Heat preservation waterproof type PTC heater

Abstract

This utility model discloses a PTC heater with heating refrigerant, heat insulation, and waterproofing, comprising a PTC heating core, a coil, and a fixing base. The coil body is disposed within the fixing base. Multiple sets of PTC heating cores are arranged, each set positioned between adjacent coil bodies. An outer shell is provided outside the fixing base, with a front cover bracket and a rear cover bracket at each end of the outer shell. Sealing rings are provided between the front and rear cover brackets and the outer shell. An insulation layer is provided outside the outer shell, and a protective layer is provided outside the insulation layer. Through holes for two connectors of the coil are provided on the front and / or rear cover brackets, and sealant is filled between the through holes and the coil connectors. Outlets for wires are provided on the front or rear cover brackets, with threaded nuts on the outlets. A sealing plug is provided between the nut and the outlet, and the sealing plug has a wire through hole. Compared with existing technologies, this design achieves waterproofing and heat insulation functions.

Description

Technical Field

[0001] This utility model relates to a PTC heater, and more particularly to a PTC heater that heats refrigerant, is heat-insulating, and waterproof. Background Technology

[0002] Currently, liquid cooling technology is commonly used in PTC heaters for new energy vehicles, but it has the following disadvantages:

[0003] 1. Liquid cooling systems are complex to design, increase product weight and cost, occupy a lot of space, and are difficult to install. Furthermore, liquid cooling technology carries the risk of short circuits due to leakage.

[0004] 2. Refrigerant technology can utilize the refrigerant in automotive air conditioning to achieve rapid and efficient cooling. However, under extremely cold conditions, the refrigerant cannot vaporize, and it cannot be directly heated.

[0005] 3. Due to the special nature of the cold medium, the contact material must be corrosion-resistant, have good thermal conductivity, and the cost must be taken into account.

[0006] 4. Products used in automobiles or industrial applications require high safety performance. Some heaters do not involve thermal protection devices and rely solely on the vehicle's safety control system, which poses a significant risk.

[0007] 5. It cannot be waterproofed, which can easily lead to electrical leakage problems.

[0008] Currently, there is no product that can solve this problem. Summary of the Invention

[0009] The purpose of this utility model is to provide a PTC heater that heats refrigerant and is waterproof. The technical problem to be solved is to achieve heating of refrigerant while having waterproof and heat preservation functions.

[0010] To solve the above problems, this utility model adopts the following technical solution: a PTC heater with heating refrigerant, heat preservation, and waterproofing, including a PTC heating core and a coil made of corrosion-resistant and thermally conductive material, and a fixing base. The coil body is disposed in the fixing base. Multiple sets of PTC heating cores are provided, with each set of PTC heating cores disposed between adjacent coil bodies. An outer shell is provided outside the fixing base. A front cover bracket and a rear cover bracket are respectively provided on the two openings of the outer shell. A sealing ring is provided between the front cover bracket, the rear cover bracket and the outer shell to achieve waterproof sealing. An insulation layer is provided outside the outer shell, and a protective layer is provided outside the insulation layer. A through hole for two connectors of the coil is provided on the front cover bracket and / or the rear cover bracket. The through hole and the connector of the coil are filled with sealant. An outlet for wires is provided on the front cover bracket or the rear cover bracket. A threaded nut is provided on the outlet. A sealing plug is provided between the nut and the outlet. A wire through hole is provided on the sealing plug.

[0011] Furthermore, at least one set of PTC heating core wires is connected to a thermostat and / or a fuse.

[0012] Furthermore, a temperature sensor is provided on the mounting base.

[0013] Furthermore, the temperature sensor is a thermistor.

[0014] Furthermore, the mounting base is equipped with a sensor for monitoring temperature.

[0015] Furthermore, the sensor is at least one of a temperature sensor, a thermostat, and a fuse.

[0016] Furthermore, the front cover bracket and / or the rear cover bracket are provided with waterproof and breathable valves, which are in communication with the interior of the outer shell.

[0017] Furthermore, the coil is racetrack shaped, having an arc segment and a straight segment connected to the arc segment.

[0018] Furthermore, the fixing base is provided with a receiving cavity with the same number of turns as the coil, the tube body of the coil is placed in the receiving cavity, a PTC fixing cavity is provided between two adjacent receiving cavities, and the PTC heating core is placed in the PTC fixing cavity.

[0019] Furthermore, the receiving cavity consists of two channels that are adapted to the body of the coil.

[0020] Compared with the prior art, this utility model has a different feature. By setting an outer shell around the fixed base, and setting end cap brackets at both ends of the outer shell and sealing them with sealing rings, the connection between the coil and the end cap bracket is filled with sealant, and an outlet with a sealing cap is provided. This ensures that the PTC heater has no openings except for necessary holes, thus achieving waterproofing. Furthermore, an insulation layer is set outside the outer shell, and a protective layer is set outside the insulation layer, giving the product a heat preservation function. This prevents heat from easily dissipating outside the PTC heater and ensures the heating effect of the PTC heater. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the external structure of this utility model. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the external structure of this utility model. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0024] Figure 4 This is an exploded view of the present invention.

