PTC heater with grounding device

Abstract

The utility model provides a PTC (Positive Temperature Coefficient) heater with a grounding device, which comprises a tube body, one or more sheet-shaped PTC heating elements are arranged in the tube body, an upper electrode plate and a lower electrode plate are arranged on the upper plane and the lower plane of each PTC heating element, the outer sides of the upper electrode plate and the lower electrode plate are wrapped by an insulating layer to form a PTC heating core, and the grounding device is arranged in the tube body. A grounding piece is arranged on the face, making contact with the pipe body, of the insulating layer, and one end of the grounding piece is provided with a connecting end connected with an external grounding end. Compared with the prior art, the PTC heater has the beneficial effects that the grounding sheet is arranged in the tube body of the PTC heater, the influence on the appearance size of the PTC heater is small, the thickness size of only one grounding sheet is increased in height, the grounding sheet is arranged in the tube body, the sealing performance is good, the grounding sheet is not easily influenced by external moisture or dust, and the grounding reliability is effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a heater, in particular a PTC heater applied to household appliances (such as a sweeper / scrubber), and more particularly to a PTC heater with grounding device. BACKGROUND

[0002] The PTC (Positive Temperature Coefficient) heater is widely used in the field of household appliances due to its self-regulating temperature, high safety, energy saving and other advantages.

[0003] However, with the requirement of miniaturization and intelligentization of household appliances, the PTC heater of the prior art has the following disadvantages: 1. The current grounding mode of PTC is generally to set a grounding point on the surface of the metal shell, such as riveting the grounding terminal on the metal shell, which increases the size of the product and the installation space, which is not conducive to the optimization of the product for the development of miniaturization of household appliances. 2. It is difficult to accurately monitor the temperature of the PTC heater at all times.

[0004] Therefore, there is an urgent need for an improved PTC heater to solve the above problems. CONTENT OF THE INVENTION

[0005] In order to solve the above problems, the present application provides a PTC heater with grounding device, which is committed to improving the performance of the product. The present application provides the following technical solutions:

[0006] A PTC heater with grounding device, comprising a pipe body, one or more sheet-shaped PTC heating elements are arranged in the pipe body, upper and lower electrode sheets are arranged on the upper and lower planes of the PTC heating elements, the outer sides of the upper and lower electrode sheets are wrapped by an insulating layer to form a PTC heating core, a grounding sheet is arranged on the side of the insulating layer in contact with the pipe body, and one end of the grounding sheet is provided with a connecting end connected with an external grounding end.

[0007] Further, the grounding sheet is in the form of a thin sheet with a thickness of 0.1mm-0.5mm, and the width and length of the grounding sheet are substantially equal to the length and width of the electrode sheet.

[0008] Further, in order to detect the surface temperature change of the PTC heater at all times, an NTC sensor is arranged on one plane of the outer end of the pipe body.

[0009] Further, in order to preliminarily control the surface temperature of the PTC heater, the upper electrode sheet in the PTC heating core is connected in series with a temperature controller and a fuse through a cable A.

[0010] Further, the temperature controller and the fuse are connected together directly through a cable B.

[0011] Further, the temperature controller and the fuse can be arranged outside the pipe body and be installed in a temperature control box.

[0012] Further, the tail of the temperature control box is attached to the plane of the pipe body, a recess is arranged for accommodating the NTC sensor, and a clamping jaw is arranged on the bottom side of the temperature control box, the end of the clamping jaw is shaped to match the shape of the NTC sensor.

[0013] Further, the temperature controller and the fuse can also be arranged inside the pipe body, and the NTC sensor can be attached or clamped on any suitable plane outside the pipe body.

[0014] Further, the pipe body is made of aluminum with good heat conductivity, and the heat dissipation surface of the pipe body is shaped as an arc to expand the heat dissipation area.

