Pipeline type electric heating device

Abstract

The pipeline type electric heating device comprises a shell assembly, an electric heating pipe assembly, a temperature control assembly, a drainage piece and a backflow piece, the shell assembly comprises a shell and a socket box, the electric heating pipe assembly comprises an electric heating pipe, the two ends of the electric heating pipe are connected with a left end cover and a right end cover respectively, and the temperature control assembly comprises a temperature control support. A circuit board, a temperature sensor and a temperature control switch are arranged on the temperature control bracket; the drainage piece comprises a drainage piece body and a drainage convex block, the drainage convex block comprises a shielding part and a drainage part, and the drainage piece body and the drainage part are respectively provided with drainage holes corresponding to the electric heating tube; the backflow piece comprises a backflow piece body and a backflow protruding block, and a backflow hole is formed in the middle of the backflow protruding block. The electric heating tube, the temperature control switch and the temperature sensor are electrically connected with the socket. By shielding the low-temperature area, the time for airflow to pass through the electric heating tube is prolonged, airflow is guided to forcibly pass through the electric heating tube and the surrounding high-temperature area, the service life of the electric heating tube can be prolonged, and heat efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline heating, and more particularly to a pipeline electric heating device. Background Art

[0002] Pipe heater is an electric heating device that heats the medium, converting electrical energy into thermal energy of the medium. Pipe heaters usually use electric heating tubes as heating elements to directly heat the medium in the heater. Pipe heaters are widely used in pre-heating of heavy oil, asphalt, clean oil and other fuel oils.

[0003] The traditional electric heater is an armored heating wire structure, that is, the heating wire is placed in a metal tube, and the metal tube is filled with insulating materials (such as aluminum oxide, magnesium oxide, etc.), and then compacted into one piece by a mold. Due to the increase in the space filled with armor and a large amount of insulating materials, its volume increases and its weight becomes heavy. The heat generated by the heating wire is conducted through the insulating material and the metal tube, resulting in low thermal efficiency. Therefore, this is a technical problem that urgently needs to be solved in this field.

[0004] A Chinese patent document discloses a pipe heater (patent authorization number: CN221223009U, authorization announcement date: 2024.6.25), which includes a heater body, wherein the heater body includes a pipe body, a plurality of electric heating tubes arranged in the pipe body, a water inlet pipe connected to the pipe body, a water outlet pipe connected to the top of the pipe body, a plurality of first guide plates connected to the top of the pipe body, and a plurality of second guide plates connected to the bottom of the pipe body. The first guide plates and the second guide plates are alternately arranged to form an S-shaped liquid flow path. The outer side of the bottom of the pipe body is connected to a box body, the bottom of the box body is connected to a sewage collecting box, and the bottom of the pipe body near the second guide plate is connected to a sewage branch pipe, all the sewage branch pipes are connected to the sewage collecting box, and the lower end of the sewage collecting box is connected to a sewage main pipe. The above technical problems are not solved.

[0005] The prior art discloses a needle tube milk heater (application publication number: CN104936321A, application publication date: 2015.9.23), which includes a heating wire, a ceramic frame, a ring-shaped ceramic tube, a stainless steel shell, a temperature control switch, a heater stabilizing convex body, etc. The heating wire is wound on a round ceramic frame, which is conducive to heating the milk box. Although the heating wire is wound on the ceramic frame, its technical field is different from the technical field of the present application, and the technical problems solved are also different. Summary of the invention

[0006] In view of this, the present invention provides a pipeline electric heating device, including a shell assembly, an electric heating pipe assembly, a temperature control assembly, a flow guide and a return member, wherein:

[0007] The housing assembly comprises a housing and a socket box, wherein the housing is a hollow cylindrical structure, the left and right ends of the housing are respectively connected with a left end cover and a right end cover, the outer wall of the housing is provided with the socket box near the left end cover, and the socket is installed on the socket box;

[0008] The electric heating tube assembly includes at least three electric heating tubes, each of which is a hollow structure. The at least three electric heating tubes are symmetrically arranged around the rotation axis of the shell, and both ends of the electric heating tube are respectively connected to the left end cover and the right end cover;

[0009] The temperature control component includes a temperature control bracket, the extension direction of the temperature control bracket is parallel to the rotation axis of the shell, the temperature control bracket is provided with a circuit board, a temperature sensor and a temperature control switch, the temperature sensor is connected to the circuit board, the temperature control bracket is located in the shell, and the left and right ends thereof are respectively threadedly connected to the left end cover and the right end cover, and the temperature control switch is a snap-type temperature control switch;

