A method and structure for defrosting the front windshield of a passenger vehicle

Abstract

The application discloses a blowing method and structure for defrosting of a front windshield of a passenger car. The blowing method comprises the following steps: first, air is delivered to a heating cavity with an air outlet through a pipeline, and a diffusion heating area is formed in the heating cavity; then, the air delivered into the heating cavity passes through the diffusion heating area, flows into a flow channel arranged at the air outlet, is accelerated in the flow channel in a flow direction, and is blown out through the air outlet to directly blow the front windshield. The blowing structure comprises a base and a shell fixed on the base, the shell is in a spiral shape in a side view, a flow channel satisfying Bernoulli's principle is arranged between a spiral starting end and a spiral ending end, and an electric heating wire assembly is fixed on an inner side wall of the shell. The blowing method and structure for defrosting of the front windshield of the passenger car can realize higher output air speed and air volume, smaller heat loss, and better defrosting and defogging effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobiles, and particularly relates to a blowing method and blowing structure for defrosting of a front windshield of a passenger vehicle. BACKGROUND

[0002] At present, the principles of most large bus defrosters are similar, and all use a defroster box installed outside the vehicle near the ground, which contains two high-power turbine fans and an electric heating module. Through 6 to 8 corrugated pipes connected to the air outlet nozzle inside the vehicle, the air outlet area of a single outlet is about 200mm wide to achieve the delivery of air flow at a certain speed and temperature to achieve the purpose of defogging and defrosting.

[0003] The current defroster connects multiple long corrugated pipes for output, and for a single air outlet, the air volume and actual air speed are greatly discounted, and there are uneven distribution and air leakage. Moreover, the air outlet is far from the heat source, resulting in heat loss. This results in a maximum air outlet speed of only 3m / s in actual use, a short device lift, a large speed loss after spraying, a low air flow temperature, and a long defrosting and defogging time, which affects driving safety.

[0004] The invention application with the application number CN2019114162339 discloses an "air outlet structure and vehicle", which includes a blade assembly, the blade assembly includes a first blade assembly and a second blade assembly, the first blade assembly and the second blade assembly can form a channel for air flow, and the first blade assembly is movably arranged on the second blade assembly to open or close the channel. SUMMARY

[0005] The purpose of the present application is to provide a higher output air speed and air volume, less heat loss, and better defrosting and defogging effect.

[0006] To achieve the above technical purpose, the present application provides a blowing method and blowing structure for defrosting of a front windshield of a passenger vehicle, and the technical solution is as follows:

[0007] A blowing method for defrosting of a front windshield of a passenger vehicle,

[0008] First, the incoming air is delivered to the heating cavity with an air outlet through the pipeline, and a diffuse heating zone is formed in the heating cavity;

[0009] Then, the incoming air sent into the heating cavity passes through the diffuse heating zone and flows into the flow channel provided at the air outlet, forms accelerated air outlet in the flow direction through the flow channel, and is blown out through the air outlet, forming direct blowing of the front windshield in the vehicle.

[0010] Further,

[0011] The heating cavity is arranged in a vehicle.

[0012] Further, the heating cavity comprises a base (1) and a shell (2) fixed on the base;

[0013] The shell (2) is helical in side view,

[0014] A flow channel is formed to accelerate the fluid in the flow direction, and is arranged between the start of the helix and the end of the helix in a manner satisfying the Bernoulli principle.

[0015] Further, an electric heating wire assembly (3) is fixed on the inner wall of the shell, and a diffuse heating zone is formed by heating the electric heating wire assembly.

[0016] Further, a first negative pressure grille (4) and a second negative pressure grille (5) are arranged adjacent to the end of the helix and the base,

[0017] The first negative pressure grille (4) is arranged at the proximal end of the air outlet, for forming a negative pressure air inlet outlet;

[0018] The second negative pressure grille (5) is arranged at the distal end of the air outlet, for forming a negative pressure air inlet.

[0019] Further, a gas guiding surface (6) is arranged on the shell, successively from the start of the helix and in the direction of gas flow;

[0020] The base is composed of a first support part (7) and a second support part (8),

[0021] The first support part is arranged to extend from vertically below the end of the helix to vertically below the gas guiding surface (6), forming an acute angle between the first support part and the horizontal plane in the side view projection;

[0022] The second support part (8) is used to fix and support the first support part;

[0023] The final air outlet is formed between the gas guiding surface (6) and the end of the first support part.

