PTC (Positive Temperature Coefficient) heater for air heating of new energy automobile

Abstract

The utility model belongs to the technical field of new energy automobiles, and particularly relates to a PTC heater for wind heating of a new energy automobile, which comprises a sealing protective shell, a PTC heating core body is arranged in the sealing protective shell, one end of the PTC heating core body is electrically connected with a wiring harness assembly, and the wiring harness assembly extends to the outer side of the sealing protective shell. Filling glue is arranged between the end, electrically connected with the wire harness assembly, of the PTC heating core body and the sealing protection shell, a ventilation type valve set is installed on the sealing protection shell, and the sealing protection shell comprises a lower frame installed on one side of the PTC heating core body and an upper frame installed on the other side of the PTC heating core body. The end, away from the wire harness assembly, of the combination of the PTC heating core and the upper frame is fixedly connected with a tail base, and the tail base is a ventilation type valve set. According to the utility model, the phenomenon of bonding cracking at the sealing part of the sealing protection shell caused by pressure difference formed during thermal expansion and cold contraction can be reduced, and the protection effect of the sealing protection shell is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicles, and specifically relates to a PTC heater for air heating of new energy vehicles. Background Art

[0002] The scale of China's new energy vehicle industry has shown a blowout expansion. New energy vehicles have many advantages such as energy saving, emission reduction, and environmental protection, and also represent the development direction of the world's automobile industry. The air conditioning heater of new energy vehicles is connected to the high voltage of the whole vehicle, and has high safety requirements. The protection level requirement is usually IP67 or higher.

[0003] At present, the common way to achieve the protection level requirements in the market is to fill the sealant. After the sealant is filled, due to the thermal expansion and contraction of the temperature change when the heater is turned on and off, a tiny gap is easily formed between the silicone and the aluminum material of the heating core, resulting in reduced waterproof performance. When the waterproof performance is reduced, water enters the heating core, resulting in poor insulation. Utility Model Content

[0004] The purpose of the utility model is to provide a PTC heater for wind heating of new energy vehicles, which can reduce the phenomenon of cracking of the sealing joint of the sealing protective shell caused by the pressure difference formed during thermal expansion and contraction, and ensure the protective effect of the sealing protective shell.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A PTC heater for air heating of new energy vehicles comprises a sealed protective shell, a PTC heating core is installed inside the sealed protective shell, one end of the PTC heating core is electrically connected to a wiring harness assembly, the wiring harness assembly extends to the outside of the sealed protective shell, potting glue is arranged between the end of the PTC heating core electrically connected to the wiring harness assembly and the sealed protective shell, and a breathable valve group is installed on the sealed protective shell.

[0007] Furthermore, the sealed protective shell includes a lower frame installed on one side of the PTC heating core and an upper frame installed on the other side of the PTC heating core, and the combination of the PTC heating core and the upper frame is fixedly connected to a tail base at one end away from the wiring harness assembly, and the tail base is a breathable valve group.

[0008] Furthermore, the lower frame and the PTC heating core are both made of PPA+GF30.

[0009] Furthermore, the tail base includes a plastic frame, which is fixedly connected to the end of the combination of the PTC heating core and the upper frame away from the wiring harness assembly, and a chamber is provided inside the plastic frame. The end of the plastic frame close to the PTC heating core is fixedly connected to a silicone pad, and the silicone pad is provided with a plurality of ventilation grooves. The end of the plastic frame away from the PTC heating core is fixedly connected to a cover, and a ventilation valve is installed on the cover.

[0010] Furthermore, a plurality of sealing rubber blocks are installed on one side of the silicone pad close to the cover and located on one side of the ventilation slot.

[0011] Furthermore, a mounting groove is provided on one side of the plastic frame close to the cover and located outside the cavity, and a sealing rubber ring is installed inside the mounting groove.

[0012] Furthermore, the plastic frame and the cover are both made of plastic.

[0013] The technical effects achieved by the utility model are:

[0014] The utility model discloses a PTC heater for air heating of new energy vehicles. During the use of the PTC heater, ventilation is performed through a breathable valve group, which can reduce the pressure difference formed by thermal expansion and contraction of the sealing structure formed by the sealing protective shell and the filling glue, which may cause cracking of the sealing joint, thereby ensuring the protective effect of the sealing protective shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the exploded structure of the tail base of the utility model.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0019] 1. Tail base; 2. Lower frame; 3. PTC heating core; 4. Upper frame; 5. Wiring assembly; 6. Plastic frame; 7. Chamber; 8. Silicone pad; 9. Breathing notch; 10. Cover; 11. Breathing valve; 12. Sealing rubber block; 13. Installation groove; 14. Sealing rubber ring. DETAILED DESCRIPTION

[0020] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.

[0021] like Figure 1-3 As shown, a PTC heater for air heating of new energy vehicles includes a sealed protective shell, a PTC heating core 3 is installed inside the sealed protective shell, one end of the PTC heating core 3 is electrically connected to a wiring harness assembly 5, and the wiring harness assembly 5 extends to the outside of the sealed protective shell. At this time, when the wiring harness assembly 5 is energized, heating can be performed through the PTC heating core 3.

[0022] Filling glue is arranged between one end of the PTC heating core 3 electrically connected to the wiring harness assembly 5 and the sealing protective shell. The filling glue is preferably filled silicone, so that the electrodes converging the PTC heating core 3 are sealed in the glue to reduce water ingress into the heater in bad weather. A breathable valve group is installed on the sealing protective shell to ensure that the product meets the IP67 requirements and is breathable, thereby reducing the pressure difference formed by thermal expansion and contraction of the sealing structure formed by the sealing protective shell and the filling glue, which may cause cracking of the seal.

