CN112161369A - Desktop air curtain power device - Google Patents

Desktop air curtain power device Download PDF

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Publication number
CN112161369A
CN112161369A CN202011157362.3A CN202011157362A CN112161369A CN 112161369 A CN112161369 A CN 112161369A CN 202011157362 A CN202011157362 A CN 202011157362A CN 112161369 A CN112161369 A CN 112161369A
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China
Prior art keywords
air
fan
outlet
air inlet
desktop
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Pending
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CN202011157362.3A
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Chinese (zh)
Inventor
杨斌
吴梦纯
杨长青
周斌
苏伟
高然
尹海国
李安桂
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Priority to CN202011157362.3A priority Critical patent/CN112161369A/en
Publication of CN112161369A publication Critical patent/CN112161369A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)

Abstract

The invention belongs to the field of cross infection prevention, and particularly relates to a desktop air curtain power device which comprises an air inlet pipeline, a fan, a conveying pipeline and an air outlet, wherein the air inlet pipeline, the fan and the conveying pipeline are arranged below a desktop; the air inlet pipeline is provided with an air inlet, the air inlet pipeline is connected with the conveying pipeline through a fan, the conveying pipeline is connected with the air outlet, and an air curtain is formed above the air outlet; a control switch is arranged on the desktop and connected with the fan, and the control switch is used for controlling the opening and closing of the fan. The air curtain is simple in structure, and under the condition that the existing office building air supply system is not changed, the cross infection risk is effectively reduced on the basis of improving the quality of air sucked by personnel.

