Partitioned multi-resistance heating wire and partitioned heating electric blanket

Abstract

The utility model discloses a partitioned multi-resistance heating wire and a partitioned heating electric blanket. The partitioned multi-resistance heating wire comprises a single-core heating wire and a double-core heating wire, and the single-core heating wire comprises a wire core, a heating wire spirally wound on the wire core and an insulating outer layer wrapping the heating wire. According to the dual-core heating wire, a middle layer and a detection wire which is spirally wound on the middle layer and plays a role in protection are additionally arranged between a heating wire and an insulating outer layer of a single-core heating wire, and the heating wire realizes resistance change of a local position by adjusting the winding distance of the heating wire, so that temperature partitioning is realized. The partition heating electric blanket comprises a blanket body, a control switch and a partition multi-resistance heating wire, the blanket body comprises a leg and foot portion area and a head and chest portion area, the spiral winding distance of a heating wire in the heating wire located in the leg and foot portion area is smaller, the resistance value of the partition is larger, and the heating amount is larger. The electric blanket is simple in structure, convenient to operate and low in manufacturing cost, and has good market application prospects.

Description

Technical Field

[0001] This utility model belongs to the field of electric heating technology, specifically relating to a multi-resistance heating wire with zoned heating and a zoned heating electric blanket. Background Technology

[0002] When people use electric blankets for warmth, their heat preferences and needs vary due to the different physiological characteristics of different parts of the body. Therefore, it is a common design to divide an electric blanket into several independent heating zones to meet the different heat needs of different parts of the body.

[0003] Chinese patent CN200994614Y discloses a zone-controlled temperature electric blanket, in which a heating wire is fixed to different zones of the blanket, and each heating wire is individually controlled by a temperature control device. The temperature of each zone can be adjusted as needed during use. (Attached) Figure 4 The image shows another existing electric blanket, which achieves the function of zoned heating by adjusting the density of the heating wires in different zones.

[0004] While all the aforementioned electric blankets can provide zoned heating, they undoubtedly increase the structural complexity compared to electric blankets that only require a single temperature control switch to operate a single, evenly spaced heating element. This increases production steps and manufacturing costs. Furthermore, the need for manual adjustment of different zone temperatures makes operation inconvenient, especially for elderly users. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a multi-resistance heating wire with partitioned zones, and an electric blanket with partitioned heating made from such a multi-resistance heating wire.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a multi-resistance heating wire with partitions, including a core, a heating wire spirally wound on the core, and an insulating outer layer covering the heating wire. The heating wire forms a spiral winding structure with different spacing at different positions on the core, so that different sections of the heating wire have different resistance values.

[0008] In a preferred embodiment, the core material is high-strength fiber, the heating wire is made of alloy wire, and the insulating outer layer is made of polyvinyl chloride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, or silicone rubber.

[0009] In a preferred embodiment, an intermediate layer and a detection line are further provided between the heating wire and the insulating outer layer. The intermediate layer covers the heating wire, the detection line is spirally wound on the intermediate layer, and the insulating outer layer covers the detection line.

[0010] In a preferred embodiment, the detection lines are formed into a spiral wound structure with the same spacing on the intermediate layer.

[0011] In a preferred embodiment, the detection line is a thermistor with PTC or NTC properties.

[0012] Another aspect of this utility model provides a zoned heating electric blanket, including a blanket body, a control switch and a heating wire. The heating wire is fixed in the interlayer of the blanket body and electrically connected to the control switch. The heating wire is the aforementioned zoned multi-resistance heating wire.

[0013] In a preferred embodiment, the blanket body includes at least a leg and foot section and a head and chest section in the length direction, and the heating wires of the heating wire form spiral winding structures with different spacings in the leg and foot section and the head and chest section, wherein the spacing of the spiral winding structures in the leg and foot section is smaller than the spacing of the spiral winding structures in the head and chest section.

[0014] In a preferred embodiment, the heating wires are arranged in a serpentine structure along the length of the blanket.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The multi-resistance heating wire provided by this utility model can achieve local resistance changes by adjusting the winding spacing of the heating wire, thereby realizing temperature zoning. The electric blanket provided by this utility model can achieve zoning heating function by using the above-mentioned multi-resistance heating wire, which greatly simplifies the overall structure of the electric blanket, reduces the manufacturing process of the electric blanket, and reduces the manufacturing cost.

