Industrial electric heating tube

Abstract

The invention relates to the technical field of electric heating, and provides an industrial electric heating tube which comprises a tube body provided with a heating assembly and a temperature sensing assembly, an inner cavity used for containing and installing the heating assembly and the temperature sensing assembly is formed in the tube body, and the temperature measuring end of the temperature sensing assembly is located in the middle of the interior of the tube body. And / or the temperature measuring end of the temperature sensing assembly is located at the middle position of the heating assembly; a positioning ring connected with the temperature measuring end of the temperature sensing assembly is arranged in the middle of the heating assembly, the temperature sensing assembly is fixed to the middle of the heating assembly through the positioning ring, and in the electric heating process of the industrial electric heating pipe, the temperature measuring end of the temperature sensing assembly measures the temperature of the middle of the heating section of the industrial electric heating pipe. The positioning ring connected with the temperature measuring end of the temperature sensing assembly is arranged on the outer side of the heating assembly, so that the temperature measuring end of the temperature sensing assembly is arranged in the middle of the heating assembly, and the temperature measuring of the temperature sensing line is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating, and in particular to an industrial electric heating pipe. Background Art

[0002] The temperature measuring end of the existing industrial electric heating pipe is usually set at the head or tail of the industrial electric heating pipe, and the middle position of the industrial electric heating pipe has the highest heating temperature. Therefore, when the temperature measuring end of the temperature sensing wire is set at the head or tail of the industrial electric heating pipe, the temperature of the industrial electric heating pipe measured by the temperature sensing wire is inaccurate.

[0003] Therefore, further improvement is needed. Summary of the invention

[0004] The present invention provides an industrial electric heating pipe. A positioning ring connected to a temperature measuring end of a temperature sensing assembly is provided on the outside of the heating assembly, so that the temperature measuring end of the temperature sensing assembly is arranged in the middle of the heating assembly, and the temperature sensing line measures temperature more accurately.

[0005] An industrial electric heating tube designed for this purpose comprises a tube body provided with a heating assembly and a temperature sensing assembly, the tube body is provided with an inner cavity for accommodating and installing the heating assembly and the temperature sensing assembly, the temperature measuring end of the temperature sensing assembly is located at the middle position inside the tube body, and / or the temperature measuring end of the temperature sensing assembly is located at the middle position of the heating assembly; A positioning ring connected to the temperature measuring end of the temperature sensing assembly is provided in the middle position of the heating assembly. The temperature sensing assembly is fixed in the middle position of the heating assembly through the positioning ring. During the electric heating process of the industrial electric heating pipe, the temperature measuring end of the temperature sensing assembly measures the temperature of the middle position of the heating section of the industrial electric heating pipe.

[0006] The positioning ring is a conductive material. The temperature sensing assembly temperature measuring end includes a positive temperature measuring end and a negative temperature measuring end. The positive temperature measuring end and the negative temperature measuring end are respectively connected to the positioning ring. The positive temperature measuring end and the negative temperature measuring end form a conductive connection through the positioning ring.

[0007] The temperature sensing assembly includes a positive temperature sensing line and a negative temperature sensing line, the end of the positive temperature sensing line is connected to the positioning ring, the end of the negative temperature sensing line is connected to the positioning ring, the end of the positive temperature sensing line forms a positive temperature measuring end, and the end of the negative temperature sensing line forms a negative temperature measuring end; An insulating member is arranged on the positioning ring, and a through hole for passing the conductive member is arranged on the insulating member. The positioning ring is sleeved on the outside of the insulating member, and the positive temperature measuring end and the negative temperature measuring end are separated from the conductive member by the insulating member.

[0008] A first notch is provided at the insulating part corresponding to the positive temperature measuring end, and a second notch is provided at the insulating part corresponding to the negative temperature measuring end; when the positive temperature measuring end is connected to the positioning ring, the positive temperature measuring end is partially limited between the first notch and the inner side of the positioning ring, and when the negative temperature measuring end is connected to the positioning ring, the negative temperature measuring end is partially limited between the second notch and the inner side of the positioning ring.