[0024] Further, the end of the first support part is arranged as a smooth curved surface.

[0025] Further, the windward angle of the start of the helix is arranged as a rounded corner.

[0026] Further, the flow direction of the incoming air flow and the outgoing air flow of the pipeline transportation are arranged to change by 90 degrees.

[0027] Further, the flow direction of the incoming air flow and the outgoing air flow of the pipeline transportation are arranged to remain unchanged.

[0028] A defrosting blowing structure for a front windshield of a passenger vehicle, comprising:

[0029] a base (1) and a shell (2) fixed on the base;

[0030] The shell (2) is helical in side view, and a flow channel (9) satisfying Bernoulli's principle is formed between the helical starting end and the helical end.

[0031] An electric heating wire assembly (3) is fixed on the inner side wall of the shell.

[0032] Further, the windward angle of the helical starting end is rounded.

[0033] Further, the shell is cylindrical in shape, and air is delivered into the shell through the pipeline from the opening of the side section of the shell.

[0034] Further, the shell is cylindrical in shape with both ends closed, and an air inlet is formed on the shell opposite to the flow channel (9), and air is delivered into the shell from the air inlet through the pipeline.

[0035] Further, a first negative pressure grille (4) and a second negative pressure grille (5) are arranged adjacent to the helical end and the base,

[0036] The first negative pressure grille (4) is arranged near the air outlet, and is used to form a negative pressure air inlet;

[0037] The second negative pressure grille (5) is arranged at the far end of the air outlet, and is used to form a negative pressure air inlet.

[0038] Further, a gas guiding surface (6) is formed on the shell, which is continuous with the helical starting end and in the direction of gas flow;

[0039] The base is composed of a first support part (7) and a second support part (8),

[0040] The first support part is arranged from the vertical below the helical end to the vertical below the gas guiding surface (6), and forms an acute angle between the first support part and the horizontal plane in the side view projection surface;

[0041] The second support part (8) is used to fix and support the first support part;

[0042] The final air outlet is formed between the gas guiding surface (6) and the end of the first support part.

[0043] Further, the end of the first support part is rounded.

[0044] The present invention discloses a blowing method and structure for defrosting the windshield of a passenger vehicle. First, a cylindrical shell is fixedly installed inside the vehicle to form a certain closed space. Then, an electric heating component is fixedly installed on the inner wall of the shell to form diffuse heating of the inner cavity. Then, air is delivered into the shell through a pipe. After entering the shell, the air passes through the diffuse heating zone and then automatically flows into the flow channel set according to Bernoulli's principle. After accelerating in the flow channel, it exits. This arrangement forms a direct blowing of air onto the windshield, resulting in higher output wind speed and less heat loss. At the same time, in order to improve the above technical improvement, a first negative pressure grille is set in conjunction with a second negative pressure grille to make the airflow from the flow channel more stable. A gas guiding surface is set in conjunction with a first support surface to guide the airflow. In order to ensure the wind speed during the guiding process, a first support part is set to extend vertically downward from the end of the spiral to the vertically downward of the gas guiding surface (6), forming an acute angle between the first support part and the horizontal plane on the side projection plane. To reduce resistance and eddies during the process, the windward angle at the starting end of the spiral is rounded, and the end of the first support is a smooth curved surface. To strike a balance between resistance, actual assembly cost, and visibility, the airflow direction is set to change by 90 degrees to maximize ease of implementation and minimize impact on existing vehicle functions. Of course, depending on the specific assembly situation, if there is no impact on other vehicle functions during actual assembly, the airflow direction can remain unchanged. This invention provides a blowing method and structure for defrosting the windshield of a bus, which, through the above-described settings, ultimately creates a higher output airflow velocity and volume, lower heat loss, smoother flow, and less fluctuation in airflow. Attached Figure Description

[0045] Figure 1 A schematic diagram of an overall blowing structure for defrosting the windshield of a passenger vehicle according to the present invention;

[0046] Figure 2 for Figure 1 Side view.

