Small-diameter heating pipe

Abstract

The utility model discloses a small-diameter heating pipe, which comprises a support cylinder, a heating film structure and a heating shell, the heating film structure wraps the outer side of the support cylinder, and the support cylinder wrapped with the heating film structure is inserted into the inner side of the heating shell; the heating film structure is attached to the inner wall of the heating shell under the support of the support cylinder; the heating film structure wraps the outer side of the supporting cylinder, the supporting cylinder wrapped with the heating film structure is inserted into the inner side of the heating shell, the heating film structure is tightly attached to the inner wall of the heating shell under the supporting of the supporting cylinder, the heating film structure is prevented from being separated from the inner wall of the heating shell in the heating process, and the heating efficiency is improved; and uniform heating can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric heating tube, concretely to a small diameter heating tube. BACKGROUND

[0002] Electric heating tube is a kind of electric appliance element that converts electric energy into heat energy. It is with metal tube as shell (including stainless steel, purple copper pipe), along the center axis of pipe even distribution spiral electric heating alloy wire (nickel-chromium, iron-chromium alloy) its interstice fills compacted magnesium oxide sand with good insulating and heat conducting performance, pipe mouth both ends are sealed with silica gel, this metal armoring electric heating element can heat air, metal mould and various liquids;

[0003] The existing electric heating tube is deformed when using, the heating film cannot be closely combined with the inner wall of the heating tube, so the heating efficiency is affected, and therefore the small diameter heating tube is provided. UTILITY MODEL CONTENTS

[0004] The utility model discloses a small diameter heating tube to solve the problems in the prior art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a small diameter heating tube, including support cylinder, heating film structure and heating shell, the heating film structure is wrapped in the support cylinder outside, and the support cylinder wrapped with heating film structure is inserted in the heating shell inside.

[0006] The heating film structure is attached to the inner wall of the heating shell under the support of the support cylinder.

[0007] Among them, the heating film structure and the support cylinder are provided with heat insulation mica paper layer.

[0008] Among them, the heat insulation mica paper layer includes inner layer mica paper and outer layer mica paper arranged from inside to outside, a first slot is formed in the inner layer mica paper on one side along the axial direction, a second slot is formed in the outer layer mica paper on one side along the axial direction, and the first slot in the inner layer mica paper and the second slot in the outer layer mica paper are arranged in dislocation.

[0009] Compared with the prior art, the utility model has the beneficial effects that:

[0010] The heating film structure is wrapped in the support cylinder outside, the support cylinder wrapped with heating film structure is inserted in the heating shell inside, and the heating film structure is closely attached to the inner wall of the heating shell under the support of the support cylinder, so that the heating film structure is prevented from separating from the inner wall of the heating shell during heating, the heating efficiency is improved, and uniform heating can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1The whole shaft measurement structure schematic diagram of the heating pipe of the utility model;

[0012] Figure 2 The explosion structure schematic diagram of the heating pipe of the utility model;

[0013] Figure 3 The shaft measurement structure schematic diagram of the heating film structure of the utility model;

[0014] Figure 4 The shaft measurement structure schematic diagram of the support plate of the utility model; Figure 3 The enlarged structure schematic diagram of A part of the utility model;

[0015] Figure 5 The explosion structure schematic diagram of the heat insulation mica paper layer of the utility model;

[0016] Figure 6 The shaft measurement structure schematic diagram of the support cylinder of the utility model;

[0017] Figure 7 The explosion structure schematic diagram of the support cylinder of the utility model;

[0018] Figure 8 The internal structure schematic diagram of the support cylinder of the utility model;

[0019] Figure 9 The shaft measurement structure schematic diagram of the support plate of the utility model;

[0020] Figure 10 The explosion structure schematic diagram of the support plate of the utility model.

