A cylindrical PTC heating element and a heater using the same

Abstract

The present application discloses a columnar PTC heating element, comprising a columnar PTC heating core for generating heat, a first inlet and a first outlet are provided on the columnar PTC heating core, a heating channel is formed between the first inlet and the first outlet, a heat sink is provided on the columnar PTC heating core, a plurality of first heat sink fins are provided on the heat sink, each first heat sink fin extends in the longitudinal direction of the columnar PTC heating core, and a first ventilation gap is left between two adjacent first heat sink fins. The present application has a reasonable structure and has the effect of reducing the wind resistance when wind flows through the PTC heating element.

Description

Technical Field

[0001] The invention relates to the technical field of PTC heating, and in particular to a columnar PTC heating element and a heater using the same. Background Art

[0002] Bathroom heaters are the preferred heating equipment for many families when bathing (also known as multifunctional heaters in the industry). Bathroom heaters sold on the market can be divided into the following four types according to their heating principles: light bulb series bathroom heaters, PTC (a ceramic electric heating element) series bathroom heaters, dual warm current series bathroom heaters and far infrared heat wave bathroom heaters. Among them, the PTC series bathroom heaters use PTC ceramic heating elements as heat sources, and have the advantages of fast heating, high thermal efficiency, no light, no open flames, and long service life, and are highly favored by the market.

[0003] The PTC heating unit used in the existing PTC series bathroom heaters has a horizontal structure and a high density. During the wind transmission process, when the wind passes through the PTC heating unit, the wind resistance is large, the wind force is severely attenuated, and the wind speed at the air outlet is weakened. Summary of the invention

[0004] In order to reduce the wind resistance when wind flows through a PTC heating element, the present application provides a cylindrical PTC heating element and a heater using the element.

[0005] In the first aspect, the present application provides a cylindrical PTC heating element adopting the following technical solution:

[0006] A columnar PTC heating element comprises a columnar PTC heating core for generating heat, wherein a first inlet and a first outlet are provided on the columnar PTC heating core, a heating channel is formed between the first inlet and the first outlet, a heat sink is provided on the columnar PTC heating core, a plurality of first heat sink fins are provided on the heat sink, each of the first heat sink fins extends in the longitudinal direction of the columnar PTC heating core, and a first ventilation gap is left between two adjacent first heat sink fins.

[0007] By adopting the above technical solution, when wind flows through the cylindrical PTC heating core, a part of the wind enters the heating channel through the first inlet for heating, and is output from the first outlet after heating is completed, and the other part of the wind flows from one end of the cylindrical PTC heating core to the other end through the first ventilation gap. The first heat dissipation fin is arranged on the heat dissipation plate to extend along the longitudinal direction of the cylindrical PTC heating core, thereby reducing the wind resistance when the wind flows through the cylindrical PTC heating element, thereby reducing the attenuation of wind force.

[0008] Optionally, a plurality of second heat dissipating fins are arranged in the heating channel, each of the second heat dissipating fins is fixedly arranged in the heating channel, each of the second heat dissipating fins extends along the longitudinal direction of the columnar PTC heating core, and a second ventilation gap is left between two adjacent second heat dissipating fins.

[0009] By adopting the above technical solution, a second heat dissipation fin is arranged in the heating channel, the exposed area is increased, the contact area with the wind flowing through the heating channel is increased, and the heat dissipation effect is improved.

[0010] Optionally, the cross-section, longitudinal section and horizontal section of the first heat dissipation fin and the second heat dissipation fin are all rectangular.

[0011] By adopting the above technical solution, the cross-section, longitudinal section and horizontal section of the first heat dissipation fin and the second heat dissipation fin are all set to be rectangular, and the heat dissipation effect is improved by increasing the exposed area within a limited space.

[0012] Optionally, the cross-section and the longitudinal section of the first heat dissipation fin are both rectangular, and the horizontal section of the first heat dissipation fin is teardrop-shaped.

[0013] By adopting the above technical solution, the horizontal cross-section of the first heat dissipation fin is in the shape of a water droplet, thereby reducing the air resistance generated when the wind flows through the first heat dissipation fin.

[0014] Optionally, each of the first heat dissipation fin side walls is provided with a Venturi channel design opening.

