CN215835579U

CN215835579U - Electric heating tube

Info

Publication number: CN215835579U
Application number: CN202121687874.0U
Authority: CN
Inventors: 不公告发明人
Original assignee: Sanhua Aweco Appliance Systems Wuhu Co Ltd
Current assignee: Sanhua Aweco Appliance Systems Wuhu Co Ltd
Priority date: 2021-04-02
Filing date: 2021-07-23
Publication date: 2022-02-15
Anticipated expiration: 2031-07-23

Abstract

The utility model relates to the field of electric heating, and discloses an electric heating pipe aiming at the problem that the connection part of a fuse and a contact pin in the electric heating pipe is damaged due to extrusion deformation of fillers. By disposing a portion of the fuse assembly within the protective sheath, the fuse assembly body portion is prevented from contacting the filler, which can prevent the fuse assembly from being deformed by the filler during assembly and use.

Description

Electric heating tube

Technical Field

The utility model relates to the field of electric heating, in particular to an electric heating pipe.

Background

A heating wire and a fuse component are arranged in an electric heating tube, the heating wire is connected with the fuse component, and the fuse component is blown to break a circuit when the fuse component overflows. In addition, in order to ensure the utilization rate of heat energy, a filler (such as magnesium oxide) with good thermal conductivity and insulation is usually filled in the electric heating tube. Since the fuse assembly includes the contact pin and the fuse, the structure of the portion where the fuse and the contact pin are connected is fragile, and in the assembling or using process of the electric heating tube, it is necessary to pay attention to the fact that the portion where the fuse and the contact pin are connected is damaged due to the extrusion deformation of the filler.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the connection part of the fuse and the contact pin in the electric heating pipe is damaged due to extrusion deformation of the filler, the electric heating pipe is provided, and the following technical scheme is adopted:

an electric heating pipe comprises a pipe body, a heating wire, a fuse component and a protective sleeve, wherein the heating wire and the protective sleeve are arranged in the pipe body, at least part of the fuse component is located in the protective sleeve, the fuse component comprises a first fuse rod, a second fuse rod and a thermal fuse, the second fuse rod is electrically connected with the heating wire, and at least part of the thermal fuse is located in the protective sleeve; the protective sheath includes a first end, a body portion and a second end, the body portion being located between the first end and the second end; the connecting part of the thermal fuse and the second leading rod is positioned in the body part; the second end portion is provided with a limiting hole, one part of the second leading rod penetrates through the limiting hole, the second leading rod is fixed with the inner wall corresponding to the limiting hole in a sealing mode, and at least part of the peripheral wall portion of the second end portion is in interference fit with the inner wall portion of the pipe body.

Wherein, set up protective sheath protection fuse subassembly additional and can effectively prevent that fuse subassembly from receiving the influence of filler or other external force and deforming damage. In addition, after heater strip, fuse subassembly, protective sheath and filler loading advance the body, generally all compress the body again with the draw machine, clearance fit between the inner wall that the stick and spacing hole correspond is drawn to the second before the compression, the second of being convenient for is drawn the stick and is run through spacing hole, the inner wall shrink that spacing hole corresponds after the compression, it is fixed that closely laminating between the inner wall that the stick and spacing hole correspond is drawn to the second, also sealed fixed, can also prevent simultaneously that the filler from entering into in the protective sheath from spacing hole. The interference fit of the outer peripheral wall portion of the second end portion with the inner wall portion of the tube body can confine the filler to a specific region within the tube body.

The second tip still is equipped with the recess, the opening orientation of recess the heater strip with the position that the stick electricity is connected is drawn to the second, spacing hole runs through the bottom that the recess corresponds, the recess is in the second is drawn the cross section of stick's axial direction and is circular.

The first end part comprises a front end part and a base part, the front end part is of a circular truncated cone-shaped structure, a large-diameter end of the front end part is connected with one end of the base part, the other end of the base part is connected with one end of the body part, and the outer peripheral wall part of the base part is in interference fit with the inner wall part of the pipe body;

the end surface areas of the base part and the second end part are both larger than the end surface area of the body part, and the thermal fuse is at least partially positioned in the body part.

