrally connected; the air inlet device is positioned in the main body middle frame and is of a plate-shaped frame structure; purifier with negative pressure forming device all install in inside the main part front frame, just negative pressure forming device has two, install respectively in purifier's the left and right sides, negative pressure screen compact structure, save consumptive material, reduce cost through the design to hot blast blowpipe apparatus, can purify the killing in sucking the negative pressure screen with the gaseous whole of utensil latent risk pollution of patient's exhalation as far as possible.
Description
Technical Field
The utility model relates to an air purification technical field especially relates to a negative pressure screen and purification integral type sick bed.
Background
The main transmission routes of pathogens include air and droplet transmission.
Airborne transmission mainly uses air as a transmission medium, and the transmission of diseases caused by the flow of microparticles with pathogenic microorganisms in the air along with airflow is one of the main ways of causing upper respiratory tract and lower respiratory tract infection. Can cause infection of many people and even cause nosocomial infection outbreak. Tuberculosis, measles, chickenpox cause the occurrence or outbreak of nosocomial infections mainly through airborne transmission.
The transmission of droplets is mainly caused by coughing, sneezing or laughing, especially droplets produced by patients with respiratory infectious diseases, which contain respiratory mucosal secretions and a large number of pathogenic microorganisms and cause infection by inhalation when susceptible persons are in close contact with the droplets. Such as influenza B virus, adenovirus, meningococcus, streptococcus, Bordetella pertussis, group A hemolytic streptococcus, and the like.
At present, hospitals mainly have the following measures for air and spray transmission: (1) emphasis on respiratory hygiene and cough amenities; (2) medical care personnel or visiting personnel wear isolation clothes and protective clothes to carry out personal protection; (3) the isolation is carried out by adopting modes such as 'single isolation room' and the like.
The technology and products in the field of nosocomial infection prevention and control are still in a state to be perfected, and at present, products similar to the technology and products are few and mainly positive pressure screens. The existing positive pressure screen product adopts circulating purification, namely only the air volume and space are considered for purification, and the treatment still can cause cross infection in a room. Although a very small amount of negative pressure sickbed products adopt timely purification and sterilization, namely a negative pressure area is designed at the position of a pollution source to timely absorb polluted air, the negative pressure sickbed still has the problems of non-matching with standard settings such as hospital equipment belts and the like, noise, inconvenience in use and the like.
Therefore, the negative pressure screen which is small and exquisite in size, occupies small space and is matched with standard settings such as hospital equipment belts is urgently needed to be developed.
SUMMERY OF THE UTILITY MODEL
Based on the not enough of above-mentioned prior art, the utility model provides a negative pressure screen and use on purifying integral type sick bed thereof. The utility model discloses a negative pressure screen compact structure, maximize absorb gaseous pollutants, small in noise, disappear and kill fully, the air current is balanced, can be used to the institute and feel the prevention and control field, especially are used for purifying in the aspect of the integral type sick bed.
The utility model discloses a technical scheme for solve technical problem as follows:
the utility model discloses a negative pressure screen, which comprises a main body welding piece, an air inlet device, a purification device and a negative pressure forming device; the main body welding part comprises a main body front frame and a main body middle frame which are integrally connected; the air inlet device is positioned in the middle frame of the main body and is of a plate-shaped frame structure; the purification device and the negative pressure forming device are both arranged inside the front frame of the main body, and the two negative pressure forming devices are respectively arranged on the left side and the right side of the purification device.
Preferably, the air intake device comprises a ventilation pore plate, a ventilation pipeline and an air channel cover plate; the ventilation pore plate, the ventilation pipeline and the air duct cover plate are sequentially and tightly connected from front to back and are arranged in the main body middle frame.
Furthermore, a middle air inlet is arranged in the middle of the ventilation pore plate, and side air inlet holes are arranged at the edge of the ventilation pore plate; the ventilation pipeline and the ventilation pore plate are sealed and combined into an open semi-frame pipeline; the side air inlet hole is positioned in the ventilation pipeline, and the middle air inlet is positioned outside the ventilation pipeline; the inner side wall of the ventilation pipeline is enclosed into a hollow funnel shape, and the opening of the funnel is downward; the air outlet of the ventilation pipeline is provided with an air channel baffle.
Furthermore, the ventilation pipeline is provided with two air outlets, and the areas of the air outlets are equal.
Furthermore, the ratio of the area of the opening of the funnel to the area of the air outlet is 3: 1.
Further, the inside wall comprises double-deck orifice plate formula wall, place sound insulation material in the middle of the double-deck orifice plate formula wall.
Further, the purification device is sequentially provided with a primary filter screen, an electrostatic device and an ozone decomposition screen from top to bottom, and the bottom of the purification device is also provided with a flow equalizing plate.