[0023] Among them, Figure 1-2 As shown, the sealed protective shell includes a lower frame 2 installed on one side of the PTC heating core 3 and an upper frame 4 installed on the other side of the PTC heating core 3. The material of the lower frame 2 and the PTC heating core 3 is PPA+GF30, which has the advantages of high temperature resistance, low price and light weight.

[0024] The lower frame 2 and the PTC heating core 3PTC heating core 3 and the upper frame 4 can be combined into a lower shell, and the combination method can be snap-on or screw-connected. The end of the combination of the PTC heating core 3 and the upper frame 4 away from the wiring harness assembly 5 is fixedly connected with the tail base 1, and the tail base 1 is a breathable valve group. At this time, when the PTC heating core 3 is heated, it will ventilate through the tail base 1, and its structure is relatively simple.

[0025] Among them, Figure 2-3 As shown, the tail base 1 includes a plastic frame 6, which is fixedly connected to the end of the combination of the PTC heating core 3 and the upper frame 4 away from the wiring harness assembly 5, and a chamber 7 is provided inside the plastic frame 6. A silicone pad 8 is fixedly connected to the end of the plastic frame 6 close to the PTC heating core 3, and the silicone pad 8 can reduce the leakage of glue during the injection of sealant. A plurality of venting notches 9 are provided on the silicone pad 8, and a cover 10 is fixedly connected to the end of the plastic frame 6 away from the PTC heating core 3, and the fixing method thereof can be a snap connection. A venting valve 11 is installed on the cover 10, and the venting notch 9, the chamber 7 and the venting valve 11 can form a venting channel;

[0026] The air-permeable valve 11 allows gas to freely enter and exit, but liquid water and fog cannot pass through, thereby achieving the effect of waterproof and breathable, and balancing the pressure difference between the inside and the outside.

[0027] A plurality of sealing rubber blocks 12 are installed on one side of the silicone pad 8 close to the cover 10 and located on one side of the air permeable groove 9 to strengthen the seal between the plastic frame 6 and the PTC heating core 3. A mounting groove 13 is provided on one side of the plastic frame 6 close to the cover 10 and located on the outside of the chamber 7. A sealing rubber ring 14 is installed inside the mounting groove 13. The sealing rubber ring 14 can strengthen the seal between the plastic frame 6 and the cover 10.

[0028] Moreover, the plastic frame 6 and the cover 10 are both made of plastic, which plays the role of insulation and support and is temperature-resistant up to 250°C.

[0029] The working principle of the utility model is: when in use, the PTC heater is installed in the air conditioning box of the new energy vehicle, and the heat generated by the PTC heater is taken away by blowing air;

[0030] In addition, during the use of the PTC heater, ventilation is carried out through the air valve 11, which can reduce the pressure difference formed by thermal expansion and contraction of the sealing structure formed by the sealing protective shell and the filling glue, causing cracking of the sealing joint, thereby ensuring the protective effect of the sealing protective shell. At the same time, the characteristics of the PTC heating sheet are fully considered. The PTC sheet can withstand higher voltage and temperature in an unsealed environment, which is conducive to the reliability development of high-voltage platform products.

[0031] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A PTC heater for wind heating of new energy vehicles, comprising a sealed protective shell, a PTC heating core (3) is installed inside the sealed protective shell, one end of the PTC heating core (3) is electrically connected to a wiring harness component (5), and the wiring harness component (5) extends to the outside of the sealed protective shell, characterized in that: A potting glue is provided between one end of the PTC heating core (3) electrically connected to the wiring harness assembly (5) and the sealing protective shell, and a breathable valve group is installed on the sealing protective shell.

2. A PTC heater for wind heating of new energy vehicles according to claim 1, characterized in that: The sealed protective shell comprises a lower frame (2) mounted on one side of the PTC heating core (3) and an upper frame (4) mounted on the other side of the PTC heating core (3); an end of the assembly of the PTC heating core (3) and the upper frame (4) away from the wiring harness assembly (5) is fixedly connected to a tail base (1); the tail base (1) is a breathable valve assembly.

3. A PTC heater for wind heating of new energy vehicles according to claim 2, characterized in that: The lower frame (2) and the PTC heating core (3) are both made of PPA+GF30.

4. A PTC heater for wind heating of new energy vehicles according to claim 2, characterized in that: The tail base (1) comprises a plastic frame (6), the plastic frame (6) being fixedly connected to an end of a combination of a PTC heating core (3) and an upper frame (4) away from the wiring harness assembly (5), a chamber (7) being provided inside the plastic frame (6), a silicone pad (8) being fixedly connected to an end of the plastic frame (6) close to the PTC heating core (3), a plurality of ventilation slots (9) being provided on the silicone pad (8), and a cover (10) being fixedly connected to an end of the plastic frame (6) away from the PTC heating core (3), a ventilation valve (11) being installed on the cover (10).

5. A PTC heater for wind heating of new energy vehicles according to claim 4, characterized in that: A plurality of sealing rubber blocks (12) are installed on a side of the silicone pad (8) close to the cover (10) and located on a side of the venting slot (9).

6. A PTC heater for wind heating of new energy vehicles according to claim 4, characterized in that: A mounting groove (13) is provided on a side of the plastic frame (6) close to the cover (10) and located outside the chamber (7), and a sealing rubber ring (14) is installed inside the mounting groove (13).

7. A PTC heater for wind heating of new energy vehicles according to claim 4, characterized in that: The plastic frame (6) and the cover (10) are both made of plastic.

Images