[0015] By adopting the above technical solution, a Venturi duct design opening is opened to allow the wind passing through the ventilation gap to disperse the vacuum area at the air outlet end of the cylindrical PTC heating core, thereby further reducing air resistance.

[0016] Optionally, the longitudinal section of the heating channel is in the shape of a reverse Tesla valve.

[0017] By adopting the above technical solution, wind enters the heating channel from the first inlet and is discharged from the heating channel from the first outlet. The longitudinal section of the heating channel is in the shape of a reverse Tesla valve. The wind encounters greater resistance when flowing in the heating channel. The wind flows slowly in the heating channel, which prolongs the time the wind stays in the heating channel, and is fully heated by the cylindrical PTC heating core.

[0018] Optionally, a mounting groove is provided on the outer wall of the cylindrical PTC heating core, a reinforcing plate is provided in the mounting groove, and the reinforcing plate is provided between the heat dissipation plate and the cylindrical PTC heating core.

[0019] By adopting the above technical solution, a reinforcing plate is arranged between the heat dissipation plate and the columnar PTC to enhance the overall structural strength of the heating element.

[0020] On the other hand, the present application provides a heater using the above-mentioned cylindrical PTC heating element, which adopts the following technical solution:

[0021] A heater comprises a shell, a heat-insulating air duct is provided in the shell, an air inlet is provided on the shell, an annular grille is provided at the air inlet, an air duct isolation plate is provided in the heat-insulating air duct, the air duct isolation plate separates the air outlet of the heat-insulating air duct into a cold air outlet and a hot air outlet, a blowing assembly is provided in the shell, the blowing assembly is provided at the air inlet end of a cylindrical PTC heating element, the blowing assembly comprises a vortex impeller and a high-speed motor driving the vortex impeller, a motor fixing frame is provided in the shell, the high-speed motor is mounted on the motor fixing frame, and a switching assembly for switching between cold air and hot air is also provided on the heat-insulating air duct.

[0022] By adopting the above technical solution, wind enters the heat-insulating air duct from the air inlet, and the wind entering the heat-insulating air duct first passes through the columnar PTC heating element, and then the output wind is switched by the switching component according to the user's needs.

[0023] Optionally, the switching assembly includes a switching damper and a rotating shaft rotatably arranged in the shell, a stepper motor for driving the rotating shaft to rotate is arranged in the shell, the switching damper is fixedly connected to the side wall of the rotating shaft, when the heater is in a state of outputting cold air, the switching damper is in a position to cut off the connection between the air inlet and the hot air outlet, and a cold air channel is formed between the air inlet and the cold air outlet, when the heater is in a state of outputting hot air, the switching damper is in a position to cut off the connection between the air inlet and the cold air outlet, and a hot air channel is formed between the air inlet and the hot air outlet.

[0024] By adopting the above technical solution, when it is necessary to output cold air, the stepper motor drives the shaft to rotate, so that the switching damper is in a position to cut off the connection between the air inlet and the hot air outlet. When it is necessary to output hot air, the stepper motor drives the shaft to rotate, so that the switching damper is in a position to cut off the connection between the air inlet and the cold air outlet.

[0025] Optionally, an air duct is provided at the air inlet.

[0026] By adopting the above technical solution, an air duct is arranged at the air inlet, and rear return air is used to suppress noise in the noise transmission path, thereby reducing noise.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. When the wind flows through the cylindrical PTC heating core, a part of the wind enters the heating channel through the first inlet for heating, and is output from the first outlet after heating is completed, and the other part of the wind flows from one end to the other end of the cylindrical PTC heating core through the first ventilation gap. The first heat dissipation fin is arranged on the heat dissipation plate to extend along the longitudinal direction of the cylindrical PTC heating core, so as to reduce the wind resistance when the wind flows through the cylindrical PTC heating element, thereby reducing the attenuation of the wind force;

[0029] 2. The wind enters the heating channel from the first inlet and is discharged from the heating channel from the first outlet. The longitudinal section of the heating channel is in the shape of a reverse Tesla valve. The wind will encounter greater resistance when flowing in the heating channel. The wind flow rate in the heating channel is slow, which prolongs the time the wind stays in the heating channel and is fully heated by the cylindrical PTC heating core. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0031] Figure 2 It is a partial structural schematic diagram of the first embodiment of the present application, which is used to reflect the cylindrical PTC heating element;

[0032] Figure 3 It is a partial structural diagram of the second embodiment of the present application, which is used to illustrate the cylindrical PTC heating element.