[0010] The guide member includes a guide member body and a guide protrusion connected to the guide member body, the guide member body is a hollow ring body, the guide member body is connected to the left end cover, the middle part of the left end cover has a left hollowing, along the direction of the left end cover pointing to the right end cover, the left hollowing corresponds to the guide protrusion, the guide protrusion protrudes away from the left end cover, the guide protrusion is a cone structure, the guide protrusion includes a shielding part and a guide part, the shielding part is located in the central area of ​​the cone structure, the guide part is located in the edge area of ​​the cone structure, and is respectively connected to the shielding part and the guide member body, the axis of the shielding part coincides with the rotation axis of the shell, and the guide member body and the guide part are respectively provided with drainage holes corresponding to the electric heating pipe;

[0011] The drainage hole includes a V-shaped hole and a semicircular hole connected to the V-shaped hole, the V-shaped hole is opened on the side of the drainage part away from the shielding part, and the semicircular hole is located on the side of the drainage part close to the drainage part of the drainage member body; along the direction from the left end cover to the right end cover, the orthographic projection of the V-shaped hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, or the orthographic projection of the V-shaped hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the V-shaped hole is connected to the hollow part of the electric heating tube; along the direction from the left end cover to the right end cover, the orthographic projection of the semicircular hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, or the orthographic projection of the semicircular hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the semicircular hole is connected to the hollow part of the electric heating tube;

[0012] The reflux component comprises a reflux component body and a reflux protrusion connected to the reflux component body, the reflux component body is connected to the right end cover, the middle part of the right end cover has a right hollowing out, along the direction from the left end cover to the side of the right end cover, the right hollowing out corresponds to the reflux protrusion, the reflux protrusion protrudes away from the right end cover, and the middle part of the reflux protrusion is provided with a reflux hole, the reflux hole penetrates the reflux protrusion along the direction from the left end cover to the side of the right end cover; along the direction from the left end cover to the side of the right end cover, the orthographic projection of the reflux hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are partially aligned, or the orthographic projection of the reflux hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are completely aligned, and the reflux hole, the hollow part of the electric heating pipe and the drainage hole are connected;

[0013] The electric heating tube, the temperature control switch and the temperature sensor are electrically connected to the socket.

[0014] Compared with the prior art, the pipeline electric heating device provided by the present invention achieves at least the following beneficial effects:

[0015] The pipeline electric heating device provided by the present invention comprises a shell assembly, an electric heating pipe assembly, a temperature control assembly, a flow guide and a return member, wherein the shell assembly comprises a shell and a socket box, the shell is a hollow cylindrical structure, the left and right ends of the shell are respectively connected to a left end cover and a right end cover, a socket box is arranged on the outer wall of the shell near the left end cover, and a socket is installed on the socket box; the electric heating pipe assembly comprises at least three electric heating pipes, the electric heating pipes are a hollow structure, at least three electric heating pipes are symmetrically arranged around the rotation axis of the shell, and the two ends of the electric heating pipes are respectively connected to the left end cover and the right end cover; the temperature control assembly comprises a temperature control bracket, the extension direction of the temperature control bracket is parallel to the rotation axis of the shell, and the temperature control bracket is provided with a circuit The invention relates to a circuit board, a temperature sensor and a temperature control switch, wherein the temperature sensor is electrically connected to the circuit board, the temperature control bracket is located in the shell, and its left and right ends are respectively connected to the left end cover and the right end cover, and the temperature control switch is a pop-up temperature control switch; the drainage piece includes a drainage piece body and a drainage protrusion connected to the drainage piece body, the drainage piece body is connected to the left end cover, the drainage protrusion protrudes to the side away from the left end cover, the drainage protrusion is a conical structure, the drainage protrusion includes a shielding part and a drainage part, the shielding part is located in the central area of ​​the cone structure, the drainage part is located in the edge area of ​​the cone structure, and are respectively connected to the shielding part and the drainage piece body, the axis of the shielding part coincides with the rotation axis of the shell, and the drainage piece body and the drainage part are provided with A drainage hole corresponding to the electric heating tube; the drainage hole includes a V-shaped hole and a semicircular hole connected to the V-shaped hole, the V-shaped hole is opened on the side of the drainage part away from the shielding part, and the semicircular hole is located on the side of the drainage part close to the drainage part of the drainage part; along the direction from the left end cover to the right end cover, the orthographic projection of the V-shaped hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, the orthographic projection of the V-shaped hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the V-shaped hole is connected to the hollow part of the electric heating tube; along the direction from the left end cover to the right end cover, the orthographic projection of the semicircular hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, and the orthographic projection of the semicircular hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube. The semicircular hole is connected to the hollow part of the electric heating pipe; the return piece includes a return piece body and a return protrusion connected to the return piece body, the return piece body is connected to the right end cover, the return protrusion protrudes away from the right end cover, and a return hole is opened in the middle of the return protrusion. The return hole penetrates the drainage protrusion along the direction X from the left end cover to the right end cover. In the direction from the left end cover to the right end cover, the orthographic projection of the return hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are partially aligned, or the orthographic projection of the return hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are completely aligned, and the return hole, the hollow part of the electric heating pipe and the drainage hole are connected;The electric heating tube, the temperature control switch, the temperature sensor and the socket are electrically connected. The above scheme is adopted to block the low temperature area, increase the time for the airflow to pass through the electric heating tube, and guide the airflow to forcibly pass through the electric heating tube and the high temperature area around it, which can not only extend the life of the electric heating tube, but also have high thermal efficiency. At the same time, when the temperature rise exceeds the use requirements, the heating power supply is forcibly cut off, thereby improving safety and reliability; in addition, since the electric heating tube is a hollow structure, the weight of the electric heating tube assembly can also be reduced. ;

