Efficient low-resistance type fan pipe coil return air purification device

Abstract

The utility model discloses an efficient low-resistance type fan pipe coil return air purification device which is provided with a purification shell, the upper side and the lower side of the purification shell are provided with a return air inlet and a return air outlet respectively, and a detachable nanofiber filter screen is installed in the purification shell. The front side wall of the purification shell is further provided with a pressure difference sensor, and a pressure tapping pipe opening high-pressure end and a pressure tapping pipe opening low-pressure end of the pressure difference sensor are connected to the return air inlet and the return air outlet respectively. An overhaul window is further formed in the front side wall of the purification shell, and an overhaul cover plate is mounted on the overhaul window; the purification device disclosed by the utility model has the main characteristics of high particulate matter purification efficiency and low wind resistance, and can be matched with a fan system to quickly improve the indoor air quality. Especially in crowded areas such as hospitals, air circulation is not good, the virus load in the air is high, and a safe breathing environment for patients, family members and medical staff can be created through positive air change of the breathing device.

Description

Technical Field

[0001] The utility model relates to the technical field of large-scale ventilation and purification equipment, in particular to a high-efficiency and low-resistance fan tube coil return air purification device. Background Art

[0002] There are two main types of existing fan coil return air purification solutions. The first is an electrostatic non-barrier physical purification solution, which includes plate electrostatic (ESP) and micro-electrostatic (IFD). The purification principle is to use a high-voltage electrostatic field to charge the particles, and then capture them by the dust collecting plate to achieve an air filter that removes the particulate content in the air. The mainstream return air purification solution currently used in hospital air discs uses a micro-electrostatic method. The installation position is located above the return air louver outlet. The power supply is generally connected to the fan coil, and the built-in air flow switch is linked to the air disc. The second is an electret electrostatic fiber filter (physical barrier purification solution, using melt-blown filter material). The purification principle is electrostatic enhanced fiber filtration, using pre-charge or external electric field. The particle capture is mainly the Coulomb force and induction force of the charged fiber on the particles (charged or uncharged particles), so as to achieve the purpose of increasing efficiency and reducing resistance. This device purification module is generally installed above the return air louver outlet or on the return air duct. If these two purification schemes are used in hospital scenarios, the corresponding standard is GB51039-2014 "General Hospital Building Design Code". The return air outlet of the central air-conditioning system and fan coil unit must be equipped with filtering equipment with an initial resistance of less than 50Pa, a microbial one-time pass rate of no more than 10%, and a particulate matter one-time weight pass rate of no more than 5%.

[0003] Existing technologies can solve the problem of air purification quality in hospital scenes to a certain extent, but they cannot solve the core problem at present. The compilation of the "General Hospital Architectural Design Code" focuses on PM2.5 particles, that is, particles that enter the lungs. The corresponding return air purification level is between the national standard medium efficiency Z2 and medium efficiency Z3. The specific standard refers to "Air Filter" GB / T14295-2019. The main problem of current hospital scene applications is to prevent the spread of respiratory infections when there are dense crowds and poor ventilation. The focus is on PM1-type viruses, bacteria and other microorganisms and attached aerosol particles. After breathing such particles, they directly enter the human blood, and the human body cannot defend against such ultrafine particles. Compared with PM2.5 particles, PM1 particles are invisible, but more dangerous. To quickly remove PM1 ultrafine particles, the corresponding return air purification level should be the national standard sub-high efficiency (YG) or above. Protecting the respiratory safety of the hospital environment should be the theme of return air purification of fan coil units in hospitals now.

[0004] For example, during the operation of a purification and filtration device composed of non-separated high-voltage static electricity or micro-static electricity, it has a good effect in filtering large particles such as PM2.5 and PM10 and above, but a poor effect in filtering ultra-fine particles of the PM1 type. During the process of filtration and purification, there is also a problem of unstable filtration efficiency. When dust accumulates on the dust collection plate, the purification efficiency of the static electricity module further decreases. When in use, the discharge end is prone to generate sparks, sounds, ozone, and nitrogen oxide derivatives, and it cannot be used for a long time in a closed room with poor ventilation, which poses other hazards to the human body.