The first end part further comprises a through hole penetrating through the front end part and the base part, the body part is provided with a through channel, the through channel is communicated with the through hole and the limiting hole, one part of the first guide rod is positioned in the through hole, and the first guide rod is fixed with the front end part.

The first guide rod is provided with a first connecting part and a second connecting part, one end of the first connecting part is connected with the second connecting part, and the other end of the first connecting part is connected with the thermal fuse;

the second guide rod is provided with a third connecting portion and a fourth connecting portion, one end of the third connecting portion is connected with the fourth connecting portion, and the other end of the third connecting portion is connected with the thermal fuse.

The first connecting part is provided with a first fixing groove, and one end of the thermal fuse extends into the first fixing groove and is fixed with the first fixing groove; the third connecting portion has a second fixing groove, and the other end of the thermal fuse extends into the second fixing groove and is fixed to the second fixing groove.

The side face of the second connecting portion is provided with an extruding portion, the diameter of the second connecting portion is slightly smaller than the inner diameter of the limiting hole, and the maximum diameter of the extruding portion is larger than the inner diameter of the limiting hole.

The area of any end face of the third connecting portion is larger than that of the end face of the limiting hole, and the area of any end face of the fourth connecting portion is smaller than that of the end face of the limiting hole.

The fourth connecting part comprises a wiring part and a fixing part, and the fixing part penetrates through the limiting hole. The pipe body is provided with two ports, and the ports are provided with sealing ceramics and metal insertion pieces connected with fuse components or heating wires in the pipe body.

The tube body is also filled with a filler, and the second end portion separates the filler from the body portion.

Through set up the protective sheath in the body, fuse subassembly's partly setting can prevent fuse subassembly main part and filler contact in the protective sheath, like this, in assembly and use, can prevent that fuse subassembly from receiving the filler extrusion and warping.

Drawings

FIG. 1 is a schematic view of a protective sheath covering a fuse assembly;

FIG. 2 is a schematic view of a protective sheath;

FIG. 3 is a schematic structural view of a fuse assembly;

FIG. 4 is a schematic view of the protective sheath and fuse assembly within the body;

fig. 5 is a schematic structural view of an electric heating tube.

Reference numerals:

the device comprises a pipe body 1, a heating wire 2, a fuse component 3 and a protective sleeve 4; a filler 5;

a port 11, sealing ceramic 12 and a metal insert 13;

a first lead bar 31, a second lead bar 32, a thermal fuse 33;

a first connection part 311, a second connection part 312, a first fixing groove 313, a pressing part 314;

a third connection part 321, a fourth connection part 322, a second fixing groove 323, a wire connection part 324, a fixing part 325;

a first end 41, a body 42, a second end 43;

a tip portion 411, a base portion 412, a through hole 413;

a through channel 421;

groove 431 and limiting hole 432.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in figures 1-5 of the drawings,

an electric heating tube comprises a tube body 1, a heating wire 2, a fuse component 3 and a protective sleeve 4; the heating wire 2 and the protective sleeve 4 are arranged in the pipe body 1, and at least part of the fuse component is positioned in the protective sleeve; the fuse assembly 3 comprises a first fuse rod 31, a second fuse rod 32 and a thermal fuse 33, the second fuse rod 32 being electrically connected to the heating filament 2, the thermal fuse 33 being at least partially located within the protective sheath 4.

Wherein, the tube body 1 of the electric heating tube is filled with filler 5. The filler adopts magnesium oxide powder. The tube body 1 has two ports 11, and there are seal ceramic 12 and the metal inserted sheet 13 of being connected with fuse subassembly 3 in the tube body 1 at one end of tube body 1, have seal ceramic 12 and the metal inserted sheet 13 of being connected with the one end of heater strip 2 in the tube body 1 at the other end of tube body 1. After the metal insert 13 is directly or indirectly connected to the fuse assembly 3, the port 11 is sealed by the sealing ceramic 12. The protective sleeve 4 is sleeved outside the fuse component 3 and plays a role in protecting the fuse component 3.