[0047] 1-Base;

[0048] 2-Outer shell;

[0049] 3-Heating wire assembly;

[0050] 4-First negative pressure grille;

[0051] 5-Second negative pressure grille;

[0052] 6-Gas guiding surface;

[0053] 7-First support section;

[0054] 8 - second support portion;

[0055] 9 - flow channel;

[0056] 10 - wind angle;

[0057] 11 - air outlet;

[0058] 12 - outside of air flow guide surface;

[0059] 13 - inside of air flow guide surface. DETAILED DESCRIPTION

[0060] Hereinafter, a passenger car windshield defrosting blowing method and a blowing structure thereof will be further described in detail according to the accompanying drawings and the specific embodiments.

[0061] To achieve a passenger car windshield defrosting blowing method, the specific embodiments are as follows: Figure 1 、 2The invention illustrates a defrosting structure for a passenger vehicle's windshield. Through this structure, incoming air is first delivered via a pipe to a heating chamber with an outlet, where a diffused heating zone is formed by heating via a heating wire assembly. The incoming air then passes through the diffused heating zone and flows into a channel at the outlet. This channel accelerates the airflow in the flow direction before it is blown out through the outlet, directly blowing air onto the windshield inside the vehicle. This is the most basic configuration and improvement of this technical solution. The heating chamber includes a base (1) and a shell (2) fixed to the base. The shell (2) has a spiral shape in its side view, forming a flow channel that accelerates the fluid in the flow direction, and is positioned between the beginning and end of the spiral in a manner that satisfies Bernoulli's principle. A first negative pressure grille (4) and a second negative pressure grille (5) are provided adjacent to each other between the end of the spiral and the base. The first negative pressure grille (4) is located near the air outlet and is used to form a negative pressure air inlet. The second negative pressure grille (5) is located at the far end of the air outlet and is used to form a negative pressure air inlet. A gas guiding surface (6) is provided on the outer shell, continuing from the starting end of the spiral and along the direction of gas flow. The base is composed of a first support part (7) and a second support part (8). The first support part is formed to extend from the vertically below the end of the spiral to the vertically below the gas guiding surface (6), forming an acute angle between the first support part and the horizontal plane on the side projection plane. The second support part (8) is used to fix and support the first support part. The final air outlet is formed between the gas guiding surface (6) and the end of the first support part. The end of the first support part is a smooth curved surface, and the windward angle of the starting end of the spiral is rounded. The airflow direction in the pipeline can be set to change by 90 degrees or remain constant. While the constant flow direction is preferred, considering the lack of impact on other functions within the vehicle, in practice, a 90-degree angle setting is found to be the better solution under current vehicle conditions.

[0062] The following is combined with Figure 1 , 2 The following is a detailed description of the blowing structure for defrosting the windshield of a bus according to the present invention. The following description is based on the fact that the air inlet and outlet flow directions change by 90 degrees.

[0063] 2 is the outer shell, which provides a specific shape and structure to achieve the original design intention of the product. At the same time, it serves as a sealed cavity to prevent airflow from escaping. The outer shell of this invention is cylindrical, with Φ = 72mm and wall thickness t1 = 2-3mm.

[0064] 3 is the heating wire assembly, the covering angle is 180°-290°, and the total length s=400-450 mm. It is installed on the shell 2 by using high-temperature-resistant adhesive, and functions to generate heat after being powered on and to be taken away by the incoming airflow to the target equipment;

[0065] 10 is the windward angle, which is provided with a rounded corner and is tangent to the adjacent curve. The function is to integrate and guide the air in the shell to the flow channel at the rear end based on the Bernoulli principle. Greater wind pressure and wind speed are outputted;

[0066] 9 is the flow channel formed based on the Bernoulli principle, including an inlet and an outlet, and the total width of the inlet l1=3.5-4 mm. The main function is to converge the airflow and press the airflow backward to increase the speed by using the wind pressure at the front end; the total width of the outlet l4=2-2.5 mm. This part is the air outlet in the shell, and the speed of the airflow is increased through the structure of the front end being large and the rear end being small.