Furthermore, the flow equalizing plate is a strip-shaped plate with a broken line type cross section.
The second purpose of the utility model is the application of the negative pressure screen in the hospital sensing prevention and control field.
The third purpose of the utility model is that on the basis of the first and second purposes, the utility model discloses a purify integral type sick bed, including the bed body and aforementioned negative pressure screen, the head of a bed end of the bed body is placed on the main part front frame of negative pressure screen.
The working principle is as follows:
when the negative pressure screen works, under the action of the negative pressure forming device, the gas exhaled by the patient with potential risk is sucked into the negative pressure screen through the air inlet device and enters the purifying device through the air outlet of the air inlet device; then in the purification device, the gas passes through multiple filter screens of the purification device and is divided to fans in the negative pressure forming devices at the left side and the right side through a flow equalizing plate; then the air passes through the high-efficiency filter screen under the action of the fan, and finally clean air is blown out from two sides of the front frame of the main body.
Has the advantages that:
(1) the whole structure is compact:
the utility model discloses a negative pressure screen mainly includes air inlet device, purifier and negative pressure forming device, through the utility model discloses a main part seam piece for the locating position, interconnect relation, the overall structure of above-mentioned three device are more compact.
a. The height of the negative pressure screen is reduced, and the negative pressure screen is matched with the use of a hospital equipment belt;
b. the negative pressure screen of the utility model is a plate-shaped frame structure, the thickness is reduced, the appearance is more beautiful, and the occupied space can be reduced;
c. the utility model discloses a negative pressure screen compact structure, save consumptive material, reduce cost.
(2) Preventing the polluted air from diffusing:
a. the ventilation pore plate in the air inlet device of the utility model is provided with the middle air inlet and the side air inlet, which increases the air suction area, thereby being capable of sucking all the gas with potential risk pollution exhaled by the patient into the negative pressure screen as much as possible for purification and sterilization;
b. form two supplementary wind channels through air pipe, closely cover through ventilation orifice plate, air pipe and wind channel apron three closes, forms main wind channel, and this kind of main wind channel and the mode that supplementary wind channel cooperation was used can prevent the contaminated air diffusion better: most of the polluted air exhaled by the patient is sucked away through the main air duct, and the residual polluted air which is not sucked away is sucked away through the auxiliary air duct;
c. the area ratio of the air ports of the auxiliary air duct and the main air duct is 1: 3; the main air duct is funnel-shaped, and the air outlet of the auxiliary air duct is provided with an air duct baffle plate so that the area of the air outlet is smaller; under the effect of the negative pressure forming device, under the condition that the air flow is the same, the narrower place of the air channel is, the larger the air speed is, and the smaller the pressure intensity is, the air intake device, the main air channel is funnel-shaped, and the arrangement of the air channel outlet position of the air intake device can lead the pressure intensity of the air channel outlet to become smaller, thereby improving the pressure intensity difference between the outside air and the main air channel, and finally achieving the purpose of improving the air suction effect of the main air channel; for the auxiliary air duct air outlet, the area of the auxiliary air duct air outlet is reduced by arranging the air duct baffle, so that the pressure intensity of the auxiliary air duct air outlet is reduced, the pressure intensity difference between the outside air and the inside of the auxiliary air duct is increased, and the effect of improving the air suction of the auxiliary air duct is achieved.
(3) The noise is small:
a. the inner side wall of the ventilation pipeline of the utility model is composed of double-layer pore plate type wall surfaces, which can gradually reduce the pressure of the wall surfaces from high to low, and the pressure of the wall surfaces is stably released, so that the flow speed of fluid on the wall surfaces is slowed down, and the noise is reduced;
b. the silencing material is arranged inside the wall surface of the double-layer pore plate and can obviously absorb sound;
c. silencing material installs inside hot blast blowpipe apparatus, uses the utility model discloses during the negative pressure screen, people's head is nearer with the negative pressure screen, consequently, can show the noise that reduces patient's head position, promotes patient's comfort level.
(4) The killing effect is improved:
because the lower part of the purification device is provided with the flow equalizing plate, the flow equalizing plate has the function of improving the killing efficiency, and the resistance on gas flowing through the flow equalizing plate is large, so that the flow velocity is reduced, the flow velocity of the air flowing through the purification device is more uniform, the air can be more fully contacted with the filter screen, and the purification effect is optimized; the flow equalizing plate is simple in structure, easy to process and low in cost, and can thoroughly sterilize and purify polluted gas in various ways.
