Air handling unit countercurrent cleaning device and method

Abstract

The invention provides a countercurrent cleaning device and method for an air handling unit, relates to the field of air handling equipment, and aims to solve the problem that a filter material is easily damaged and mildewed due to residual water in the prior art. The problems of mildewing of the filter material caused by water invasion and damage, tearing and the like caused by high-pressure airflow are effectively avoided, so that the service life of the filter material is prolonged; the first pulse air pipe and the second pulse air pipe of the pulse assembly are used for outputting pulse airflow to the upstream air duct and the downstream air duct of the filtering assembly respectively, attachments on a filtering material can be disturbed and effectively removed, the cleaning efficiency is improved, the annular air outlet can uniformly distribute the airflow, it is ensured that the pulse airflow can completely cover the surface of the filtering assembly, and the filtering efficiency is improved. Therefore, impurities and particulate matters attached to the filter material are effectively disturbed and removed, and the cleanliness and the filtering efficiency of the filter material are maintained.

Description

Technical Field

[0001] The invention relates to the field of air handling equipment, and in particular to a backflow cleaning device and method for an air handling unit. Background Art

[0002] At present, hospitals, large shopping malls, office buildings, and residences are mostly equipped with air handling units, which use the method of sending fresh air to replace direct window opening to ensure the air quality in the room. The filter segment of the existing air handling unit needs to be replaced regularly. When the high-configuration air handling unit is actually in operation, a differential pressure gauge is set on both sides of the existing filter segment. According to the pressure gauge, it is replaced after the differential pressure exceeds the specified pressure. In an environment with poor outdoor air quality, the replacement cycle of the primary filter segment is 10d to 15d; if the fresh air system is used for a long time, the cost of filter materials and labor hours when replacing the filter segment is relatively expensive. Restricted by on-site management personnel and management systems, in actual operation, the filter segment of the air handling unit is often replaced quarterly, or even once every six months. This method will cause the pressure loss of the filter to remain at a relatively high state, resulting in the fan frequency also maintaining a high level, causing the entire set of air handling equipment to be noisy and consume more power; even worse, it will cause filtration degradation, and the quality of fresh air sent into the room will not meet the standard requirements, affecting the health of the users.

[0003] A new automatic filtering device and method for HVAC is disclosed in a Chinese patent (publication number CN 110404358 A), which measures the pressure difference between the front chamber of the filter chamber and the rear chamber of the filter chamber, uses a water supply mechanism to clean the filter element, and sets a hydraulic turntable device and a layered overflow device to realize the recycling of cleaning water. However, the filter materials of some air handling units are not suitable for direct water flushing (such as hospitals, biological laboratories and other places with high requirements for air cleanliness). Water flushing can easily lead to damage to the filter materials. At the same time, if the filter materials cannot be dried in time after water flushing, they will cause mold on the filter materials, affecting the quality of the fresh air sent into the room. Moreover, as an independent device, this device occupies a large installation space. When high-pressure airflow is used for flushing and cleaning, the high-pressure airflow directly blows the filter materials and easily causes excessive deformation of the filter materials, causing problems such as damage and tearing, which affects the service life of the filter materials. The impurities that fall off after the high-pressure airflow is also difficult to be effectively processed and are easily attached to the filter materials again, resulting in a high pressure loss of the filter materials. Summary of the invention

[0004] The purpose of the present invention is to provide a backflow cleaning device and method for an air handling unit in view of the defects of the prior art. By adopting pulse airflow instead of direct water flushing or high-pressure airflow direct blowing, the filter material is effectively prevented from getting moldy due to water intrusion and from being damaged or torn due to high-pressure airflow, thereby extending the service life of the filter material. The first pulse air duct and the second pulse air duct of the pulse assembly are used to output pulse airflow to the upstream and downstream air ducts of the filter assembly respectively, which can disturb and effectively remove the attachments on the filter material, thereby improving the cleaning efficiency. By setting up the recovery assembly, the detached attachments can be collected in the recovery bin, thereby realizing the recycling of materials in the cleaning process and reducing environmental pollution. It can also be integrated in the air handling unit to reduce the installation space and installation cost.