[0025] Figure 5 This is a schematic diagram showing the connection between the coil and the fixed base of this utility model. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 4 As shown, this embodiment 1 discloses a PTC heater with heating refrigerant, heat insulation, and waterproofing, comprising the following main components: PTC heating core 1, coil 2, and fixing base 3, wherein:

[0028] The coil 2 is wound at least two turns and is shaped like a racetrack, with an arc segment and a straight segment connected to the arc segment; the coil 2 is made of a corrosion-resistant and thermally conductive material, preferably copper; the coil 2 has two joints located on the same side, and the use of the coil 2 enables the refrigerant to pass through an integrated multi-stage bent copper tube, resulting in a large heating area and high heating efficiency.

[0029] The mounting base 3 includes a receiving cavity 19 with the same number of turns as the coil 2. The tube body of the coil 2 is disposed in the receiving cavity 19. A PTC fixing cavity 20 is provided between two adjacent receiving cavities 19. The PTC heating core 1 is disposed in the PTC fixing cavity 20, so that the two heating surfaces of the PTC heating core 1 can simultaneously heat the adjacent tube body.

[0030] A housing 14 is provided outside the fixed base 3, which surrounds the fixed base 3. The housing 14 has openings at both ends for connectors and wires to be led out. A front cover bracket 4 and a rear cover bracket 5 are respectively provided on the openings to close the openings. The front cover bracket 4 and the rear cover bracket 5 are provided with connecting seats with screw holes. Correspondingly, the housing 14 is provided with matching screw holes. The front cover bracket 4 and the rear cover bracket 5 are threadedly connected and fixed to the screw holes by screws passing through the screw holes on the connecting seats.

[0031] A sealing ring 3 is provided between the front cover bracket 4, the rear cover bracket 5 and the outer shell 14 to achieve waterproof sealing. A groove 22 is provided at the end of the front cover bracket 4 and the rear cover bracket 5 facing the outer shell 14, and the sealing ring 3 is set in the groove 22.

[0032] An insulation layer 15 is wrapped around the outer shell 14. The insulation layer 15 is used to prevent heat from dissipating too quickly and to allow heat to be concentrated, thereby further improving the heating effect. Specifically, the insulation layer 15 is made of aluminum silicate insulation cotton.

[0033] A protective layer 16 is also wrapped around the insulation layer 15 to prevent the insulation layer 15 from being damaged. The fireproof layer 16 is made of heat shrink tubing.

[0034] The front cover bracket 4 has through holes 17 for the two connectors of the coil 2 to be led out. The space between the through holes 17 and the connectors of the coil 2 is filled with sealant 8. The rear cover bracket 5 has an outlet 18 for the lead wires to be led out. The outlet 18 has a threaded nut 7. A sealing plug 6 is provided between the nut 7 and the outlet 18. The sealing plug 6 has a lead wire through hole for the lead wires of the PTC heating core 1 to be led out. The use of the outlet 18 and the sealing plug 6 can achieve a good sealing effect, thereby achieving the IP67 protection level. The sealing plug 6 is made of silicone material.

[0035] In this invention, the through hole 17 can be a countersunk hole to facilitate the filling of sealant 8.

[0036] like Figure 3As shown, this utility model also includes a thermostat 12 and a fuse 13. The thermostat 12 and the fuse 13 are connected in series with at least one set of PTC heating core 1 wires. Of course, the thermostat 12 can be built into the housing 14 or placed outside the housing 14. When placed outside the housing 14, it is connected in series with the PTC heating core 1 through the lead wire through the lead hole of the sealing plug 6. Multiple sets of PTC heating core 1 can share one thermostat 12 or one fuse 13. When the heater overheats in an abnormal situation, the thermostat will disconnect the heating core power supply or provide a disconnect signal to the external control system to disconnect the heating core power supply to achieve thermal protection. When the heater overheats in an abnormal situation, the fuse will disconnect the heating core power supply or provide a disconnect signal to the external control system to disconnect the heating core power supply to further achieve thermal protection and improve the thermal protection effect.

[0037] like Figure 3 As shown, a temperature sensor 11 is further provided on the mounting base 3. The wire of the temperature sensor 11 is directly led out through the sealing plug 6. When the heater overheats in an abnormal situation, it will provide a temperature signal to the external control system to disconnect the power supply of the heating core, so as to further realize thermal protection. The temperature sensor 11 is preferably a thermistor.

[0038] However, this utility model is not limited to this. A sensor for monitoring temperature can also be set on the fixed base 3. The sensor can be a temperature sensor, preferably a thermistor 11. Of course, the fuse 13 and the temperature controller 12 can also be used as sensors to realize temperature monitoring of the PTC heating core 1.