(5) And (3) airflow balance:
a. the negative pressure forming device is arranged at both sides of the purifying device, so that the left side and the right side of the main air duct and the auxiliary air duct both generate uniform suction;
b. the areas of the auxiliary air duct air ports on the left side and the right side of the air inlet device are equal, and under the condition that the power of the fans on the left side and the right side is equal, the negative pressure values of the auxiliary air ducts on the left side and the right side are almost equal, so that the air flow can be stabilized;
c. the bottom of the purifying device is provided with a flow equalizing plate, so that the gas from the purifying device can uniformly enter the negative pressure forming devices at two sides, and the disorder of the gas flow in the instrument is avoided;
d. in the negative pressure forming device, the rear part of the fan is provided with an air deflector and a fan guide ring, and the air deflector can guide the wind direction of the fan and also can enable the airflow to face a fixed direction.
(6) Reducing oppression:
the traditional sick bed of keeping apart adopts is that the cover-type structure can bring oppression for patient and feels, and the utility model discloses a platelike negative pressure screen, when patient lies on the sick bed, the head top can not have any shielding object, can not bring oppression for patient to promote patient's comfort level.
Drawings
FIG. 1 is a schematic view of a negative pressure screen;
FIG. 2 is a schematic structural view of a main body seam in the vacuum panel;
FIG. 3 is a rear view of the disassembled air intake device
FIG. 4 is a schematic side view of the inner side of the intake assembly;
FIG. 5 is a schematic sectional view of the purification apparatus;
FIG. 6 is a schematic sectional view of the negative pressure forming apparatus;
FIG. 7 is a schematic view of a decontamination integrated hospital bed;
FIG. 8-1 is a front view of the air intake device when the negative pressure screen is not divided into the main air duct and the auxiliary air duct;
FIG. 8-2 is a bottom view of the air intake device when the negative pressure screen does not separate the main air duct and the auxiliary air duct;
fig. 8-3 shows the area of the air outlet of the left auxiliary air duct: area of hollow opening of main air duct: the area of the air outlet of the right auxiliary air duct is 1: 2: 1, a front view of an air inlet device;
fig. 8-4 shows the area of the air outlet of the left auxiliary air duct: area of hollow opening of main air duct: the area of the air outlet of the right auxiliary air duct is 1: 2: 1, bottom view of an air inlet device;
fig. 8-5 shows the area of the air outlet of the left auxiliary air duct: area of hollow opening of main air duct: the area of the air outlet of the right auxiliary air duct is 1: 3:1, a front view of an air inlet device;
fig. 8-6 show the area of the air outlet of the left auxiliary air duct: area of hollow opening of main air duct: the area of the air outlet of the right auxiliary air duct is 1: 3:1, bottom view of an air inlet device;
FIG. 9-1 is a front view of a single side fan suction screen;
FIG. 9-2 is a front view of a double sided blower negative pressure screen;
FIG. 10-1 is a left side view of a decontamination integrated hospital bed;
fig. 10-2 is a top view of a decontamination integrated hospital bed.
1. A main body welding part 11, a main body front frame 12 and a main body middle frame; 15. a high-efficiency filter screen;
2. the air inlet device 21, the ventilation pore plate 22, the ventilation pipeline 23, the air channel cover plate 211, the middle air inlet 212, the side air inlet hole 221, the inner side wall 222, the air channel baffle 223, the hollow opening 224, the air outlet 2211, 2212 and the double-layer pore plate type wall surface;
3. a purification device 31, a primary filter screen 32, an electrostatic device 33 and an ozone decomposition screen;
4. a negative pressure forming device 41, a fan fixing support 42, a shockproof rubber pad 43 and a fan;
5. a bed body;
6. a flow equalizing plate;
7. and a negative pressure screen air outlet.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention; it is to be understood that the embodiments described are only some embodiments of the invention, and 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 present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the preferred embodiment of the present invention, it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the principles of the present invention, and these modifications and variations are also considered as the protection scope of the present invention.
Negative pressure screen overall structure:
fig. 1 is a schematic structural view of a negative pressure panel according to the present embodiment; FIG. 2 is a schematic view of a main body seam in the vacuum panel.
As shown in fig. 1 and 2, the negative pressure screen includes a main body welding part 1, an air intake device 2, a purification device 3 and a negative pressure forming device 4; the main body welding part 1 comprises a main body front frame 11 and a main body middle frame 12, wherein the main body front frame 11 and the main body middle frame 12 are integrally connected; the air inlet device 2 is positioned in the main body middle frame 12, and the air inlet device 2 is of a plate-shaped frame structure; the purifying device 3 and the negative pressure forming device 4 are both installed inside the main body front frame 11, and two negative pressure forming devices 4 are respectively installed on the left side and the right side of the purifying device 3. Under the connecting action of the main body welding part 1, the air intake device 2, the purification device 3 and the negative pressure forming device 4 form an air path consisting of the air intake device 2 → the purification device 3 → the negative pressure forming device 4.
