Direct-current PTC (Positive Temperature Coefficient) melt colloid

Abstract

The utility model relates to a direct-current PTC (Positive Temperature Coefficient) melt adhesive body, which comprises a metal inner sleeve, an arc-shaped PTC electric heating element and a metal outer sleeve, the metal inner sleeve is provided with a tubular melt adhesive part, and the arc-shaped PTC electric heating element is attached to the outer side surface of the tubular melt adhesive part. And the metal jacket is provided with an elastic locking plate which is used for pressing the arc-shaped PTC electric heating element on the outer side surface of the tubular glue melting part. The DC PTC melt adhesive body is simple in structure and convenient to assemble, the PTC electric heating element is in ideal contact with the tubular melt adhesive part of the metal inner sleeve, and the heat conduction efficiency is high.

Description

Technical Field

[0001] This application relates to the technical field of components of hot melt glue guns, and particularly to a DC PTC melt body. Background Art

[0002] A hot melt glue gun is a common hot melt extrusion glue device, which is widely used in the fields of electronic appliances, construction, decoration, etc. The melt body is an important part of the hot melt glue gun. The melt body is installed at the muzzle of the hot melt glue gun and is used to heat and melt the solid glue stick.

[0003] Common melt bodies include an aluminum cast inner tube, an electric heating element arranged on the outer side of the aluminum cast inner tube, and an insulating isolation film wound around the outer side of the electric heating element and used to press the electric heating element against the outer surface of the aluminum cast inner tube. The aluminum cast inner tube has a glue melting channel for the glue to flow through, and the electric heating element heats the glue in the glue melting channel through heat conduction. Since the insulating isolation film is used to fix the electric heating element on the outer side of the aluminum cast inner tube, the assembly of the above melt body is relatively cumbersome. Utility Model Content

[0004] This application provides a DC PTC melt body, and the structure of the DC PTC melt body is simple and the assembly is convenient.

[0005] A DC PTC melt body provided by this application adopts the following technical solutions:

[0006] A DC PTC melt body includes a metal inner sleeve, an arc-shaped PTC electric heating element, and a metal outer sleeve. The metal inner sleeve has a tubular glue melting part. The arc-shaped PTC electric heating element is attached to the outer surface of the tubular glue melting part. The metal outer sleeve has an elastic locking piece for pressing the arc-shaped PTC electric heating element against the outer surface of the tubular glue melting part.

[0007] By adopting the above technical solutions, the above DC PTC melt body designs the traditional sleeve-shaped PTC electric heating element into an arc-shaped PTC electric heating element, and the elastic locking piece of the metal outer sleeve presses the arc-shaped PTC electric heating element against the outer surface of the tubular glue melting part, making the structure of the above DC PTC melt body simple and the assembly convenient. Moreover, there is no gap between the arc-shaped PTC electric heating element and the tubular glue melting part, making the heat transfer efficiency between the arc-shaped PTC electric heating element and the metal inner sleeve relatively ideal.

[0008] Optionally, the number of the arc-shaped PTC electric heating elements is not less than two and they are circumferentially arranged at intervals on the outer surface of the tubular glue melting part.

[0009] By adopting the above technical solutions, the limitation of the number of the arc-shaped PTC electric heating elements and the limitation of the arrangement method make the heating of the tubular glue melting part of the metal inner sleeve by the arc-shaped PTC electric heating elements relatively ideal.

[0010] Optionally, the metal outer sleeve has partition ribs disposed between adjacent arc-shaped PTC heating elements, and there is a safety gap between the partition ribs and the outer surface of the metal inner sleeve.

[0011] By adopting the above technical solution, the partition ribs can separate adjacent arc-shaped PTC heating elements, which helps to keep a reasonable distance between adjacent arc-shaped PTC heating elements. There is a safety gap between the partition ribs of the metal outer sleeve and the metal inner sleeve, which helps to avoid short circuit between the metal outer sleeve and the metal inner sleeve.

[0012] Optionally, the partition ribs are formed by inwards concave folding of the side wall of the metal outer sleeve.

[0013] By adopting the above technical solution, the forming method of the partition ribs of the metal outer sleeve is disclosed, and this forming method is relatively convenient.

[0014] Optionally, the inner arc surface of the arc-shaped PTC heating element is provided with grid-shaped convex lines.

