A fixing structure for the bent part of the heating wire of an electric blanket and an electric blanket

Abstract

This utility model belongs to the field of electric blanket technology, and discloses a fixing structure for the bent portion of the heating wire in an electric blanket and an electric blanket. It includes a first fixing layer and a second fixing layer. The first fixing layer includes a first supporting layer and a first adhesive layer coated on either side thereof; the second fixing layer includes a second supporting layer and a second adhesive layer coated on either side thereof; both the first and second supporting layers are flexible structures, and the bent portion of the heating wire is placed between the first and second fixing layers; wherein the first and second adhesive layers are both located close to the bent portion of the heating wire, and are adhered and fixed together. This utility model not only has high reliability in fixing the bent portion of the heating wire, but also has low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of electric blanket technology, specifically to a fixing structure for the bent part of the heating wire of an electric blanket and an electric blanket. Background Technology

[0002] An electric blanket is a common heating device, consisting of a blanket body and a controller that work together. The blanket body includes at least two fabric layers and heating wires disposed between the fabric layers. When the heating wires are energized, and under the control of the controller, heat is generated according to the user's desired temperature.

[0003] To improve heat distribution and enhance user comfort when using electric blankets, existing electric blankets typically employ S-shaped reciprocating heating wires. To secure these wires and prevent them from coiling and causing abnormal heating, which could lead to fabric fires or burns, a common approach in current technology is to quilt channels within the fabric layer. The heating wires are then passed sequentially through these channels from one end. This design effectively limits the movement of the heating wires within the quilted channels.

[0004] However, in electric blankets using quilted tubing for heating wire fixation, it's impossible to effectively secure the bends in the heating wire formed during reciprocating deployment. This leads to a high risk of curling at the bends. While some existing electric blankets use adhesive or sewing methods to fix the bends, both have their own technical drawbacks. Specifically, with adhesive methods, the adhesive layer is in direct contact with the fabric layer, increasing the risk of separation and loss of fixation with repeated use. With sewing methods, the bends in the heating wire must first be sewn into additional non-woven fabric before being fixed to the fabric layer; this results in a complex process and a long processing time. Summary of the Invention

[0005] The purpose of this utility model is to provide a fixing structure for the bending part of the heating wire of an electric blanket and an electric blanket to solve the technical problems of existing fixing structures for the bending part of the heating wire being incompatible, having a high risk of fixing failure, or being too complex in process.

[0006] To achieve the above objectives, the present invention proposes the following technical solution: In the first aspect, this technical solution provides a fixing structure for the bent portion of the heating wire of an electric blanket, including: a first fixing layer and a second fixing layer; The first fixing layer includes a first surface support layer and a first adhesive layer coated on either side thereof; the second fixing layer includes a second surface support layer and a second adhesive layer coated on either side thereof. Both the first and second support layers are flexible structures, and the bent portion of the heating wire is placed between the first and second fixing layers; wherein, both the first and second adhesive layers are located close to the bent portion of the heating wire, and the first and second adhesive layers are bonded and fixed together.

[0007] Furthermore, the length of the first fixing layer is less than the length of the second fixing layer; When the first fixing layer and the second fixing layer are glued together, there are gaps on both sides of the second fixing layer; the second adhesive layer with the gaps on both sides is glued to the fabric layer opposite to it.

[0008] Furthermore, when the first fixing layer and the second fixing layer are glued together, their common ends are sewn together to any adjacent fabric layer.

[0009] Furthermore, both the first adhesive layer and the second adhesive layer are TPU hot melt adhesive, PES hot melt adhesive, or PA hot melt adhesive.

[0010] Furthermore, both the first and second surface support layers are non-woven fabrics.

[0011] Furthermore, both the first fixing layer and the second fixing layer are adhesive-backed nonwoven fabrics.

[0012] Furthermore, it includes two sets of first fixing layers and second fixing layers; corresponding to the bending portions of the heating wire formed on both sides when the heating wire is bent back and forth.