Description

Desktop air curtain power device
Technical Field
The invention belongs to the field of cross infection prevention, and particularly relates to a desktop air curtain power device.
Background
Viruses are mainly transmitted from person to person by coughing or sneezing in public places, but the fact that the public's risk is increasing indicates that traditional indoor ventilation means (mixed ventilation MV, displacement ventilation DV, etc.) may not be effective in protecting people from respiratory tract disease in offices and public places.
The traditional layered ventilation method, such as displacement ventilation, has a high ventilation coefficient, but due to the existence of a vertical temperature gradient, layered expiration occurs in the working and living areas of people, namely the so-called pollutant locking concept. The contaminants lock up in the breathing zone so that the risk of cross-infection is greatly increased. Furthermore, the air flow to the breathing zone through the displacement ventilation system may also carry contaminants carried from low levels, such as the floor, and thus also degrade the quality of the inhaled air.
However, in the existing office environment, the air supply system is already laid and put into use, and the time and labor are wasted when the air supply system is required to be changed and optimized as a whole, so that the invention is necessary to solve the problem by aiming at reducing the infection probability of the indoor respiratory diseases.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a desktop air curtain power device which effectively reduces the risk of cross infection.
The invention is realized by the following technical scheme:
a desktop air curtain power device comprises an air inlet pipeline, a fan, a conveying pipeline and an air outlet, wherein the air inlet pipeline, the fan and the conveying pipeline are arranged below a desktop;
the air inlet pipeline is provided with an air inlet, the air inlet pipeline is connected with the conveying pipeline through a fan, the conveying pipeline is connected with the air outlet, and an air curtain is formed above the air outlet;
a control switch is arranged on the desktop and connected with the fan, and the control switch is used for controlling the opening and closing of the fan.
Furthermore, a baffle plate for covering the air outlet is hinged at the air outlet.
Furthermore, the baffle is hinged to the desktop where the air outlet is located through a rotating shaft, a first gear is sleeved on the rotating shaft and meshed with a second gear, an input shaft of the second gear is connected with a motor, and the motor is connected with a control switch.
Furthermore, a filter screen is arranged at the air inlet.
Further, the air inlet comprises a lower air inlet arranged opposite to the computer cabinet and a side air inlet arranged towards the side.
Further, when two users share one desktop, a desktop power device is arranged on one side of each user, and the conveying pipelines on the two sides are connected with the air outlet through the adapter tube.
Furthermore, the air outlet is formed by a plurality of air outlet hole arrays.
Furthermore, the wind speed of the air outlet is 1.2-1.8 m/s.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a desktop air curtain power device which comprises an air inlet pipeline, a fan, a conveying pipeline and an air outlet, wherein the air inlet pipeline, the fan and the conveying pipeline are arranged below a desktop, and the air outlet is arranged on the desktop; the air inlet pipeline is provided with an air inlet; the desktop is provided with a control switch, the control switch is connected with the fan, the control switch controls the opening and closing of the fan, the air inlet pipeline is connected with the conveying pipeline through the fan, the conveying pipeline is connected with the air outlet, the fan conveys air flow to the conveying pipeline through the air inlet pipeline, and the conveying pipeline conveys the air flow out of the air outlet to form an air curtain. The invention has simple structure, and effectively reduces the risk of cross infection on the basis of improving the quality of air sucked by personnel under the condition of not changing the air supply system of the existing office building.
Furthermore, the air outlet is hinged to a baffle, when the baffle is closed, the air outlet is covered by the baffle, so that pollutants in the air are prevented from falling into the air channel, and the cleanness of the inside of the air channel is kept.
Furthermore, the air inlet is provided with a filter screen which can filter some impurities in the air.
Further, the air inlet comprises a lower air inlet arranged opposite to the computer cabinet and a side air inlet arranged towards the side. The heat plume formed by the human body and the heat plume formed by the lower heat sources such as the computer host part are effectively collected and utilized, on one hand, the heat dissipation of the lower heat sources such as the host is assisted, the energy consumption is effectively reduced, on the other hand, the formation of the lower heat plume of the personnel is blocked, the pollutants near the ground are prevented from rising to the height of a breathing area of the personnel along with the heat plume of the personnel under the action of buoyancy, and therefore the quality of breathable air is improved, and the better air supply effect is achieved.
Furthermore, the air outlet is formed by a plurality of air outlet holes in an array, and jet flows sprayed from each small air outlet hole are intersected on the table top to form an air curtain.
Drawings
FIG. 1 is an overall effect diagram of the tabletop power device of the present invention;
FIG. 2 is a schematic structural view of the tabletop power device of the present invention;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
FIG. 5 is a cloud of temperatures of the tabletop power device of the present invention as it is turned on;
