PTC heater and dishwasher drying system

Abstract

The PTC heater comprises a heating body and a radiator, the radiator comprises a heating body fixing frame and cooling fins, the heating body is tightly pressed in the heating body fixing frame, and the cooling fins are fixed on the heating body fixing frame at intervals in the length direction of the heating body fixing frame. And heat dissipation air channels in the width direction of the heating body fixing frame are formed by the intervals among the heat dissipation fins. In the PTC heater provided by the utility model, the heating body is tightly pressed in the heating body fixing frame, the radiating fins are fixed on the heating body fixing frame at intervals along the length direction of the heating body fixing frame, and the intervals among the radiating fins mutually form the radiating air channels along the width direction of the heating body fixing frame. By means of the structure, cold air flowing through the PTC heater can pass through the heating body and the cooling fins, then the cold air can be evenly heated, heating of the cold air is more sufficient, the heat exchange efficiency is improved, in addition, all the cooling fins make full contact with the heating body, and the heat dissipation effect of the PTC heater can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a PTC heater and a dishwasher drying system. Background Art

[0002] Chinese patent document number CN106304429A disclosed a PTC heater structure on January 4, 2017, including: a silicone frame, a heating chip arranged inside the silicone frame, a positive electrode sheet connected to one side of the silicone frame, a negative electrode sheet connected to one side of the heating chip, a first ceramic insulating sheet connected to one side of the positive electrode sheet, a second ceramic insulating sheet connected to one side of the negative electrode sheet, a first heat dissipation belt connected to one side of the first ceramic insulating sheet, and a second heat dissipation belt connected to one side of the second ceramic insulating sheet. The first heat dissipation belt of this PTC heater is located on one side of the first ceramic insulating sheet, the second heat dissipation belt is located on one side of the second ceramic insulating sheet, the heating chip is located in the middle of the heater, and the heat dissipation belts are respectively located on the two side edges of the heater, so the heat dissipation effect of the heater is poor, resulting in low heating efficiency of the heater. In addition, the above structure makes the PTC heater heat the cold air unevenly, resulting in insufficient heating of some cold air.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The utility model aims to provide a PTC heater and a dishwasher drying system with simple structure, good heat dissipation effect, high heating efficiency, small wind resistance and strong practicality, so as to overcome the shortcomings of the prior art.

[0005] A PTC heater designed for this purpose is characterized in that it includes a heating element and a radiator, the radiator includes a heating element fixing frame and a heat sink, the heating element is tightly pressed inside the heating element fixing frame, the heat sink is fixed on the heating element fixing frame at intervals along the length direction of the heating element fixing frame, and the intervals between the heat sinks form a heat dissipation duct along the width direction of the heating element fixing frame.

[0006] One side of the heat sink is provided with an enclosed flange, and the flanges of each heat sink are spaced apart along the length direction of the heating element fixing frame to jointly form the heating element fixing frame.

[0007] The heating element is riveted to each heat sink respectively so that the heating element is fixed inside the heating element fixing frame.

[0008] Terminals for connecting a live wire, a neutral wire and a ground wire are respectively led out from the ends of the heating element. The terminals extend along the length direction of the heating element fixing frame and are located on the outside of the radiator.

[0009] A fuse is arranged on the live wire; or a thermostat is arranged on the heat dissipation air duct, and the thermostat is electrically connected to the heating element.

[0010] A dishwasher drying system designed for this purpose includes an air inlet duct assembly, characterized in that a maintenance window with an opening is provided on the air inlet duct assembly, the PTC heater is installed in the maintenance window, a cover for opening and closing the maintenance window is covered at the opening of the maintenance window, buckles are provided on both sides of the maintenance window, buckle positions are provided on both sides of the cover, and the buckles and the buckle positions are buckled with each other to fix the cover on the air inlet duct assembly.

[0011] The air inlet duct assembly is provided with a threading hole, which is located at one side of the maintenance window and is connected to the maintenance window. The terminal extends laterally out of the air inlet duct assembly through the threading hole.

[0012] The air inlet duct assembly is provided with a threading opening, which is located on one side of the cover and is connected to the maintenance window. The wires led out of the thermostat are led out of the air inlet duct assembly through the threading opening.

