PTC waterproof heater

Abstract

The invention discloses a PTC waterproof heater which is characterized in that the A end of a heating body mechanism is arranged in a sealed manner, the A end of the heating body mechanism is arranged in a left base and is connected with the left base in a sealed manner, the B end of a heating core is arranged in a right base and is connected with the right base in a sealed manner, the right base is filled with sealing rubber, the right base is provided with a waterproof gland, and the waterproof gland is connected with the right base in a sealed manner; the right base comprises a shell and a cover plate, a buffer film layer is arranged on the cover plate, the cover plate is arranged on the shell and fixedly connected with the shell, and the joint of the cover plate and the shell is coated with sealing rubber. Sealing rubber is arranged at the connecting positions of the heating body mechanism, the left base and the right base so that the overall sealing performance can be improved, a buffering film layer is arranged in the right base so that a buffering space can be formed in the right base, the pressure of thermal expansion and cold contraction of the sealing rubber can be relieved, the sealing performance of the heater can be improved, and the service time can be prolonged.

Description

Technical Field

[0001] The invention relates to an electric vehicle PTC electric heater of an automobile air-conditioning system, and in particular to a PTC waterproof heater. Background Art

[0002] The PTC waterproof heater is a waterproof heater that uses a PTC (positive temperature coefficient) ceramic heating element. This type of PTC heating element has the advantages of low thermal resistance and high heat exchange efficiency. It is an automatic constant temperature and power-saving electric heater. It has become the mainstream of new energy vehicle heaters. There are many problems with existing PTC heaters, among which water leakage is a relatively common problem. The existing heaters prevent water leakage at various connection positions by filling with sealing rubber, but the rubber filled in the base of the heater usually destroys the structure of the connection due to the influence of thermal expansion and contraction, that is, it will crack the base and cause water leakage at the connection. Summary of the invention

[0003] Purpose of the invention: The present invention provides a PTC waterproof heater, which has good waterproof performance and the base will not crack during use, thereby improving waterproof stability.

[0004] Technical solution: A PTC waterproof heater, comprising a wire, a left base, a heating body mechanism, a right base, a waterproof gland, and a sealing rubber. The A end of the heating body mechanism is sealed, and the A end of the heating body mechanism is arranged in the left base and sealedly connected to it. The B end of the heating core is arranged in the right base and sealedly connected to it. The right base is filled with the sealing rubber. The waterproof gland is provided on the right base, and the waterproof gland and the right base are sealed. The wire passes through the waterproof gland and is connected to the heating body mechanism. The right base comprises a shell and a cover plate. A buffer film layer is provided on the cover plate. The cover plate is arranged on the shell and fixedly connected to it. The connection between the cover plate and the shell is coated with sealing rubber.

[0005] Furthermore, the heating body mechanism includes an aluminum heat dissipation strip, a ceramic tube, and a heating core. The heating core is arranged in the ceramic tube, and the heating core is connected to the wire. A plurality of aluminum heat dissipation strips are arranged in parallel, and the ceramic tube is arranged between adjacent aluminum heat dissipation strips. The sealing rubber is coated on the A end of the ceramic tube. The A end of the ceramic tube is arranged in the left base and sealedly connected to it, and the B end of the ceramic tube is arranged in the right base and sealedly connected to it.

[0006] Furthermore, the ceramic tube is square, and the aluminum heat dissipation strip is square. The square ceramic tube and the square aluminum heat dissipation strip increase the contact area and improve the heat conduction efficiency.

[0007] Furthermore, four heat dissipation strips are provided.

[0008] Furthermore, the surface of the A end of the heating body mechanism is a rough surface, and the sealing rubber is coated on the A end of the heating body mechanism, the connection between the A end of the heating body mechanism and the left base, the connection between the B end of the heating core and the right base, and between the waterproof gland and the right base.

[0009] Furthermore, the sealing rubber is coated with a waterproof nano coating, which can prevent water droplets from condensing on the rubber and improve the waterproof performance.

[0010] Furthermore, the sealing rubber is silicone rubber or resin glue.