[0039] This utility model features three levels of thermal protection: the first level is a temperature controller, the second level is a fuse, and the third level is a thermistor (NTC) installed inside the product. This gives the entire PTC heater an independent thermal protection device. Furthermore, when connected to the overall safety system, it will promptly alert the user in case of abnormalities in the transfer of cold coal or accidents involving other parts of the equipment, greatly enhancing safety performance.

[0040] like Figure 1 , Figure 3 and Figure 4 As shown, a waterproof and breathable valve 9 is provided on the front cover bracket 4 and / or the rear cover bracket 5. The waterproof and breathable valve 9 is connected to the interior of the outer shell 14. The waterproof and breathable valve 9 allows air to pass through but does not allow water to pass through. It can balance the pressure inside and outside the outer shell while ensuring waterproof performance, and avoid the outer shell from failing due to pressure difference.

[0041] like Figure 3 , Figure 4 and Figure 5As shown, the coil 2 is racetrack-shaped, with an arc segment and a straight segment connected to the arc segment. The straight segment is located in the receiving cavity 19. Optionally, the receiving cavity 19 consists of two channels 21 that are adapted to the straight segment of the coil 2. In addition to copper tubes, other materials such as aluminum can also be considered for the coil 2, provided that corrosion resistance and good thermal conductivity are guaranteed.

[0042] In this utility model, the outer shell 14, the front cover bracket 4, and the rear cover bracket 5 are all made of aluminum.

[0043] This invention is applicable to PTC heaters that use refrigerant heating and have thermal protection and IP67 protection rating. It can meet the performance requirements of the product while making the product smaller, easier to install, and equipped with multi-level thermal protection devices, thereby improving the safety level of the product.

Claims

1. A PTC heater with heating refrigerant, heat insulation, and waterproof properties, comprising a PTC heating core (1) and a coil (2) made of a corrosion-resistant and thermally conductive material, characterized in that: It also includes a fixing seat (3), the tube body of the coil (2) is located in the fixing seat (3), the PTC heating core (1) is provided in multiple sets, each set of PTC heating core (1) is located between adjacent tube bodies of the coil (2), an outer shell (14) is provided outside the fixing seat (3), a front end cover bracket (4) and a rear end cover bracket (5) are respectively provided on the two ends of the outer shell (14), a sealing ring (3) is provided between the front end cover bracket (4), the rear end cover bracket (5) and the outer shell (14) to achieve waterproof sealing, and a heat insulation layer (15) is provided outside the outer shell (14). The insulation layer (15) is provided with a protective layer (16). The front cover bracket (4) and / or the rear cover bracket (5) are provided with through holes (17) for the two connectors of the coil (2) to be led out. The through holes (17) and the connectors of the coil (2) are filled with sealant (8). The front cover bracket (4) or the rear cover bracket (5) is provided with an outlet (18) for the wire to be led out. The outlet (18) is provided with a threaded nut (7). A sealing plug (6) is provided between the nut (7) and the outlet (18). The sealing plug (6) is provided with a wire through hole.

2. The heating refrigerant heat preservation waterproof type PTC heater according to claim 1, characterized in that: At least one set of PTC heating cores (1) has a thermostat (12) and / or a fuse (13) connected to its wires.

3. The heating refrigerant heat preservation waterproof type PTC heater according to claim 2, characterized in that: A temperature sensor (11) is provided on the mounting base (3).

4. The PTC heater with heating refrigerant insulation and waterproofing according to claim 3, characterized in that: The temperature sensor (11) is a thermistor.

5. The PTC heater with heating refrigerant insulation and waterproofing according to claim 1, characterized in that: The mounting base (3) is equipped with a sensor for monitoring temperature.

6. The PTC heater with heating refrigerant insulation and waterproofing according to claim 5, characterized in that: The sensor is at least one of a temperature sensor (11), a thermostat (12), and a fuse (13).

7. The PTC heater with heating refrigerant insulation and waterproofing according to claim 1, characterized in that: The front cover bracket (4) and / or the rear cover bracket (5) are provided with waterproof and breathable valves (9), which are connected to the interior of the outer shell (14).

8. The heating refrigerant thermal insulation waterproof type PTC heater according to claim 1, characterized in that: The coil (2) is in the shape of a racetrack, with an arc segment and a straight segment connected to the arc segment.

9. The heating refrigerant heat preservation waterproof type PTC heater according to claim 8, characterized in that: The fixed base (3) is provided with a receiving cavity (19) with the same number of turns as the coil (2). The tube body of the coil (2) is placed in the receiving cavity (19). A PTC fixed cavity (20) is provided between two adjacent receiving cavities (19). The PTC heating core (1) is placed in the PTC fixed cavity (20).

10. The heating refrigerant heat preservation waterproof type PTC heater according to claim 9, characterized in that: The receiving cavity (19) consists of two channels (21) that are adapted to the tube body of the coil (2).

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