FIG. 6 is a cloud of the thermal plume temperature of a person's chest when the tabletop power device of the present invention is turned on;
fig. 7 is a speed cloud when the tabletop power device of the invention is turned on.
Wherein: 1 is a desktop; 2 is a conveying pipeline; 3 is a baffle plate; 4 is an air outlet; 5 is a pipeline bracket; 6 is a fan; 7 is a filter screen; 8 is a lower tuyere; 9 is a transfer pipe; 10 is a guide plate; 11 is a side air inlet; 12 is a computer cabinet; and 13 is a control switch.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 to 4, the invention discloses an air curtain power device of a tabletop 1, which comprises an air inlet pipeline, a fan 6, a conveying pipeline 2 and an air outlet 4, wherein the air inlet pipeline, the fan 6 and the conveying pipeline 2 are arranged below the tabletop 1; the air inlet pipeline is provided with an air inlet, the air inlet pipeline is connected with the conveying pipeline 2 through a fan 6, and the conveying pipeline 2 is connected with the air outlet 4; the desktop 1 is provided with a control switch 13, the control switch 13 is connected with the fan 6, and the control switch 13 is used for controlling the on and off of the fan 6.
Specifically, the conveying pipeline 2 is fixedly arranged below the table top 1 through a pipeline bracket 5.
More preferably, there is baffle 3 articulated at air outlet 4 department, and when baffle 3 closed, baffle 3 covered air outlet 4, prevented that the pollutant in the air from falling into the wind channel, kept the inside cleanness in wind channel.
Specifically, the baffle 3 is hinged on the desktop 1 where the air outlet 4 is located through a rotating shaft, a first gear is sleeved on the rotating shaft and meshed with a second gear, an input shaft of the second gear is connected with a motor, and the motor is connected with the control switch 13. The motor is controlled to rotate through the control switch 13, the motor rotates to drive the gear pair to rotate, the rotating shaft is further driven to rotate, and finally the baffle 3 rotates.
Preferably, the air inlet is provided with a filter screen 7 which can filter some impurities in the air.
More preferably, the air inlet includes a lower air inlet 8 disposed opposite to the computer cabinet 12 and a side air inlet 11 disposed toward a side. Simulation verification proves that the inclined plane design of the side air inlet 11 can better collect the hot plume formed by the human body. Therefore, the heat plume formed by the heat sources at the lower parts, such as a computer host part and the like, is effectively collected and utilized, on one hand, the heat dissipation of the heat sources at the lower parts, such as the host and the like, is assisted, the energy consumption is effectively reduced, on the other hand, the formation of the heat plume at the lower parts of the personnel is blocked, the pollutants near the ground are prevented from rising to the height of a breathing zone of the personnel along with the heat plume of the personnel under the action of buoyancy, the quality of breathable air is improved, and therefore, a better air supply effect.
The air outlet 4 is formed by a plurality of air outlet hole arrays, and the jet flow sprayed out of each small air outlet hole intersects at the tabletop 1 to form an air curtain.
The side air outlet 4 is arranged on a guide plate 10, the guide plate 10 adopts an inclined plane design and is arranged at the port of the conveying pipeline 2, and the guide plate 10 is used for guiding the flow, so that the resistance of the hot plume entering the air pipe is reduced.
The existing office is generally a desk for two people to work face to face, when two users share one desktop 1, a power device of the desktop 1 is arranged on one side of each user, and the conveying pipelines 2 on the two sides are connected with the air outlet 4 through the adapter tube 9. One baffle 3 can be shared, the baffle 3 can be made larger, and the opening and closing of the baffle 3 can be controlled by any party.
Simulation and experimental studies on the ventilation performance of the air curtain in the polluted area show that the air curtain can not effectively prevent the diffusion of pollutants at a lower air supply temperature. Research shows that when the critical air supply speed is between 1m/s and 1.5m/s, the ventilation efficiency of the area where people are located is far higher than that of the area with lower air supply speed. Compared with the prior air curtain in which the air port is arranged at the top of a room by 2.7m, the air curtain outlet is arranged at the position 10.7m away from the desktop, the height distance from the air outlet to the breathing area of people is shorter, and the protection effect is better than that of a top-delivery air curtain.
The tuyere flow rate can be expressed as:
3600abV equation 1
In the formula, L-2 flow of delivery pipe, m3H; v is wind speed in the pipe, m/s; a, b-clear width and clear height, m, of the cross section of the conveying pipeline 2.
The conveying pipeline 2 is positioned at the lower part of the tabletop 1, and the inner wall of the conveying pipeline 2 is smooth, small in resistance and high in rigidity. The pressure loss of the present invention can be obtained by the following formula, and the pressure loss of the transfer pipe 2 is:
ΔP＝ΔPm+ΔPjequation 2
In the formula,. DELTA.Pm-the on-way pressure loss, Pa, of the delivery conduit 2; delta Pj-local pressure loss, Pa, of the delivery conduit 2.
The on-way pressure loss per unit tube length is:
Figure RE-GDA0002808809190000051
wherein λ represents a frictional resistance coefficient; rho-air Density, kg/m3；de-the equivalent diameter of the transfer pipe 2, m.