[0005] The first object of the present invention is to provide a backflow cleaning device for an air handling unit, which adopts the following scheme:

[0006] include:

[0007] The isolation valves are respectively installed in the upstream and downstream air ducts of the filter assembly;

[0008] The pulse assembly is provided with a first pulse air duct and a second pulse air duct, the first pulse air duct is provided with a plurality of annular air outlets connected to the upstream air duct of the filter assembly, and the second pulse air duct is provided with a plurality of annular air outlets connected to the downstream air duct of the filter assembly;

[0009] The recovery component is provided with a recovery bin, which is connected to the upstream air duct of the filter component through a first recovery pipe, and is connected to the downstream air duct of the filter component through a second recovery pipe. The recovery bin is connected to the air duct and is distributed relative to the annular air outlet.

[0010] Furthermore, a cleaning chamber is formed between the isolation valve and the filter assembly, and the annular air outlet and the recovery bin are respectively connected to the cleaning chamber.

[0011] Furthermore, the first recovery pipe and the second recovery pipe are connected to the cleaning chamber through recovery ports respectively, and the recovery port and the annular air outlet are located on the opposite sides of the air duct.

[0012] Furthermore, a protective net is provided between the isolation valve and the filter assembly, and the protective net restricts the deformation degree of the filter assembly at the upstream and downstream of the filter assembly respectively.

[0013] Further, in the upstream region or the downstream region of the filter assembly, the annular air outlet is located between the protective net and the isolation valve.

[0014] Furthermore, pulse control valves are installed on the first pulse air duct and the second pulse air duct respectively, and the first pulse air duct and the second pulse air duct are connected to a compressed air source together.

[0015] Furthermore, the first recovery pipe and the second recovery pipe are respectively installed with a reflux control valve, and the first recovery pipe and the second recovery pipe are connected to the recovery bin through a pipeline fan.

[0016] Furthermore, the duct fan is connected to the inlet end of the recovery bin, an insect-proof net is provided at the outlet end of the recovery bin, and a baffle and a filter net are provided inside the recovery bin.

[0017] The second object of the present invention is to provide a working method of the backflow cleaning device of an air handling unit as described in the first object, comprising:

[0018] Close the isolation valves in the upstream and downstream air ducts of the filter assembly;

[0019] The first pulse air duct first outputs a pulse airflow through the annular air outlet to disturb the filter component, causing the attached matter on the filter component to fall off, and the first recovery pipe obtains the fallen attached matter and collects it in the recovery bin;

[0020] The second pulse air duct outputs pulse airflow through the annular air outlet to disturb the filter component, causing the attached matter on the filter component to fall off. The second recovery pipe obtains the fallen attached matter and collects it in the recovery bin;

[0021] After repeatedly cleaning the filter assembly by the first pulse air duct and the second pulse air duct for multiple times, the pulse assembly and the recovery assembly are closed;

[0022] Open the isolation valves in the upstream and downstream air ducts of the filter assembly.

[0023] Furthermore, the pressure difference in the air duct before and after the filter assembly is detected, and when the pressure difference reaches a set value, the pulse assembly and the recovery assembly are turned on to clean the filter assembly.

[0024] Compared with the prior art, the present invention has the following advantages and positive effects:

[0025] (1) In view of the current problem that water washing filter materials are easily damaged and residual moisture causes mold, by using pulse airflow instead of direct water washing or high-pressure airflow, the mold caused by water intrusion and the damage and tearing caused by high-pressure airflow are effectively avoided, thereby extending the service life of the filter material; the first pulse air duct and the second pulse air duct of the pulse component are used to output pulse airflow to the upstream and downstream air ducts of the filter component respectively, which can disturb and effectively remove the attachments on the filter material, thereby improving the cleaning efficiency; the annular air outlet can evenly distribute the airflow to ensure that the pulse airflow can fully cover the surface of the filter component, thereby effectively disturbing and removing impurities and particulate matter attached to the filter material, ensuring that the cleanliness and filtration efficiency of the filter material are maintained; through the setting of the recovery component, the detached attachments can be collected in the recovery bin, realizing the recycling of materials in the cleaning process and reducing environmental pollution. It can also be integrated on the air handling unit to reduce installation space and installation costs.