[0015] By adopting the above technical solution, the heating area at the inner arc surface of the arc-shaped PTC heating element is increased, which helps to improve the heating effect of the arc-shaped PTC heating element on the metal inner sleeve, and also increases the friction coefficient of the inner arc surface of the arc-shaped PTC heating element, reducing the probability of the arc-shaped PTC heating element moving when it is attached to the outer surface of the tubular glue melting part.

[0016] Optionally, the metal outer sleeve is a tubular metal outer sleeve or a C-shaped metal outer sleeve.

[0017] Optionally, the metal inner sleeve further includes a tubular connection part, a conical limiting part, a conical glue guiding part and a glue outlet pipe, and the tubular connection part, the conical limiting part, the tubular glue melting part, the conical glue guiding part and the glue outlet pipe are connected in sequence; the metal inner sleeve has a glue outlet channel, and a glue outlet is formed at the end of the glue outlet pipe; the bottom end of the arc-shaped PTC heating element abuts against the conical limiting part.

[0018] Optionally, the metal inner sleeve further includes a tubular connection part, a conical glue guiding part and a glue outlet pipe; the tubular connection part, the tubular glue melting part, the conical glue guiding part and the glue outlet pipe are connected in sequence; the metal inner sleeve has a glue outlet channel, and a glue outlet is formed at the end of the glue outlet pipe; a ring-shaped limiting rib for the bottom end of the arc-shaped PTC heating element to abut against is provided at one end of the tubular connection part close to the tubular glue melting part.

[0019] Optionally, the metal inner sleeve further includes a tubular connecting portion and a conical glue guiding portion; the tubular connecting portion, the tubular glue melting portion, and the conical glue guiding portion are connected in sequence; the metal inner sleeve has a glue outlet channel, and a glue outlet is formed at the end of the conical glue guiding portion of the glue outlet channel; a ring-shaped limiting rib for the bottom end of the arc-shaped PTC heating element to abut against is provided at one end of the tubular connecting portion close to the tubular glue melting portion.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. A DC PTC melting body, by providing an arc-shaped PTC heating element attached to the outer surface of the tubular glue melting portion of the metal inner sleeve, and providing an elastic locking piece for pressing the arc-shaped PTC heating element against the outer surface of the tubular glue melting portion, makes the above-mentioned DC PTC melting body have a simple structure, convenient assembly, and improves the contact effect between the PTC heating element and the tubular glue melting portion of the metal inner sleeve, which helps to make the heat transfer efficiency between the arc-shaped PTC heating element and the metal inner sleeve relatively ideal;

[0022] 2. By providing isolation ribs on the metal outer sleeve, the arc-shaped PTC heating elements can be isolated from each other, which helps the arc-shaped PTC heating elements to be evenly arranged on the outer surface of the tubular glue melting portion of the metal inner sleeve;

[0023] 3. By providing grid-shaped convex patterns on the inner surface of the arc-shaped heating element, it helps to improve the heating effect of the arc-shaped PTC heating element on the metal inner sleeve, and also reduces the probability of the arc-shaped PTC heating element moving around. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the DC PTC melting body in Embodiment 1.

[0025] Figure 2 is a schematic cross-sectional view of the metal inner sleeve in Embodiment 1.

[0026] Figure 3 is a schematic structural diagram of the arc-shaped PTC heating element in Embodiment 1.

[0027] Figure 4 is a top view of the DC PTC melting body in Embodiment 1.

[0028] Figure 5 is a schematic cross-sectional view of the DC PTC melting body in Embodiment 2.

[0029] Figure 6 is a schematic cross-sectional view of the DC PTC melting body in Embodiment 3.

[0030] Figure 7It is a schematic structural diagram of the DC PTC melt colloid in Embodiment 4.

[0031] Figure 8 It is a top view of the DC PTC melt colloid in Embodiment 4.

[0032] Explanation of reference numerals: 1. Metal inner sleeve; 11. Tubular connecting part; 111. Limiting rib; 12. Conical limiting part; 13. Tubular glue melting part; 14. Conical glue guiding part; 15. Glue outlet tube; 16. Glue outlet chamber; 161. Installation opening; 162. Glue outlet; 163. Glue melting chamber; 164. Glue guiding chamber; 165. Glue outlet channel; 2. Arc-shaped PTC heating element; 21. Mesh-like convex pattern; 22. Arrangement gap; 3. Metal outer sleeve; 31. Locking window; 32. Elastic locking piece; 33. Isolation rib; 34. Safety gap; 35. Crack. Detailed implementation manners

[0033] The following further elaborates on this application Figure 1-8 in conjunction with the accompanying drawings.

