Radar heating cover plate adopting bimetallic strip type overheat protector and automobile

Abstract

The utility model belongs to the field of automobiles, and particularly relates to a radar heating cover plate adopting a bimetallic strip type overheat protector and an automobile, which comprise a radar cover plate and a heating assembly, the heating assembly comprises a heating wire, a diaphragm and a bimetallic strip type overheat protector; the heating wire is embedded in the diaphragm; the bimetallic strip type overheat protector is connected in series in a heating circuit of the heating wire; and the heating assembly is embedded on the radar cover plate. Compared with the prior art, the problem that in the prior art, overheating protection is unreliable due to the fact that an electric control system needs to be used for achieving overheating protection is solved, overheating protection is achieved in a physical structure mode, automatic disconnection can be achieved when the temperature exceeds the upper limit of the temperature range, and automatic connection can be achieved when the temperature recovers to the temperature range.

Description

Technical Field

[0001] This utility model belongs to the automotive field, specifically relating to a radar heating cover plate using a bimetallic strip overheat protector and an automobile. Background Technology

[0002] As the level of automotive intelligence continues to improve, the number of intelligent radars deployed on vehicles is also increasing. The radar is hidden behind a cover plate. In cold regions and weather conditions, it is necessary to ensure that the surface of the radar cover plate is free from ice and snow that may affect the radar function. Therefore, the radar cover plate surface needs to be equipped with a heating function.

[0003] Currently, some covers lack overheat protection. For example, CN110635240A discloses a heated radar cover structure and its manufacturing method. Although it can defrost and thaw using heating wires, it does not consider overheat protection, which can easily lead to component damage. Covers with overheat protection typically use a circuit board with temperature control via injection molding around the heating wire or add a temperature sensor to provide temperature feedback to the vehicle ECU for on / off control. For example, CN219016569U discloses a heated radar cover with overheat protection, which is connected to the vehicle controller via a pin. The vehicle controller controls the heating wire based on vehicle speed, outside temperature, and thermistor.

[0004] However, both methods have relatively high structural complexity and cost, and the insert injection molding scheme can lead to shrinkage defects in appearance. In addition, both schemes require ECU (electronic controller) for feedback control, which has complex control logic and is prone to misjudgment, false judgment, and missed judgment, resulting in a high failure frequency.

[0005] Therefore, it is necessary to develop a physical structure that can achieve overheat protection in order to avoid or reduce the process of program judgment. Utility Model Content

[0006] The purpose of this utility model is to solve at least one of the above problems by providing a radar heating cover plate and automobile using a bimetallic strip overheat protector, so as to solve the unreliability problem of relying on the electronic control system to achieve overheat protection in the prior art. This solution achieves overheat protection through physical structure, which can automatically disconnect when the temperature exceeds the upper limit of the temperature range, and automatically reconnect when the temperature returns to the temperature range.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] The first aspect of this utility model discloses a radar heating cover plate using a bimetallic strip overheat protector, including a radar cover plate and a heating assembly;

[0009] The heating assembly includes a heating wire, a diaphragm, and a bimetallic strip overheat protector;

[0010] The heating wire is embedded inside the diaphragm;

[0011] The bimetallic strip overheat protector is connected in series in the heating circuit of the heating wire;

[0012] The heating assembly is fitted into the radar cover plate.

[0013] The bimetallic strip overheat protector includes a temperature sensing part, a bimetallic switch hidden inside the temperature sensing part, and two electrodes extending outward from both sides of the temperature sensing part (the electrodes are connected to the bimetallic switch). The electrodes and the heating wire are welded together.

[0014] The electrodes are connected in series in the heating circuit of the heating wire;

[0015] The temperature sensing element is attached tightly to the diaphragm using thermally conductive silicone grease.

[0016] Preferably, the bimetallic strip overheat protector is welded to the heating wire via electrodes.

[0017] Preferably, the diaphragm has at least one pair of openings, the heating wire passes through the openings, and the electrode is welded to the heating wire at the opening.

[0018] Preferably, the electrodes are arranged symmetrically with respect to the bimetallic strip overheat protector.