[0017] (2) The zone heating electric blanket provided by this utility model does not require the use of multiple temperature control switches to regulate the temperature of the heating wires in different zones. Instead, it can be controlled by simply operating one temperature control switch to control one heating wire, which is convenient for users, especially elderly users.

[0018] (3) The multi-resistance heating wire with partition provided by this utility model adds a detection wire with overheat protection function on the basis of the heating wire, which increases the safety of the heating wire and the electric blanket made using the heating wire during use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the single-core partitioned multi-resistance heating wire shown in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the dual-core partitioned multi-resistance heating wire shown in Embodiment 2 of this utility model;

[0021] Figure 3 This is a wiring diagram of the partitioned heating electric blanket shown in Embodiment 3 of this utility model;

[0022] Figure 4 This is a wiring diagram of an existing partitioned heating electric blanket.

[0023] In the diagram: 1. Heating wire; 101. Core wire; 102. Heating wire; 103. Insulating outer layer; 104. Middle layer; 105. Detection wire; 2. Blanket body; 201. Leg and foot section; 202. Head and chest section; 3. Control switch. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] Example 1

[0028] like Figure 1As shown, this embodiment provides a single-core, multi-resistance heating wire, including a core 101, a heating wire 102 spirally wound on the core 101, and an insulating outer layer 103 covering the heating wire 102. The heating wire 102 forms a spiral winding structure with different spacing at different positions on the core 101, resulting in different resistance values ​​in different sections of the heating wire 1. Preferably, the core 101 is made of high-strength fiber, the heating wire 102 is made of alloy wire, and the insulating outer layer 103 is made of polyvinyl chloride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, or silicone rubber to prevent electric shock from contact with the heating wire 1.

[0029] It is important to understand that the heating wire 1 utilizes the resistive heating effect generated when current passes through the heating wire to convert electrical energy into heat energy. In this embodiment, on a fixed-length heating wire 1, the resistance value changes at local locations by adjusting the winding spacing of the heating wire 102, thereby achieving temperature zoning. Specifically, for example, on a 2-meter-long heating wire 1, the resistance of the heating wire 102 is 1 ohm per meter. The winding spacing of the heating wire 102 on the first meter of the heating wire 1 is d, resulting in a longer overall winding and higher resistance. The winding spacing of the heating wire 102 on the second meter of the heating wire 1 is 3d, resulting in a shorter overall winding and lower resistance. Thus, this heating wire 1 exhibits two different resistance values. Under the same power input, the different resistance values ​​result in different heat generation; that is, the higher the resistance, the greater the heat generation, and the lower the resistance, the less heat generation.

[0030] Example 2

[0031] like Figure 2 As shown, this embodiment provides a dual-core, multi-resistance heating wire, which differs from Embodiment 1 in that an intermediate layer 104 and a detection line 105 with protective function are provided between the heating wire 102 and the insulating outer layer 103. The intermediate layer 104 covers the heating wire 102, the detection line 105 is spirally wound on the intermediate layer 104 at the same spacing, and the insulating outer layer 103 covers the detection line 105.

[0032] It should be understood that the structure and principle of temperature zoning achieved by the dual-core heating wire in this embodiment are the same as those of the single-core heating wire in Embodiment 1. That is, by adjusting the winding spacing of the heating wire 102 on a fixed length of heating wire 1, the resistance value of a local position is changed, thereby achieving temperature zoning.

[0033] Preferably, in this embodiment, the detection line 105 is a thermistor with positive temperature coefficient (PTC) or negative temperature coefficient (NTC) properties. The main purpose of the intermediate layer 104 is insulation to prevent short circuits between the heating wire 102 and the detection line 105. Adding a detection line 105 with PTC or NTC properties to the single-core heating wire provides a protective function. The detection line 105 can sense the temperature of the heating wire 1 in real time, preventing overheating. The principle is as follows:

[0034] The characteristic of PTC material is that its initial resistance is very small, but when the temperature exceeds a certain level, the resistance increases abruptly with increasing temperature. In this embodiment, when the detection line 105 is a heating wire with PTC properties, as the heating wire 102 continues to heat up, the temperature of the heating wire 1 continuously rises. As the temperature rises, the resistance of the detection line 105 continuously increases. Therefore, by monitoring the change in the resistance of the detection line 105, it can be determined whether the temperature of the heating wire 1 is too high, thereby providing a protective function.