[0034] The embodiment of this application discloses a DC PTC melt colloid.

[0035] Embodiment 1

[0036] Referring to Figure 1 , the DC PTC melt colloid includes a metal inner sleeve 1, an arc-shaped PTC heating element 2, and a metal outer sleeve 3.

[0037] Referring to Figure 1 and Figure 2 , the metal inner sleeve 1 sequentially includes a coaxially arranged tubular connecting part 11, a conical limiting part 12, a tubular glue melting part 13, a conical glue guiding part 14, and a glue outlet tube 15 along the glue outlet direction of the glue. The tubular connecting part 11 is used for sleeving on other components of the hot melt glue gun. The conical limiting part 12 is in the shape of a hollow frustum, and the outer diameter of the conical limiting part 12 gradually decreases along the direction from the tubular connecting part 11 to the tubular glue melting part 13. The tubular glue melting part 13 is in a circular tube shape. The outer diameter of the conical glue guiding part 14 gradually decreases along the direction from the tubular glue melting part 13 to the glue outlet tube 15. The glue outlet tube 15 is a circular tube structure.

[0038] Referring to Figure 1 and Figure 2, the metal inner sleeve 1 is a sleeve structure with a uniform wall thickness and has a glue outlet chamber 16 for allowing glue to pass through. In this embodiment, the metal inner sleeve 1 is a copper sheath with a thickness of 0.1 mm. The glue outlet chamber 16 forms an installation opening 161 for inserting a solid glue stick at the tubular connection part 11, and forms a glue outlet 162 for allowing the molten glue to flow out at the end of the glue outlet tube 15. Among them, the glue outlet chamber 16 includes a melting glue chamber 163 corresponding to the tubular glue melting part 13, a glue guiding chamber 164 corresponding to the conical glue guiding part 14, and a glue outlet channel 165 corresponding to the glue outlet tube 15. Among them, the aperture of the glue outlet 162 is smaller than the aperture of the glue outlet channel 165, that is, the glue outlet tube 15 is provided with a flanging structure that turns inward at the port. The solid glue stick is inserted into the metal inner sleeve 1 through the installation opening 161, and after being melted in the melting glue chamber 163, it is extruded from the glue outlet 162.

[0039] Referring to Figure 1 and Figure 3 , the arc-shaped PTC heating element 2 is an arc-shaped sheet structure. The inner arc surface of the arc-shaped PTC heating element 2 is adapted to the outer surface of the tubular glue melting part 13, and a grid-like convex pattern 21 is arranged on the inner arc surface of the arc-shaped PTC heating element 2.

[0040] Referring to Figure 1 and Figure 4 , the number of arc-shaped PTC heating elements 2 is not less than two, and they are circumferentially and evenly arranged on the outer surface of the tubular glue melting part 13. In this embodiment, the number of arc-shaped PTC heating elements 2 is two petals, and the two petals of arc-shaped PTC heating elements 2 are symmetrically arranged, and an arrangement gap 22 is formed between the two arc-shaped PTC heating elements 2.

[0041] Referring to Figure 1 , when the arc-shaped PTC heating element 2 is arranged on the outer surface of the tubular glue melting part 13, the bottom end of the arc-shaped PTC heating element 2 abuts against the conical limiting part 12.

[0042] Referring to Figure 1 , the metal outer sleeve 3 is arranged on the outside of the arc-shaped PTC heating element 2, and the length of the arc-shaped PTC heating element 2 is greater than the length of the metal outer sleeve 3, so that both ends of the arc-shaped PTC heating element 2 are exposed outside the metal outer sleeve 3. In this embodiment, the metal outer sleeve 3 is a tubular metal outer sleeve.

[0043] Referring to Figure 1 , the metal outer sleeve 3 is circumferentially and symmetrically provided with locking windows 31 and elastic lock pieces 32 are arranged at the lower edge of the locking windows 31. The elastic lock pieces 32 are arranged in one-to-one correspondence with the arc-shaped PTC heating elements 2. The elastic lock pieces 32 abut against the outer surface of the arc-shaped PTC heating element 2 and drive the arc-shaped PTC heating element 2 to always have a tendency to fit against the outer surface of the tubular glue melting part 13.