[0019] Preferably, the heating assembly further includes a protector cover plate, which is mounted on the outside of the bimetallic strip overheat protector and is welded to the diaphragm.

[0020] Preferably, the bimetallic strip overheat protector is snapped into the inside of the protector cover to ensure welding strength and sealing.

[0021] Preferably, the heating assembly further includes a connector, which is welded to the diaphragm and connected to one end of the heating wire.

[0022] Preferably, the membrane is a PC membrane.

[0023] Preferably, the radar cover is a PC panel.

[0024] The second aspect of this utility model discloses an automobile in which a radar heating cover as described above is mounted on the vehicle body.

[0025] The working principle of this utility model is as follows:

[0026] This solution provides an arrangement structure for a radar heating cover plate based on a bimetallic strip overheat protector. It utilizes the principle of bimetallic strip deformation under heat, connecting the overheat protector in series with the heating path. The temperature detection area (electrode end) of the overheat protector is in close contact with the heating wire. When the detected temperature reaches the set protection temperature, the bimetallic strip switch in the overheat protector automatically opens, cutting off the power to the entire heating circuit. When the temperature drops back to a safe range, the bimetallic strip switch automatically resets, reconnecting the heating circuit.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This utility model discloses an arrangement structure for a radar heating cover plate based on a bimetallic strip overheat protector. While ensuring the snow removal and defrosting function of the radar cover plate surface, it can automatically detect the temperature during abnormal heating and disconnect the circuit when the temperature exceeds the target temperature, thus protecting the components from damage.

[0029] The structure of this invention ensures that the product can perform heating, defrosting, and de-icing functions while controlling the heating temperature to always be below the material's destructive temperature, effectively preventing damage to the parts.

[0030] The structure of this utility model has a service life of over 100,000 cycles.

[0031] Because of its simple structure, the heating circuit does not rely on external signal input to switch on and off, which greatly reduces the probability of errors. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the radar heating cover plate.

[0033] Figure 2 An exploded view of the radar heating cover plate.

[0034] Figure 3 This is a schematic cross-sectional view of a bimetallic strip overheat protector.

[0035] In the diagram: 1-Radar cover; 2-Heating wire; 3-Diaphragm; 4-Connector; 5-Bimetallic strip overheat protector; 6-Protector cover. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] A radar heating cover plate employing a bimetallic strip overheat protector 5, such as Figure 1-3 As shown, it includes radar cover 1 and heating assembly;

[0039] The heating assembly includes a heating wire 2, a diaphragm 3, and a bimetallic strip overheat protector 5;

[0040] The heating wire 2 is embedded inside the diaphragm 3;

[0041] The bimetallic strip overheat protector 5 is connected in series in the heating circuit of the heating wire 2;

[0042] The heating assembly is fitted onto the radar cover plate 1.

[0043] More specifically, in this embodiment:

[0044] like Figure 1-3 As shown, the radar heating cover is composed of a radar cover 1 made of PC material and an integrated heating assembly injection molded on the radar cover 1. The heating assembly is further composed of a diaphragm 3 made of PC material, a heating wire 2, a bimetallic strip overheat protector 5, a connector 4 and a protector cover 6.

[0045] Heating wire 2 is embedded inside diaphragm 3. Bimetallic strip overheat protector 5 is soldered onto heating wire 2 to connect in series with the heating circuit containing heating wire 2. Bimetallic strip overheat protector 5 is assembled within protector cover plate 6 and soldered onto diaphragm 3 as an assembly. Protector cover plate 6 is located outside bimetallic strip overheat protector 5 and is soldered and fixed to diaphragm 3, with a snap-fit ​​connection between protector cover plate 6 and bimetallic strip overheat protector 5. Bimetallic strip overheat protector 5 consists of a central temperature sensing section and a pair of electrodes symmetrically arranged, one end connected to the bottom surface of the temperature sensing section. A bimetallic switch for overheat protection is located inside the temperature sensing section. Thermally conductive silicone grease is filled between the top surface of the temperature sensing section and diaphragm 3. Electrodes extend outwards from both sides of the temperature sensing section, one end connected to the bottom surface of the support section and the bimetallic switch between the two electrodes. The other end of the metal strip extends outwards from the edge of the support section in a Z-shape and is soldered to heating wire 2. Specifically... Figure 2 , 3 As shown, an opening is provided on the diaphragm 3 at the position where the bimetallic overheat protector 5 contacts the heating wire 2. The heating wire 2 passes through the opening, and the electrode on the bimetallic overheat protector 5 is welded to the heating wire 2 at the opening to form a series connection.