[0021] In the drawing: 10, support cylinder; 11, support plate; 12, wedge-shaped limiting block; 13, positioning spring; 14, positioning ball; 15, plug-in hole; 16, plug-in column; 20, heat insulation mica paper layer; 21, inner layer mica paper; 22, outer layer mica paper; 30, heating film structure; 31, heating film body; 32, electrode; 33, upper U-shaped part; 34, lower U-shaped part; 40, heating shell. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0023] Please refer to Figures 1-10 The utility model provides a technical scheme:

[0024] The small-diameter heating pipe comprises a supporting cylinder 10, a heating film structure 30 and a heating shell 40, the heating film structure 30 is wrapped outside the supporting cylinder 10, and the supporting cylinder 10 wrapped with the heating film structure 30 is inserted inside the heating shell 40; the heating film structure 30 is attached to the inner wall of the heating shell 40 under the support of the supporting cylinder 10; the heating film structure 30 is wrapped outside the supporting cylinder 10, the supporting cylinder 10 wrapped with the heating film structure 30 is inserted inside the heating shell 40, and the heating film structure 30 is tightly attached to the inner wall of the heating shell 40 under the support of the supporting cylinder 10, so that the heating film structure 30 is prevented from separating from the inner wall of the heating shell 40 during heating, the heating efficiency is improved, and uniform heating can be achieved.

[0025] The heating shell 40 is in a cylindrical structure, and the heating shell 40 is made of quartz or ceramic; the quartz or ceramic can improve the insulation performance of the heating shell 40 and effectively enhance the corrosion resistance and adaptability of the heating shell 40 in special environments.

[0026] The traditional heating pipe has an unremovable gap between the heating wire and the heating outer tube during work, which leads to insufficient heat transfer and low heating efficiency. The supporting cylinder 10 supports the heating film structure 30, so that the heating film structure 30 is tightly attached to the inner wall of the heating shell 40, greatly reducing the heat transfer resistance and significantly improving the heat transfer efficiency, so that the heating shell 40 can be quickly and uniformly heated.

[0027] The heating film structure 30 and the supporting cylinder 10 are provided with a heat insulation mica paper layer 20, and the supporting cylinder 10 is wrapped by the heat insulation mica paper layer 20, so that heat is prevented from being transferred to the supporting cylinder 10 when the heating film structure 30 works.

[0028] The heat insulation mica paper layer 20 comprises an inner layer mica paper 21 and an outer layer mica paper 22 arranged from inside to outside, a first slot is formed in the inner layer mica paper 21 along the axial direction, a second slot is formed in the outer layer mica paper 22 along the axial direction, the first slot in the inner layer mica paper 21 and the second slot in the outer layer mica paper 22 are arranged in a staggered manner, the inner layer mica paper 21 and the outer layer mica paper 22 are combined into the heat insulation mica paper layer 20, and the first slot in the inner layer mica paper 21 and the second slot in the outer layer mica paper 22 are arranged in a staggered manner. When the supporting cylinder 10 expands to support the heating film structure 30, the inner layer mica paper 21 and the outer layer mica paper 22 also expand, the first slot and the second slot are arranged in a staggered manner, so that the inner layer mica paper 21 and the outer layer mica paper 22 do not form gaps during expansion (to avoid gaps in the heat insulation mica paper layer 20 on the surface of the supporting cylinder 10), thereby achieving good heat insulation effect.

[0029] The support cylinder 10 comprises three support plates 11 which are uniformly distributed along the circumference, the cross section of the support plate 11 is arc-shaped structure, the three support plates 11 are enclosed into a circular cavity, the circular cavity is provided with a positioning spring 13 in the axial direction, the both ends of the positioning spring 13 are provided with a positioning ball 14, the both ends of the inner wall of the support plate 11 are provided with a wedge-shaped limiting block 12 matched with the positioning ball 14, in the specific use, the three support plates 11 are enclosed together, the positioning spring 13 is placed between the three support plates 11, and one positioning ball 14 is placed at the both ends of the positioning spring 13, then the two staggered inner layer mica paper 21 and outer layer mica paper 22 are wrapped outside the three support plates 11, then the heating film body 31 is wrapped outside the heat insulation mica paper layer 20, then the support rod (not shown in the drawing, as long as the rod with a diameter smaller than the inner diameter of the circular cavity and a larger hardness can be used) is used to extrude the positioning spring 13 from both ends (the positioning spring 13 is extruded by the positioning ball 14), so that the positioning spring 13 is contracted, the positioning ball 14 is prevented from contacting the wedge-shaped limiting block 12, the cross section size of the support cylinder 10 enclosed by the three support plates 11 is minimized, then the support cylinder 10 wrapped with the heating film structure 30 is inserted into the heating shell 40, after the position of the support cylinder 10 is adjusted, the support rod extruding the positioning spring 13 at both ends is removed, then the positioning spring 13 is reset without external force, the positioning ball 14 at both ends is moved to both ends inside the three support plates 11 by the positioning spring 13, then the positioning ball 14 moves along the wedge-shaped limiting block 12, the three support plates 11 are expanded by the cooperation of the positioning ball 14 and the wedge-shaped limiting block 12, the cross section size of the support cylinder 10 is increased, the heating film structure is tightly attached to the inner wall of the heating shell 40 by the support cylinder 10, when the heating film structure 30 needs to be replaced, the positioning ball 14 and the positioning spring 13 are extruded from both ends by the support rod, so that the positioning ball 14 moves inward, in the process that the positioning ball 14 moves inward along the wedge-shaped limiting block 12, the cross section size of the three support plates 11 can be reduced, so that the support cylinder 10 can be pulled out from the heating shell 40, thereby the new heating film structure 30 is replaced.