[0044] Referring to Figure 1 and Figure 4 Figure 4 , in order to separate the adjacent arc-shaped PTC heating elements 2 to assist in the circumferential uniform distribution of the adjacent arc-shaped PTC heating elements 2 on the outer surface of the tubular glue melting part 13, the metal outer sleeve 3 has a partition rib 33 that can be arranged in the arrangement gap 22. There is a safety gap 34 between the partition rib 33 and the outer surface of the metal inner sleeve 1. In this embodiment, the partition rib 33 is formed by inwardly folding the side wall of the metal inner sleeve 1.

[0045] Combined with Figures 1 to 4 Figures 1 to 4 , the implementation principle of a DC PTC glue body in an embodiment of the present application is as follows: both the metal outer sleeve 3 and the metal inner sleeve 1 of the DC PTC glue body are connected to a DC circuit system, so that direct current can pass through the arc-shaped PTC heating element 2. The arc-shaped PTC heating element 2 generates heat after passing through direct current, and the generated heat will heat the solid glue rod in the metal inner sleeve 1, causing the solid glue rod to melt, and the molten glue flows out from the glue outlet 162 under extrusion.

[0046] Embodiment 2

[0047] For the DC PTC glue body in this embodiment and Embodiment 1, except that the structure of the metal inner sleeve 1 is inconsistent, the other structures are the same as those in Embodiment 1.

[0048] Referring to Figure 5 Figure 5 , the metal inner sleeve 1 sequentially includes a tubular connection part 11, a tubular glue melting part 13, a conical glue guiding part 14, and a glue outlet pipe 15 along the glue outlet direction of the glue. The tubular connection part 11 is in a circular tube shape and is used for being inserted on other components of the glue gun. The conical glue guiding part 14 is in a hollow frustum shape, and the outer diameter of the conical glue guiding part 14 gradually decreases along the direction from the tubular glue melting part 13 to the glue outlet pipe 15. The glue outlet pipe 15 is in a circular tube structure.

[0049] Referring to Figure 5 Figure 5 , the metal inner sleeve 1 is a sleeve structure with a uniform wall thickness and has a glue outlet chamber 16 for the glue to pass through. The glue outlet chamber 16 is formed with an installation opening 161 for arranging the solid glue rod at the tubular connection part 11, and a glue outlet 162 for glue outlet is formed at the end of the glue outlet pipe 15. Among them, the glue outlet chamber 16 includes a glue melting chamber 163 corresponding to the tubular glue melting part 13, a glue guiding chamber 164 corresponding to the conical glue guiding part 14, and a glue outlet channel 165 corresponding to the glue outlet pipe 15. The solid glue rod is inserted into the metal inner sleeve 1 through the installation opening 161, and after being melted in the glue melting chamber, it is extruded from the glue outlet 162.

[0050] Referring to Figure 5, a limiting rib 111 in a ring shape is provided at one end of the tubular connecting portion 11 close to the tubular glue melting portion 13. When the arc-shaped PTC heating element 2 is arranged on the outer surface of the tubular glue melting portion 13, the arc-shaped PTC heating element 2 abuts against the limiting rib 111. Among them, the limiting rib 111 is formed by protruding outward from the side wall of the metal outer sleeve 3.

[0051] Embodiment 3

[0052] For the DC PTC glue melt body in this embodiment and Embodiment 2, except that the metal inner sleeve 11 is not provided with a glue outlet pipe 15, the rest of the structures are the same as those in Embodiment 2.

[0053] Refer to Figure 6 , the metal inner sleeve 1 sequentially includes a tubular connecting portion 11, a tubular glue melting portion 13, and a conical glue guiding portion 14 along the glue outlet direction. The metal inner sleeve 1 is a sleeve structure with a uniform wall thickness and has a glue outlet chamber 16 for the glue to pass through. The glue outlet chamber 16 forms an installation opening 161 for arranging a solid glue stick at the tubular connecting portion 11, and a glue outlet 162 for glue outlet is formed at the end of the conical glue guiding portion 14. Among them, the glue outlet chamber 16 includes a glue melting chamber corresponding to the cylindrical installation portion and a glue guiding chamber 164 corresponding to the conical glue guiding portion 14.

[0054] Embodiment 4

[0055] For the DC PTC glue melt body in this embodiment and Embodiment 1, except that the structure of the metal outer sleeve 3 is inconsistent, the rest of the structures are the same as those in Embodiment 1.