[0005] For example, a blocking type electret electrostatic fiber filter screen can purify PM2.5 particles with high efficiency and low resistance, and also has a good purification effect on PM1 particles. However, it relies on electrostatic adsorption to purify particles, is greatly affected by humidity, and has a short lifespan. After the static electricity is eliminated, the filtration efficiency of this filter will drop sharply, failing to meet the requirements of stable purification. According to the above new standard of "Air Filters" GB / T14295-2019, this material must be subjected to static electricity elimination treatment before use. After the static electricity is eliminated, the purification performance of this material disappears and it cannot be used in compliance. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a high-efficiency and low-resistance type fan pipe panel return air purification device in view of the above situation. This return air purification device has a simple structural design, strong practicability, and obvious purification effect.

[0007] The specific scheme of the present utility model is: a high-efficiency and low-resistance type fan pipe panel return air purification device, which has a purification housing. An air return inlet and an air return outlet are respectively arranged on the upper and lower sides of the purification housing. A detachable nanofiber filter screen is installed inside the purification housing, and the return air passes through the air return inlet, the nanofiber filter screen, and the air return outlet in sequence; a differential pressure sensor is also installed on the front side wall of the purification housing. The high-pressure end and the low-pressure end of the pressure-taking pipe orifice of the differential pressure sensor are respectively connected to the air return inlet and the air return outlet, and are placed on the upper and lower sides of the nanofiber filter screen; a maintenance window is also provided on the front side wall of the purification housing, and a maintenance cover plate is installed on the maintenance window.

[0008] Further, in the present utility model, the nanofiber filter screen is made by grafting active oxygen functional molecules onto a nanofiber material for modification.

[0009] Further, in the present utility model, the nanofiber filter screen installed inside the purification housing is composed of two filter screens arranged side by side. Slide block and chute structures are provided at the front and rear ends of each nanofiber filter screen, and the nanofiber filter screen slides left and right inside the purification housing through the slide block and chute structures.

[0010] Further, in the present utility model, the nanofiber filter screen is arranged in a wavy folding structure.

[0011] Further, in the present utility model, the maintenance cover plate on the maintenance window is connected to the front side wall of the purification housing through a hinge, and the movable edge of the maintenance cover plate is tightened and closed or loosened and opened by a hand-tightening nut.

[0012] Further, in the present utility model, flange interfaces are installed on both the air return inlet and the air return outlet of the purification housing, and the flange interfaces are connected to the corresponding air return pipes.

[0013] Further, in the present utility model, the purification housing is arranged in a cuboid shape, and lifting lugs are also arranged on the left and right side walls of the purification housing.

[0014] Further, in the present utility model, the width of the maintenance window is greater than the width of the nanofiber filter screen, so as to facilitate taking out the nanofiber filter screen from it for replacement and maintenance.

[0015] The main features of the purification device of the present utility model are high particulate matter purification efficiency and low air resistance, and it can be matched with a fan system to quickly improve the indoor air quality problem. Especially in crowded areas such as hospitals, the air circulation is not good and the virus load in the air is relatively high. Through the active air change of the present utility model, a safe breathing environment for patients, family members and medical staff can be created. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the schematic structural diagram in the front view direction of the present utility model;

[0017] Figure 2 is the schematic structural diagram in the top view direction of the present utility model;

[0018] Figure 3 is the schematic structural diagram in the side view direction of the present utility model;

[0019] Figure 4 is the schematic structural diagram in the perspective view direction of the present utility model;

[0020] Figure 5 is the first maintenance operation state of the present utility model;

[0021] Figure 6 is the second maintenance operation state of the present utility model;

[0022] Figure 7 is the third maintenance operation state of the present utility model;

[0023] Figure 8 is the fourth maintenance operation state of the present utility model.