[0009] The heating assembly includes a core rod that is arranged in a split manner, and the core rod includes a first core rod and a second core rod. The tube bodies of the first core rod and the second core rod are equal in length, and a positioning ring is arranged between the first core rod and the second core rod; the first core rod and the second core rod clamp the positioning ring up and down so that the temperature sensing assembly connected to the positioning ring is in the middle position of the heating assembly.

[0010] The heating assembly includes a first temperature-sensing wire plug-in cavity for inserting the positive temperature-sensing wire on the first core rod, and a second temperature-sensing wire plug-in cavity for inserting the negative temperature-sensing wire on the first core rod; the first temperature-sensing wire plug-in cavity is connected to the first notch, and the second temperature-sensing wire plug-in cavity is connected to the second notch.

[0011] The first core rod and the second core rod are both provided with a first conductive plug-in cavity and a second conductive plug-in cavity; The insulating member is provided with a first via hole and a second via hole; the first via hole is connected to the first conductive plug cavity, and the second via hole is connected to the second conductive plug cavity; The conductive member includes a first conductive member inserted into the first conductive plug-in cavity and the first via hole, and a second conductive member inserted into the second conductive plug-in cavity and the second via hole.

[0012] The first core rod and the second core rod are both provided with heating wires, and a conductive connection is formed between the heating wires and the conductive member; The first conductive member and the second conductive member passing through the end of the second core rod are both provided with a first insulating sleeve.

[0013] The first mandrel is provided with a first avoidance lower notch and a first avoidance upper notch, the first avoidance lower notch is connected to the second conductive plug-in cavity of the first mandrel, the first avoidance upper notch is connected to the first conductive plug-in cavity of the first mandrel, the second mandrel is provided with a second avoidance upper notch and a second avoidance lower notch, the second avoidance upper notch is connected to the first conductive plug-in cavity of the second mandrel, and the second avoidance lower notch is connected to the second conductive plug-in cavity of the second mandrel; The heating wire comprises a first heating wire wound on the outer side of the first core rod, and a second heating wire wound on the outer side of the second core rod; The first end portion of the first heating wire wound on the outer side of the first core rod is inserted into the first conductive plug-in cavity of the first core rod through the first avoidance upper notch to form a first inner tube heating wire, and the first inner tube heating wire forms a conductive contact with the first conductive member; the end portion of the first heating wire wound on the outer side of the first core rod is inserted into the second conductive plug-in cavity of the first core rod through the first avoidance lower notch to form a second inner tube heating wire, and the second inner tube heating wire forms a conductive contact with the second conductive member; The head end portion of the second heating wire wound on the outer side of the second core rod is inserted into the first conductive plug-in cavity of the second core rod through the second avoidance upper notch to form a third inner tube heating wire, and the third inner tube heating wire forms a conductive contact with the first conductive member. The end portion of the second heating wire wound on the outer side of the second core rod is inserted into the second conductive plug-in cavity of the second core rod through the second avoidance lower notch to form a fourth inner tube heating wire, and the fourth inner tube heating wire forms a conductive contact with the second conductive member.

[0014] One end of the tube body is a sealed end, and the other end of the tube body is provided with a seal, and the seal is provided with a perforation corresponding to each temperature-sensitive wire and the conductive member, and the positive temperature-sensitive wire and the negative temperature-sensitive wire passing through the end of the second core rod are both provided with a second insulating sleeve; The inner cavity of the tube body is provided with magnesium oxide powder, which fills the gap between the core rod and the inner cavity of the tube body. The core rod and the temperature sensing assembly on the core rod are encapsulated in the inner cavity of the tube body through a seal, wherein a sealing structure is formed between the insulating sleeve and the corresponding perforation to prevent the magnesium oxide powder from leaking out of the inner cavity of the tube body.

[0015] The beneficial technical effects of the present invention are as follows: A positioning ring connected to the temperature measuring end of the temperature sensing assembly is provided on the outside of the heating assembly, so that the temperature measuring end of the temperature sensing assembly is set in the middle position of the heating assembly, and the temperature sensing line measures temperature more accurately. The heating assembly includes a first core rod and a second core rod that are set in sections. The positioning ring is installed between the first core rod and the second core rod. The positioning ring is clamped up and down between the first core rod and the second core rod. The positioning ring is installed between the first core rod and the second core rod without screws, and the temperature sensing line is welded and fixed to the positioning ring. On the one hand, the temperature measurement is more accurate, and on the other hand, it plays the role of fixing the temperature sensing line.