[0013] Furthermore, the widths of both the first fixing layer and the second fixing layer are not less than the minimum width of the corresponding side heating wire bend.

[0014] Secondly, this technical solution provides an electric blanket, including the aforementioned fixing structure.

[0015] Furthermore, it includes a fabric layer with several quilted channels spaced apart on the fabric layer; heating wires are repeatedly threaded through each quilted channel.

[0016] Beneficial effects: This technical solution provides a fixing structure for the bent part of the heating wire in an electric blanket, which simultaneously solves the problems of high cost or low reliability in the current fixing of the bent part of the heating wire.

[0017] The fixing structure includes a first fixing layer and a second fixing layer that cooperate with the bent portion of the heating wire. The first fixing layer includes a first supporting layer and a first adhesive layer coated on either side thereof; the second fixing layer includes a second supporting layer and a second adhesive layer coated on either side thereof. Specifically, both the first and second supporting layers are flexible structures, and the bent portion of the heating wire is placed between the first and second fixing layers; wherein, both the first and second adhesive layers are disposed close to the bent portion of the heating wire, and the first and second adhesive layers are adhered and fixed together.

[0018] In practical applications, the first and second adhesive layers exhibit excellent adhesion, allowing for more reliable fixation of the bent portion of the heating wire. Furthermore, since neither the first nor second fixing layer is integrally fixed to the fabric layer, the structure's degree of freedom of movement allows sufficient space for stress release at the bent portion of the heating wire when the blanket folds or the heating wire coils, reducing adhesive loss under continuous stress and further ensuring the reliability of the fixation. Simultaneously, the entire structure is fixed without sewing, offering significant advantages in terms of manufacturing complexity.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a cross-sectional view of the fixing structure of the bent portion of the heating wire of the electric blanket described in this embodiment; Figure 2 This is a schematic diagram of the structure of the electric blanket described in this embodiment.

[0022] The attached diagram is labeled as follows: 1 is the first fixing layer, 2 is the second fixing layer, 3 is the bending part of the heating wire, 4 is the fabric layer; 11 is the first support layer, 12 is the first adhesive layer, 21 is the second support layer, 22 is the second adhesive layer, and 41 is the quilted tube. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0024] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] The current manufacturing process for electric blankets in the market involves: first, quilted channels are sewn into the fabric layer that makes up the blanket body; then, heating wires are threaded into these channels in an S-shape. The quilted channels prevent the heating wires from shifting, curling, or tangling within them, thus securing the heating wires. Simultaneously, the bends in the heating wires created by the S-shaped arrangement also need to be secured. Existing technologies include the following various solutions for securing the bends in the heating wires: Option 1: First, sew a strip of non-woven fabric to the fabric layer at both ends of the quilted tube. Second, thread the heating wire through the bend in the quilted tube and place it on the non-woven fabric. Finally, attach a strip of adhesive tape to the bend of the heating wire, securing it between the non-woven fabric and the tape. Alternatively, directly attach adhesive tape to the fabric layer to secure the bend of the heating wire. In this option, because the non-woven fabric or fabric layer itself is not adhesive, the fixing between the heating wire and the non-woven fabric or fabric layer relies solely on the adhesion of the top adhesive tape. After repeated washing and agitation, the adhesive tape's stickiness will weaken, and the heating wire will easily loosen. This means that when the electric blanket is washed and dried multiple times, the bend may separate from the adhesive tape, causing unpredictable displacement of the heating wire bend (such as the heating wire curling), leading to abnormal heating and significantly affecting the user experience. In extreme cases, this could even cause burns or fabric fires.

[0026] Option 2: Sew the bent part of the heating wire between two pieces of non-woven fabric, and then sew the non-woven fabric onto the main fabric layer to fix the bent part of the heating wire. However, this process is more complicated and the cost is too high.

[0027] It is evident that both current heating wire bending section fixing structures have significant drawbacks. Therefore, this embodiment aims to provide a new fixing structure for the bending section of the heating wire in an electric blanket to simultaneously address issues related to fixing reliability and manufacturing costs.