[0026] (2) An automated control system is used, which can automatically start and stop the cleaning process according to the signal fed back by the pressure difference detection device. Compared with the traditional high-pressure airflow or water flushing method, the pulse airflow cleaning method can more accurately control the cleaning force and frequency, thereby reducing energy consumption while ensuring the cleaning effect; the setting of the recovery component enables the attachments that fall off during the cleaning process to be effectively collected and recycled, reducing resource waste.

[0027] (3) The setting of the isolation valve can isolate the filter component from the air duct system during the cleaning process, avoiding the impact of impurities or airflow that may be generated during the cleaning process on the air duct system, ensuring the safe and stable operation of the system. The setting of the protective net can restrict the deformation of the filter component during the cleaning process, prevent damage or tearing caused by excessive deformation, and improve the safety and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 Schematic diagram of the backflow cleaning device of the air handling unit in Examples 1 and 2 of the present invention.

[0030] Figure 2 Schematic diagram of the backflow cleaning device of the air handling unit in Examples 1 and 2 of the present invention.

[0031] Figure 3 Schematic diagram of the backflow cleaning device of the air handling unit in Examples 1 and 2 of the present invention.

[0032] Among them, 1. Isolation valve; 2. First pulse air duct; 3. Second pulse air duct; 4. Annular air outlet; 5. Filter assembly; 6. First recovery pipe; 7. Second recovery pipe; 8. Recovery bin; 9. Cleaning chamber; 10. Protective net; 11. Pulse control valve; 12. Backflow control valve; 13. Pipe fan; 14. Insect-proof net; 15. Baffle; 16. Filter net; 17. Filter material. DETAILED DESCRIPTION

[0033] Example 1

[0034] In a typical embodiment of the present invention, Figure 1-Figure 3 As shown, a backflow cleaning device for an air handling unit is provided.

[0035] When high-pressure airflow is used for flushing and cleaning, the high-pressure airflow directly blowing the filter material 17 can easily cause excessive deformation of the filter material 17 and cause problems such as breakage and tearing, which affects the service life of the filter material 17. Based on this, the present embodiment provides a countercurrent cleaning device for an air handling unit. By using pulse airflow instead of direct water flushing or direct high-pressure airflow, the filter material 17 is effectively prevented from getting moldy due to water intrusion and from being damaged or torn due to high-pressure airflow, thereby extending the service life of the filter material 17. The first pulse air duct 2 and the second pulse air duct 3 of the pulse assembly are used to output pulse airflows to the upstream and downstream air ducts of the filter assembly 5, respectively, which can disturb and effectively remove the attachments on the filter material 17, thereby improving the cleaning efficiency. The annular air outlet 4 can evenly distribute the airflow, ensuring that the pulse airflow can fully cover the surface of the filter assembly 5, thereby effectively disturbing and removing impurities and particulate matter attached to the filter material 17, ensuring that the cleanliness and filtering efficiency of the filter material 17 are maintained. Through the setting of the recovery assembly, the fallen attachments can be collected in the recovery bin 8, thereby realizing the recycling of materials during the cleaning process and reducing environmental pollution.

[0036] like Figure 1 As shown, the backflow cleaning device of the air handling unit includes a cut-off valve 1, a pulse assembly and a recovery assembly, wherein the cut-off valve 1 is respectively installed in the upstream and downstream air ducts of the filter assembly 5. During the cleaning process, the cut-off valve 1 can isolate the filter assembly 5 from the air duct system to ensure that the cleaning process does not affect the normal operation of the air duct system, and also protect the filter material 17 from direct impact of external airflow.