[0030] Further, the cross section size of the support cylinder 10 enclosed by the three support plates 11 is smaller than the internal size of the heating shell 40, so that the enclosed support cylinder 10 can be inserted into the heating shell 40.

[0031] When the positioning spring 13 is extruded, in order to ensure that the support cylinder 10 can be inserted into the heating shell 40, one of the support rods passes through the heating shell 40, and then the positioning spring 13 is extruded inward by the two support rods (two workers are needed to cooperate).

[0032] The thickness of the wedge-shaped limiting block 12 gradually increases from inside to outside, and an inclined arc-shaped sliding groove is arranged on the surface of the wedge-shaped limiting block 12, so as to facilitate the movement of the positioning ball 14 along the arc-shaped sliding groove. When the positioning ball 14 moves from inside to outside along the wedge-shaped limiting block 12, the supporting diameter of the supporting cylinder 10 also increases. When the positioning ball 14 moves from outside to inside along the wedge-shaped limiting block 12, the supporting diameter of the supporting cylinder 10 also decreases.

[0033] The back surface of the wedge-shaped limiting block 12 is provided with two insertion columns 16, and the two ends of the supporting plate 11 are provided with insertion holes 15 matched with the insertion columns 16. The wedge-shaped limiting block 12 is installed on the inner side of the supporting plate 11 through the cooperation of the insertion columns 16 and the insertion holes 15.

[0034] The heating film structure 30 includes a heating film body 31, and the two ends of the heating film body 31 are provided with electrodes 32. In assembly, the heating film body 31 and the electrodes 32 are wrapped on the surface of the supporting cylinder 10 of the cylinder, and then the supporting cylinder 10 wrapped with the heating film body 31 is inserted into the heating shell 40. The supporting cylinder 10 supports the heating film body 31, so that the heating film body 31 is tightly attached to the inner wall of the heating shell 40. The electrodes 32 are used for electrically connecting with an external power supply.

[0035] The heating film body 31 includes upper U-shaped parts 33 and lower U-shaped parts 34 arranged at equal intervals along the axial direction. The upper U-shaped parts 33 and the lower U-shaped parts 34 are arranged at intervals, and adjacent upper U-shaped parts 33 and lower U-shaped parts 34 are connected end to end. The heating film body 31 includes upper U-shaped parts 33 and lower U-shaped parts 34 arranged at equal intervals along the axial direction. The upper U-shaped parts 33 and the lower U-shaped parts 34 are arranged at intervals, and adjacent upper U-shaped parts 33 and lower U-shaped parts 34 are connected end to end. The heating film body 31 is composed of a plurality of groups of upper U-shaped parts 33 and lower U-shaped parts 34 connected end to end. The curved upper U-shaped parts 33 and the lower U-shaped parts 34 can be combined into a heating film body 31 with one side open. The heating film body 31 can be wrapped on the supporting cylinder 10 of the cylinder, and the supporting cylinder 10 supports the heating film body 31, so that the heating film body 31 is tightly attached to the inner wall of the heating shell 40. This can effectively reduce the current dead angle, promote uniform heating temperature distribution, and ensure the uniformity of thermal expansion deformation. On the other hand, it can significantly reduce the radial displacement caused by thermal expansion, so that the tubular heating film has radial freedom while meeting the strict requirements of size stability and heating performance in actual application.