The protective sheath 4 comprises a first end 41, a body 42 and a second end 43, the body 42 being located between the first end 41 and the second end 43; the connecting portion of the thermal fuse 33 and the second lead bar 32 is located in the body portion; the thermal fuse 33 is at least partially located within the body portion.

The first end portion 41 includes a front end portion 411 and a base portion 412, the end surface areas of the base portion 411 and the second end portion 43 are both larger than the end surface area of the body portion 42, and the thermal fuse 33 is at least partially located in the body portion. The front end 411 is connected to the base 412; the first end portion 41 further includes a through hole 413 passing through the front end portion 411 and the base portion 412, a part of the first guide rod 31 is located in the through hole 413, and the first guide rod 31 is fixed to the front end portion 411.

When the fuse element 3 is installed in the protective sheath 4, a part of the fuse element 3 passes through the first end portion 41, the body portion 42 and the second end portion 43, and a part of the fuse element is exposed to the protective sheath 4. In this embodiment, in order to fix the fuse assembly 3 and the protective sheath 4, and also in order to prevent the filler 5 in the tube 1 from entering the protective sheath 4 and affecting the fuse assembly 3, the end of the through hole 413 is sealed; in addition, the front end 411 is a circular truncated cone-shaped structure, the large diameter end of the front end 411 is connected with the base part 412, and the other end of the front end 411 is connected with one end of the main body part 42, so that the amount of sealing compound can be increased (if the front end is a cylindrical structure, the amount of sealing compound which can be used on the flat end surface is relatively small), the strength of the sealing compound is increased, and the sealing treatment effect is better.

The body portion 42 may be cylindrical and has a through passage 421 penetrating the upper and lower bottom surfaces, and the through passage 421 is communicated with the through hole 413 and the stopper hole 432. The fuse assembly 3 enters from the through hole, passes through the through channel 421 and the limiting hole 413, and a part of the first guiding rod 31 is located in the through hole 413.

The second end 43 is provided with a groove 431 and a limiting hole 432, the opening of the groove faces the position where the heating wire is electrically connected with the second leading rod 32, the limiting hole 432 penetrates through the bottom corresponding to the groove 431, the cross section of the groove in the radial direction of the second leading rod 32 is circular, and the purpose of the circular shape is that the stress of the second end is uniform when the pipe body is compressed by the pipe reducing machine, and the generation of a gap between the groove and the magnesium oxide powder is reduced. The groove 431 is designed so that the magnesium oxide powder in the pipe body 1 is sufficiently filled in the groove 431 when the protective sleeve is inserted into the pipe body 1. The groove 431 is designed to fully fill the filler 5 in the pipe body 1 into the groove 431 when the protective sleeve 4 is plugged into the pipe body 1, so that an end face gap is prevented from occurring when the pipe body is compressed by a pipe reducing machine, arc discharge (also called gap discharge) is not generated, high-voltage breakdown is prevented, and electrical performance is ensured. One end (i.e. the second leading rod 32) of the fuse component 3 passes through the limiting hole 432, and the limiting hole 432 has a certain limiting effect on the fuse component 3. In addition, after the body compressed via the draw machine, the inner wall that corresponds with spacing hole in the recess is drawn excellent 32 with the second and is closely laminated, has effectively prevented that the magnesia powder from entering into the protective sheath from spacing hole to influence fuse subassembly 3.