[0037] The pulse assembly includes a first pulse air duct 2 and a second pulse air duct 3, which are respectively connected to the upstream and downstream air ducts of the filter assembly 5. Each pulse air duct is provided with a plurality of annular air outlets 4, which can evenly output pulse airflow to disturb and remove attachments on the filter material 17. Compared with direct high-pressure airflow, the pulse airflow output by the annular air outlet 4 is softer and more uniform, avoiding damage and tearing of the filter material 17.

[0038] In addition, the annular air outlet 4 can evenly distribute the airflow, ensuring that the pulsed airflow can fully cover the surface of the filter assembly 5, thereby effectively disturbing and removing impurities and particulate matter attached to the filter material 17. Uniform airflow distribution helps to improve the efficiency and effect of cleaning, ensuring that the cleanliness and filtration efficiency of the filter material 17 are maintained. Compared with the direct blowing of high-pressure airflow, the pulsed airflow output by the annular air outlet 4 is softer and more uniform, which can avoid excessive impact and deformation on the filter material 17, thereby extending the service life of the filter material 17. By reducing the risk of damage and tearing of the filter material 17, the annular air outlet 4 helps to reduce the frequency and cost of replacing the filter material 17.

[0039] The annular air outlet 4 can reduce the noise generated by the airflow during output, making the air handling unit quieter during operation, improving the working environment and user experience, which is more important in noise-sensitive places (such as hospitals, schools, etc.).

[0040] The recovery component includes a recovery bin 8, a first recovery pipe 6 and a second recovery pipe 7. The recovery bin 8 is connected to the upstream and downstream air ducts through the recovery pipes, and can collect the fallen attachments to achieve material recycling during the cleaning process. The recovery bin 8 is connected to the air duct and is relatively distributed with the annular air outlet 4 to ensure that the fallen attachments can be effectively collected.

[0041] The filter assembly 5 in this embodiment adopts an ultra-thin washable filter device, including a steel component and a filter material 17. The shape and structure of the steel component are designed according to the filtering requirements in the air duct, and the filter material 17 is wrapped on the outside of the steel component; the steel component divides the filter material 17 into strips, and the strip filter material 17 can have a certain amount of deformation when the system is operating normally; to reduce the wear of the filter material 17 during deformation, a layer of filter material 17 of the same material is wrapped on the outside of the steel component; to prevent the unit from malfunctioning and the filter material 17 being damaged by the steel components that fall off the unit during backflow cleaning, in this embodiment, a protective net 10 is provided between the isolation valve 1 and the filter assembly 5. At the same time, the protective net 10 respectively constrains the deformation degree of the filter assembly 5 at the upstream and downstream of the filter assembly 5. In this embodiment, the protective net 10 is a 4-mesh steel wire mesh.

[0042] The recovery component is a shell structure, the shell material is Q235B, and the air leakage of the closed valve is ≤0.2%. The pulse device is composed of a pipeline and a pulse valve body; the pulse valve body is a lower annular air outlet valve body. A cleaning chamber 9 is formed between the isolation valve 1 and the filter component 5, the annular air outlet 4 and the recovery bin 8 are respectively connected to the cleaning chamber 9, the first recovery pipe 6 and the second recovery pipe 7 are respectively connected to the cleaning chamber 9 through the recovery port, and the recovery port and the annular air outlet 4 are located on the opposite side of the air duct.

[0043] The first pulse air duct 2 and the second pulse air duct 3 are respectively installed with a pulse control valve 11, and the first pulse air duct 2 and the second pulse air duct 3 are commonly connected to a compressed air source; the first recovery pipe 6 and the second recovery pipe 7 are respectively installed with a reflux control valve 12, and the first recovery pipe 6 and the second recovery pipe 7 are commonly connected to a recovery bin 8 through a pipeline fan 13.

