Efficient air conditioner filtering system for new energy automobile

Abstract

The invention relates to the technical field of new energy automobile air conditioners, in particular to an efficient air conditioner filtering system for a new energy automobile. The device is composed of an air inlet pipe, a bend, a honeycomb device, a test chamber, an air outlet pipe and a control device, the control device controls gas to enter from the air inlet pipe and enter the test chamber through the bend, and the gas passing through the test chamber is filtered by the honeycomb device and then sent into the new energy vehicle through the air outlet pipe. And establishing a CFD three-dimensional calculation model based on the air conditioner filtering system, carrying out wind fluid simulation calculation, and analyzing the influence of the honeycomb structure and the test room curve structure on the filtering performance according to the simulation calculation result, so that the adjustment of the filtering system parameters is realized, and the optimization of the filtering system is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle air conditioning, and in particular to a high-efficiency air conditioning filtering system for new energy vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, the air quality in the car has become a focus of increasing attention for consumers. The air filter system of new energy vehicles inhales the outside air and blocks the dust through the filter, so that the gas is purified and enters the interior of the new energy vehicle for heat dissipation. The traditional automobile air conditioning filter has been difficult to meet the high requirements of modern automobiles for air purification in terms of filtration efficiency, dust holding capacity and service life. Especially in the context of the epidemic, it is particularly important to develop an efficient air conditioning filtration system with antiviral function. Although there are some high-efficiency filtration products on the market, they often have low filtration efficiency, large resistance, short service life, no antiviral, and inability to evaluate the filtration performance of the air conditioning filter to complete the optimization. Therefore, the present invention proposes a honeycomb device that combines new materials such as non-woven fabrics, activated carbon, and antibacterial and anti-allergic coatings, and establishes a three-dimensional model of the filtration system for simulation calculation of a high-efficiency air conditioning filtration system for new energy vehicles. Summary of the invention

[0003] The present invention provides a high-efficiency air-conditioning filter system for new energy vehicles, which is used to solve the technical problems of low filtration efficiency, large flow resistance, short service life, inability to resist viruses and inability to evaluate and optimize air-conditioning filtration performance of existing high-efficiency air-conditioning filter systems for new energy vehicles.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a high-efficiency air-conditioning filtration system for new energy vehicles, consisting of an air inlet pipe, a bend, a honeycomb, a test chamber, an air outlet pipe, and a control device. The control device controls the gas to enter from the air inlet pipe and enter the test chamber through the bend. The gas passing through the test chamber is filtered by the honeycomb and then sent into the new energy vehicle through the air outlet pipe. A CFD three-dimensional calculation model is established based on the air-conditioning filtration system to perform wind flow simulation calculations. According to the simulation calculation results, the influence of the honeycomb structure and the bend structure of the test chamber on the filtration performance is analyzed, thereby realizing the adjustment of the filtration system parameters and completing the optimization of the filtration system.

[0005] Furthermore, the honeycomb device includes an air conditioning filter, and the air conditioning filter is an anti-viral and high-efficiency CN95 automobile air conditioning filter.

[0006] Furthermore, the filter element of the air conditioning filter is made of non-woven fabric, sprayed velvet fabric, and sparse substrate, and the above three are made by ultrasonic method. The non-woven fabric is the same as the non-woven fabric material of N95 mask.

[0007] Furthermore, the filter element of the air conditioning filter also includes activated carbon and an antibacterial and anti-allergic layer.

[0008] Furthermore, the calculation process of the CFD calculation model of the air conditioning filtration system is as follows:

[0009] 1) Model establishment: Establish a system simulation 3D model based on the simulation software Fluent;

[0010] 2) Meshing: Save the three-dimensional model in stp format and import it into finite element pre-processing software for meshing. Since the wind flow grid needs to be divided, the surface grid is divided into triangular grids;

[0011] 3) Parameter setting: Set the velocity equation to the absolute equation, set the time to the steady-state form, and select the standard k-ε-D model for the wind turbulence model, where k is the turbulent kinetic energy equation and ε is the dissipation rate equation;

[0012] 4) Simulation calculation: Run the CFD calculation model to perform wind flow simulation calculation;

[0013] 5) Result analysis: Based on the simulation calculation results, the filtering performance of the filtering system is verified, so as to adjust the parameters to optimize the filtering system.

[0014] Furthermore, the initial conditions and boundary conditions of the CFD calculation model are a grid model of a buzzer, a test room, and a curve as a boundary.

[0015] Furthermore, the control parameters of the CFD calculation model include the air inlet duct inlet velocity, flow rate, air density, wind turbulence intensity, bend diameter, air inlet duct flow rate 300m 3 / h and the curve diameter is 0.2m. The speed at the entrance and exit of the curve is measured to be 2.653m / s. The wind turbulence intensity is calculated based on the turbulence intensity formula and the Reynolds number, and the outlet boundary condition is set to outd low.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The CN95 air conditioning filter of the present invention can achieve a filtration efficiency of more than 95% for 0.3 μm non-oily particles. The surface of the meltblown cloth is composited with a sparse substrate by ultrasound or hot melt adhesive, which can reduce resistance and increase dust holding capacity.