The utility model discloses a negative pressure screen passes through main part seam piece 1 for the locating place, interconnect relation, overall structure of hot blast blowpipe apparatus 2, purifier 3 and the three device of negative pressure forming device 4 are more compact.
Air inlet device:
FIG. 3 is a schematic rear view of the disassembled air intake device; FIG. 4 is a side view of the inner side of the intake assembly. As shown in fig. 3 and 4, the air intake device 2 includes a ventilation hole plate 21, a ventilation duct 22 and an air duct cover plate 23; the ventilation orifice plate 21, the ventilation pipeline 22 and the air duct cover plate 23 are closely connected from front to back in sequence and are arranged in the main body middle frame 11.
The middle position of the ventilation orifice plate 21 is provided with a middle air inlet 211, and the edge of the ventilation orifice plate 21 is provided with a side air inlet 212. The ventilation pipeline 22 and the ventilation pore plate 21 are sealed and combined into an open semi-frame pipeline; the side air inlet holes 212 are located inside the ventilation duct 22, and the middle air inlet 211 is located outside the ventilation duct 22. The inner side wall 221 of the ventilation pipeline 22 is enclosed into a hollow funnel shape, and a hollow opening 223 is downward to form a main air duct opening; the air outlet 224 of the ventilation duct 22 is provided with an air duct baffle 222. The ventilation duct 22 has two air outlets 224, which form an auxiliary air duct opening, and the areas of the air outlets 224 are equal. The ratio of the area of the hollow opening 223 to the area of the air outlet 224 is 3: 1. The inner wall 221 is formed of two perforated panel walls 2211 and 2212, and a sound insulating material is disposed between the two perforated panel walls 2211 and 2212.
A purification device:
FIG. 5 is a schematic sectional view of the purification apparatus; as shown in fig. 5, the purification device 3 is sequentially provided with a primary filter screen 31, an electrostatic device 32 and an ozone decomposition screen 33 from top to bottom, and the bottom of the purification device 3 is provided with a flow equalizing plate 6; the flow equalizing plate 6 is a strip-shaped plate with a broken line type cross section. As shown in fig. 2, a high-efficiency filter screen 15 is further disposed behind the negative pressure screen air outlet 7 to ensure that the exhausted air is clean.
Negative pressure forming device:
FIG. 6 is a schematic sectional view of the negative pressure forming apparatus; as can be seen from fig. 6, the negative pressure forming device 4 includes a blower fixing bracket 41, a cushion 42 and a blower 43; the fan fixing bracket 41 is internally provided with a shockproof rubber pad 42 and a fan 43 in sequence, and the negative pressure forming device 4 is fixed at the left side and the right side of the purifying device 3 through the fan fixing bracket 41.
Purify integral type sick bed:
fig. 7 is a schematic structural view of a decontamination integrated hospital bed. The sick bed includes the bed body 5 and the utility model discloses a negative pressure screen, 5 one end of the bed body are placed on the main part front frame 11 of negative pressure screen.
The utility model discloses a fan is hypsokinesis centrifugal fan, and the characteristics of this kind of fan are that occupation of land space is little, can reach the utility model discloses require the requirement that occupation of land space is little.
The utility model discloses an effect of negative pressure screen:
1. the utility model discloses a negative pressure screen compact structure.
The utility model discloses the length of negative pressure screen: 1232mm, wide: 365mm, high: 1150mm and 1200mm from the lowest surface of the hospital equipment with standard height to the ground. Therefore, the height of the negative pressure screen of the utility model is matched with the use of the hospital equipment belt, and meanwhile, because the negative pressure screen has a plate-shaped frame structure, the thickness is reduced, the appearance is more beautiful, and the occupied space can be reduced; saving material consumption and reducing cost.
2. The utility model discloses an air inlet device can maximize prevent the contaminated air diffusion.
As mentioned above, the ventilation hole plate 21 of the air intake device 2 is provided with the middle air inlet 211 and the side air inlet 212 to increase the air intake area, so that the air exhaled by the patient and having potential risk pollution can be sucked into the negative pressure screen as much as possible for purification and disinfection; form two supplementary wind channels through ventilation pipe 22, close through ventilation orifice plate 21, ventilation pipe 22 and 23 three's of wind channel apron lid, form main wind channel, this kind of main wind channel and the mode that supplementary wind channel cooperation was used can prevent the contaminated air diffusion better: most of the polluted air exhaled by the patient is sucked away through the main air duct, and the residual polluted air which is not sucked away is sucked away through the auxiliary air ducts on the periphery.
The auxiliary air duct air outlet 224 is provided with an air duct baffle 222 so that the air outlet area is smaller; under negative pressure forming device 4's effect, that is to say under the unchangeable condition of pressure, the air outlet area is less, and the pressure that can produce just is big more, and the pressure in air suction opening department just is big more to can promote the wind channel effect of breathing in by a wide margin when not changing negative pressure forming device power. In the utility model, the ratio of the area of the main air duct air port to the area of the auxiliary air duct air port is preferably 3: 1.
