PTC heater with grounding device on pipe body
By fixing a grounding screw to the PTC heater tube and connecting it with a serrated ring terminal, combined with a thermally conductive aluminum tube and an NTC sensor to monitor the temperature, the problem of poor grounding in floor scrubbers is solved, improving electrical safety and product reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-04-07
AI Technical Summary
Existing PTC heaters in floor scrubbers have a high risk of leakage due to poor grounding, which affects product safety and user trust. In particular, the grounding resistance is high and the grounding performance is unreliable in high humidity environments.
A grounding screw is directly fixed to the tube body of the PTC heater and connected to the tube body through a ring terminal. The terminal has a serrated structure to enhance mechanical interlocking. Combined with the thermally conductive aluminum tube body and NTC sensor to monitor the temperature, a temperature controller and a fuse are used for protection.
It effectively reduces grounding resistance, prevents grounding screws from loosening, improves grounding performance, ensures electrical safety, and enhances product reliability and user trust.
Smart Images
Figure CN224097867U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of heating equipment, in particular to a PTC heater with grounding device on the pipe body. BACKGROUND
[0002] With the popularity of smart home, the scrubber has become the core equipment of household cleaning. PTC (Positive Temperature Coefficient) heater is widely used in hot water cleaning, roller brush drying and other functions of the scrubber due to its rapid heating and self-limiting temperature characteristics. However, the scrubber is in a high humidity and water splashing working environment for a long time, and the electrical safety of the PTC heater faces severe challenges. According to statistics, the failure of the scrubber caused by electric leakage accounts for more than 15%, and poor grounding is one of the key factors leading to safety accidents. The market urgently needs a PTC heater technology that strengthens grounding protection to improve product safety and user trust.
[0003] In the related art, since the PTC heating element cannot be directly contacted with water, a
[0004] The heat conduction component, such as an aluminum pipe and a heat dissipation strip, conducts the heat generated by the PTC heating element to the periphery. The current grounding method is to directly rivet a grounding screw on the heat dissipation strip to reduce the risk of electric leakage of the PTC heater. However, due to the limited installation space of household appliances, the grounding function is still needed after the heat dissipation strip is removed. The current solution is to increase a thin grounding sheet inside the aluminum pipe in order to save space, but the grounding resistance is large, which affects the reliability of the grounding performance.
[0005] Therefore, there is an urgent need for a PTC heater with reliable grounding mode to solve the above problems. CONTENT OF THE UTILITY MODEL
[0006] In order to solve the above problems, the utility model provides a PTC heater with grounding device on the pipe body, which is committed to improving the grounding performance of the product. The utility model provides the following technical scheme:
[0007] A PTC heater with grounding device on the pipe body, comprising a pipe body, one or more sheet-shaped PTC heating elements are arranged in the pipe body, an upper electrode sheet and a lower electrode sheet are arranged on the upper and lower planes of the PTC heating element, the outer side of the upper electrode sheet and the lower electrode sheet is wrapped by an insulating layer to form a PTC heating core, and a grounding device is arranged on the outer side surface of the pipe body.
[0008] Further, the grounding device comprises a grounding screw, the grounding screw is fixed with the pipe body through a ring-shaped terminal, a flat pad is arranged on each of the upper and lower surfaces of the ring-shaped terminal, the ring-shaped terminal is riveted and connected with a grounding wire harness, a plurality of sawteeth are arranged in the inner circle of the ring-shaped terminal, the mechanical interlocking effect is generated through the engagement of the sawteeth and the contact surface, the screw thread back caused by vibration and impact is resisted, and the loosening of the grounding screw is prevented.
[0009] Further, the metal surface of the grounding device is subjected to anti-corrosion and anti-rust surface treatment.
[0010] 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.
[0011] Further, the temperature controller and the fuse can be arranged outside the pipe body and are arranged in a temperature control box.
[0012] Further, in order to monitor the surface temperature of the aluminum pipe at any time, an NTC sensor is arranged on the outer end surface of the pipe body.
[0013] Further, the tail of the temperature control box is attached to the plane of the pipe body, and a recess is arranged, which is used to accommodate the NTC sensor, and the side surface of the bottom of the temperature control box is arranged in a shape corresponding to the shape of the NTC sensor.
[0014] Further, the NTC sensor can be arranged on any outer surface of the pipe body outside the temperature control box.
[0015] Further, the pipe body is made of metal aluminum with good heat conductivity, and in order to expand the heat dissipation area, the heat dissipation surface of the pipe body is made into an arc shape.
[0016] Compared with the prior art, the beneficial effects of the present application are:
[0017] 1. The grounding screw is directly fixed on the pipe body, the grounding resistance is small, and the grounding problem of the surface PTC heater without a heat dissipation strip is solved.
[0018] 2. The grounding screw and the grounding mode with the serrated annular terminal are adopted, and the loosening problem is effectively prevented. DETAILED DESCRIPTION
[0019] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0020] Fig. 1 is a finished product schematic diagram of the present application
[0021] Fig. 2 is an exploded schematic diagram of the parts of the present application
[0022] Fig. 3 is a schematic diagram of the annular terminal in the present application
[0023] Fig. 4 is a schematic diagram of the temperature control box in the present application
[0024] Fig. 5 is a finished product schematic view of another embodiment of the present application
[0025] 1 - tube body; 2 - PTC heating element; 3 - upper electrode sheet; 4 - lower electrode sheet; 5 - insulation layer; 6 - grounding device; 61 - grounding screw; 62 - ring-shaped terminal; 621 - sawtooth; 63 - flat pad; 64 - grounding wire harness; 7 - cable; 8 - temperature controller; 9 - fuse; 10 - temperature control box, 1001 - groove; 11 - sensor; DETAILED DESCRIPTION
[0026] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings indicate the same or similar elements throughout the several aspects. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted.