[0013] The dishwasher includes an outer shell and an inner tank arranged in the outer shell. A side panel is opened and closed on one side of the outer shell. An air inlet duct assembly is installed on one side of the inner tank and is located between the inner tank and the side panel. The opening of the maintenance window is arranged toward the side panel. When the side panel is opened, the air inlet duct assembly is exposed, and when the maintenance window is opened, the PTC heater is exposed.

[0014] The air inlet duct assembly is provided with an air inlet hole and an air outlet hole connected to the inner tank, and an air duct is provided inside the air inlet duct assembly. The air inlet hole, the air duct and the air outlet hole are connected in sequence, and the PTC heater is arranged on the air duct.

[0015] In the PTC heater of the present invention, the heating element is tightly pressed inside the heating element fixing frame, and the heat sinks are fixed on the heating element fixing frame at intervals along the length direction of the heating element fixing frame. The intervals between the heat sinks form a heat dissipation duct along the width direction of the heating element fixing frame, so that the cold air flowing through the PTC heater will pass through the heating element and the heat sink, thereby making the cold air evenly heated, and the heating of the cold air is more sufficient, thereby improving the heat exchange efficiency. In addition, the above structure makes each heat sink fully contact with the heating element, thereby improving the heat dissipation effect of the PTC heater, thereby improving the heating efficiency. In addition, the terminal is arranged along the The heating element fixing frame extends in the length direction, and the terminal is located on the outside of the radiator, so that the terminal is not in the heat dissipation duct or in the direction of the heat dissipation duct. Therefore, the terminal will not block the wind flowing through the PTC heater, and the cold air entering the air inlet duct assembly basically passes through the PTC heater, so that the cold air can be fully heated by the PTC heater, and the heating efficiency is high; the PTC heater is arranged in the maintenance window of the air inlet duct assembly and is sealed by a cover. The cover and the air inlet duct assembly are connected by a snap, which is convenient for removing the cover. After the cover is removed, the PTC heater is exposed, making the maintenance of the PTC heater more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a heater in a first application example of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the exploded structure of a heater in a first application example of an embodiment of the present utility model.

[0018] Figure 3 The figure is a schematic diagram of the overall structure of the heat sink in one embodiment of the utility model.

[0019] Figure 4 This is a schematic diagram of the overall structure of a respirator in a first application example of an embodiment of the utility model.

[0020] Figure 5 This is a schematic diagram of the exploded structure of a respirator in a first application example of an embodiment of the present utility model.

[0021] Figure 6 This is a schematic diagram of the overall structure of the respirator in another aspect of the first application example of an embodiment of the present utility model.

[0022] Figure 7 This is a schematic diagram of the exploded structure of a respirator in a second application example of an embodiment of the present utility model.

[0023] Figure 8 This is a simplified cross-sectional view of a dishwasher in a first application example of an embodiment of the present utility model.

[0024] Fig. 9 It is a cross-sectional view of a heater in a first application example of an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] See also Figure 1-Figure 9 The PTC heater comprises a heating element 1 and a radiator 2. The radiator 2 comprises a heating element fixing frame 5 and a heat sink 4. The heating element 1 is tightly pressed inside the heating element fixing frame 5. The heat sink 4 is fixed on the heating element fixing frame 5 at intervals along the length direction of the heating element fixing frame 5. The intervals between the heat sinks 4 mutually form a heat dissipation duct 3 along the width direction of the heating element fixing frame 5. The heat sink 4 is used to dissipate the heat generated by the heating element 1.

[0027] An enclosed flange 6 is provided on one side of the heat sink 4 , and the flanges 6 of the heat sink 4 are spaced apart along the length direction of the heating element fixing frame 5 to form the heating element fixing frame 5 together.

[0028] The heating element 1 is riveted to each heat sink 4 respectively, so that the heating element 1 is fixed inside the heating element fixing frame 5 .

[0029] The heating element 1 is a PTC ceramic heating element, and the heat sink 4 is an aluminum fin.