[0024] In the figure: 1 - lifting lug, 2 - high-pressure end of pressure-taking pipe orifice, 3 - differential pressure sensor, 4 - return air inlet flange interface, 5 - maintenance cover plate, 6 - purification housing, 7 - hand-tightening nut, 8 - return air outlet flange interface, 9 - low-pressure end of pressure-taking pipe orifice, 10 - nanofiber filter screen, 11 - maintenance window, 12 - slider chute structure. Specific implementation mode

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the protection scope of the present invention. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] See Figures 1 to 4, the utility model is an efficient low-resistance fan pipe panel return air purification device, which has a purification housing 6. An air return inlet and an air return outlet are respectively arranged on the upper and lower sides of the purification housing. A detachable nanofiber filter screen 10 is installed inside the purification housing. The return air sequentially passes through the air return inlet, the nanofiber filter screen, and the air return outlet. Further, flange interfaces are installed on both the air return inlet and the air return outlet of the purification housing in the utility model, and the flange interfaces are connected to the corresponding return air pipes. As shown in the figure, the air return inlet flange interface 4 and the air return outlet flange interface 8. Further, the purification housing in the utility model is arranged in a cuboid shape, and lifting lugs 1 are also arranged on the side walls at the left and right ends of the purification housing; a differential pressure sensor 3 is also installed on the front side wall of the purification housing. The high-pressure end 2 and the low-pressure end 9 of the pressure-taking pipe orifice of the differential pressure sensor are respectively connected to the air return inlet and the air return outlet and are arranged on the upper and lower sides of the nanofiber filter screen; a maintenance window 11 is also arranged on the front side wall of the purification housing, and a maintenance cover plate 5 is installed on the maintenance window; further, the maintenance cover plate on the maintenance window in the utility model is connected to the front side wall of the purification housing through a hinge, and the movable edge of the maintenance cover plate is tightened and closed or loosened and opened by a hand-tightening nut 7.

[0028] Further, the nanofiber filter screen in the utility model is made by grafting active oxygen functional molecules onto nanofiber materials for modification. Further, the nanofiber filter screen in the utility model is arranged in a wavy folding structure. Further, the width of the maintenance window in the utility model is greater than the width of the nanofiber filter screen, so as to facilitate taking out the nanofiber filter screen from it for replacement and maintenance. Further, the nanofiber filter screen installed inside the purification housing in the utility model is composed of two filter screens arranged side by side. Slide block and chute structures 12 are arranged at the front and rear ends of each nanofiber filter screen. The nanofiber filter screen slides left and right in the purification housing through the slide block and chute structures. Specifically, the slide block and chute structure 12 is composed of slides arranged on the front and rear sides of the nanofiber filter screen and chutes arranged on the inner side walls of the purification housing. The nanofiber filter screen can slide and move on the chutes. After the maintenance window is opened, the nanofiber filter screen can be taken down by slightly lifting it upward. See Figure 7 as shown.

[0029] The purification device of the utility model is connected to the return air louver or the return air duct of the fan coil unit. This product is particularly suitable for use in places such as hospitals, where there are dense crowds. Quick purification and maintaining clean air are effective means to avoid cross-infection. During the process of the nanofiber filter screen intercepting particulate matter (viruses attached to aerosols), it effectively prevents people from breathing in this pollutant, which is the basic function of the nanofiber filter screen. After a long period of purification and filtration, if there is no bactericidal factor in the filter screen to treat pollutants, these intercepted viruses will aggregate, easily breed and multiply on the filter screen, forming a new pollution source and causing "secondary pollution". The filter screen equipped with this device has a high-efficiency bactericidal and antiviral function. The self-synthesized polymer free radical type bactericidal active functional group is grafted onto the nanofiber material by flexible loading technology to modify the active oxygen functional molecule. Its polymer free radical can destroy the cell membrane structure of bacteria through its strong oxidation characteristics, denature the viral protein coat, thereby achieving efficient killing of bacteria and viruses, and having the characteristics of being fast, efficient, long-lasting, broad-spectrum, and safe.