In addition, a first step portion is formed at a portion where the first end portion 41 is connected to the main body portion 42, and in the present embodiment, the diameter of the base portion 412 is larger than that of the main body portion 42. The second end 43 is connected with the body 42 to form a second step, in this embodiment, the diameter of the connection between the second end 43 and the body 42 is larger than the diameter of the body 42, that is, the two ends of the protection sleeve 4 are large in size, the base 412 of the first end 41 and at least part of the outer peripheral wall of the second end 43 are in interference fit with the inner wall of the tube, and the body is small in size, so that the protection sleeve 4 does not shake when the tube 1 is rolled, and the body 42 of the protection sleeve 4 is not stressed, thereby protecting the fuse assembly 3 inside from being damaged by external force. Moreover, the interference fit of the second end portion 41 with the tube body 1 and the combination of the groove 431 not only separate the filler 5 from the body portion 42, but also effectively limit the filler 5 to a specific area within the tube body.

The fuse assembly 3 is provided with a first fuse rod 31, a second fuse rod 32 and a thermal fuse 33, and two ends of the thermal fuse 33 are respectively and fixedly connected with the second fuse rod 32 and the first fuse rod 31.

The first guiding rod 31 is provided with a first connecting portion 311 and a second connecting portion 312, one end of the first connecting portion 311 is connected to the second connecting portion 312, and the other end of the first connecting portion 311 is connected to the thermal fuse 33, in this embodiment, the first connecting portion 311 has a first fixing groove 313, and one end of the thermal fuse 33 extends into the first fixing groove 313 and is fixed to the first fixing groove 313. The second guiding rod 32 is provided with a third connecting portion 321 and a fourth connecting portion 322, one end of the third connecting portion 321 is fixedly connected to the fourth connecting portion 322, and the other end of the third connecting portion 321 is connected to the thermal fuse 33, in this embodiment, the third connecting portion 321 has a second fixing groove 323, and the other end of the thermal fuse 33 extends into the second fixing groove 323 and is fixed to the second fixing groove 323.

The first connecting portion 311 is a cylinder, and the diameter of the first connecting portion is slightly smaller than the inner diameter of the through hole 413, so that when the sealing process is performed, the first connecting portion can isolate the thermal fuse 33 from the sealing compound to a certain extent, and the sealing compound is prevented from affecting the thermal fuse. The two legs of the thermal fuse 33 are fixedly connected to the first connecting portion 311 and the third connecting portion 321 by being pressed outside the first connecting portion 311 and the third connecting portion 321. The fixing mode is convenient for production and manufacturing convenience and high efficiency, and meanwhile, the connection stability can be guaranteed.

The side surface of the second connecting part 312 is provided with a pressing part 314, the diameter of the second connecting part 312 is slightly smaller than the inner diameter of the limiting hole 432, and the maximum diameter of the pressing part 314 is larger than the inner diameter of the limiting hole 432. The pressing portion 314 may be formed by pressing the second connection portion 312. When the sealing glue is used for sealing the end part of the front end part 411, the extrusion part is wrapped and fixed together by the sealing glue, and the shape of the extrusion part increases the torsion, so that the fuse assembly is effectively prevented from rotating, and the service life is prolonged.

Any end surface area of the third connecting portion 321 is larger than that of the limiting hole 432, and any end surface area of the fourth connecting portion 322 is smaller than that of the limiting hole 432. The fourth connecting portion 322 is designed to pass through the limiting hole 432, and the third connecting portion 321 cannot pass through the limiting hole 432, so as to limit the fuse assembly 3.

The fourth connection portion 322 includes a wire connection portion 324 and a fixing portion 325, the fixing portion passes through the limiting hole 432, and the wire connection portion is connected to the heating wire 2. In this embodiment, the fixing portion 325 is a cylinder, and the diameter thereof is slightly smaller than the diameter of the limiting hole 432, so that after the tube body 1 is compressed by the tube shrinking machine, the diameter of the limiting hole 432 is simultaneously shrunk and tightly attached to the fixing portion 325, thereby effectively preventing the possibility that the filler magnesium oxide powder enters the protective sleeve 4 from the limiting hole.