[0044] When the system is running, the annular air outlet 4 can counteract the airflow, thereby disturbing the filter assembly 5 with the edge of the airflow, preventing the airflow from directly rushing to the filter assembly 5 and damaging the filter material 17.

[0045] In addition, a pressure detection device is installed in the cleaning chamber 9, which can be used to detect the pressure difference between the upstream and downstream of the filter assembly 5, and can also be used to detect the pressure in the cleaning chamber 9 when the pulse assembly is working. When the air handling unit is running to output fresh air, if it is detected that the pressure in the cleaning chamber 9 exceeds 0.6MPa, the isolation valve 1 can be opened to release the pressure, so as to realize overpressure protection of the recovery bin 8 and the filter material 17.

[0046] The duct fan 13 is connected to the inlet end of the recovery bin 8, an insect-proof net 14 is provided at the outlet end of the recovery bin 8, and a baffle 15 and a filter 16 are provided inside the recovery bin 8. In this embodiment, the recovery bin 8 is composed of a box body, a baffle 15, a filter 16, etc., to ensure that after the airflow enters, a turbulent area is formed at multiple angles in the recovery bin 8, so as to achieve the purpose of naturally settling particulate matter in the air.

[0047] The backflow cleaning device of the air handling unit is installed in the air inlet section of the air handling unit. According to the actual operating conditions of the air handling unit, after the overpressure alarm of the filter component 5 is sounded, the air conditioner is automatically adjusted to the standby state; the isolation valve 1 before and after the filter component 5 is automatically closed, and the pulse control valve 11 of the first pulse air duct 2 and the second pulse air duct 3 is alternately opened to connect the air source, so as to purge the filter component 5, so that the filter component 5 undergoes forward and reverse deformation in turn, thereby realizing automatic cleaning of the filter material 17 of the filter component 5; at the same time, the recovery component is opened to process the dirty air generated by cleaning the filter material 17; after the backflow cleaning process is completed, the air handling unit is ready for operation.

[0048] Compared with traditional air handling equipment, the air handling unit can realize automatic dust cleaning after adding the air handling unit backflow cleaning device. The pressure difference in the air duct where the filter assembly 5 is installed is always maintained at a low state, which can effectively reduce the fan noise, reduce the fan energy consumption and improve the operating efficiency of the air handling system. Some fresh air handling units are installed at the bottom of the outdoor balcony or in the nearby area, which cannot be directly reached by personnel. Traditional air handling equipment has a great safety hazard when the filter material 17 is replaced; after adding the air handling unit backflow cleaning device, the filter section does not need to be replaced in the short term, and can be maintained at a replacement time of 3 to 5 years, which greatly saves material and labor costs, and also reduces the processing flow after the filter material 17 is replaced, which is more environmentally friendly. The filtering performance of the filter material 17 can be guaranteed, the filtering level can be ensured, the cleanliness of the fresh air can be met, and the indoor air quality can be guaranteed to be excellent.

[0049] Example 2

[0050] In another typical embodiment of the present invention, Figure 1-Figure 3 As shown, a working method of a backflow cleaning device for an air handling unit is provided, using the backflow cleaning device for an air handling unit as in Example 1.

[0051] A working method of a backflow cleaning device for an air handling unit, comprising:

[0052] Close the isolation valve 1 in the upstream and downstream air ducts of the filter assembly 5;

[0053] The first pulse air duct 2 first outputs a pulse airflow through the annular air outlet 4 to disturb the filter assembly 5, causing the attached matter on the filter assembly 5 to fall off, and the first recovery pipe 6 obtains the fallen attached matter and collects it in the recovery bin 8;

[0054] The second pulse air duct 3 outputs pulse airflow through the annular air outlet 4, disturbing the filter assembly 5, causing the attached matter on the filter assembly 5 to fall off, and the second recovery pipe 7 obtains the fallen attached matter and collects it in the recovery bin 8;

[0055] After repeatedly cleaning the filter assembly 5 by the first pulse air duct 2 and the second pulse air duct 3 for several times, the pulse assembly and the recovery assembly are closed;

[0056] Open the isolation valve 1 in the upstream and downstream air ducts of the filter assembly 5.