[0036] The upper U-shaped parts 33 and the lower U-shaped parts 34 are both curved, and the bending radius of the upper U-shaped parts 33 is the same as the bending radius of the lower U-shaped parts 34, so that the heating film body 31 can be wrapped on the supporting cylinder 10 of the cylinder.

[0037] The heating film body 31 is made of 316 stainless steel material; the heating film body 31 is of an integral structure; specifically, a round pipe (thin wall) made of 316 stainless steel is selected, and then cut according to the shape of the heating film body 31 of the application, so that the integral heating film body 31 is formed after cutting, the thickness of different parts of the heating film body 31 is uniform, the spacing distance between the upper U-shaped part 33 and the lower U-shaped part 34 is uniform, the bending amplitude is uniform, the current dead angle can be effectively reduced, and the heating temperature distribution is uniform.

[0038] Further, the round pipe (thin wall) made of 316 stainless steel is selected, and then cut according to the shape of the heating film body 31 of the application, so that the upper U-shaped part 33 and the lower U-shaped part 34 are arranged at intervals, the adjacent upper U-shaped part 33 and lower U-shaped part 34 are connected at the head and tail, the heating film body 31 is composed of a plurality of groups of upper U-shaped parts 33 and lower U-shaped parts 34 adjacent at the head and tail, the curved upper U-shaped part 33 and lower U-shaped part 34 can be combined into a heating film body 31 with one side open, the heating film body 31 can be wrapped on the cylindrical support cylinder 10, and the support cylinder 10 supports the heating film body 31, so that the heating film body 31 is tightly attached to the inner wall of the heating shell 40, the current dead angle can be effectively reduced, the heating temperature distribution is uniform, and the uniformity of thermal expansion deformation is ensured.

[0039] Working principle: in use, the three support plates 11 are enclosed together, the positioning spring 13 is placed between the three support plates 11, one positioning ball 14 is placed at both ends of the positioning spring 13, then the two staggered inner and outer mica paper layers 21 and 22 are wrapped outside the three support plates 11, then the heating film body 31 is wrapped outside the heat insulation mica paper layer 20, then one support rod is inserted into the heating shell 40, and then the positioning balls 14 are pressed inward by the two support rods, so that the positioning spring 13 is pressed and shrunk, the positioning balls 14 are prevented from contacting the wedge-shaped limiting blocks 12, the cross-sectional size of the support cylinder 10 enclosed by the three support plates 11 is minimized, then the support cylinder 10 wrapped with the heating film structure 30 is inserted into the heating shell 40, the position of the support cylinder 10 is adjusted, then the support rods pressing the positioning spring 13 at both ends are removed, the positioning spring 13 is reset without external force, the positioning balls 14 at both ends are moved to the ends inside the three support plates 11, then the positioning balls 14 move along the wedge-shaped limiting blocks 12, the three support plates 11 are expanded by the cooperation of the positioning balls 14 and the wedge-shaped limiting blocks 12, the cross-sectional size of the support cylinder 10 is increased, and the heating film structure is tightly attached to the inner wall of the heating shell 40 by the support cylinder 10.

[0040] The basic principle, main features and advantages of the present application are shown and described above. The present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A small diameter heating tube comprising a support cylinder (10), a heating film structure (30) and a heating housing (40), characterized in that: The heating film structure (30) is wrapped outside the supporting cylinder (10), and the supporting cylinder (10) wrapped with the heating film structure (30) is inserted inside the heating shell (40). The heating film structure (30) is attached to the inner wall of the heating shell (40) under the support of the supporting cylinder (10).

2. A small diameter heating tube according to claim 1, characterized in that: A heat insulation mica paper layer (20) is arranged between the heating film structure (30) and the supporting cylinder (10).

3. A small diameter heating tube according to claim 2, wherein: The heat insulation mica paper layer (20) comprises an inner layer mica paper (21) and an outer layer mica paper (22) arranged from inside to outside, a first strip-shaped groove is formed on one side of the inner layer mica paper (21) in the axial direction, a second strip-shaped groove is formed on one side of the outer layer mica paper (22) in the axial direction, and the first strip-shaped groove on the inner layer mica paper (21) is arranged in a staggered manner with the second strip-shaped groove on the outer layer mica paper (22).

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