[0028] The following describes in more detail the fixing structure of the bent portion of the heating wire of the electric blanket disclosed in this utility model, with reference to the embodiments shown in the accompanying drawings.

[0029] Combination Figures 1 to 2 As shown, the fixing structure includes a first fixing layer 1 and a second fixing layer 2. Specifically, the first fixing layer 1 includes a first surface support layer 11 and a first adhesive layer 12 coated on either side thereof. The second fixing layer 2 includes a second surface support layer 21 and a second adhesive layer 22 coated on either side thereof.

[0030] To improve adhesion by increasing the contact area during subsequent fixing of the bending portion 3 of the heating wire, both the first support layer 11 and the second support layer 21 are flexible structures. Specifically, in this embodiment, both the first support layer 11 and the second support layer 21 are non-woven fabrics. Considering the washing and drying scenarios of the electric blanket, the corresponding first adhesive layer 12 and second adhesive layer 22 need to have water-resistant and dry-resistant properties. Therefore, in this embodiment, the first adhesive layer 12 and the second adhesive layer 22 can be TPU hot melt adhesive, PES hot melt adhesive, or PA hot melt adhesive. Specifically, this embodiment uses water-based polyurethane in TPU hot melt adhesive. Based on the characteristics and structural types or product types of the components in the first fixing layer 1 and the second fixing layer 2, in this embodiment, both the first fixing layer 1 and the second fixing layer 2 are adhesive-backed non-woven fabrics.

[0031] In specific implementation, it includes two sets of first fixing layers 1 and second fixing layers 2; they correspond to the heating wire bending portions 3 formed on both sides when the heating wire is bent back and forth. From the perspective of improving fixing reliability, as a preferred embodiment, the width of the first fixing layer 1 and the second fixing layer 2 is not less than the minimum width of the corresponding side heating wire bending portion 3.

[0032] The process of fixing the bending part 3 of the heating wire based on the above structural design is as follows: First, select a section of adhesive-backed non-woven fabric (i.e., the first fixing layer 1), place it with the adhesive side facing up (i.e., the first adhesive layer 12 facing up) at both ends of the quilted tube (without sewing). Then, thread the heating wire through the quilted tube and attach the bending part 3 of the heating wire to the first adhesive layer 12. Next, cut another section of adhesive-backed non-woven fabric (i.e., the second fixing layer 2), align it with the first fixing layer 1, and attach it with the second adhesive layer 22 facing down. Then, attach the bending part 3 of the heating wire between the two fixing layers. At this time, because the first adhesive layer 12 and the second adhesive layer 22 have good adhesion, the bending part 3 of the heating wire can be fixed more reliably. Furthermore, since the first fixing layer 1 or the second fixing layer 2 is not integrally fixed to the fabric layer 4, the aforementioned structural design, which allows for a certain degree of freedom of movement, enables the bending portion 3 of the heating wire to have sufficient space to release stress when the electric blanket is folded or the heating wire is coiled. This reduces the adhesive loss of the bending portion 3 of the heating wire under continuous stress, thereby further ensuring the reliability of fixing the bending portion 3 of the heating wire. At the same time, the entire structure is not fixed by sewing, thus having a significant advantage in terms of process complexity.

[0033] As an optional implementation, the length of the first fixing layer 1 is less than the length of the second fixing layer 2. When the first fixing layer 1 and the second fixing layer 2 are glued together, there are gaps on both sides of the second fixing layer 1. The second adhesive layer 22 with the gaps on both sides is glued to the fabric layer 4 opposite to it. Based on this fixing structure, in specific implementation, first take a piece of adhesive-backed non-woven fabric (i.e., the first fixing layer 1), place the first adhesive layer 12 facing upwards at both ends of the quilted tube (without sewing); then pass the heating wire out of the quilted tube, attach the bent part 3 of the heating wire to the first fixing layer 1, then cut a piece of adhesive-backed non-woven fabric (i.e., the second fixing layer 2) longer than the first fixing layer 1, align it with the first fixing layer 1 and glue it, attach the bent part 3 of the heating wire between the two fixing layers; finally, attach the excess part of the second fixing layer 2 to the fabric layer, which serves to fix the heating wire fixing part to the fabric layer.