Different air ducts are tested for air suction effect:
detection of 1 group: for example, fig. 8-1 is a schematic diagram of the wind speed detection points of the instrument when the negative pressure screen is not divided into the main wind channel and the auxiliary wind channel, the detection points are 1 c-12 c, respectively, and fig. 8-2 is a bottom view of the wind channel when the negative pressure screen is not divided into the main wind channel and the auxiliary wind channel.
Detection of 3 groups: fig. 8-5 are schematic diagrams of wind speed detection points of the instrument when the negative pressure screen divides the main air duct and the auxiliary air duct, the detection points are 1e to 12e respectively, and the area of the air outlet of the auxiliary air duct on the left side of the left auxiliary air duct of the air intake device of the apparatus is as follows: area of hollow opening of main air duct: the area of the air outlet of the right auxiliary air duct is 1: 3:1, as shown in fig. 8-6.
Under the condition that the power of the fans is equal, the wind speeds at the wind speed detection point positions are respectively detected, and the result is shown in table 1.
TABLE 1 wind speed test data
According to GB/T18801-2015, through experimental detection, when the wind speed approaches 2m/s, the isolation effect can meet the standard requirement.
Therefore, the utility model discloses a reach the standard requirement, main wind channel wind speed is close 2m/s, under the condition that does not increase fan power, through the setting of baffle, can show the wind speed that promotes the main wind channel wind gap, can know from table 1 data, when main wind channel cavity opening and auxiliary air channel air outlet area are 3:1, the effect of promoting main wind channel wind gap wind speed is the best.
As the air port of the main air duct is used as a main suction position and most polluted air is sucked away, the requirement can be met only by the air speed of the auxiliary air duct being close to 0.5 m/s.
3. The utility model discloses a mode of air pipe installation amortization material makes the utility model discloses the noise of equipment reduces.
The inner side wall of the ventilation pipeline of the utility model is composed of double-layer pore plate type wall surfaces, which can gradually reduce the pressure of the wall surfaces from high to low, and the pressure of the wall surfaces is stably released, so that the flow speed of fluid on the wall surfaces is slowed down, and the noise is reduced; the silencing material is arranged inside the wall surface of the double-layer pore plate and can obviously absorb sound; silencing material installs inside hot blast blowpipe apparatus, uses the utility model discloses during the negative pressure screen, people's head is nearer with the negative pressure screen, consequently, can show the noise that reduces patient's head position, promotes patient's comfort level.
As shown in fig. 10-1-10-2, the utility model discloses add the noise reduction device to ventilation hole department and add the noise reduction device to air outlet department and carry out the comparison, specifically detect the position and detect for the position 150mm apart from the bedside height, apart from the negative pressure screen 180 mm. The results are shown in Table 2.
TABLE 2 purification Integrated isolation sickbed noise test data
The experiment of table 2 proves that the effective noise reduction of the device of making an uproar can be installed additional to vent department, and the air outlet department installs the device of making an uproar additional and does not play obvious noise reduction effect.
3. Flow equalizing plate can promote the utility model discloses purifier's efficiency of killing that disappears
The resistance that receives when the gas flow through the flow equalizing plate is big to reduced the velocity of flow, made the air flow rate in the purifier of flowing through more even, can make the air more abundant with the filter screen contact, optimized purifying effect. The flow equalizing plate is simple in structure, easy to process and low in cost, and the specific test effect is as follows.
3.1. Particulate matter PM2.5 purification efficiency detection
PM2.5 purification efficiency detection is carried out according to GB/T18801-2015.
3.1.1. Detecting an object
Cigarette smoke (less than or equal to 2.5 mu m).
3.1.2. Test conditions
Ambient temperature: (20 to 25 ℃).
Ambient humidity: (50-70)% RH.
3.1.3. Test apparatus
Test chamber (30 m)3) And a dust tester (TSI 8530).
3.1.4. Machine operating conditions
The test process starts high-grade and high-pressure.
3.1.5. Test procedure
(1) And placing the sample machine to be tested into the test cabin, connecting a power supply, checking to operate normally, and then closing the sample machine.
(2) Starting a background concentration and environment temperature and humidity control system, and controlling the concentration of the particulate matters with the background concentration of more than 0.3 mu m to be less than 1X104And (2) the temperature and the humidity reach the specified state of the test.
(3) The standard cigarette for ignition test is placed in a generator, and the initial concentration is controlled to be (5.0 +/-1.0) mg/m3Within range, cigarette smoke is stopped. The mixing ceiling fan continued stirring for 2min to uniformly mix the PM2.5 concentration in the test chamber.