[0030] The end 31 of the heating element 1 has terminals 7 for connecting the live wire 13 , the neutral wire 14 , and the ground wire 16 . The terminals 7 extend along the length direction of the heating element fixing frame 5 , and the terminals 7 are located outside the radiator 2 .

[0031] A fuse 24 is provided on the live wire 13; alternatively, a thermostat 32 is provided on the heat dissipation duct 3, the thermostat 32 is electrically connected to the heating element 1, and the thermostat 32 is an over-temperature thermostat. When the temperature of the heating element 1 is too high, the thermostat 32 is disconnected to stop the heating element 1 from working.

[0032] The dishwasher drying system comprises an air inlet duct assembly 8, on which a maintenance window 9 with an opening is provided, in which the PTC heater A is installed, and the opening of the maintenance window 9 is covered with a cover 10 for opening and closing the maintenance window 9, buckles 11 are provided on both sides of the maintenance window 9, and buckle positions 12 are provided on both sides of the cover 10, and the buckles 11 and the buckle positions 12 are buckled with each other to fix the cover 10 on the air inlet duct assembly 8.

[0033] A wire hole 15 is provided on the air inlet duct assembly 8, and the wire hole 15 is located on one side of the maintenance window 9, and the wire hole 15 is connected to the maintenance window 9. The terminal 7 extends laterally out of the air inlet duct assembly 8 through the wire hole 15, so that the live wire 13, the neutral wire 14, and the ground wire 16 are located outside the air inlet duct assembly 8, which is convenient for wiring.

[0034] The air inlet duct assembly 8 is provided with a threading opening 33, which is located on one side of the cover 10. The threading opening 33 is connected to the maintenance window 9. The wires 23 led out of the thermostat 32 are led out of the air inlet duct assembly 8 through the threading opening 33 for easy wiring.

[0035] The dishwasher includes an outer shell 17 and an inner tank 18 arranged in the outer shell 17. A side panel 19 is opened and closed on one side of the outer shell 17. An air inlet duct assembly 8 is installed on one side of the inner tank 18 and is located between the inner tank 18 and the side panel 19. The opening of the maintenance window 9 is arranged toward the side panel 19. When the side panel 19 is opened, the air inlet duct assembly 8 is exposed, and when the maintenance window 9 is opened, the PTC heater A is exposed. At this time, the PTC heater A can be conveniently disassembled and maintained.

[0036] The air inlet duct assembly 8 is provided with an air inlet hole 20 and an air outlet hole 21 connected to the inner tank 18 . An air duct 22 is provided inside the air inlet duct assembly 8 . The air inlet hole 20 , the air duct 22 and the air outlet hole 21 are connected in sequence. The PTC heater A is arranged on the air duct 22 .

[0037] The air duct 22 includes an air inlet channel 25 and an air outlet channel 26. The air inlet channel 25 is connected to the air inlet hole 20, and the air outlet channel 26 is connected to the air outlet hole 21. The air outlet holes 21 are respectively arranged on both sides of the air outlet channel 26. A damper 27 for connecting or cutting off the air inlet channel 25 and the air outlet channel 26 is arranged between the air inlet channel 25 and the air outlet channel 26. The PTC heater A is arranged on the air inlet channel 25.

[0038] The damper 27 is rotatably arranged in the air inlet duct assembly 8, and a limiting plate 28 is arranged on the air inlet duct assembly 8. When no external air enters the air inlet duct assembly 8, the damper 27 rotates downward under the action of gravity, and the other end of the damper 27 abuts against the limiting plate 28. At this time, the air inlet channel 25 and the air outlet channel 26 are cut off and disconnected from each other. When external air enters the air inlet duct assembly 8, the external wind pushes the damper 27 to rotate upward, and at this time, the air inlet channel 25 and the air outlet channel 26 are connected.

[0039] The dishwasher drying system further includes a fan, which is disposed outside the air inlet 20 , and an air outlet of the fan is connected to the air inlet 20 , or the fan is disposed in the air inlet channel 25 .

[0040] like Figure 5 As shown by the arrow, when the fan is working, external cold air enters the air inlet channel 25 through the air inlet hole 20, and is then heated by the PTC heater A. The hot air then pushes open the damper 27 and enters the air outlet channel 26, and finally flows into the inner tank 18 through the air outlet hole 3 to dry the tableware in the inner tank 18.