[0035] The characteristic of NTC material is that its initial resistance is very high, and its resistance decreases continuously as the temperature increases. In this embodiment, when the detection line 105 is a heating wire with NTC properties, as the heating wire 102 continues to heat up, the temperature of the heating wire 1 continuously increases, and the resistance of the detection line 105 decreases as the temperature increases. Therefore, the temperature of the heating wire 1 can be determined by monitoring the change in the resistance of the detection line 105, thereby playing a protective role.

[0036] Example 3

[0037] This embodiment provides a zoned heating electric blanket, including a blanket body 2, a control switch 3, and a heating wire 1. The heating wire 1 is fixed in the interlayer of the blanket body 2 and is electrically connected to the control switch 3. It should be noted that the heating wire 1 is either the single-core zoned multi-resistance heating wire provided in Embodiment 1 or the dual-core zoned multi-resistance heating wire provided in Embodiment 2.

[0038] Figure 3 The wiring diagram of a partitioned heating electric blanket provided in this embodiment is shown in the figure. The blanket body 2 is divided into a leg and foot section 201 and a head and chest section 202 in the length direction. The control switch 3 is located in the middle position near the bottom edge of the blanket body 2. The heating wire 1 is connected in series with the control switch 3. Its first end is first connected to the first end of the control switch 3. Then, the heating wire 1 is wound into a serpentine heating coil in the leg and foot section 201 and the head and chest section 202 of the blanket body 2 with the same winding spacing. The tail end is wound back and connected to the second end of the control switch 3.

[0039] It should be noted that different physiological parts of the human body have different heat requirements. The legs and feet, located at the extremities of the circulatory system and far from the heart, are more susceptible to cold air and therefore require continuous heating at higher temperatures. Conversely, the head and chest are typically the warmest parts of the body; excessive warmth can cause discomfort and a feeling of heat. Therefore, the head and chest require less heating. In this embodiment, the heating wire 102 of the heating wire 1 forms spiral winding structures with different spacings in the leg and foot section 201 and the head and chest section 202. The spacing of the spiral winding structure in the leg and foot section 201 is smaller than that in the head and chest section 202. This allows for a longer heating wire 102 to be wound per unit length of heating wire 1 in the leg and foot section 201, resulting in a higher resistance value and generating more heat with the same power input, thus achieving the zoned heating function of the electric blanket. Furthermore, the serpentine structure of the heating wire 1 in each zone ensures more even and comfortable heating of the body.

Claims

1. A partitioned multi-resistance heating wire comprising a wire core (101), a heating wire (102) spirally wound on the wire core (101), and an insulating outer layer (103) covering the heating wire (102), characterized in that, The heating wire (102) forms spiral winding structures with different pitches at different positions of the wire core (101), so that different sections of the heating wire (1) have different resistance values.

2. The zonal multi-resistance heat generating wire according to claim 1, wherein, The material of the wire core (101) is high-strength fiber, the heating wire (102) is made of alloy wire, and the material of the insulating outer layer (103) is polyvinyl chloride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer or silicone rubber.

3. The zonal multi-resistance heat generating line according to claim 2, characterized in that, An intermediate layer (104) and a detection wire (105) are further arranged between the heating wire (102) and the insulating outer layer (103), the intermediate layer (104) is wrapped outside the heating wire (102), the detection wire (105) is spirally wound on the intermediate layer (104), and the insulating outer layer (103) is wrapped outside the detection wire (105).

4. The zonal multi-resistance heat generating line according to claim 3, characterized in that, The detection wire (105) forms spiral winding structures with the same pitch on the intermediate layer (104).

5. The zonal multi-resistance heat generating line according to claim 3, wherein The detection wire (105) is a heat-sensitive wire with PTC or NTC performance.

6. A partition heating electric blanket comprising a blanket body (2), a control switch (3) and a heating wire (1), the heating wire (1) being fixed in the interlayer of the blanket body (2) and being electrically connected with the control switch (3), characterized in that, The heating wire (1) is a partitioned multi-resistance heating wire according to any one of claims 1-5.

7. The zoned heating blanket of claim 6, wherein, The blanket body (2) includes at least a leg and foot section (201) and a head and chest section (202) in the length direction, and the heating wire (102) of the heating wire (1) forms spiral winding structures with different pitches in the leg and foot section (201) and the head and chest section (202) respectively, wherein the pitch of the spiral winding structure in the leg and foot section (201) is smaller than the pitch of the spiral winding structure in the head and chest section (202).

8. The zoned heating blanket of claim 7, wherein, The heating wire (1) is uniformly arranged in a serpentine structure along the length direction of the blanket body (2).

Images