[0015] Compared with the prior art, the sheet grounding sheet is arranged in the pipe body of the PTC heater, has little influence on the size of the PTC heater, only increases the thickness of the sheet in height, adopts a sheet structure to ensure sufficient contact area, and will not cause quality problems such as poor grounding due to small grounding area, is arranged in the pipe body, has good sealing performance and is not easily affected by external moisture or dust, effectively ensures the reliability of grounding, additionally arranges the NTC sensor, can detect the surface temperature of the PTC heater according to the resistance change rule of the NTC sensor at any time, and improves the controllability of the surface temperature of the PTC heater. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below only show some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0017] Fig. 1 is a finished product schematic diagram of the present application

[0018] Fig. 2 is a part explosion schematic diagram of the present application

[0019] Fig. 3 is a temperature control box schematic diagram in the present application

[0020] Fig. 4 is a finished product cross-sectional view of the present application

[0021] Fig. 5 is a temperature controller and capacitor series connection mode schematic diagram

[0022] 1 - tube body; 2 - PTC heating element; 3 - upper electrode sheet; 4 - lower electrode sheet; 5 - insulation layer; 6 - grounding sheet; 7 - NTC sensor; 8 - temperature controller; 9 - fuse; 10 - temperature control box, 1001 - groove; 1002 - clamping jaw, 11 - cable A; 12 - cable B DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in different drawings denote the same or similar elements throughout the several drawings. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted, and the drawings are not intended to limit the scope of the application unless specifically noted.

[0024] It should be understood that the terms "inner", "outer", "upper", "lower", "head", "tail" and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] The design will be further described below in conjunction with the structural description of the drawings.

[0026] As Figs. 1-2 A PTC heater with grounding device, comprising a tube body 1, one or more sheet-shaped PTC heating elements 2 are arranged in the tube body 1, upper electrode sheets 3 and lower electrode sheets 4 are arranged on the upper and lower planes of the PTC heating elements 2, the outer sides of the upper electrode sheets 3 and the lower electrode sheets 4 are wrapped by an insulation layer 5 to form a PTC heating core, a grounding sheet 6 is arranged on the side of the insulation layer 5 in contact with the tube body 1, and one end of the grounding sheet 6 is provided with a connecting end connected with an external grounding end.

[0027] The manufacturing process of the PTC heater core is a prior art, which will not be described here. After the PTC heating core is manufactured, a grounding sheet 6 is placed on the surface of the PTC heating core, and then the PTC heating core is inserted into the tube body.

[0028] Further, the width and length of the grounding sheet 6 are substantially equal to the length and width of the electrode sheet. Note that the size of the electrode sheet 3 is the same as that of the electrode sheet 4. If the length or width of the grounding sheet 6 is too large, since the insulation layer 5 below the grounding sheet 6 is in the form of a thin sheet, and the electrode sheet is below the insulation layer 5, if the size of the grounding sheet 6 is larger than that of the electrode sheet, when the tube is pressed, the area of the grounding sheet 6 with large size is empty at this time, and the stress edge will bend downward, which is easy to tear or pierce the insulation layer 5. If the length or width of the grounding sheet 6 is too small, when the tube is pressed, the area of the electrode sheet protruding from the grounding sheet 6 is supported by the height of the grounding sheet 6, so the stress is relatively small, resulting in uneven pressure bonding strength between the PTC heating element 2 and the electrode sheet, which further affects the service life of the PTC heater.

[0029] Further, in order to monitor the surface temperature of the PTC heater, an NTC sensor 7 is arranged on a plane of the outer end of the tube body. The technology of detecting temperature according to the resistance change of the NTC sensor 7 is prior art, and thus is not described herein.

[0030] Further, in order to preliminarily control the temperature of the PTC heater, the upper electrode sheet 3 in the PTC heating core is connected in series with a temperature controller 8 and a fuse 9 through a cable A11.

[0031] Further, in order to improve the production efficiency and the reliability of connection, the traditional series connection mode, i.e. butt joint of one pin of the temperature controller 8 and the fuse 9, and then crimping with a buckle, and finally sleeving with an insulating sleeve, is changed to directly connecting the temperature controller 8 and the fuse 9 in series through a cable B12.