[0067] 5 is the second negative pressure grille, which is used for the negative pressure inlet and has a total width l2=8 mm. The main function is to support the shell and be connected with the base 1. The secondary function is to integrate the airflow and reduce the instability of the airflow;

[0068] 4 is the first negative pressure grille, which is used for the negative pressure outlet and has a total width l3=5 mm. The first negative pressure grille cooperates with the second negative pressure grille 5 and has the same function as the second negative pressure grille 5;

[0069] 7 is the end of the first supporting part, which is provided with a smooth curved surface with an arc radius R15 and is tangent to the inclined surface of the base. The purpose is to reduce the outlet resistance.

[0070] 11 is the final air outlet, which has a width t2=6-7 mm.

[0071] 12 is the outer side of the airflow guide surface, which is provided with an arc part with a radius R500 and is tangent to the curve 11 of the inner side of the guide surface. The outermost part is a straight line tangent to the outer side of the airflow guide surface, and the length of the straight line is 7.5 mm. The purpose of the guide surface is to give the airflow a certain direction as much as possible, reduce the vortex formed on the upper part of the outlet after the airflow is sprayed, and reduce the kinetic energy of the gas.

[0072] 13 is the inner side of the airflow guide surface, which is provided with an arc with a radius R80 and is tangent to the curve 10 of the outer side, and serves as a transition between the shell 1 and the gas spraying.

[0073] At the beginning of the design of the device, the gas is set as an ideal fluid. The reason is that the airflow speed in the working state of the device is much smaller than 1 Mach number. Although the air density is small, even a very small pressure difference can make the local air be compressed and the density increase, but the air mass with increased density can immediately flow to the place with smaller density, so the air density change in this system is very small, so the air can be regarded as incompressible and non-viscous, which can simplify the problem and bring great convenience to the design of the device.

[0074] The gas that the device passes through is subsonic, so the gas flow rate is inversely proportional to the cross-sectional area. Under the premise that the mass flow rate of the front end and the temperature of the gas change little, the smaller the cross-sectional area through which the gas flows, the faster the flow rate. The pressurizing and accelerating structure 4 of the device uses this principle to achieve the acceleration treatment of the gas before it is sprayed out. However, the contraction area should not be too small, otherwise the resistance will be greatly increased, causing the gas flow to be sprayed out poorly.

[0075] According to Bernoulli's basic formula:

[0076] Wherein:

[0077] p is the pressure of a point in the fluid;

[0078] v is the flow rate of the fluid at that point;

[0079] ρ is the density of the fluid;

[0080] g is the standard gravity acceleration;

[0081] c is a constant.

[0082] It can be seen that the sum of the pressure energy and the gravitational potential energy of the fluid, i.e. the kinetic energy, is a constant. The mass of the gas is light, and the height difference before and after work changes little, so the gravitational potential energy can generally be ignored. According to the formula, it can be deduced that the flow rate of the fluid increases, and the pressure of the object at the interface is smaller. The device uses the above phenomenon to use the high-speed sprayed gas to form a low-pressure area, and the air around the device is relatively static, with a slow flow rate and a high pressure. In physical phenomena, high-pressure gas will move to low-pressure gas areas. That is, in the mixing chamber of the device, the high-speed low-pressure gas will suck in the low-speed high-pressure gas and spray it out of the outlet together. This approach may cause the temperature of the gas heated in the device to drop a little, but increasing the air flow rate can bring better defrosting and demisting effects. After research, every kilogram of air can contain 49.52 grams of water vapor at 40 degrees Celsius, so even if new low-pressure air is mixed in to cause the gas temperature to drop, the amount of gas sprayed out will also increase, essentially allowing more water vapor to be carried away.

[0083] Accordingly, the arrangement of the blowing structure is completed,

[0084] 1. The heating module can be integrated to be closer to the glass or other devices that need to be defrosted and demisted, with less heat loss and high efficiency. At the same time, the 12-24V electric heating module can be replaced, without the need for high-voltage electricity, and the wiring is simple;

[0085] 2. The device is installed in the vehicle, and the original defroster high-voltage module installed near the ground outside the vehicle can be abandoned, without worrying about the risk of water ingress and short circuit, and with higher electrical safety;

[0086] 3. With aerodynamics and Bernoulli principle, under the premise of the same air input mass flow rate, the output wind speed and volume are higher, the range is wider, and the defrosting and demisting effect is good.