[0016] An insulating part for inserting the conductive part is provided on the positioning ring. The temperature sensing wire is separated from the conductive part by the insulating part to prevent the temperature sensing wire from contacting the conductive part and avoid the electric heating tube from not working properly.

[0017] The temperature-sensing wire and the conductive part passing through the end of the first core rod are both inserted into the corrugated tube. Since no barrier structure is arranged in the corrugated tube, the temperature-sensing wire and the conductive part passing through the end of the first core rod are both provided with insulating sleeves to prevent the temperature-sensing wire and the conductive part from forming conductive contact. Moreover, since the corrugated tube is made of metal, the insulating sleeve can also prevent the temperature-sensing wire and the conductive part from forming conductive contact with the inner wall of the corrugated tube respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 The figure is a schematic diagram of the three-dimensional structure of an industrial electric heating tube according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the outer tube heating wire winding arrangement according to an embodiment of the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0023] Figure 5 This is a schematic diagram of a three-dimensional structure in which a positioning ring is provided between the first core rod and the second core rod according to an embodiment of the present invention.

[0024] Figure 6 The figure is a schematic diagram of the assembly and decomposition structure of an industrial electric heating tube heating assembly according to an embodiment of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of a tube body according to an embodiment of the present invention.

[0026] Figure 8 It is a schematic diagram of the structure between the heating wire and the conductive member of the core rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] See also Figure 1-Figure 8 , an industrial electric heating pipe, comprising a pipe body 1 provided with a heating assembly 2 and a temperature sensing assembly 3, the pipe body 1 is provided with an inner cavity for accommodating and installing the heating assembly 2 and the temperature sensing assembly 3, the temperature measuring end of the temperature sensing assembly 3 is located at a middle position inside the pipe body 1, and / or the temperature measuring end of the temperature sensing assembly 3 is located at a middle position of the heating assembly 2; A positioning ring 4 connected to the temperature measuring end of the temperature sensing assembly 3 is provided in the middle position of the heating assembly 2. The temperature sensing assembly 3 is fixed in the middle position of the heating assembly 2 by the positioning ring 4. During the electric heating process of the industrial electric heating pipe, the temperature measuring end of the temperature sensing assembly 3 measures the temperature of the middle position of the heating section of the industrial electric heating pipe.

[0029] The positioning ring 4 is made of conductive material. The temperature measuring end of the temperature sensing assembly 3 includes a positive temperature measuring end 5 and a negative temperature measuring end 6. The positive temperature measuring end 5 and the negative temperature measuring end 6 are respectively connected to the positioning ring 4. The positive temperature measuring end 5 and the negative temperature measuring end 6 form a conductive connection through the positioning ring 4.

[0030] The temperature sensing assembly 3 includes a positive temperature sensing line 7 and a negative temperature sensing line 8. The end of the positive temperature sensing line 7 is connected to the positioning ring 4, and the end of the negative temperature sensing line 8 is connected to the positioning ring 4. The end of the positive temperature sensing line 7 forms a positive temperature measuring end 5, and the end of the negative temperature sensing line 8 forms a negative temperature measuring end 6. An insulating member 9 is provided on the positioning ring 4 , and a through hole for passing the conductive member is provided on the insulating member 9 . The positioning ring 4 is sleeved on the outside of the insulating member 9 , and the positive temperature measuring end 5 and the negative temperature measuring end 6 are separated from the conductive member by the insulating member 9 .

[0031] The insulating part 9 is provided with a first notch 12 corresponding to the positive temperature measuring end 5, and the insulating part 9 is provided with a second notch 13 corresponding to the negative temperature measuring end 6; when the positive temperature measuring end 5 is connected to the positioning ring 4, the positive temperature measuring end 5 is partially limited between the first notch 12 and the inner side of the positioning ring 4, and when the negative temperature measuring end 6 is connected to the positioning ring 4, the negative temperature measuring end 6 is partially limited between the second notch 13 and the inner side of the positioning ring 4.

[0032] In this embodiment, the positive temperature measuring end 5 and the negative temperature measuring end 6 can be conductively connected through the positioning ring 4, and then the resistance value of the temperature sensing wire is measured during the electric heating process of the electric heating tube.