[0032] Further, the temperature controller 8 and the fuse 9 can be arranged outside the tube body 1. When the temperature controller 8 and the fuse 9 are arranged outside, in order to protect the working environment from moisture and dust, they are arranged in a temperature control box 10. After being arranged in the temperature control box 10, the port thereof is glued.

[0033] Further, a recess 1001 is arranged on the tail of the temperature control box 10 and the plane of the tube body 1. The recess 1001 is used to accommodate the NTC sensor 7. In order to fix the NTC sensor 7, a clamping jaw 1002 is arranged on the side of the bottom of the temperature control box 10. The shape of the end of the clamping jaw 1002 is consistent with the shape of the NTC sensor 7. For example, when a circular NTC sensor 7 is used, the end of the clamping jaw 1002 is arranged in an arc shape, so as to maintain sufficient contact surface and uniform clamping force between the NTC sensor 7 and the clamping jaw 1002, so as to ensure uniform heating area of the NTC sensor 7 and improve the sensitivity of the NTC sensor 7.

[0034] Further, the temperature controller 8 and the fuse 9 can also be arranged inside the tube body. In this case, the NTC sensor 7 can be pasted or clamped on any suitable plane outside the tube body.

[0035] Further, the tube body 1 is made of aluminum which has good thermal conductivity. In order to increase the contact area between the PTC heater and the body to be heated (such as the roller of a sweeper), the heat dissipation surface of the tube body 1 is arranged in an arc shape.

[0036] Having described embodiments of the application above, the descriptions are illustrative and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art. The selection of terms to be used in the description is intended to best explain the principles of the embodiments, the practical application, or the improvements over the technology in the art, or to enable other of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A PTC heater with a grounding device, comprising a tube (1), wherein one or more sheet-like PTC heating elements (2) are disposed inside the tube (1), and an upper electrode plate (3) and a lower electrode plate (4) are disposed on the upper and lower planes of the PTC heating elements (2), wherein the outer sides of the upper electrode plate (3) and the lower electrode plate (4) are wrapped with an insulating layer (5) to form a PTC heating core, characterized in that: The ground sheet (6) is provided with a connecting end at one end thereof for connecting with an external ground terminal.

2. A PTC heater with grounding device according to claim 1, characterized in that: The ground sheet (6) is in the form of a sheet with a thickness of 0.1-0.5 mm, and the width and length of the ground sheet (6) are substantially equal to the length and width of the electrode sheet.

3. A PTC heater with grounding device according to claim 2, characterized in that: An NTC sensor (7) is provided on a plane of the outer end of the pipe body (1).

4. A PTC heater with grounding device according to claim 3, characterized in that: The upper electrode sheet (3) in the PTC heating core is connected in series with a temperature controller (8) and a fuse (9) through a cable A (11).

5. A PTC heater with grounding device according to claim 4, characterized in that: The temperature controller (8) and the fuse (9) are directly connected in series with each other through a cable B (12).

6. A PTC heater with grounding device according to claim 5, characterized in that: The temperature controller (8) and the fuse (9) can be arranged outside the pipe body (1) and connected in series in a temperature control box (10).

7. A PTC heater with grounding device according to claim 6, characterized in that: The tail of the temperature control box (10) is attached to the plane of the pipe body (1), and a recess (1001) is provided for accommodating the NTC sensor (7), and a clamping claw (1002) is provided on the side of the bottom of the temperature control box (10), and the end of the clamping claw (1002) is shaped to match the shape of the NTC sensor.

8. A PTC heater with grounding device according to claim 5, characterized in that: The temperature controller (8) and the fuse (9) can be arranged inside the pipe body, and the NTC sensor (7) can be attached or clamped on any suitable plane on the outside of the pipe body.

9. A PTC heater with grounding device according to any one of claims 1 to 8, characterized in that: The pipe body (1) is made of aluminum with good heat conductivity, and the heat dissipation surface of the pipe body (1) is shaped as an arc to increase the heat dissipation area.

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