(4) After turning off the mixing fan for 3min, the concentration of PM2.5 was measured.
(5) And starting a prototype to be inspected, continuously purifying for 60min, and measuring the concentration of PM2.5 in the cabin.
(6) And (5) testing the natural attenuation without opening a sample machine according to the steps (1) to (5).
3.1.6. Formula for calculation
Natural rate of decay
(C0 'is the initial concentration of the control group, Ct' is the final concentration of the control group);
purification efficiency
(C0 is the initial concentration of the test group and Ct is the final concentration of the test).
According to the PM2.5 purification efficiency detection method for particulate matter, the PM2.5 purification efficiencies of the negative pressure panel without the flow equalization plate and the negative pressure panel with the flow equalization plate were respectively detected, and the results are shown in table 3.
TABLE 3 PM2.5 purification efficiency
As can be seen from the data in Table 3, after the flow equalizing plate is installed, the purification efficiency of PM2.5 is improved from 99.01% to 99.95%, so that the purification efficiency is obviously improved.
3.2. Test detection of degerming Rate
3.2.1. Detection method
GB 21551.3-2010 domestic and similar uses electrical apparatus antibiotic, degerming, special requirement appendix A of purification function air purifier.
3.2.2. Test strains
Staphylococcus albus 8032.
3.2.3. Test conditions
1) Ambient temperature: (20-25) DEG C.
2) Ambient humidity: (50-70)% RH.
3.2.4. Test apparatus
Test chamber (30 m)3) The device comprises a six-level sieve pore air impact type sampler (FA-1), a microbial aerosol generator and a nutrient agar culture medium.
3.2.5. Machine operating conditions
The test process starts high-grade and high-pressure.
3.2.6. Formula for calculation
Natural rate of extinction
(V0 is air bacteria content before control test, Vt is air bacteria content after control test);
bacteria removal rate
(V1 is air bacteria content before test in test group, V2 is air bacteria content after test in test group).
According to the above detection method, it is right that the utility model discloses under the even stream board of instrument installation and the even stream board condition of not installing, the degerming rate of detecting instrument, the result is shown in table 4.
TABLE 4 Sterilization Rate test data
As can be seen from the data in Table 4, after the flow equalization plate is installed, the sterilization rate of the negative pressure screen is increased from 99.21% to 99.92%, and the sterilization rate of the negative pressure screen is remarkably improved.
To the negative pressure screen, the degerming rate is promoted to 99.92% from 99.21% and is very difficult, the utility model discloses an at purifier lower part installation flow equalizing plate, slow down the wind speed of flowing through purifier, let take the fungus gas and purifier can fully contact to promote the degerming efficiency of negative pressure screen, obtained the effect that the intention is not.
4. The utility model discloses a purifier can maximize promote microorganism and particulate matter separation efficiency, disappear and kill efficiency.
Negative pressure screen has carried out unique design to hot blast blowpipe apparatus, can reach the whole negative pressure screens of inhaling of contaminated air of disease exhalation, simultaneously the utility model discloses a purifier sets up multistage filtration, thoroughly disappears to the contaminated gas through multiple mode and kills and purifies, purifier lower part installation flow equalizing plate, the resistance that receives when the gas flow flows through the flow equalizing plate is big, thereby reduced the velocity of flow, make the air flow rate in the purifier of flowing through more even, can make more abundant of air contact filter screen, thereby make contaminated air discharge after purification through fully killing inside the purifier, with the cleanliness factor of guaranteeing exhaust gas, thereby reach good separation effect.
The flow equalizing plate is simple in structure, easy to process and low in cost. According to detection standard GB/T18801-2015, the following negative pressure screen purification effects of not installing and installing the flow equalizing plate are compared:
4.1. microbial barrier efficiency detection data
4.1.1. Test strains
Mycobacterium bovis BCG (Mycobacterium bovis BCG).
4.1.2. Detection conditions
1) Ambient temperature: (20 to 25 ℃).
2) Ambient humidity: (50-70)% RH.
4.1.3. Test apparatus
Test chamber (30 m)3) The device comprises a six-level sieve pore air impact type sampler (FA-1), a microbial aerosol generator and a 7H11 culture medium.
4.1.4. Machine operating conditions
The test process starts high-grade and high-pressure.
4.1.5. Test procedure
1) The prototype to be tested was placed at 30m3In the test chamber, the sample machine is adjusted to the test working state, the test operation is normal, and then the sample machine is closed.
2) Arranging a microorganism aerosol generator in the middle of a 20cm position of a head of a prototype bed to simulate the breathing position of a patient, and arranging a sampling point 30cm above the microorganism aerosol generator as an initial point of microorganism concentration, wherein the initial point is marked as V0; in addition, a microorganism concentration sampling point, designated as Vi (1, 2, 3 … …), was provided at a distance of 0.5m and a height of 1.5m around the prototype (front, right, left and rear).