[0033] In this embodiment, the temperature sensing wire temperature measurement principle is based on the fact that the resistance of the material changes with the temperature. When the temperature sensing wire contacts the measured object, it will be affected by the temperature of the object, thereby changing its resistance value. By measuring the resistance value of the temperature sensing wire, we can indirectly know the temperature of the measured object, so through heat transfer, the heating temperature of the industrial electric heating tube can be indirectly measured.

[0034] The working principle of the temperature sensing wire can be explained by Ohm's law and the thermoelectric effect. According to Ohm's law, the relationship between resistance and current and voltage is proportional. When the current through the temperature sensing wire remains unchanged, the resistance value of the temperature sensing wire will increase as the temperature increases; conversely, the decrease in temperature will cause the resistance value to decrease. In addition, the thermoelectric effect refers to the difference in thermoelectric potential generated in the material at different temperatures, which can be used to measure temperature.

[0035] Temperature sensing wires are usually made of conductive materials, commonly used materials include copper, nickel and platinum, which have good conductivity and stable resistance characteristics. Temperature sensing wires are composed of metal wires and insulating sleeves. The metal wires are very small in diameter and connected to the computer through circuits. When the temperature rises, the resistance of the wire will increase accordingly. The resistance signal is converted into a temperature signal through the circuit, so that the temperature can be measured.

[0036] In this embodiment, the positive temperature measuring end 5 and the negative temperature measuring end 6 are symmetrically fixed on the inner side of the positioning ring 4 .

[0037] In this embodiment, the insulating member 9 is made of ceramics, and the outer ring of the insulating member 9 is a ring-shaped structure with a gap, and the gap is used to avoid the connection between the temperature sensing line and the positioning ring.

[0038] The heating assembly 2 includes a core rod that is arranged in a split manner, and the core rod includes a first core rod 14 and a second core rod 15. The tube bodies of the first core rod 14 and the second core rod 15 are equal in length, and a positioning ring 4 is arranged between the first core rod 14 and the second core rod 15; the first core rod 14 and the second core rod 15 clamp the positioning ring 4 up and down so that the temperature sensing assembly 3 connected to the positioning ring 4 is in the middle position of the heating assembly 2.

[0039] The heating assembly 2 includes a first core rod 14 on which a first temperature sensing wire plug-in cavity 16 is provided for inserting the positive temperature sensing wire 7, and a second temperature sensing wire plug-in cavity 17 is provided for inserting the negative temperature sensing wire 8 on the first core rod 14; the first temperature sensing wire plug-in cavity 16 is connected to the first notch 12, and the second temperature sensing wire plug-in cavity 17 is connected to the second notch 13.

[0040] The first core rod 14 and the second core rod 15 are both provided with a first conductive plug-in cavity 18 and a second conductive plug-in cavity 19; The insulating member 9 is provided with a first through hole 10 and a second through hole 11; the first through hole 10 is connected to the first conductive plug cavity 18, and the second through hole 11 is connected to the second conductive plug cavity 19; The conductive member includes a first conductive member 20 inserted into the first conductive plug-in cavity 18 and the first via hole 10 , and a second conductive member 21 inserted into the second conductive plug-in cavity 19 and the second via hole 11 .

[0041] The first core rod 14 and the second core rod 15 are both provided with heating wires: the heating wires and the conductive member form a conductive connection; The first conductive member 20 and the second conductive member 21 passing through the end of the second core rod 15 are both provided with a first insulating sleeve.