Claims

1. An electric heating pipe comprises a pipe body (1), a heating wire (2) and a fuse assembly (3), and is characterized by further comprising a protective sleeve (4), wherein the heating wire and the protective sleeve are arranged in the pipe body, at least part of the fuse assembly is positioned in the protective sleeve, the fuse assembly comprises a first leading rod (31), a second leading rod (32) and a thermal fuse (33), the second leading rod is electrically connected with the heating wire, at least part of the thermal fuse is positioned in the protective sleeve, the protective sleeve comprises a first end part (41), a body part (42) and a second end part (43), the body part is positioned between the first end part and the second end part, the connecting part of the thermal fuse and the second leading rod is positioned in the body part, the second end part is provided with a limiting hole (432), and part of the second leading rod penetrates through the limiting hole, and the second guide rod is fixed with the inner wall corresponding to the limiting hole in a sealing way, and at least part of the peripheral wall part of the second end part is in interference fit with the inner wall part of the pipe body.

2. An electric heating tube according to claim 1, characterized in that the second end portion (43) is further provided with a groove (431) which opens towards the location where the heating wire (2) is electrically connected to the second guiding rod (32), the limiting hole (432) penetrates through the corresponding bottom of the groove, and the cross section of the groove in the radial direction of the second guiding rod is circular.

3. An electric heating tube according to claim 1, characterized in that said first end portion (41) comprises a front end portion (411) and a base portion (412), said front end portion is of a circular truncated cone structure, said front end portion has a large diameter end connected to one end of said base portion, said base portion has another end connected to one end of said body portion (42), and an outer peripheral wall portion of said base portion is in interference fit with an inner wall portion of said tube body (1);

the base portion and the second end portion (43) each have an end surface area greater than the body portion and the thermal fuse (33) is at least partially located within the body portion.

4. An electric heating tube according to claim 3, characterized in that said first end portion (41) further comprises a through hole (413) extending through said front end portion and said base portion, said body portion (42) is provided with a through channel (421) communicating said through hole (413) with said limiting hole (432), a portion of said first guiding rod (31) is located in said through hole, and said first guiding rod is fixed with said front end portion (411).

5. An electric heating tube according to claim 4, characterized in that the first lead bar (31) is provided with a first connection portion (311) and a second connection portion (312), the first connection portion being connected at one end to the second connection portion and at the other end to the thermal fuse (33);

the second guide rod (32) is provided with a third connecting portion (321) and a fourth connecting portion (322), one end of the third connecting portion is connected with the fourth connecting portion, and the other end of the third connecting portion is connected with the thermal fuse (33).

6. An electric heating tube according to claim 5, wherein the first connection portion (311) has a first fixing groove (313), into which one end of the thermal fuse (33) is inserted and fixed with the first fixing groove; the third connecting portion (321) has a second fixing groove (323), and the other end of the thermal fuse extends into the second fixing groove and is fixed to the second fixing groove.

7. An electric heating pipe according to claim 6, characterized in that a pressing portion (314) is provided on a side surface of the second connecting portion (312), the diameter of the second connecting portion is slightly smaller than the inner diameter of the limiting hole (432), and the maximum diameter of the pressing portion is larger than the inner diameter of the limiting hole.

8. An electric heating tube according to claim 6, characterized in that any end surface area of the third connecting portion (321) is larger than that of the limiting hole (432), and any end surface area of the fourth connecting portion (322) is smaller than that of the limiting hole (432).

9. An electric heating tube according to claim 6, characterized in that the fourth connection portion (322) comprises a wire connection portion (324) and a fixing portion (325), the fixing portion passing through a limiting hole (432).

10. An electric heating tube according to any one of claims 1-9, characterized in that the tube body (1) has two ports (11) provided with sealing ceramics (12) and metal inserts (13) connected to the fuse assembly (3) or the heating wire (2) inside the tube body (1).

11. An electric heating tube according to claim 1, characterized in that the tube body (1) is further filled with a filler (5), and the second end portion separates the filler from the body portion (42).