3) And opening the negative pressure screen, purifying air in the cabin, and simultaneously starting the temperature and humidity control device to enable the humidity in the cabin to reach a test specified state.
4) Starting a negative pressure screen purification function, starting the microbial aerosol generator after the stable operation is carried out for 10min, continuously generating for 20min, simultaneously sampling each point, recording data every 5min, stopping sampling after continuous testing for 20min, and ending the test.
5) Setting a comparison group, and repeating 3) to 4) without starting the purification function of the prototype.
4.1.6. Formula for calculation
Efficiency of natural barrier
(V0 'is the mean value of the concentration at the initial point of the control group, and Vi' is the mean value of the concentration at all points around the control group).
Barrier efficiency
(V0 is testThe concentration average value of the initial point of the test group, and Vi is the concentration average value of all the points around the test group).
TABLE 5 detection data for microbiological barrier efficiency
Can know by table 5 data, purify integral type isolation sick bed microorganism separation efficiency and reach more than 98.77%, have very good separation effect, avoid the pathogenic bacteria diffusion of patient's exhalation on the sick bed to can disappear and kill the pathogenic bacteria.
4.2. Particulate matter (not less than 0.3 mu m) blocking efficiency detection
4.2.1. Test object
Cigarette smoke (≧ 0.3 μm)
4.2.2. Detection conditions
1) Ambient temperature: (23 to 27 ℃ C.)
2) Ambient humidity: (40-60)% RH
4.2.3. Test apparatus
Test chamber (30 m)3) A high concentration particle counter (SX-L301N), a laser dust particle counter (LZJ-01D), a particle diluter (SX-D100)
4.2.4. Machine operating conditions
High-grade and high-pressure opening in test process "
4.2.5. Test procedure
1) Placing the sample machine to be detected at 30m3In the test chamber, the sample machine is adjusted to a test running state, the test running is normal, and then the sample machine is closed.
2) Arranging a cigarette generator smoke release port in the middle of a 20cm position of a head of a prototype machine to simulate the breathing position of a patient, and arranging a sampling point 30cm above the cigarette generator smoke release port as an initial point of the concentration of particulate matters, wherein the initial point is marked as C0; in addition, sampling points were set at a distance of 0.5m and a height of 1.5m around the prototype (front, right, left, and rear), as sampling points of particulate matter concentration (front, right, left, and rear), and are denoted as Ci (1, 2, 3, … …).
3) And opening the negative pressure screen, purifying air in the cabin, and simultaneously starting the temperature and humidity control device to enable the temperature and humidity in the cabin to reach a test specified state.
4) And (5) reducing the background concentration of the particles in the cabin to a proper level, closing the negative pressure screen and the temperature and humidity device, and recording the background concentration value.
5) Starting the purification function of the prototype, starting the cigarette generator after the stable operation is carried out for 10min, continuously generating for 30min, simultaneously sampling at each point, recording data every 2min, stopping sampling after continuously testing for 30min, and ending the test.
6) Setting a comparison group, and repeating the steps 3) to 5) without starting the purification function of the prototype.
4.2.6. Formula for calculation
Efficiency of natural barrier
(C0 'is the average value of the concentration of the initial point of the control group, and Ci' is the average value of the concentration of all the points around the control group);
barrier efficiency
(C0 is the mean concentration at the initial point of the test group and Ci is the mean concentration at each of the four peripheral points of the test group).
Table 6 particulate matter blocking efficiency detection data
Can know by table 6 data, purify integral type isolation sick bed particulate matter separation efficiency and reach more than 98.44%, have very good separation effect to the particulate matter.
To sum up, purify integral type sick bed, the pollution of the gas of effective separation patient exhalation to the air to reach the effect of avoiding the cross infection between patient and patient, patient and the healthy people.
5. Balancing the airflow
The negative pressure forming device is arranged at both sides of the purifying device, so that the left side and the right side of the main air duct and the auxiliary air duct both generate uniform suction; the areas of the auxiliary air duct air ports on the left side and the right side of the air inlet device are equal, and under the condition that the power of the fans on the left side and the right side is equal, the negative pressure values of the auxiliary air ducts on the left side and the right side are almost equal, so that the air flow can be stabilized; the bottom of the purifying device is provided with a flow equalizing plate, so that the gas from the purifying device can uniformly enter the negative pressure forming devices at two sides, and the disorder of the gas flow in the instrument is avoided; in the negative pressure forming device, the rear part of the fan is provided with an air deflector and a fan guide ring, and the air deflector can guide the wind direction of the fan and also can enable the airflow to face a fixed direction.