[0042] The first core rod 14 is provided with a first avoidance lower notch 23 and a first avoidance upper notch 32, the first avoidance lower notch 23 is connected to the second conductive plug-in cavity 19 of the first core rod 14, the first avoidance upper notch 32 is connected to the first conductive plug-in cavity 18 of the first core rod 14, the second core rod 15 is provided with a second avoidance upper notch 24 and a second avoidance lower notch 31, the second avoidance upper notch 24 is connected to the first conductive plug-in cavity 18 of the second core rod 15, the second avoidance lower notch 31 is connected to the second conductive plug-in cavity 19 of the second core rod 15; The heating wire includes a first heating wire 34 wound on the outside of the first core rod 14 and a second heating wire 33 wound on the outside of the second core rod 15; The first end portion of the first heating wire 34 wound on the outside of the first core rod 14 is inserted into the first conductive plug-in cavity 18 of the first core rod 14 through the first avoidance upper notch 32 to form a first inner tube heating wire 28, and the first inner tube heating wire 28 forms a conductive contact with the first conductive member 20; the end portion of the first heating wire 34 wound on the outside of the first core rod 14 is inserted into the second conductive plug-in cavity 19 of the first core rod 14 through the first avoidance lower notch 23 to form a second inner tube heating wire 29, and the second inner tube heating wire 29 forms a conductive contact with the second conductive member 21; The head end portion of the second heating wire 33 wound on the outer side of the second core rod 15 is inserted into the first conductive plug-in cavity 18 of the second core rod 15 through the second avoidance upper notch 24 to form a third inner tube heating wire 35, and the third inner tube heating wire 35 forms a conductive contact with the first conductive member 20. The end portion of the second heating wire 33 wound on the outer side of the second core rod 15 is inserted into the second conductive plug-in cavity 19 of the second core rod 15 through the second avoidance lower notch 31 to form a fourth inner tube heating wire 36, and the fourth inner tube heating wire 36 forms a conductive contact with the second conductive member 21.

[0043] In this embodiment, the second avoidance lower notch 31 of the second core rod 15 is close to the top of the positioning ring 4. In order to prevent the fourth inner tube heating wire 36 from contacting the positioning ring 4, magnesium powder or ceramic parts are filled in the second avoidance lower notch 31 to prevent the fourth inner tube heating wire 36 from contacting the positioning ring 4.

[0044] In this embodiment, the first avoidance upper notch 32 is close to the bottom of the positioning ring 4. To prevent the first inner tube heating wire 28 from contacting the positioning ring 4, the first avoidance upper notch 32 is filled with magnesium powder or ceramic parts to prevent the first inner tube heating wire 28 from contacting the positioning ring 4.

[0045] One end of the tube body 1 is a sealed end, and the other end of the tube body 1 is provided with a seal 25. The seal 25 is provided with a perforation corresponding to each temperature-sensitive wire and the conductive member. The positive temperature-sensitive wire 7 and the negative temperature-sensitive wire 8 passing through the end of the second core rod 15 are both provided with a second insulating sleeve; The inner cavity of the tube body 1 is provided with magnesium oxide powder, and the magnesium oxide powder fills the gap between the core rod and the inner cavity of the tube body 1. The core rod and the temperature sensing assembly 3 located on the core rod are encapsulated in the inner cavity of the tube body 1 through a seal 25, wherein a sealing structure is formed between the insulating sleeve and the corresponding perforation to prevent the magnesium oxide powder from leaking out of the inner cavity of the tube body 1.

[0046] Alternatively, the heating wire wound and inserted on each core rod has a high tension and will not move on the core rod, thereby avoiding contact between the heating wire and the positioning ring 4.

[0047] In this embodiment, the heating wire wound around the outside of the first core rod 14 and the second core rod 15 forms an outer tube heating wire.

[0048] In this embodiment, the heating wire is an oxidation-resistant nickel-chromium heating wire. The high-temperature strength of the oxidation-resistant nickel-chromium heating wire is higher than that of iron-chromium-aluminum, and it is not easy to deform under high-temperature use. Its structure is not easy to change, it has good plasticity, and it is easy to repair. It has high emissivity, is non-magnetic, has strong corrosion resistance, and has a long service life. Nickel-chromium alloy has good wear resistance, can maintain good mechanical properties for a long time, and extend its service life.

[0049] In this embodiment, the core rod material is a magnesium oxide tube. Since the heating temperature of the electric heating tube is relatively high, a high temperature resistant magnesium oxide tube is used.

[0050] In this embodiment, a bellows 26 is provided on the tube body 1 , and a connecting piece 28 is provided between the tube body 1 and the bellows 26 . The tube body 1 and the bellows 26 can be connected via a threaded structure and the connecting piece 28 .

[0051] In this embodiment, the connecting member 28 is a hollow structure, and an internal thread cavity is disposed in the connecting member 28 .

[0052] In this embodiment, a wire outlet connector 27 is provided at one end of the corrugated tube 26 .