[0034] As an alternative implementation, when the first fixing layer 1 and the second fixing layer 2 are bonded together, their common ends are sewn to any adjacent fabric layer. In practice, firstly, a section of adhesive-backed nonwoven fabric (i.e., the first fixing layer 1) is selected, and the first adhesive layer 12 is placed upwards at both ends of the quilted tube (without sewing). Then, the heating wire is threaded through the quilted tube, and the bent portion 3 of the heating wire is attached to the first adhesive layer 12. Next, another section of adhesive-backed nonwoven fabric (i.e., the second fixing layer 2) is cut, aligned with the first fixing layer 1, and the second adhesive layer 22 is attached with the adhesive side down. The bent portion 3 of the heating wire is then attached between the two fixing layers. Finally, the excess portions at both ends are sewn to the fabric layer 4. In this alternative solution, since only the two sides are fixed, the relatively flexible structural design allows sufficient space for stress release in the originally curved heating wire.

[0035] This embodiment also provides an electric blanket, which includes a fabric layer 4 and a plurality of quilted channels 41 quilted at intervals on the fabric layer 4. In this case, heating wires are repeatedly threaded through each quilted channel 41, and the resulting heating wire bends 3 are fixed using the aforementioned fixing structure. Therefore, the electric blanket has the advantages of simple processing and low cost during manufacturing, and in subsequent use, it has the advantages of high reliability in fixing the heating wire bends 3 and high safety in use.

[0036] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A fixing structure for the bent portion of the heating wire in an electric blanket, characterized in that, include: First fixed layer and second fixed layer; The first fixing layer includes a first surface support layer and a first adhesive layer coated on either side thereof; the second fixing layer includes a second surface support layer and a second adhesive layer coated on either side thereof. Both the first and second support layers are flexible structures, and the bent portion of the heating wire is placed between the first and second fixing layers; wherein, both the first and second adhesive layers are located close to the bent portion of the heating wire, and the first and second adhesive layers are bonded and fixed together.

2. The electric blanket heating wire bending portion fixing structure according to claim 1, characterized in that, The length of the first fixing layer is less than the length of the second fixing layer; When the first fixing layer and the second fixing layer are glued together, there are gaps on both sides of the second fixing layer; the second adhesive layer with the gaps on both sides is glued to the fabric layer opposite to it.

3. The electric blanket heating wire bending portion fixing structure according to claim 1, characterized in that, When the first fixing layer and the second fixing layer are glued together, their common ends are sewn together to any adjacent fabric layer.

4. The electric blanket heating wire bending portion fixing structure according to claim 1, characterized in that, Both the first adhesive layer and the second adhesive layer are TPU hot melt adhesive, PES hot melt adhesive or PA hot melt adhesive.

5. The fixing structure for the bent portion of the heating wire in the electric blanket according to claim 1, characterized in that, Both the first and second support layers are non-woven fabrics.

6. The electric blanket heating wire bending portion fixing structure according to claim 1, characterized by Both the first fixing layer and the second fixing layer are adhesive-backed nonwoven fabrics.

7. The electric blanket heating wire bending portion fixing structure according to claim 1, characterized by It includes two sets of first fixing layers and second fixing layers; corresponding to the bending portions of the heating wire formed on both sides when the heating wire is bent back and forth.

8. The fixing structure for the bent portion of the heating wire in an electric blanket according to claim 7, characterized in that, The widths of both the first fixing layer and the second fixing layer are not less than the minimum width of the corresponding side heating wire bend.

9. An electric blanket, characterized in that, Includes the fixing structure described in any one of claims 1 to 8.

10. The electric blanket of claim 9, wherein, It includes a fabric layer, on which a plurality of quilted channels are spaced apart; heating wires are repeatedly threaded through each quilted channel.

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