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0017] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 It is a structural schematic diagram of a pipeline electric heating device provided by the present invention;

[0020] Figure 2 It is a structural schematic diagram of a pipeline type electric heating device with bolts provided by the present invention;

[0021] Figure 3 It is a cross-sectional schematic diagram of a pipeline type electric heating device provided by the present invention;

[0022] Figure 4 It is a half-section view of a pipeline type electric heating device provided by the present invention;

[0023] Figure 5 It is a structural schematic diagram of a temperature control component provided by the present invention;

[0024] Figure 6 It is a structural schematic diagram of a drainage member provided by the present invention;

[0025] Figure 7 It is a structural schematic diagram of a reflux component provided by the present invention;

[0026] Figure 8 It is a circuit diagram of a pipeline electric heating device provided by the present invention;

[0027] Fig. 9 It is a schematic diagram of the use state of a pipeline type electric heating device provided by the present invention;

[0028] Fig.10 It is a schematic diagram of assembling an electric heating tube, a left locking piece and a right locking piece provided by the present invention;

[0029] Fig.11 It is a structural schematic diagram of a left end cover provided by the present invention;

[0030] Fig.12 It is a structural schematic diagram of a right end cover provided by the present invention;

[0031] Fig.13 It is a structural schematic diagram of a left supporting ring provided by the present invention. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] See also Figure 1-Figure 13 As shown, Figure 1 It is a structural schematic diagram of a pipeline electric heating device provided by the present invention; Figure 2 It is a structural schematic diagram of a pipeline type electric heating device with bolts provided by the present invention; Figure 3 It is a cross-sectional schematic diagram of a pipeline type electric heating device provided by the present invention; Figure 4 It is a half-section view of a pipeline type electric heating device provided by the present invention; Figure 5 It is a structural schematic diagram of a temperature control component provided by the present invention; Figure 6 It is a structural schematic diagram of a drainage member provided by the present invention;

[0038] Figure 7 It is a structural schematic diagram of a reflux component provided by the present invention; Figure 8 It is a circuit diagram of a pipeline electric heating device provided by the present invention; Fig. 9 It is a schematic diagram of the use state of a pipeline type electric heating device provided by the present invention; Fig.10 It is a schematic diagram of assembling an electric heating tube, a left locking piece and a right locking piece provided by the present invention; Fig.11 It is a structural schematic diagram of a left end cover provided by the present invention; Fig.12 It is a structural schematic diagram of a right end cover provided by the present invention; Fig.13 : is a structural schematic diagram of a left support ring provided by the present invention. In this embodiment, a pipeline electric heating device comprises a housing assembly 1, an electric heating pipe assembly 2, a temperature control assembly 3, a flow guide 4 and a return member 5, wherein:

[0039] The housing assembly 1 comprises a housing 11 and a socket box 12. The housing 11 is a hollow cylindrical structure. The left and right ends of the housing 11 are respectively connected to a left end cover 6 and a right end cover 7. The outer wall of the housing 11 is provided with a socket box 12 near the left end cover 6. The socket box 12 is provided with a socket 8.