[0053] In this embodiment, the temperature sensing wire and the conductive member passing through the end of the first core rod 14 are led out to the outside of the electric heating tube along the connecting member 28 , the corrugated tube 26 and the outlet connector 27 .

[0054] The second core rod 15 does not need to be inserted into the temperature sensing wire, which effectively saves the temperature sensing wire material. The temperature measuring end of the temperature sensing wire is moved to the middle position of the core rod, so that the temperature measurement is more accurate.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0056] In the above description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0057] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the above description of the present application, unless otherwise clearly specified and limited, if the terms "install", "connect", "connect", "fix" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection using screws, rivets or welding, or a detachable connection, or integrated through metal processing (die casting, deep drawing, stamping, lathe and other mechanical processing methods) or through injection molding; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0059] In the above description of the present application, unless otherwise clearly stipulated and limited, if there is a description that a first feature is "on" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

Claims

1. An industrial electric heating pipe, comprising a pipe body (1) provided with a heating assembly (2) and a temperature sensing assembly (3), wherein the pipe body (1) is provided with an inner cavity for accommodating and installing the heating assembly (2) and the temperature sensing assembly (3), characterized in that: The temperature measuring end of the temperature sensing assembly (3) is located at a middle position inside the tube body (1), and / or the temperature measuring end of the temperature sensing assembly (3) is located at a middle position of the heating assembly (2); A positioning ring (4) connected to the temperature measuring end of the temperature sensing assembly (3) is provided at the middle position of the heating assembly (2). The temperature sensing assembly (3) is fixed at the middle position of the heating assembly (2) by means of the positioning ring (4). During the electric heating process of the industrial electric heating pipe, the temperature measuring end of the temperature sensing assembly (3) measures the temperature of the middle position of the heating section of the industrial electric heating pipe.

2. The industrial electric heating tube according to claim 1, characterized in that: The positioning ring (4) is made of conductive material. The temperature measuring end of the temperature sensing assembly (3) includes a positive temperature measuring end (5) and a negative temperature measuring end (6). The positive temperature measuring end (5) and the negative temperature measuring end (6) are respectively connected to the positioning ring (4). The positive temperature measuring end (5) and the negative temperature measuring end (6) form a conductive connection through the positioning ring (4).

3. The industrial electric heating tube according to claim 1, characterized in that: The temperature sensing assembly (3) comprises a positive temperature sensing wire (7) and a negative temperature sensing wire (8), the end of the positive temperature sensing wire (7) is connected to the positioning ring (4), the end of the negative temperature sensing wire (8) is connected to the positioning ring (4), the end of the positive temperature sensing wire (7) forms a positive temperature measuring end (5), and the end of the negative temperature sensing wire (8) forms a negative temperature measuring end (6); An insulating member (9) is provided on the positioning ring (4), and a through hole for passing the conductive member is provided on the insulating member (9). The positioning ring (4) is sleeved on the outside of the insulating member (9), and the positive temperature measuring end (5) and the negative temperature measuring end (6) are separated from the conductive member by the insulating member (9).

4. The industrial electric heating tube according to claim 3, characterized in that: The insulating member (9) is provided with a first notch (12) corresponding to the positive temperature measuring end (5), and the insulating member (9) is provided with a second notch (13) corresponding to the negative temperature measuring end (6); when the positive temperature measuring end (5) is connected to the positioning ring (4), part of the positive temperature measuring end (5) is limited between the first notch (12) and the inner side of the positioning ring (4), and when the negative temperature measuring end (6) is connected to the positioning ring (4), part of the negative temperature measuring end (6) is limited between the second notch (13) and the inner side of the positioning ring (4).

5. The industrial electric heating tube according to claim 4, characterized in that: The heating assembly (2) comprises a core rod which is arranged in a split manner, wherein the core rod comprises a first core rod (14) and a second core rod (15), the first core rod (14) and the second core rod (15) have tubes of equal length, and a positioning ring (4) is arranged between the first core rod (14) and the second core rod (15); the first core rod (14) and the second core rod (15) clamp the positioning ring (4) up and down, so that the temperature sensing assembly (3) connected to the positioning ring (4) is located in the middle of the heating assembly (2).

