PTC (Positive Temperature Coefficient) electric heater for improving surface temperature uniformity

Abstract

A PTC (Positive Temperature Coefficient) electric heater for improving surface temperature uniformity comprises a power line, a tube body, an insulating layer and a heating core body, the heating core body comprises an upper electrode plate and a lower electrode plate, a plurality of PTC elements are arranged between the upper electrode plate and the lower electrode plate, an electrode connecting block and the upper electrode plate are arranged in the middle of the heating core body, and the insulating layer is arranged between the upper electrode plate and the lower electrode plate. The middle of each lower electrode plate is provided with a wire outlet end, the two wire outlet ends are installed in the grooves of the electrode connecting blocks and connected with a power line, and the middle of the tube body and the middle of the insulating layer are provided with corresponding wire outlets. The beneficial effects of the utility model are that because the leading-out terminal is arranged at the middle position, the problem that the temperature difference between the two ends of the PTC heater is large is solved, and furthermore, when the PTC heater works, the electrode connecting block arranged at the middle takes away a certain amount of heat, thereby playing a certain role in reducing the temperature of the middle PTC element, reducing the temperature difference between the middle position and the periphery, and prolonging the service life of the PTC heater. And the uniformity of the surface temperature of the PTC heater is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric heating technical field especially improves a kind of PTC electric heater of surface temperature uniformity. BACKGROUND

[0002] PTC electric heater is a kind of electric heater based on semiconductor material, its working principle is to use the characteristics of PTC positive temperature coefficient material to heat, in the power-on state can itself heat, with high thermal efficiency, power, no open fire, safety and other advantages, is the ideal material of heating device.

[0003] The power of PTC heating element is often directly related to the heat dissipation condition, when the heat dissipation condition is good, the power is large, otherwise, the power is small. For example, in the wind type PTC electric heater, the characteristics are particularly obvious, when the ambient temperature is low and the air volume is large, the power of PTC heater is relatively large, otherwise, when the ambient temperature is high and the air volume is small, the power of PTC heater is relatively small.

[0004] At present, multiple heat sources, i.e. PTC elements, are often arranged in parallel in the PTC heater, and finally connected to the power supply at one side. The connection of the power supply end occupies a large space due to the need to install a temperature controller and rivet terminals, resulting in a large area that does not heat at this end, and a large temperature difference with the other end. In addition, when heating, the temperature of the PTC elements in the middle is obviously higher than that of the PTC elements at both ends, which seriously affects the uniformity of the surface temperature of the PTC heater. Therefore, a structure that can improve the uniformity of the surface temperature is needed to solve the above problems. SUMMARY

[0005] In order to solve the above problems, the utility model provides a kind of PTC electric heater for improving the uniformity of surface temperature, it includes: power line, pipe body, insulating layer, heating core body, heating core body contains upper electrode sheet, lower electrode sheet, multiple PTC elements are arranged between upper electrode sheet and lower electrode sheet, electrode connecting block is arranged at the middle position of heating core body, upper electrode sheet, lower electrode sheet middle position is equipped with outgoing line end, two outgoing line ends are installed at electrode connecting block, outgoing line end is connected with power line, pipe body, insulating layer middle position is equipped with corresponding outgoing line port.

[0006] Further, a groove is provided on one plane of the electrode connecting block.

[0007] Further, two grooves are provided in the groove of the electrode connecting block and in the length direction of the electrode sheet, and the outgoing line end of the lower electrode sheet is inserted into the electrode connecting block through the grooves, so that the outgoing line end of the lower electrode sheet and the outgoing line end of the upper electrode sheet are in the same plane of the electrode connecting block.

[0008] Further, the recess of the electrode connecting block is provided with a separation rib to separate the upper and lower electrode sheets to prevent short circuit of the circuit, and the recess is provided with a baffle rib on both sides in the width direction to prevent the upper and lower electrode sheets from falling off.

[0009] Further, the upper and lower electrode sheets, the PTC element, the electrode connecting block and the outgoing line end of the electrode sheet are bonded by heat-conducting silica gel and are integrated by power supply and pressure.

[0010] Further, the PTC element is arranged in an equal number on the opposite sides of the electrode connecting block to ensure that the temperatures on both sides are relatively uniform.

[0011] Further, the power supply line is welded and connected to the outgoing line end of the upper and lower electrode sheets and is then connected in series with a temperature controller.