Claims

1. A blowing method for defrosting the windshield of a passenger vehicle, characterized in that: First, air is supplied through the set pipeline to the set heating cavity with air outlet, and a diffuse heating zone is formed in the heating cavity; Then, the air intake sent into the heating chamber passes through the diffusion heating zone and flows into the flow channel located at the air outlet. After the air is accelerated in the flow direction through this flow channel, it is blown out through the air outlet to form a direct airflow to the windshield inside the vehicle. The heating cavity includes a base (1) and a shell (2) fixed on the base. The outer shell (2) is spiral in side view and forms a flow channel for fluid acceleration in the flow direction, which is set between the beginning and end of the spiral in a manner that satisfies the Bernoulli principle. An adjacent first negative pressure grid (4) and a second negative pressure grid (5) are provided between the end of the spiral and the base. The first negative pressure grille (4) is located at the near end of the air outlet to form a negative pressure air inlet and outlet; The second negative pressure grille (5) is located at the far end of the air outlet to form a negative pressure air inlet; A gas guiding surface (6) is formed on the outer shell, continuing from the starting end of the spiral and along the direction of gas flow. The base is composed of a first support part (7) and a second support part (8). The first support portion is formed to extend vertically downward from the vertically below the end of the spiral towards the vertically below the gas guiding surface (6), forming an acute angle between the first support portion and the horizontal plane on the side view projection plane; The second support part (8) is used to fix and support the first support part; A final air outlet is formed between the gas guiding surface (6) and the end of the first support portion; The outer shell is cylindrical in shape, and air is supplied through a pipe at the side opening of the outer shell; Both ends of the outer shell are closed, and an air inlet is formed on the side of the outer shell opposite to the flow channel (9), and air is delivered into the outer shell through the pipe from the air inlet.

2. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: The heating chamber is located inside the vehicle.

3. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: A heating wire assembly (3) is fixed on the inner wall of the outer shell, and a diffuse heating zone is formed by heating the heating wire assembly.

4. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: The end of the first support portion is designed with a smooth curved surface.

5. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: The windward angle at the starting end of the spiral is rounded.

6. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: The airflow direction of the pipeline is changed at a 90-degree angle to the airflow direction at the inlet.

7. The blowing method for defrosting the windshield of a passenger vehicle according to claim 1, characterized in that: The air inlet and outlet directions of the pipeline are set to remain constant.

8. A blowing structure for defrosting the windshield of a passenger vehicle, characterized in that: Including: Base (1) and outer shell (2) fixed on the base; The outer shell (2) is spiral in side view, and a flow channel (9) that satisfies Bernoulli's principle is provided between the starting end and the end end of the spiral. A heating wire assembly (3) is fixed on the inner wall of the outer casing. The outer shell is cylindrical in shape, and air is supplied through a pipe at the side opening of the outer shell; Both ends of the outer shell are closed, and an air inlet is formed on the side of the outer shell opposite to the flow channel (9), and air is supplied from the air inlet into the outer shell through the pipeline; A gas guiding surface (6) is formed on the outer shell, continuing from the starting end of the spiral and along the direction of gas flow. The base is composed of a first support part (7) and a second support part (8). The first support portion is formed to extend vertically downward from the vertically below the end of the spiral towards the vertically below the gas guiding surface (6), forming an acute angle between the first support portion and the horizontal plane on the side view projection plane; The second support part (8) is used to fix and support the first support part; The final air outlet is formed between the gas guiding surface (6) and the end of the first support portion.

9. A blowing structure for defrosting the windshield of a passenger vehicle according to claim 8, characterized in that: The windward angle at the starting end of the spiral is rounded.

10. A blowing structure for defrosting the windshield of a passenger vehicle according to claim 8, characterized in that: An adjacent first negative pressure grid (4) and a second negative pressure grid (5) are provided between the end of the spiral and the base. The first negative pressure grille (4) is located at the near end of the air outlet to form a negative pressure air inlet and outlet; The second negative pressure grille (5) is located at the far end of the air outlet and is used to form a negative pressure air inlet.

11. The blowing structure for defrosting the windshield of a passenger vehicle according to claim 8, characterized in that: The end of the first support portion is designed with a smooth curved surface.

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