[0057] The pressure difference in the air duct before and after the filter assembly 5 can be detected first, and when the pressure difference reaches a set value, the pulse assembly and the recovery assembly are turned on to clean the filter assembly 5.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A backflow cleaning device for an air handling unit, characterized in that: include: The isolation valves are respectively installed in the upstream and downstream air ducts of the filter assembly; The pulse assembly is provided with a first pulse air duct and a second pulse air duct, the first pulse air duct is provided with a plurality of annular air outlets connected to the upstream air duct of the filter assembly, and the second pulse air duct is provided with a plurality of annular air outlets connected to the downstream air duct of the filter assembly; The recovery component is provided with a recovery bin, which is connected to the upstream air duct of the filter component through a first recovery pipe, and is connected to the downstream air duct of the filter component through a second recovery pipe. The recovery bin is connected to the air duct and is distributed relative to the annular air outlet.

2. The backflow cleaning device for an air handling unit according to claim 1, characterized in that: A cleaning chamber is formed between the isolation valve and the filter assembly, and the annular air outlet and the recovery bin are respectively connected to the cleaning chamber.

3. The backflow cleaning device for an air handling unit according to claim 2, characterized in that: The first recovery pipe and the second recovery pipe are connected to the cleaning chamber through recovery ports respectively, and the recovery port and the annular air outlet are located on the opposite sides of the air duct.

4. The backflow cleaning device for an air handling unit according to claim 1, characterized in that: A protective net is arranged between the isolation valve and the filter assembly, and the protective net restricts the deformation degree of the filter assembly at the upstream and downstream of the filter assembly respectively.

5. The backflow cleaning device for an air handling unit according to claim 4, characterized in that: In the upstream area or downstream area of ​​the filter assembly, the annular air outlet is located between the protective net and the isolation valve.

6. The backflow cleaning device for an air handling unit according to claim 1, characterized in that: The first pulse air duct and the second pulse air duct are respectively installed with pulse control valves, and the first pulse air duct and the second pulse air duct are connected to a compressed air source.

7. The backflow cleaning device for an air handling unit according to claim 6, characterized in that: The first recovery pipe and the second recovery pipe are respectively installed with a reflux control valve, and the first recovery pipe and the second recovery pipe are connected to the recovery bin through a pipeline fan.

8. The backflow cleaning device for an air handling unit according to claim 7, characterized in that: The pipeline fan is connected to the inlet end of the recovery bin, an insect-proof net is arranged at the outlet end of the recovery bin, and a baffle and a filter net are arranged inside the recovery bin.

9. A method for operating a backflow cleaning device for an air handling unit, using the backflow cleaning device for an air handling unit as claimed in any one of claims 1 to 8, characterized in that: include: Close the isolation valves in the upstream and downstream air ducts of the filter assembly; The first pulse air duct first outputs a pulse airflow through the annular air outlet to disturb the filter component, causing the attached matter on the filter component to fall off, and the first recovery pipe obtains the fallen attached matter and collects it in the recovery bin; The second pulse air duct outputs pulse airflow through the annular air outlet to disturb the filter component, causing the attached matter on the filter component to fall off. The second recovery pipe obtains the fallen attached matter and collects it in the recovery bin; After repeatedly cleaning the filter assembly by the first pulse air duct and the second pulse air duct for multiple times, the pulse assembly and the recovery assembly are closed; Open the isolation valves in the upstream and downstream air ducts of the filter assembly.

10. The working method of the backflow cleaning device of an air handling unit according to claim 9, characterized in that: Detect the pressure difference in the air duct before and after the filter component. When the pressure difference reaches the set value, turn on the pulse component and the recovery component to clean the filter component.

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