[0056] Refer to Figure 7 and Figure 8 , the metal outer sleeve 3 in this embodiment is a C-shaped metal outer sleeve. The metal outer sleeve 3 has a crack 35 connecting the upper and lower edges of the metal outer sleeve 3. The crack 35 is a strip-shaped crack and is parallel to the axis direction of the metal outer sleeve 3. The metal outer sleeve 3 is symmetrically provided with locking windows 31 and elastic lock pieces 32 are arranged at the lower edge of the locking windows 31. The number of the locking windows 31 corresponds to the arc-shaped PTC heating elements 2 one by one. The elastic lock pieces 32 abut against the outer surface of the arc-shaped PTC heating elements 2 and drive the arc-shaped PTC heating elements 2 to always have a tendency to fit against the outer surface of the tubular glue melting portion 13. The metal outer sleeve 3 has a partition rib 33 corresponding to the crack 35, and the partition rib 33 is arranged in the arrangement gap 22 between two arc-shaped PTC heating elements 2. Among them, the partition rib 33 is formed by inwardly folding the side wall of the metal outer sleeve 3.

[0057] The above are all the preferred embodiments of this application. The protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A DC PTC melt colloid, characterized in that, It includes a metal inner sleeve (1), an arc-shaped PTC heating element (2) and a metal outer sleeve (3). The metal inner sleeve (1) has a tubular glue melting part (13). The arc-shaped PTC heating element (2) is attached to the outer surface of the tubular glue melting part (13). The metal outer sleeve (3) has an elastic locking piece (32) that presses the arc-shaped PTC heating element (2) against the outer surface of the tubular glue melting part (13); The metal outer sleeve (3) has a partition rib (33) arranged between adjacent arc-shaped PTC heating elements (2). There is a safety gap (34) between the partition rib (33) and the outer surface of the metal inner sleeve (1); The partition rib (33) is formed by inwardly folding the side wall of the metal outer sleeve (3); The inner arc surface of the arc-shaped PTC heating element (2) is provided with grid-shaped convex lines (21).

2. The direct current PTC fuse body according to claim 1, wherein The number of the arc-shaped PTC heating elements (2) is not less than two and they are circumferentially arranged at intervals on the outer surface of the tubular glue melting part (13).

3. A DC PTC fuse colloid according to claim 1, characterized in that The metal outer sleeve (3) is a tubular metal outer sleeve or a C-shaped metal outer sleeve.

4. A DC PTC melt body according to claim 1, characterized in that, The metal inner sleeve (1) further includes a tubular connecting part (11), a conical limiting part (12), a conical glue guiding part (14) and a glue outlet pipe (15). The tubular connecting part (11), the conical limiting part (12), the tubular glue melting part (13), the conical glue guiding part (14) and the glue outlet pipe (15) are connected in sequence. The metal inner sleeve (1) has a glue outlet channel (165). A glue outlet (162) is formed at the end of the glue outlet pipe (15). The bottom end of the arc-shaped PTC heating element (2) abuts against the conical limiting part (12).

5. A DC PTC melt body according to claim 1, characterized in that, The metal inner sleeve (1) further includes a tubular connecting part (11), a conical glue guiding part (14) and a glue outlet pipe (15). The tubular connecting part (11), the tubular glue melting part (13), the conical glue guiding part (14) and the glue outlet pipe (15) are connected in sequence. The metal inner sleeve (1) has a glue outlet channel (165). A glue outlet (162) is formed at the end of the glue outlet pipe (15). The tubular connecting part (11) is provided with an annular limiting rib (111) for the bottom end of the arc-shaped PTC heating element (2) to abut against at one end close to the tubular glue melting part (13).

6. A DC PTC fuse colloid according to claim 1, characterized in that, The metal inner sleeve (1) further includes a tubular connecting part (11) and a conical glue guiding part (14). The tubular connecting part (11), the tubular glue melting part (13), the conical glue guiding part (14) are connected in sequence. The metal inner sleeve (1) has a glue outlet channel (165). A glue outlet (162) is formed at the end of the conical glue guiding part (14). The tubular connecting part (11) is provided with an annular limiting rib (111) for the bottom end of the arc-shaped PTC heating element (2) to abut against at one end close to the tubular glue melting part (13).

Images