[0011] Beneficial effect: The advantage of the present invention is that a waterproof gland is provided to seal the connection between the heater and the wire, and sealing rubber is provided at the connection between the heating body mechanism and the left base and the right base to improve the overall sealing performance. A buffer film layer is provided in the right base to form a buffer space in the right base, which reduces the pressure of thermal expansion and contraction of the sealing rubber, improves the sealing performance of the heater and increases the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view schematic diagram of the heater;

[0013] Figure 2 for Figure 1 Middle CC section view;

[0014] Figure 3 This is an overall schematic diagram of the right base. DETAILED DESCRIPTION

[0015] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0016] A PTC waterproof heater, such as Figure 1 As Figure 2As shown, it includes a wire 1, a left base 2, a heating body mechanism 3, a right base 4, a waterproof gland 5, and a sealing rubber 6. The heating body mechanism 3 is a core component for heating. It is a heating component based on the positive temperature coefficient (PTC) characteristic, has the characteristic that the resistance value increases sharply with the increase of temperature, and the heating is stable. The heating body mechanism 3A end is sealed, specifically, the heating body mechanism 3A end is coated with sealant, the heating body mechanism 3A end is the end of the heating body mechanism 3, the heating body mechanism 3A end is arranged in the left base 2 and sealedly connected thereto, which can be understood as the heating body mechanism 3A end is arranged in the left base 2 and sealed at the connection to prevent water vapor from entering, specifically, the connection between the heating core B end and the right base 4 is coated with a sealing rubber 6, the heating core B end is arranged in the right base 4 and sealedly connected thereto, which can be understood as the heating body mechanism 3B end is placed in the right base 4, and is sealed at the connection to prevent water vapor from entering Specifically, the connection between the B end of the heating core and the right base 4 is coated with sealant, and the right base 4 is filled with sealing rubber 6. Because there is a connecting wire 1 in the right base 4, it needs to be sealed, which is equivalent to the difficulty in sealing the left base 2 and the A end of the heating body mechanism 3. Therefore, the right base 4 is filled with sealing rubber 6 for waterproofing. A waterproof gland 5 is provided on the right base 4. The waterproof gland 5 and the right base 4 are sealed and connected. Specifically, sealant is coated between the waterproof gland 5 and the right base 4. The wire 1 passes through the waterproof gland 5 and is connected to the heating body mechanism 3. Because there is a gap when the wire 1 enters from the right base 4 and is connected to the heating body mechanism 3, the connection is waterproofed after using the waterproof gland 5. The waterproof gland 5 has good weather resistance and chemical resistance, and can maintain the waterproof function for a long time in various harsh environments. The wire 1 is energized to make the heating body mechanism 3 heat up, thereby heating the place that needs to be heated. The sealing rubber 6 is silicone or resin glue.

[0017] A waterproof nano coating is applied to the sealing rubber 6 to further improve the waterproof performance. The waterproof nano coating can form a super-hydrophobic protective layer on the surface of the material, so that water droplets present a higher contact angle thereon, thereby achieving rapid rolling off. Its characteristics can be used to further improve the waterproof performance.

[0018] The heating body mechanism 3 includes an aluminum heat dissipation strip 31, a ceramic tube 32, and a heating core 33. The heating core 33 is a heating component of the heater. The heating core 33 is arranged in the ceramic tube 32. It can be understood that the heating core 33 is arranged in the ceramic tube 32. The heating core 33 is connected to the wire 1. Specifically, the heating core 33 is connected to the wire 1 in the ceramic tube 32B. A plurality of aluminum heat dissipation strips 31 are arranged in parallel. It can be understood that the aluminum heat dissipation strips 31 are arranged in parallel between the left base 2 and the right base 4. The plurality of aluminum heat dissipation strips are selected and arranged according to the heating power of the heater. Four heat dissipation strips are arranged to meet the use requirements. A ceramic heat dissipation strip 31 is arranged between adjacent aluminum heat dissipation strips 31. The ceramic tube 32 can be understood as the aluminum heat dissipation strip 31 and the ceramic tube 32 arranged alternately with each other, the outermost is the aluminum heat dissipation strip 31, the number of aluminum heat dissipation strips 31 is one more than the article tube, the ceramic tube 32A end is coated with a sealing rubber 6, the sealing rubber 6 seals the ceramic tube 32A end to prevent water from entering, the surface of the heating body mechanism 3A end is a rough surface, which can increase the adhesion of the sealant to make the sealant more firmly bonded, the ceramic tube 32A end is arranged in the left base 2 and sealedly connected thereto, specifically, the ceramic tube 32A end and the left base 2 are coated with a sealant, and the ceramic tube 32B end is arranged in the right base 4 and sealedly connected thereto. The ceramic tube 32 is square, and the aluminum heat dissipation strip 31 is square. The square ceramic tube 32 and the aluminum heat dissipation strip 31 have a large contact area, which improves the heat conduction effect and the heating efficiency.