The detection method comprises the following steps:
detecting the wind speed of the unilateral fan: the wind speed detection is carried out on 9 detection points with equal distance from left to right of the air inlet of the main wind channel, wherein the detection points are 1 a-9 a respectively, as shown in figure 9-1, and the detection results are shown in table 7.
And (3) detecting the wind speed of the bilateral fan: the wind speed detection is carried out on 9 detection points which are equidistant from the air inlet of the main wind channel from left to right and are 1 b-9 b respectively, as shown in figure 9-2, and the detection results are shown in table 7.
The fan types used for the single-side fan detection and the double-side fan detection are the same in rotating speed.
TABLE 7 comparison of wind speed balance for purification integrated hospital bed
As can be seen from Table 7, the air speeds of the air inlets of the double-side fans are all about 2 m/s; and the fan is arranged on one side, the wind speed on one side close to the fan reaches 2.76m/s, the lowest value of the wind speed of the air inlet on the side far away from the fan is 1.23m/s, and the wind speed is unbalanced.
The fans are arranged on the two sides, so that the air speed at the air inlet position can be balanced, the gas exhaled by a patient can be prevented from diffusing, and the polluted gas can be sucked into the negative pressure screen to the maximum extent.
The negative pressure screen is applied to the field of hospital infection prevention and control, is arranged on the head of a patient and is used for purifying gas exhaled by an infected patient. The negative pressure screen is used together with a sickbed to form a purification integrated sickbed, and the head end of the sickbed is placed on the front frame 11 of the main body. Purify integral type sick bed and be applied to hospital and feel prevention and control technical field, the patient head is close to the negative pressure screen during the use, and the gas of infectious victim exhalation is purified to the negative pressure screen.
To sum up, the utility model discloses can provide possess compact structure, maximize absorption gaseous pollutants, small in noise, disappear and kill abundant, the balanced negative pressure screen of air current to the institute feels the prevention and control field, especially is used for purifying in the aspect of the integral type sick bed.
The embodiments are merely examples in any sense and the present invention should not be construed as limited to the embodiments set forth herein. Further, equivalent modifications and changes falling within the scope of the claims are intended to be included within the scope of the present invention.
Claims (9)
1. A negative pressure screen is characterized by comprising a main body welding piece, an air inlet device, a purifying device and a negative pressure forming device;
the main body welding part comprises a main body front frame and a main body middle frame, wherein the main body front frame and the main body
The middle frames are integrally connected;
the air inlet device is positioned in the main body middle frame and is of a plate-shaped frame structure;
the purification device and the negative pressure forming device are both arranged inside the front frame of the main body, and the two negative pressure forming devices are respectively arranged at the left side and the right side of the purification device.
2. The negative pressure screen of claim 1,
the air inlet device comprises a ventilation pore plate, a ventilation pipeline and an air channel cover plate;
the ventilation orifice plate, the ventilation pipeline and the air duct cover plate are sequentially and tightly connected from front to back and are arranged in the main body middle frame.
3. Negative pressure screen according to claim 2,
a middle air inlet is formed in the middle of the ventilation pore plate, and side air inlet holes are formed in the edge of the ventilation pore plate;
the ventilation pipeline and the ventilation pore plate are sealed and combined into an open semi-frame pipeline; the side air inlet hole is positioned in the ventilation pipeline, and the middle air inlet is positioned outside the ventilation pipeline;
the inner side wall of the ventilation pipeline is enclosed into a hollow funnel shape, and the opening of the funnel is downward; and an air outlet of the ventilation pipeline is provided with an air channel baffle.
4. The negative pressure screen of claim 3, wherein the ventilation duct has two air outlets, and the areas of the air outlets are equal.
5. The negative pressure screen of claim 3, wherein the ratio of the area of the opening of the funnel to the area of the air outlet is 3: 1.
6. The negative pressure screen of claim 3, wherein the inner side wall is comprised of a double layer of perforated panel walls with a sound insulation material disposed therebetween.
7. The negative pressure screen of claim 1, wherein the purification device is sequentially provided with a primary filter screen, an electrostatic device and an ozone decomposition screen from top to bottom, and is characterized in that a flow equalizing plate is arranged at the bottom of the purification device.
8. The negative pressure screen of claim 7, wherein the flow equalizing plate is an elongated plate with a cross section of a broken line type.
9. A purification integrated hospital bed, which is characterized in that the hospital bed comprises a bed body and the negative pressure screen as claimed in any one of claims 1 to 8, and the head end of the bed body is placed on the front frame of the main body of the negative pressure screen.
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| CN110486868A (en) * | 2019-08-23 | 2019-11-22 | 广州安捷生物安全科技股份有限公司 | A kind of negative pressure screen and its application |
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