[0040] The electric heating tube assembly 2 includes at least three electric heating tubes 21, which are hollow structures. The at least three electric heating tubes 21 are symmetrically arranged around the rotation axis of the shell 11, and the two ends of the electric heating tube 21 are respectively connected to the left end cover 6 and the right end cover 7;

[0041] The temperature control assembly 3 includes a temperature control bracket 31, the extension direction of the temperature control bracket 31 is parallel to the rotation axis of the housing 11, a circuit board 32, a temperature sensor 33 and a temperature control switch 34 are arranged on the temperature control bracket 31, the temperature sensor 33 is electrically connected to the circuit board 32, the temperature control bracket 31 is located in the housing 11, and its left and right ends are respectively threadedly connected to the left end cover 6 and the right end cover 7, and the temperature control switch 34 is a snap-type temperature control switch 34;

[0042] The flow guide 4 includes a flow guide body 41 and a flow guide protrusion 42 connected to the flow guide body 41. The flow guide body 41 is a hollow ring body. The flow guide body 41 is connected to the left end cover 6. The middle part of the left end cover 6 has a left hollow 63, which points to the direction of the right end cover 7 along the left end cover 6. The left hollow 63 corresponds to the flow guide protrusion 42. The flow guide protrusion 42 protrudes away from the left end cover 6. The flow guide protrusion 42 is a cone structure. The flow guide protrusion 42 includes a shielding portion 421 and a flow guide portion 422. The shielding portion 421 is located in the central area of ​​the cone structure, and the flow guide portion 422 is located in the edge area of ​​the cone structure, and is respectively connected to the shielding portion 421 and the flow guide body 41. The axis of the shielding portion 421 coincides with the rotation axis of the shell 11. The flow guide body 41 and the flow guide portion 422 are provided with a flow guide hole 43 corresponding to the electric heating pipe 21.

[0043] The drainage hole 43 includes a V-shaped hole 431 and a semicircular hole 432 connected to the V-shaped hole 431. The V-shaped hole 431 is opened on the side of the drainage part 422 away from the shielding part 421, and the semicircular hole 432 is located on the side of the drainage part 422 close to the drainage part 422 of the drainage member body 41; along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the V-shaped hole 431 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, the orthographic projection of the V-shaped hole 431 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the V-shaped hole 431 is connected to the hollow part of the electric heating tube 21; along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the semicircular hole 432 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, the orthographic projection of the semicircular hole 432 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the semicircular hole 432 is connected to the hollow part of the electric heating tube 21;

[0044] The reflux member 5 includes a reflux member body 51 and a reflux protrusion 52 connected to the reflux member body 51. The reflux member body 51 is connected to the right end cover 7. The middle part of the right end cover 7 has a right hollow 73. The middle part of the right end cover 7 has a right hollow 73, which points to the right end cover 7 along the left end cover 6. The right hollow 73 corresponds to the reflux protrusion 52. The reflux protrusion 52 protrudes away from the right end cover 7. The middle part of the reflux protrusion 52 is provided with a reflux hole 521. The reflux hole 521 is arranged along the left end cover 6. The direction X from the end cover 6 to the side of the right end cover 7 passes through the reflux protrusion 52, and along the direction X from the left end cover 6 to the side of the right end cover 7, the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21, and the orthographic projection of the drainage hole 43 are partially aligned, or the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21, and the orthographic projection of the drainage hole 43 are completely aligned, and the reflux hole 521, the hollow part of the electric heating tube 21, and the drainage hole 43 are connected;

[0045] The electric heating tube 21 , the temperature control switch 34 , and the temperature sensor 33 are electrically connected to the socket 8 .

[0046] Specifically, the pipeline electric heating device of this embodiment may be a pipeline heater, which may be installed in series in a pipeline to heat the air, and the pipeline may be a metal pipeline.