[0018] (2) The present invention establishes a device model based on the simulation software Fluent, and at the same time establishes a CFD calculation model of the detection device, completes the simulation calculation of the filtration system, and selects appropriate parameters to optimize the filtration performance of the filtration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure numerals: 1. air inlet pipe; 2. bend; 3. test chamber; 4. honeycomb; 5. air outlet pipe; 6. control device.

[0020] Figure 1 This is a diagram of the new energy vehicle air conditioning filtration system device of the present invention;

[0021] Figure 2 This is a structural diagram of the honeycomb device of the present invention;

[0022] Figure 3 This is the structural diagram of the inlet bend of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] like Figure 1 As shown, a high-efficiency air conditioning filtration system for new energy vehicles is composed of an air inlet pipe, a bend, a honeycomb, a test chamber, an air outlet pipe, and a control device. The control device controls the gas to enter from the air inlet pipe, enter the test chamber through the bend, and the gas passing through the test chamber is filtered by the honeycomb, and then sent into the new energy vehicle through the air outlet pipe. A CFD three-dimensional calculation model is established based on the air conditioning filtration system to perform wind flow simulation calculation. According to the simulation calculation results, the influence of the honeycomb structure and the bend structure of the test chamber on the filtration performance is analyzed, thereby realizing the adjustment of the filtration system parameters and completing the optimization of the filtration system.

[0025] Specifically, the honeycomb includes an air conditioning filter, which is an antiviral and high-efficiency CN95 automobile air conditioning filter. The filter element is made of non-woven fabric, sprayed velvet fabric, and sparse substrate. The above three are made by ultrasonic or hot melt adhesive fusion. The non-woven fabric is the same as the non-woven fabric material of the N95 mask, and also contains activated carbon and antibacterial and anti-allergic layers.

[0026] Non-woven fabrics have the characteristics of uniform fiber distribution, small pore size, and good air permeability. They can effectively filter tiny germs and harmful substances by using the principle of electrostatic adsorption. In addition, non-woven fabrics also have good mechanical strength and wear resistance, which can meet the requirements of automobile air conditioning filters. Activated carbon has excellent adsorption properties and can absorb odors, formaldehyde and other harmful gases in the air; antibacterial and anti-allergic coatings can inhibit the growth of microorganisms such as bacteria and viruses, reduce the concentration of allergens, and thus ensure the overall improvement of the air quality in the car.

[0027] The present invention uses ultrasound or hot melt adhesive to composite the meltblown cloth with a layer of sparse substrate. The sparse substrate has the characteristics of sparse fiber distribution and good air permeability, which can reduce the flow resistance and increase the dust holding capacity. At the same time, the composite technology can also enhance the mechanical strength of the filter element and extend its service life.

[0028] The CN95 air conditioning filter can achieve a filtration efficiency of more than 95% for 0.3μm non-oily particles. Among them, the CN95 filter element material plays a major role, and the performance of the meltblown cloth plays a decisive role in the filter material. The surface of the meltblown cloth is compounded with a layer of sparse substrate by ultrasound or hot melt adhesive, which can reduce resistance and increase dust holding capacity.

[0029] The non-woven fabric + meltblown fabric are fused by ultrasonic method. "1-aB" indicates that the base material 1 + a type meltblown fabric is selected, and the filter element material is made by B ultrasonic fusion method.

[0030] like Figure 2 As shown, the specific structure of the honeycomb is set, and the air conditioning filter is set on the surface of the honeycomb to form a complete filtering structure.

[0031] The calculation process of the CFD calculation model of the air conditioning filtration system is as follows:

[0032] 1) Model establishment: Establish a system simulation 3D model based on the simulation software Fluent;

[0033] 2) Meshing: Save the three-dimensional model in stp format and import it into finite element pre-processing software for meshing. Since the wind flow grid needs to be divided, the surface grid is divided into triangular grids;

[0034] 3) Parameter setting: Import the fluid grid into the comsol software, then enter the setting module to set the solver. Select the pressure-based solver form, the velocity equation as the absolute equation, and the time as the steady-state form. Select the standard k-ε-D model as the turbulence model, where k is the turbulent kinetic energy equation and ε is the dissipation rate equation.

[0035] like Figure 3 As shown, since the outlet of the pipeline uses a fan to extract air, the air inlet flow is 300m 3 / h. Since the diameter of the curve is 200mm, the velocity formula at the entrance is: V = Q / S, where Q is the flow rate and S is the cross-sectional area. Substituting into the formula, the velocity at the entrance and exit of the curve is 2.653m / s. The turbulence intensity formula is where Re is the Reynolds number, ρ is the density of the fluid. The gas in the test channel is air, ρ = 1.225 kg / m 3; ν is the average velocity of the fluid, v=2.653m / s; d is the diameter of the duct, d=0.2m; μ is the dynamic viscosity coefficient of the fluid, u=1.7894x10-5kg / m·s, and the outlet boundary condition is set to outd low.