6. The industrial electric heating tube according to claim 5, characterized in that: The heating assembly (2) comprises a first temperature sensing wire plug-in cavity (16) for inserting a positive temperature sensing wire (7) on a first core rod (14), and a second temperature sensing wire plug-in cavity (17) for inserting a negative temperature sensing wire (8) on the first core rod (14); the first temperature sensing wire plug-in cavity (16) is connected to the first notch (12), and the second temperature sensing wire plug-in cavity (17) is connected to the second notch (13).

7. The industrial electric heating tube according to claim 6, characterized in that: The first core rod (14) and the second core rod (15) are both provided with a first conductive plug-in cavity (18) and a second conductive plug-in cavity (19); The insulating member (9) is provided with a first through hole (10) and a second through hole (11); the first through hole (10) is connected to the first conductive plug cavity (18), and the second through hole (11) is connected to the second conductive plug cavity (19); The conductive member comprises a first conductive member (20) inserted into the first conductive plug-in cavity (18) and the first via hole (10), and a second conductive member (21) inserted into the second conductive plug-in cavity (19) and the second via hole (11).

8. The industrial electric heating tube according to claim 7, characterized in that: The first core rod (14) and the second core rod (15) are both provided with heating wires, and a conductive connection is formed between the heating wires and the conductive member; The first conductive member (20) and the second conductive member (21) passing through the end of the second core rod (15) are both provided with a first insulating sleeve.

9. The industrial electric heating tube according to claim 8, characterized in that: The first core rod (14) is provided with a first avoidance lower notch (23) and a first avoidance upper notch (32), the first avoidance lower notch (23) is connected to the second conductive plug-in cavity (19) of the first core rod (14), the first avoidance upper notch (32) is connected to the first conductive plug-in cavity (18) of the first core rod (14), the second core rod (15) is provided with a second avoidance upper notch (24) and a second avoidance lower notch (31), the second avoidance upper notch (24) is connected to the first conductive plug-in cavity (18) of the second core rod (15), and the second avoidance lower notch (31) is connected to the second conductive plug-in cavity (19) of the second core rod (15); The heating wire comprises a first heating wire (34) wound on the outside of the first core rod (14), and a second heating wire (33) wound on the outside of the second core rod (15); The head end portion of the first heating wire (34) wound on the outside of the first core rod (14) is inserted into the first conductive plug-in cavity (18) of the first core rod (14) through the first avoidance upper notch (32) to form a first inner tube heating wire (28), and the first inner tube heating wire (28) forms conductive contact with the first conductive member (20); the tail end portion of the first heating wire (34) wound on the outside of the first core rod (14) is inserted into the second conductive plug-in cavity (19) of the first core rod (14) through the first avoidance lower notch (23) to form a second inner tube heating wire (29), and the second inner tube heating wire (29) forms conductive contact with the second conductive member (21); The head end portion of the second heating wire (33) wound on the outer side of the second core rod (15) is inserted into the first conductive plug-in cavity (18) of the second core rod (15) through the second avoidance upper notch (24) to form a third inner tube heating wire (35), and the third inner tube heating wire (35) forms conductive contact with the first conductive member (20). The tail end portion of the second heating wire (33) wound on the outer side of the second core rod (15) is inserted into the second conductive plug-in cavity (19) of the second core rod (15) through the second avoidance lower notch (31) to form a fourth inner tube heating wire (36), and the fourth inner tube heating wire (36) forms conductive contact with the second conductive member (21).

10. The industrial electric heating tube according to claim 9, characterized in that: One end of the tube body (1) is a sealed end, and the other end of the tube body (1) is provided with a sealing member (25). The sealing member (25) is provided with a perforation corresponding to each temperature sensing wire and the conductive member. The positive temperature sensing wire (7) and the negative temperature sensing wire (8) passing through the end of the second core rod (15) are both provided with a second insulating sleeve. The inner cavity of the tube body (1) is provided with magnesium oxide powder, and the magnesium oxide powder fills the gap between the core rod and the inner cavity of the tube body (1). The core rod and the temperature sensing assembly (3) located on the core rod are sealed in the inner cavity of the tube body (1) through a sealing member (25), wherein a sealing structure is formed between the insulating sleeve and the corresponding perforation to prevent the magnesium oxide powder from leaking out of the inner cavity of the tube body (1).

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