[0012] Further, the pipe body is provided with a temperature controller protection box on the outgoing line side of the upper surface of the power supply line.

[0013] Further, the heating surface of the pipe body is in the shape of an arc.

[0014] Further, the electrode connecting block is made of temperature-resistant and insulating material.

[0015] Compared with the prior art, the beneficial effects of the present application are that the outgoing line end is arranged at the middle position, the problem of large temperature difference between the two ends of the PTC heater is solved, and when working, the electrode connecting block arranged at the middle position can take away a certain amount of heat, thereby reducing the temperature of the middle PTC element and reducing the temperature difference between the middle position and the periphery, and the uniformity of the surface temperature of the PTC heater is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings included in the specification and forming a part of the specification illustrate exemplary embodiments, features, and aspects of the present application and serve to explain the principles of the present application.

[0017] Figure 1 It is an assembly diagram of the PTC electric heater for improving the uniformity of the surface temperature of the present application.

[0018] Figure 2 It is an explosion effect schematic view of the PTC electric heater for improving the uniformity of the surface temperature of the present application.

[0019] Figure 3 It is an explosion effect schematic view of the heating core of the present application.

[0020] Figure 4 It is a structure diagram of the electrode connecting block of the present application.

[0021] Figure 5The heating core part assembly position schematic view of the utility model.

[0022] 1-power line;

[0023] 2-temperature control assembly;201-temperature controller;202-temperature controller protection box;

[0024] 3-tube body;301-tube body outlet;

[0025] 4-insulating layer;401-insulating layer outlet;

[0026] 5-heating core body;501-upper electrode piece;501A-upper electrode piece outlet;502-PTC element;503-electrode connecting block;503A-groove;503B-groove;503C-isolation rib;503D-baffle rib;504-lower electrode piece;504A-lower electrode piece outlet; DETAILED DESCRIPTION

[0027] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings represent functionally the same or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0028] Wherein, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model or simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0029] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0030] The word "exemplary" here means "serving as an example, embodiment or illustration". Any embodiment described as "exemplary" here is not necessarily to be construed as superior or better than other embodiments.

[0031] In addition, for a better understanding of the present application, numerous specific details are given in the following detailed description. One skilled in the art will understand that the present application can be practiced without certain specific details. In some instances, well-known methods, structures, elements, and circuits have not been described in detail in order to avoid obscuring the present application.

[0032] The structure of the drawings will be described below, and the design will be further described.

[0033] As shown in Figures 2-3 , a PTC electric heater for improving surface temperature uniformity includes a power line 1, a tube body 3, an insulation layer 4, a heating core 5, and the heating core 5 contains an upper electrode sheet 501, a lower electrode sheet 504, a plurality of PTC elements 502 are arranged between the upper electrode sheet 501 and the lower electrode sheet 504, an electrode connecting block 503 is arranged at the middle position of the heating core 5, an upper electrode sheet outlet end 501A is arranged at the middle position of the upper electrode sheet 501, a lower electrode sheet outlet end 504A is arranged at the middle position of the lower electrode sheet 504, the upper electrode sheet outlet end 501A and the lower electrode sheet outlet end 504A are both installed at the electrode connecting block 503, the upper electrode sheet outlet end 501A and the lower electrode sheet outlet end 504A are both connected with the power line 1, the tube body 3 is arranged at the middle position of the tube body 3, and the insulation layer 4 is arranged at the middle position of the insulation layer 4.

[0034] As shown in Figure 4 , preferably, a groove 503B is arranged on one plane of the electrode connecting block 503, two grooves 503A are arranged in the groove 503B in the length direction of the electrode sheet, the outlet end 504A of the lower electrode sheet is inserted into the electrode connecting block 503 through the groove 503A, so that the outlet end 504A of the lower electrode sheet and the outlet end 501A of the upper electrode sheet are in the same plane on the same side of the electrode connecting block 503, so as to ensure that the power line 1 is on the same side and facilitate installation.

[0035] As shown in Figure 4 , preferably, a separation rib 503C is arranged in the groove 503B to separate the upper and lower electrode sheets and prevent the two electrode sheets from contacting and causing a short circuit. A baffle rib 503D is arranged on both sides of the groove 503B in the width direction to pre-install the upper electrode sheet 501 and the lower electrode sheet 504 in the groove 503B to prevent the electrode sheets from falling off after pre-installation.