[0027] It should be understood that the terms "inner", "outer", "upper", "lower", "head", "tail" and the like refer to the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application or simplify 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.
[0028] The design will be further described below in conjunction with the structural description of the drawings.
[0029] As Figs. 1-2 A PTC heater with a grounding device on the tube body, comprising a tube body 1, one or more sheet-shaped PTC heating elements 2 are arranged in the tube body 1, upper and lower electrode sheets 3 and 4 are arranged on the upper and lower planes of the PTC heating elements 2, the outer sides of the upper and lower electrode sheets 3 and 4 are wrapped by an insulation layer 5 to form a PTC heating core, and a grounding device 6 is arranged on the outer surface of the tube body 1.
[0030] The manufacturing process of the PTC heater core is prior art, which will not be described here.
[0031] As Figs. 2-3 Further, the grounding device includes a grounding screw 61, the grounding screw 61 is fixed with the tube body 1 through a ring-shaped terminal 62, in order to prevent loosening, a flat pad 63 is arranged on the upper and lower surfaces of the ring-shaped terminal 62, the ring-shaped terminal 62 is riveted and connected with a grounding wire harness 64, further in order to strengthen the connection strength and ensure the reliability of grounding, a plurality of sawteeth 621 are arranged on the inner circle of the ring-shaped terminal 62, through the engagement of the sawteeth with the contact surface, a mechanical interlocking effect is generated, which resists the back-off of the thread caused by vibration and impact, and effectively prevents the unreliable grounding caused by screw loosening.
[0032] Further, in order to prevent water vapor from penetrating the metal surface of the grounding device 6 in a humid environment, increasing the grounding loop impedance, and the situation that the leakage current cannot be effectively guided away, the metal surface of the grounding device 6 is subjected to surface treatment such as anodic oxidation, electroplating, etc.
[0033] As Fig. 2 Further, in order to preliminarily control the temperature of the PTC heater, the upper electrode sheet 3 in the PTC heating core can be connected in series with a temperature controller 8 and a fuse 9 through a cable 7.
[0034] 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 their working environment from moisture and dust, they are installed in a temperature control box 10, and after installation, glue sealing treatment is performed on the ports thereof.
[0035] As Fig. 2 In order to monitor the surface temperature of the aluminum tube 1 at all times, an NTC 11 sensor is arranged on the outer end surface of the tube body 1.
[0036] As Fig. 4 Further, the tail of the temperature control box 10 is attached to the plane of the tube body 1, and a recess 1001 is arranged, which is used to accommodate the NTC sensor 11. In order to reliably fix the NTC sensor 11, the internal shape of the recess 1001 is arranged to be consistent with the shape of the NTC, so as to maintain sufficient contact surface therebetween and uniform clamping force, so as to ensure uniform heating area of the NTC sensor 11 and improve the sensitivity of the NTC sensor 11.
[0037] Further, the NTC sensor can be arranged on the outer surface of any tube body outside the temperature control box, such as Fig. 5 The NTC sensor 11 can also be arranged on the other end of the tube body 1.
[0038] Further, the tube body 1 is made of metal aluminum with good thermal conductivity, in order to increase the contact area of the PTC heater with the body to be heated (such as the roller of the sweeper), the heat dissipation surface of the tube body 1 is made into an arc shape.
[0039] The above has described the embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or improvements to the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.
Claims
1. A PTC heater with a grounding device on a tube body, comprising a tube body (1), wherein one or more sheet-like PTC heating elements (2) are disposed inside the tube body (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: A grounding device (6) is provided on the outer surface of the tube (1).
2. A PTC heater with a grounding device on the tube body according to claim 1, characterized in that: The grounding device (6) includes a grounding screw (61), which is fixed to the tube body (1) through a ring terminal (62). A flat washer (63) is added to the top and bottom of the ring terminal (62). The ring terminal (62) is riveted to the grounding wire harness (64). The inner ring of the ring terminal (62) is provided with multiple serrations (621). Through the engagement of the serrations (621) with the contact surface of the grounding screw (61), a mechanical interlocking effect is generated to resist the thread retraction caused by vibration and impact, and to prevent the grounding screw (61) from loosening.
3. A PTC heater with a grounding device on the tube body according to claim 2, characterized in that: The metal surface of the grounding device (6) is treated with anti-corrosion and anti-rust surface treatment.
4. A PTC heater with a grounding device on the tube body according to claim 3, characterized in that: The upper electrode plate (3) in the PTC heating core is connected in series with a temperature controller (8) and a fuse (9) via a cable (7).
5. A PTC heater with a grounding device on the tube body according to claim 4, characterized in that: The thermostat (8) and fuse (9) are located outside the tube body (1), and the thermostat (8) and fuse (9) are connected in series and installed in a thermostat box (10).
6. A PTC heater with a grounding device on the tube body according to claim 5, characterized in that: An NTC sensor (11) is provided on one surface of the outer end of the tube (1).
7. A PTC heater with a grounding device on the tube body according to claim 6, characterized in that: The tail of the temperature control box (10) fits against the plane of the tube body (1) and a groove (1001) is provided. The groove (1001) is used to accommodate the NTC sensor (11). The side shape of the bottom of the temperature control box (10) matches the shape of the NTC sensor.
8. A PTC heater with a grounding device on the tube body according to claim 6, characterized in that: The NTC sensor (11) can be placed on the outer surface of any tube (1) other than the temperature control box (10).
9. A PTC heater with a grounding device on the tube body according to any one of claims 1 to 8, characterized in that: The tube body (1) is made of aluminum, which has good thermal conductivity. In order to increase the heat dissipation area, the heat dissipation surface of the tube body (1) is made into an arc shape.