[0033] Description of reference numerals:

[0034] 1. Columnar PTC heating core; 2. First inlet; 3. First outlet; 4. Heating channel; 5. Heat sink; 6. First heat sink fin; 7. First ventilation gap; 8. Second heat sink fin; 9. Mounting slot; 10. Reinforcement plate; 11. Venturi duct design opening; 12. Air inlet; 13. Annular grille; 14. Air duct isolation plate; 15. Cold air outlet; 16. Hot air outlet; 17. Insulated air duct; 18. Blowing assembly; 19. Vortex impeller; 20. High-speed motor; 21. Motor fixing bracket; 22. Switching assembly; 23. Switching damper; 24. Stepping motor; 25. Rotating shaft; 26. Air duct; 27. Second ventilation gap; 28. Terminal; 29. ​​Shell; 30. PTC outer frame. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-3 This application is described in further detail.

[0036] On the one hand, the first embodiment of the present application discloses a cylindrical PTC heating element. Figure 2As shown, a cylindrical PTC heating element includes a cylindrical PTC heating core 1 for generating heat, a first inlet 2 and a first outlet 3 are provided on the cylindrical PTC heating core 1, a heating channel 4 is formed between the first inlet 2 and the first outlet 3, a plurality of second heat dissipation fins 8 are arranged in the heating channel 4, a second ventilation gap 27 is left between two adjacent second heat dissipation fins 8, a heat dissipation plate 5 is provided on the cylindrical PTC heating core 1, a plurality of first heat dissipation fins 6 are provided on the heat dissipation plate 5, a first ventilation gap 7 is left between two adjacent first heat dissipation fins 6, and the cylindrical PTC The outer wall of the C heating core 1 is provided with a mounting groove 9, and a reinforcing plate 10 is arranged in the mounting groove 9. The reinforcing plate 10 is arranged between the heat dissipation plate 5 and the columnar PTC heating core 1. The cross-section, longitudinal section and horizontal section of the first heat dissipation fin 6 and the second heat dissipation fin 8 are all rectangular. When the wind flows from one end to the other end of the columnar PTC heating element, part of the wind flows through the first ventilation gap 7, and the other part of the wind flows through the second ventilation gap 27. The first heat dissipation fin 6 and the second heat dissipation fin 8 are both extended longitudinally along the columnar PTC heating core 1 and coincide with the flow direction of the wind, so as to reduce the wind flowing through The wind resistance of the columnar PTC heating element reduces the wind force attenuation when the wind is output, so that the wind still has a large wind speed when it is output. When the columnar PTC heating core 1 is working and generating heat, the first heat dissipation fins 6 and the second heat dissipation fins 8 are provided to increase the exposed area, thereby increasing the heat transfer contact area between the columnar PTC heating element and the wind flowing through, thereby improving the heat transfer effect between the columnar PTC heating element and the wind, and further improving the heat dissipation effect of the columnar PTC heating element. The first heat dissipation fins 6 are evenly and equidistantly arranged on the heat dissipation plate 5, and the second heat dissipation fins 8 are arranged on the heating channel 4. They are evenly and equidistantly arranged on the inner wall to ensure that the first ventilation gap 7 and the second ventilation gap 27 will not affect the heating effect of the wind due to excessive spacing, nor will they affect the flow rate of the wind when flowing through the columnar PTC heating element due to excessive spacing. One end of the columnar PTC heating element is provided with a terminal 28 for connecting to an external power supply, and an installation groove 9 is opened on the outer wall of the columnar PTC heating core 1. A reinforcing plate 10 is arranged in the installation groove 9. At this time, the reinforcing plate 10 is arranged between the heat dissipation plate 5 and the columnar PTC heating core 1 to enhance the overall structural strength of the heating element.