[0041] The air inlet duct assembly 8 includes a first shell 29 and a second shell 30 that are clamped together. An air duct 22 is formed between the first shell 29 and the second shell 30 . The maintenance window 9 and the air outlet 21 are arranged on the first shell 29 .

[0042] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A PTC heater, characterized in that: The heat sink (2) comprises a heating element (1) and a radiator (2), wherein the radiator (2) comprises a heating element fixing frame (5) and a heat sink (4), wherein the heating element (1) is tightly pressed inside the heating element fixing frame (5), and the heat sink (4) is fixed to the heating element fixing frame (5) at intervals along the length direction of the heating element fixing frame (5), and the intervals between the heat sinks (4) mutually form a heat dissipation duct (3) along the width direction of the heating element fixing frame (5).

2. The PTC heater according to claim 1, characterized in that: An enclosed flange (6) is provided on one side of the heat sink (4), and the flanges (6) of the heat sinks (4) are spaced apart along the length direction of the heating element fixing frame (5) to form the heating element fixing frame (5) together.

3. The PTC heater according to claim 2, characterized in that: The heating element (1) is riveted to each heat sink (4) respectively, so that the heating element (1) is fixed inside the heating element fixing frame (5).

4. The PTC heater according to claim 3, characterized in that: Terminals (7) for connecting a live wire (13), a neutral wire (14), and a ground wire (16) are respectively led out from the end portion (31) of the heating element (1), the terminals (7) extending along the length direction of the heating element fixing frame (5), and the terminals (7) are located outside the heat sink (2).

5. The PTC heater according to claim 4, characterized in that: A fuse (24) is provided on the live wire (13); or a thermostat (32) is provided on the heat dissipation duct (3), and the thermostat (32) is electrically connected to the heating element (1).

6. A dishwasher drying system, comprising an air inlet duct assembly (8), characterized in that: The air inlet duct assembly (8) is provided with a maintenance window (9) having an opening, the maintenance window (9) having a PTC heater (A) as claimed in claim 5 installed therein, the opening of the maintenance window (9) being covered with a cover (10) for opening and closing the maintenance window (9), buckles (11) being provided on both sides of the maintenance window (9), buckles (12) being provided on both sides of the cover (10), the buckles (11) and the buckles (12) being buckled with each other so that the cover (10) is fixed on the air inlet duct assembly (8).

7. The dishwasher drying system according to claim 6, characterized in that: The air inlet duct assembly (8) is provided with a threading hole (15), the threading hole (15) is located on one side of the maintenance window (9), and the threading hole (15) is connected to the maintenance window (9), and the terminal (7) extends laterally out of the air inlet duct assembly (8) through the threading hole (15).

8. The dishwasher drying system according to claim 6, characterized in that: The air inlet duct assembly (8) is provided with a wire threading opening (33), the wire threading opening (33) being located on one side of the cover (10), the wire threading opening (33) being connected to the maintenance window (9), and the wire (23) led out of the thermostat (32) is led out of the air inlet duct assembly (8) through the wire threading opening (33).

9. The dishwasher drying system according to claim 6, characterized in that: The dishwasher comprises an outer shell (17) and an inner tank (18) arranged in the outer shell (17); a side panel (19) is provided on one side of the outer shell (17) for opening and closing; an air inlet duct assembly (8) is installed on one side of the inner tank (18) and is located between the inner tank (18) and the side panel (19); an opening of a maintenance window (9) is arranged toward the side panel (19); when the side panel (19) is opened, the air inlet duct assembly (8) is exposed; and when the maintenance window (9) is opened, the PTC heater (A) is exposed.

10. The dishwasher drying system according to claim 6, characterized in that: The air inlet duct assembly (8) is provided with an air inlet hole (20) and an air outlet hole (21) connected to the inner liner (18); an air duct (22) is provided inside the air inlet duct assembly (8); the air inlet hole (20), the air duct (22) and the air outlet hole (21) are connected in sequence; and the PTC heater (A) is provided on the air duct (22).

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