[0030] After the relevant equipment of the utility model runs for a long time, the nanofiber filter screen accumulates dust, resulting in an increase in resistance. Therefore, a differential pressure sensor is configured on the purification housing. During use, it is not necessary to remove the nanofiber filter screen to check the service life of the filter screen of the device and determine whether the filter screen needs to be replaced. Under normal circumstances, the service life of the filter screen in the device is about one year. However, in the case of frequent extreme weather, after the equipment runs, the service life of the filter screen changes. Installing detection devices such as differential pressure sensors can effectively observe the actual situation. The high-pressure end 2 of the pressure tapping port and the low-pressure end 9 of the pressure tapping port of the differential pressure sensor are respectively connected to the return air inlet and the return air outlet. That is, when the differential pressure sensor detects that the pressure difference between the two ends exceeds the normal range, it can be known that the nanofiber filter screen accumulates a lot of dust or is damaged and needs to be repaired or replaced.

[0031] When performing maintenance or replacement, the specific operation can be referred to the Figures 5 - 8 status schematic diagram. First, open the maintenance cover plate, push up one of the nanofiber filter screens and take it out, then slide the other one to the maintenance window and take it out for relevant maintenance or replacement.

[0032] The main features of the purification device of the utility model are high particulate matter purification efficiency and low air resistance. It can be matched with a fan system to quickly improve the indoor air quality problem. Especially in crowded areas such as hospitals, where the air circulation is not very good and the virus load in the air is relatively high, a safe breathing environment for patients, family members, and medical staff can be created through the active air change of the utility model.

Claims

1. A high-efficiency, low-resistance fan coil return air purification device, characterized in that: It has a purification shell, and the upper and lower sides of the purification shell are respectively provided with a return air inlet and a return air outlet. A detachable nanofiber filter is installed inside the purification shell, and the return air passes through the return air inlet, the nanofiber filter and the return air outlet in sequence; a differential pressure sensor is also installed on the front side wall of the purification shell, and the high-pressure end and the low-pressure end of the pressure taking pipe mouth of the differential pressure sensor are respectively connected to the return air inlet and the return air outlet, and are placed on the upper and lower sides of the nanofiber filter; an inspection window is also provided on the front side wall of the purification shell, and an inspection cover is installed on the inspection window.

2. According to claim 1, a high-efficiency, low-resistance fan coil return air purification device is characterized in that: The nanofiber filter installed inside the purification shell is composed of two filters arranged side by side. A slider groove structure is provided at the front and rear ends of each nanofiber filter. The nanofiber filter slides left and right in the purification shell through the slider groove structure.

3. A high-efficiency, low-resistance fan coil return air purification device according to claim 1 or 2, characterized in that: The nanofiber filter screen is arranged in a wave-shaped folding structure.

4. The high-efficiency, low-resistance fan coil return air purification device according to claim 1 is characterized in that: The inspection cover plate on the inspection window is connected to the front side wall of the purification shell through a hinge, and the movable edge of the inspection cover plate is tightened and closed or loosened and opened by hand-tightening a nut.

5. The high-efficiency, low-resistance fan coil return air purification device according to claim 1 is characterized in that: The return air inlet and the return air outlet of the purification housing are both provided with flange interfaces, and the flange interfaces are connected to the corresponding return air ducts.

6. The high-efficiency, low-resistance fan coil return air purification device according to claim 1, characterized in that: The purification shell is arranged in a rectangular parallelepiped shape, and hanging ears are arranged on the left and right side walls of the purification shell.

7. The high-efficiency, low-resistance fan coil return air purification device according to claim 1, characterized in that: The width of the inspection window is greater than the width of the nanofiber filter, so that the nanofiber filter can be taken out for replacement and inspection.

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