[0037] On the other hand, the first embodiment of the present application discloses a heater, such as Figure 1As shown, it includes a shell 29, a heat-insulating air duct 17 is provided in the shell 29, an air inlet 12 is provided on the shell 29, and an annular grille 13 is provided at the air inlet 12 to prevent debris from entering the heat-insulating air duct 17 with the wind, a PTC outer frame 30 is provided in the heat-insulating air duct 17, a columnar PTC heating element is installed on the PTC outer frame 30, a duct isolation plate 14 is provided in the heat-insulating air duct 17, and the duct isolation plate 14 separates the air outlet of the heat-insulating air duct 17 into a cold air outlet 15 and a hot air outlet 16, a blowing assembly 18 is provided in the shell 29, and the blowing assembly 18 is arranged at the air inlet end of the columnar PTC heating element, and the blowing assembly 18 includes a vortex impeller 19 and a high-speed motor 20 for driving the vortex impeller 19, a motor fixing frame 21 for installing the high-speed motor 20 is provided in the shell 29, and the high-speed motor 20 is mounted on the motor fixing frame 21, and the heat-insulating air duct 17 is provided. A switching assembly 22 for switching between cold and hot air is also provided on the heater. The switching assembly 22 includes a switching damper 23 and a rotating shaft 25 rotatably arranged in a shell 29. A stepping motor 24 for driving the rotating shaft 25 to rotate is arranged in the shell 29. The switching damper 23 is fixedly connected to the side wall of the rotating shaft 25. When the heater is in a state of outputting cold air, the switching damper 23 is in a position to cut off the connection between the air inlet 12 and the hot air outlet 16, and a cold air channel is formed between the air inlet 12 and the cold air outlet 15. When the heater is in a state of outputting hot air, the switching damper 23 is in a position to cut off the connection between the air inlet 12 and the cold air outlet 15, and a hot air channel is formed between the air inlet 12 and the hot air outlet 16. The vortex impeller 19, the high-speed motor 20 and the cylindrical PTC heating element are arranged in sequence along the longitudinal direction of the shell 29 from one end of the air inlet 12. An air duct 26 is arranged at the air inlet 12 to reduce the air intake noise.

[0038] The implementation principle of a cylindrical PTC heating element and a heater using the same in the first embodiment of the present application is as follows: start the high-speed motor 20, the high-speed motor 20 drives the vortex impeller 19 to rotate to take in air, the wind passes through the annular grille 13 and enters the shell 29 from the air inlet 12, and then according to the user's requirements, the stepper motor 24 is started to drive the rotating shaft 25 to rotate, and the rotating shaft 25 rotates to drive the switching damper 23 to open and close the cold air channel and the hot air channel. If the hot air channel is opened, the cylindrical PTC heating element is connected to the external power supply through the terminal 28 to generate heat, and the cylindrical PTC heating element can also be installed in the hot air channel.

[0039] Embodiment 2 of the present application discloses a cylindrical PTC heating element and a heater using the same. Figure 3As shown, the general structure and function of the embodiment of the present application are the same as the structure and function of the embodiment one, the difference is that: the cross-section and longitudinal section of the first heat dissipation fin 6 are both rectangular, the horizontal section of the first heat dissipation fin 6 is water drop-shaped, and the horizontal section of the first heat dissipation fin 6 is set to be water drop-shaped. The wind resistance coefficient of the water drop is about 0.04-0.05 on average, and the wind resistance coefficient is small, thereby reducing the wind resistance when the wind flows through the first ventilation gap 7, thereby reducing the attenuation of wind force, when the wind flows through the tail of the first heat dissipation fin 6, a vacuum area will be formed in the tail area of ​​the first heat dissipation fin 6, which will generate resistance to the subsequent wind flow, and a Venn-channel designed opening 11 is opened on the side wall of each first heat dissipation fin 6. When the wind flows through the first heat dissipation fin 6, part of the wind flows through the Venn-channel designed opening 11 to disperse the vacuum area at the tail of the first heat dissipation fin 6, thereby reducing air resistance.

[0040] The longitudinal section of the heating channel 4 is in the shape of a reverse Tesla valve. The wind enters the heating channel 4 from the first inlet 2. Due to the great resistance encountered, the flow rate of the wind in the heating channel 4 is very slow. At the same time, the greater the wind flow rate, the greater the pressure caused, and the slower the flow rate of the wind in the heating channel 4. This extends the time the wind stays in the heating channel 4, thereby fully heating the wind flowing through the heating channel 4, ensuring the air output while limiting the wind flow rate.