[0036] 4) Simulation calculation: Run the CFD calculation model to perform wind flow simulation calculation; the wind turbulence model selects the standard k-ε-D model with the specific formula as follows:

[0037] The turbulent kinetic energy ε dissipation rate equation is: Among them, μ i is the laminar viscosity coefficient, μ t is the turbulent viscosity coefficient, G m is the turbulent kinetic energy generated by the laminar velocity gradient, G n is the turbulent kinetic energy generated by buoyancy, C lξ , C 2ξ , C 3ι , σ k , σε are empirical constants, with values ​​of 1.44, 1.92, 1.55, 1, and 1.3 respectively; and C μ is the turbulence constant and its value is 0.09.

[0038] The specific calculation process of turbulent viscosity coefficient is:

[0039] 5) Result analysis: Based on the simulation calculation results, the filtering performance of the filtering system is verified, so as to adjust the parameters to optimize the filtering system.

[0040] The parameters of the honeycomb of the present invention include the shape, length and side length of the honeycomb grid. By analyzing the air velocity trajectory line diagram, cross-sectional velocity cloud diagram, cross-sectional velocity deviation coefficient and honeycomb upper and lower pressure distribution diagram of the equipment pipeline after the honeycomb with different structures. It can be seen that the upper and lower pressure difference of the honeycomb is not large in various cases, so it is not necessary to consider its upper and lower pressure; in addition, it is found that the length, shape and hole size of the honeycomb grid can affect the uniformity of the air velocity in the test room. After comprehensive consideration, the parameters of the honeycomb installed in the test room are determined as follows: the grid cross-sectional shape is circular, the grid length is 30mm, and the grid side length is 15mm.

[0041] The CFD model established by the present invention analyzes the effect of the test room bend structure parameters on the performance of the filter detection device. By analyzing the air velocity trajectory diagram, cross-sectional velocity cloud diagram and cross-sectional velocity deviation coefficient in the equipment pipeline, it is found that the air velocity uniformity in the test room is poor. After analysis, two structures that cause the poor air velocity uniformity in the test room are found. It is found that the air velocity uniformity in the test room can be improved by adding a transition radius inside the bend and installing a honeycomb in the test room.

[0042] The present invention aims at the characteristics of new energy vehicles and combines a honeycomb device and a CFD model to calculate a specific filtering system with the best filtering performance.

[0043] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A high-efficiency air conditioning filtration system for new energy vehicles, characterized in that: The system is composed of an air inlet pipe, a bend, a honeycomb, a test chamber, an air outlet pipe, and a control device. The control device controls the gas to enter from the air inlet pipe, enter the test chamber through the bend, and the gas passing through the test chamber is filtered by the honeycomb, and then sent into the new energy vehicle through the air outlet pipe. A CFD three-dimensional calculation model is established based on the air conditioning filtration system to perform wind flow simulation calculations. According to the simulation calculation results, the influence of the honeycomb structure and the bend structure of the test chamber on the filtration performance is analyzed, thereby realizing the adjustment of the filtration system parameters and completing the optimization of the filtration system.

2. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 1, characterized in that: The honeycomb device includes an air conditioning filter, and the air conditioning filter is an anti-viral and high-efficiency CN95 automobile air conditioning filter.

3. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 2, characterized in that: The filter element of the air conditioning filter is made of non-woven fabric, sprayed velvet cloth and sparse substrate, and the above three are made by ultrasonic method. The non-woven fabric is the same as the non-woven fabric of N95 mask.

4. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 3, characterized in that: The filter element of the air conditioning filter also includes activated carbon and an antibacterial and anti-allergic layer.

5. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 1, characterized in that: The calculation process of the CFD calculation model of the air conditioning filtration system is as follows: 1) Model establishment: Establish a system simulation 3D model based on the simulation software Fluent; 2) Meshing: Save the three-dimensional model in stp format and import it into finite element pre-processing software for meshing. Since the wind flow grid needs to be divided, the surface grid is divided into triangular grids; 3) Parameter setting: Set the velocity equation to the absolute equation, set the time to the steady-state form, and select the standard k-ε-D model for the wind turbulence model, where k is the turbulent kinetic energy equation and ε is the dissipation rate equation; 4) Simulation calculation: Run the CFD calculation model to perform wind flow simulation calculation; 5) Result analysis: Based on the simulation calculation results, the filtering performance of the filtering system is verified, so as to adjust the parameters to optimize the filtering system.

6. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 5, characterized in that: The initial conditions and boundary conditions of the CFD calculation model are the grid models of the buzzer, the test room, and the curve as the boundary.

7. A high-efficiency air conditioning filtration system for new energy vehicles according to claim 5, characterized in that: The control parameters of the CFD calculation model include the inlet velocity, flow rate, air density, wind turbulence intensity, bend diameter, inlet flow rate 300m 3 / h and the curve diameter is 0.2m. The speed at the entrance and exit of the curve is measured to be 2.653m / s. The wind turbulence intensity is calculated based on the turbulence intensity formula and the Reynolds number, and the outlet boundary condition is set to outdlow.

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