[0046] The protector cover 6 can be a waterproof and dustproof cover. Since it is welded to the diaphragm 3, its internal space can have an IP67 waterproof rating. This can minimize the temperature difference between the bimetallic overheat protector 5 and the heating wire 2 (reduce energy dissipation) and achieve effective waterproof and dustproof protection in the internal space. This improves the accuracy of temperature measurement (improves on / off sensitivity) and extends the service life (reduces environmental impact).

[0047] The connector 4 is soldered onto the diaphragm 3 and is electrically connected to one end of the heating wire 2. It can then be connected to an external power supply circuit to supply power to the heating wire 2.

[0048] The heating assembly is integrally attached to the radar cover 1 as an insert via injection molding, forming a unified structure.

[0049] In the actual manufacturing (assembly) process, the heating wire 2 is first embedded in the diaphragm 3. After the bimetallic strip overheat protector 5 and the protector cover plate 6 are installed together, they are welded to the diaphragm 3. The connector 4 is then welded to the diaphragm 3 to form the heating assembly. Finally, the formed heating assembly is injection molded into the radar cover plate 1 as an insert to form the radar heating cover plate of this embodiment.

[0050] This bimetallic strip overheat protector 5 operates independently, without relying on the temperature signal received by the temperature sensor from the vehicle ECU to control the opening and closing of the heating circuit, thus avoiding overheat protection failure caused by system errors, temperature sensor errors, and other factors.

[0051] The bimetallic strip overheat protector 5 mentioned above is a commercially available product, and its specific structure is not an improvement of this solution.

[0052] The heating circuit, external power supply circuit, and other structures not specifically described above can all adopt existing technologies and are not part of the improvements in this solution.

[0053] Example 2

[0054] A car uses the radar heating cover in Embodiment 1. Specifically, the radar heating cover is mounted on the car body and located in front of the radar transmission direction. It is used to hide and protect the radar while realizing the functions of snow removal, de-icing, defrosting and overheat protection.

[0055] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A radar heating cover plate employing a bimetallic strip overheat protector, characterized in that, Includes radar cover (1) and heating assembly; The heating assembly includes a heating wire (2), a diaphragm (3), and a bimetallic strip overheat protector (5); The heating wire (2) is embedded inside the diaphragm (3); The bimetallic strip overheat protector (5) is connected in series in the heating circuit of the heating wire (2); The heating assembly is fitted onto the radar cover plate (1).

2. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 1, characterized in that, The bimetallic strip overheat protector (5) is welded to the heating wire (2) by electrodes.

3. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 2, characterized in that, The diaphragm (3) has at least one pair of openings, the heating wire (2) passes through the openings, and the electrode is welded to the heating wire (2) at the opening.

4. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 2, characterized in that, The electrodes are arranged symmetrically to the bimetallic strip overheat protector (5).

5. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 1, characterized in that, The heating assembly also includes a protector cover (6), which is mounted on the outside of the bimetallic overheat protector (5) and is welded to the diaphragm (3).

6. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 5, characterized in that, The bimetallic strip overheat protector (5) is snapped into the inside of the protector cover plate (6).

7. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 1, characterized in that, The heating assembly also includes a connector (4), which is welded to the diaphragm (3) and connected to one end of the heating wire (2).

8. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 1, characterized in that, The membrane (3) is a PC membrane.

9. A radar heating cover plate employing a bimetallic strip overheat protector according to claim 1, characterized in that, The radar cover (1) is a PC panel.

10. A car, characterized in that, The radar heating cover as described in any one of claims 1-9 is mounted on the vehicle body.

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