[0041] The implementation principle of a cylindrical PTC heating element and a heater using the same in Example 2 of the present application is as follows: start the high-speed motor 20, the high-speed motor 20 drives the vortex impeller 19 to rotate to intake air, the wind passes through the annular grille 13 and enters the shell 29 from the air inlet 12, and then according to the user's usage requirements, the stepper motor 24 is started to drive the rotating shaft 25 to rotate, and the rotating shaft 25 rotates to drive the switching damper 23 to open and close the cold air channel and the hot air channel. Part of the wind passes through the first ventilation gap 7 and is output from the shell 29, and the other part of the wind passes through the heating channel 4 and is output from the shell 29.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cylindrical PTC heating element, characterized in that: The invention comprises a columnar PTC heating core (1) for generating heat, wherein the columnar PTC heating core (1) is provided with a first inlet (2) and a first outlet (3), a heating channel (4) is formed between the first inlet (2) and the first outlet (3), a heat dissipation plate (5) is provided on the columnar PTC heating core (1), a plurality of first heat dissipation fins (6) are provided on the heat dissipation plate (5), each of the first heat dissipation fins (6) extends in the longitudinal direction of the columnar PTC heating core (1), and a first ventilation gap (7) is left between two adjacent first heat dissipation fins (6); A plurality of second heat dissipation fins (8) are arranged in the heating channel (4), each of the second heat dissipation fins (8) is fixedly arranged in the heating channel (4), and each of the second heat dissipation fins (8) is arranged along the longitudinal direction of the columnar PTC heating core (1). Extending, a second ventilation gap (27) is left between two adjacent second heat dissipation fins (8); The cross section and longitudinal section of the first heat dissipation fin (6) are both rectangular, and the horizontal section of the first heat dissipation fin (6) is in the shape of a water drop; A Venturi-designed opening (11) is provided on the side wall of each of the first heat dissipation fins (6); An installation groove (9) is provided on the outer wall of the columnar PTC heating core (1), a reinforcing plate (10) is provided in the installation groove (9), and the reinforcing plate (10) is provided between the heat dissipation plate (5) and the columnar PTC heating core (1).

2. A cylindrical PTC heating element according to claim 1, characterized in that: The cross-section, longitudinal section and horizontal section of the first heat dissipation fin (6) and the second heat dissipation fin (8) are all rectangular.

3. A cylindrical PTC heating element according to claim 1, characterized in that: The longitudinal section of the heating channel (4) is in the shape of a reverse Tesla valve.

4. A heater using a cylindrical PTC heating element as claimed in claim 2 or claim 3, characterized in that: The invention comprises a shell (29), wherein a heat-insulating air duct (17) is provided in the shell (29), an air inlet (12) is provided on the shell, an annular grille (13) is provided at the air inlet (12), an air duct isolation plate (14) is provided in the heat-insulating air duct (17), the air duct isolation plate (14) separates the air outlet of the heat-insulating air duct (17) into a cold air outlet (15) and a hot air outlet (16), an air blowing assembly (18) is provided in the shell, the air blowing assembly (18) is provided at the air inlet end of a columnar PTC heating element, the air blowing assembly (18) comprises a vortex impeller (19) and a high-speed motor (20) driving the vortex impeller (19), a motor fixing frame (21) is provided in the shell (29), the high-speed motor (20) is mounted on the motor fixing frame (21), and a switching assembly (22) for switching between cold air and hot air is also provided on the heat-insulating air duct (17).

5. A heater according to claim 4, characterized in that: The switching assembly (22) comprises a switching damper (23) and a rotating shaft (25) rotatably arranged in the shell (29); a stepping motor (24) for driving the rotating shaft (25) to rotate is arranged in the shell (29); the switching damper (23) is fixedly connected to the side wall of the rotating shaft (25); when the heater is in a state of outputting cold air, the switching damper (23) is in a position to block the connection between the air inlet (12) and the hot air outlet (16); a cold air channel is formed between the air inlet (12) and the cold air outlet (15); when the heater is in a state of outputting hot air, the switching damper (23) is in a position to block the connection between the air inlet (12) and the cold air outlet (15); a hot air channel is formed between the air inlet (12) and the hot air outlet (16).

6. A heater according to claim 5, characterized in that: An air duct (26) is provided at the air inlet (12).

Images