[0019] The right base 4 includes a shell 41 and a cover plate 42. Figure 3 As shown, a buffer film layer 43 is provided on the cover plate 42, which can be understood as a relatively thin sheet layer, which has a certain buffering effect when squeezed, and the cover plate 42 is arranged on the shell 41 and fixedly connected thereto, and it can be understood that after the cover plate 42 and the shell 41 are connected, the buffer film layer 43 is located between the cover plate 42 and the shell 41. The specific method of use is to first place the heating core 33 in the shell 41, and then inject the sealing rubber 6 into the shell 41 until it is flush with the shell 41, and then cover the cover plate 42. At this time, it is equivalent to providing an expansion or contraction space for the sealing rubber 6 in the right base 4 to prevent the heater from thermal expansion and contraction during use. When thermally expanded, the sealing rubber 6 in the right base 4 will push the cover plate 42 open to destroy the waterproof effect, and the joint between the cover plate 42 and the shell 41 is coated with sealing rubber 6, which improves the service life of the heater.

[0020] The present invention seals the connection between the heater and the wire by arranging a waterproof gland, and arranges sealing rubber at the connection between the heating body mechanism and the left base and the right base to improve the overall sealing performance. A buffer film layer is arranged in the right base to form a buffer space in the right base, which effectively prevents the thermal expansion and contraction of the sealing rubber, improves the sealing performance of the heater and increases the service life.

Claims

1. A PTC waterproof heater, characterized in that: The invention comprises a wire (1), a left base (2), a heating body mechanism (3), a right base (4), a waterproof gland (5), and a sealing rubber (6); the A end of the heating body mechanism (3) is sealed, the A end of the heating body mechanism (3) is arranged in the left base (2) and is sealedly connected thereto; the B end of the heating core is arranged in the right base (4) and is sealedly connected thereto; the sealing rubber (6) is filled in the right base (4); the waterproof gland (5) is arranged on the right base (4); the waterproof gland (5) and the right base (4) are sealedly connected; the wire (1) passes through the waterproof gland (5) and is connected to the heating body mechanism (3); the right base (4) comprises a shell (41) and a cover plate (42); a buffer film layer (43) is arranged on the cover plate (42); the cover plate (42) is arranged on the shell (41) and is fixedly connected thereto; the connection between the cover plate (42) and the shell (41) is coated with a sealing rubber (6).

2. A PTC waterproof heater according to claim 1, characterized in that: The heating body mechanism (3) comprises an aluminum heat dissipation strip (31), a ceramic tube (32), and a heating core (33); the heating core (33) is arranged in the ceramic tube (32); the heating core (33) is connected to the wire (1); a plurality of aluminum heat dissipation strips (31) are arranged in parallel; the ceramic tube (32) is arranged between adjacent aluminum heat dissipation strips (31); the A end of the ceramic tube (32) is coated with the sealing rubber (6); the A end of the ceramic tube (32) is arranged in the left base (2) and is sealed thereto; the B end of the ceramic tube (32) is arranged in the right base (4) and is sealed thereto.

3. A PTC waterproof heater according to claim 2, characterized in that: The ceramic tube (32) is square, and the aluminum heat dissipation strip (31) is square.

4. A PTC waterproof heater according to claim 2, characterized in that: There are four heat dissipation strips.

5. A PTC waterproof heater according to claim 1, characterized in that: The surface of the A end of the heating body mechanism (3) is a rough surface, and the sealing rubber (6) is coated on the A end of the heating body mechanism (3), the connection between the A end of the heating body mechanism (3) and the left base (2), the connection between the B end of the heating core and the right base (4), and between the waterproof gland (5) and the right base (4).

6. A PTC waterproof heater according to claim 5, characterized in that: The sealing rubber (6) is coated with a waterproof nano coating.

7. A PTC waterproof heater according to claim 1, characterized in that: The sealing rubber (6) is silicone rubber or resin glue.

Images