[0036] As shown in Figures 2-3, preferably, the upper electrode sheet 501, the lower electrode sheet 504, the PTC element 502, the electrode connecting block 503 and the outgoing line ends 501A, 504A of the upper and lower electrode sheets are bonded by heat-conducting silica gel, and are wrapped by an insulation layer 1, and finally are inserted into a pipe body 3, wherein the pipe body 3 and the insulation layer 4 are provided with outgoing line ports 301, 401 at the middle positions and matched with the positions of the electrode connecting block 503, and then are solidified into an integrated body by energization and pressurization.

[0037] As Figure 2 , preferably, the PTC element 502 is arranged in an equal number on the opposite sides of the electrode connecting block 503 to ensure the relative uniformity of the temperatures on the two sides.

[0038] Preferably, the power line 1 is first welded and connected to the outgoing line ends 501A, 504B of the upper and lower electrode sheets, and then is connected in series with a temperature controller 201.

[0039] Preferably, the pipe body 3 is provided with a temperature controller protection box 202 on the upper surface of the outgoing line side of the power line.

[0040] Preferably, the heating surface of the pipe body 3 is in a circular arc shape to effectively increase the heating area.

[0041] Preferably, the electrode connecting block 503 is made of temperature-resistant and insulating material.

Claims

1. A PTC electric heater for improving surface temperature uniformity, comprising: The device comprises a power cord (1), a tube (3), an insulation layer (4), and a heating core (5). The heating core (5) includes an upper electrode plate (501) and a lower electrode plate (504). Multiple PTC elements (502) are disposed between the upper electrode plate (501) and the lower electrode plate (504). The device is characterized by having an electrode connection block (503) located in the middle of the heating core (5) and an upper electrode plate lead-out end (501A) located in the middle of the upper electrode plate (501). The lower electrode plate (504) has a lower electrode plate output terminal (504A) in the middle position. The upper electrode plate output terminal (501A) and the lower electrode plate output terminal (504A) are both installed at the electrode connecting block (503). The upper electrode plate output terminal (501A) and the lower electrode plate output terminal (504A) are both connected to the power line (1). The tube body (3) has a tube body output port (301) in the middle position, and the insulation layer (4) has an insulation layer output port (401) in the middle position.

2. The PTC electric heater for improving surface temperature uniformity according to claim 1, characterized in that: The electrode connecting block (503) has a groove (503B) on one plane.

3. A PTC electric heater for improving surface temperature uniformity according to claim 2, characterized in that: The electrode connecting block has two grooves (503A) in the groove (503B) along the length of the electrode sheet. The lead end (504A) of the lower electrode sheet is inserted into the electrode connecting block (503) through the groove (503A), so that the lead end (504A) of the lower electrode sheet and the lead end (501A) of the upper electrode sheet are in the same plane of the electrode connecting block (503).

4. A PTC electric heater for improving surface temperature uniformity according to claim 3, characterized in that: The groove (503B) is provided with an isolation rib (503C) to separate the upper electrode plate (501) and the lower electrode plate (504). The groove (503B) is provided with baffle ribs (503D) on both sides in the width direction to pre-install the upper electrode plate (501) and the lower electrode plate (504) into the groove (503B).

5. A PTC electric heater for improving surface temperature uniformity according to claim 4, characterized in that: The upper electrode (501), lower electrode (504), and PTC element (502) are bonded together with thermally conductive silicone, and then cured into one piece by applying electricity and pressure.

6. A PTC electric heater for improving surface temperature uniformity according to claim 5, characterized in that: The number of PTC elements (502) arranged on opposite sides of the electrode connection block (503) is equal.

7. A PTC electric heater for improving surface temperature uniformity according to claim 6, characterized in that: The power cord (1) is first welded to the output end (501A) of the upper electrode plate and the output end (504A) of the lower electrode plate, and then connected in series with a temperature controller (201).

8. A PTC electric heater for improving surface temperature uniformity according to claim 7, characterized in that: A temperature controller protection box (202) is provided on the power line outlet side of the upper surface of the tube (3).

9. A PTC electric heater for improving surface temperature uniformity according to any one of claims 1 to 8, characterized in that: The heating surface of the tube (3) is arc-shaped.

10. A PTC electric heater for improving surface temperature uniformity according to claim 9, characterized in that: The electrode connecting block (503) is made of heat-resistant and insulating material.

Images