When the air is in a standard state, i.e. the atmospheric pressure is 101.325kPa, the temperature is 20 ℃, and the density ρ is 1.2kg/m3The kinematic viscosity v is 15.06 × 10-6m2And s. The unit on-way pressure loss delta p in the conveying pipeline 2 can be calculated according to the absolute roughness of the inner wall of the conveying pipeline 2m. The length l of the conveying pipeline 2 is basically consistent with that of the table top 1, so that the pressure loss of the conveying pipeline 2 along the way is as follows: delta Pm＝Δpml. From this, the flow value L of the fan 6 can be determined.
When the air flow passes through the fittings and equipment of the system of conveying pipes 2, local resistance is generated when the air flow passes through the line vortex due to the change of the flowing direction of the air flow, the change of the flowing section and the change of the flow rate. To overcome the energy loss due to local resistance, the resulting local pressure can be calculated as follows:
Figure RE-GDA0002808809190000061
the type of the fan 6 is selected according to the characteristics of the case of the invention and the required wind and lift.
With the tuyere as a starting point, the axial velocity decay law can be expressed as:
Figure RE-GDA0002808809190000062
in the formula, vx-maximum wind speed, m/s, at a horizontal distance x from the outlet mouth 4; v. ofs-outlet air speed m/s of the air outlet; k is 4 constants of the air outlet, and the strip slit air port is 2.35; b-the effective width of the seam, m.
When the outlet 4 forms a jet upwards, the outlet v is taken outsThe speed was 1.5 m/s. According to equation (5), x0The maximum wind speed at the air outlet 1m of the air curtain can be 1.2m/s according to the distance from the center of the air outlet 4 to the far point of the appearance of the main air flow, wherein 0 is taken.
Wind speed v of wind outlet 4 finally designedsAt 1.2m/s to 1.8 m/s.
If the ceiling height of the house is 2.7m, the breathing zone height of the sitting posture work area is 1.1m, the head top height is 1.3m and the table top height is 0.7m, the speed attenuation of the air curtain of the table top 1 at the position of 1.7m is 1.2m/s, the diffusion of pollutants can still be effectively blocked, and therefore the cross infection risk of the sitting posture human body can be effectively reduced under the operation of the device.
Fig. 5 and 6 show the temperature cloud and the speed cloud of the opening of the device at the flow rate of the fan of 11.5L/s, and it can be seen from the temperature cloud that when the device is opened, the thermal plume below the chest of a person is effectively weakened through the action of the fan 6, and the effectiveness of the device for improving the quality of breathable air of the person is indicated. Fig. 7 shows the velocity distribution of the air curtain from the jet outlet section of the air curtain to 1.7m, and it can be seen that the outflow velocity of the air curtain at 1.7m has a positive effect on blocking the pollutants exhaled by the person, and the air curtain can effectively reduce the risk of direct infection of the infected person to the healthy human body.
The principle and embodiments of the present invention are explained above, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A desktop air curtain power device is characterized by comprising an air inlet pipeline, a fan (6), a conveying pipeline (2) and an air outlet (4), wherein the air inlet pipeline, the fan (6) and the conveying pipeline are arranged below a desktop (1), and the air outlet (4) is formed in the desktop (1);
an air inlet is arranged on the air inlet pipeline, the air inlet pipeline is connected with the conveying pipeline (2) through a fan (6), the conveying pipeline (2) is connected with the air outlet (4), and an air curtain is formed above the air outlet (4);
a control switch (13) is arranged on the desktop (1), the control switch (13) is connected with the fan (6), and the control switch (13) is used for controlling the fan (6) to be turned on and off.
2. A table top air curtain power plant as claimed in claim 1, characterised in that a flap (3) is hinged at the outlet opening (4) for covering the outlet opening (4).
3. A table top air curtain power device according to claim 1, characterized in that the baffle (3) is hinged on the table top (1) where the air outlet (4) is located through a rotating shaft, a first gear is sleeved on the rotating shaft, the first gear is meshed with a second gear, an input shaft of the second gear is connected with a motor, and the motor is connected with the control switch (13).
4. A table top air curtain power plant as claimed in claim 1, wherein the air inlet is provided with a filter screen (7).
5. A desktop air curtain power plant as claimed in claim 1, characterized in that the air intakes comprise a lower air opening (8) arranged opposite the computer cabinet (12) and a side air opening (11) arranged towards the side.
6. A table top air curtain power unit according to claim 1, characterized in that when two users share a table top (1), a power unit for the table top (1) is provided on each user side, and the delivery ducts (2) on both sides are connected to the air outlet (4) through the adapter tube (9).
7. A table top air curtain power plant as claimed in claim 1, wherein the outlet (4) is formed by an array of a plurality of outlet vents.
8. A table top air curtain power plant as claimed in claim 1, wherein the wind speed of the outlet (4) is 1.2-1.8 m/s.
CN202011157362.3A 2020-10-26 2020-10-26 Desktop air curtain power device Pending CN112161369A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011157362.3A CN112161369A (en) 2020-10-26 2020-10-26 Desktop air curtain power device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011157362.3A CN112161369A (en) 2020-10-26 2020-10-26 Desktop air curtain power device

Publications (1)

Publication Number Publication Date
CN112161369A true CN112161369A (en) 2021-01-01

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ID=73864694

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011157362.3A Pending CN112161369A (en) 2020-10-26 2020-10-26 Desktop air curtain power device

Country Status (1)

Country Link
CN (1) CN112161369A (en)

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