[0047] Combination Figure 1-Figure 4 As shown, the pipeline electric heating device includes a housing assembly 1, an electric heating pipe assembly 2, a temperature control assembly 3, a flow guide 4 and a return flow 5, wherein:

[0048] The shell assembly 1 includes a shell 11 and a socket box 12. The shell 11 is a hollow cylindrical structure. The material of the shell 11 includes metal materials, such as steel, aluminum, copper or zinc. The shell 11 can be bent into a cylindrical shape by sheet metal. The shell 11 is subjected to a reverse pressure difference test. The test pressure is 40KPa and maintained for 3-5 minutes. The shell 11 is required to be free of deformation. The left and right ends of the shell 11 are respectively connected with a left end cover 6 and a right end cover 7. The left end cover 6 and the right end cover 7 can not only protect the left and right ends of the shell 11, but also cover the left and right ends of the shell 11. The left end cover 6 and the right end cover 7 are fixed to the shell 11 by threads, which increases the overall stability and prevents the shell 11 from loosening or being damaged due to vibration during operation. The design of the left end cover 6 and the right end cover 7 makes it easy to disassemble and replace the components inside the shell, which is convenient for the maintenance and maintenance of the tubular heater. The left end cover 6 and the right end cover 7 coincide with the rotation axis of the shell 11.

[0049] A socket box 12 is connected to the outer wall of the shell 11 near the left end cover 6. The socket 8 is fixed on the socket box 12 for electrical signal transmission. The notch 610 of the socket box 12 is connected to the shell 11. After the connection, the socket 8 forms an independent cavity. The model of the socket 8 can be J599 / 20JD97PN.

[0050] The electric heating tube assembly 2 includes a plurality of electric heating tubes 21. The electric heating tubes 21 are hollow structures. The number of the electric heating tubes 21 can be adjusted according to actual conditions. Figure 4As shown, this embodiment only takes 6 electric heating tubes 21 as an example, such as AI group, AII group, BI group, BII group, CI group and CII group. The extension direction of the electric heating tube 21 is the same as the axial direction X of the shell 11. The 6 electric heating tubes 21 are arranged symmetrically around the rotation axis of the shell 11. The central symmetry means that the radial distance from each electric heating tube 21 to the rotation axis of the shell 21 is equal, that is, the 6 electric heating tubes 21 are evenly distributed along the inner circumference of the shell 11 to ensure the uniformity of heating. The two ends of the electric heating tube 21 are respectively connected to the left end cover 6 and the right end cover 7. For example, the left end of the electric heating tube 21 and the left end cover 6 and the right end of the electric heating tube 21 and the right end cover 7 are connected by threads. The symmetry axis formed by the 6 electric heating tubes 21 is parallel to the rotation axis of the shell 11, that is, when the 6 electric heating tubes 21 are arranged in the shell 11, the 6 electric heating tubes 21 form a An imaginary center line or axis of symmetry. If the six electric heating tubes 21 are evenly and symmetrically arranged around the imaginary center line, then this axis of symmetry is the center of the arrangement of the six electric heating tubes 21. If the six electric heating tubes 21 are symmetrically arranged with the rotation center of the shell 11 as the center, it helps to ensure uniform heat distribution, avoid local overheating, improve heating efficiency and system stability, and reduce vibration and stress concentration caused by asymmetric heating, thereby extending the service life of the equipment. Different heating rated powers are achieved by controlling the number of electric heating tubes 21 put into operation, and the heating intensity can be adjusted according to actual needs. For example, if only a lower heating power is required, only a part of the electric heating tubes 21 are started, and when a higher power is required, all the electric heating tubes 21 can work at the same time. This design flexibility enables the equipment to adapt to different heating needs, thereby improving energy utilization efficiency and ease of operation.

[0051] Combination Figure 2 , Figure 3 , Figure 5 and Fig. 9As shown, the temperature control component 3 includes a temperature control bracket 31, the extension direction of the temperature control bracket 31 is parallel to the rotation axis of the shell 11, and the left and right ends of the temperature control bracket 31 can be connected to the left end cover 6 and the right end cover 7 respectively to firmly fix the temperature control bracket 31, such as the left end cover 6 and the right end cover 7 are respectively threadedly connected to the left and right ends of the temperature control bracket 31, and are located between adjacent electric heating tubes 21; except for the left and right ends of the temperature control bracket 31, the cross-sectional shape of the temperature control bracket 31 along the radial direction Y of the shell 11 is U-shaped, and the U-shaped opening faces the inner surface of the shell 11, which is conducive to the installation of the circuit board 32, the temperature sensor 33, the temperature control switch 34 and the layout of the wires on the temperature control bracket 31. A circuit board 32, a temperature sensor 33 and a temperature control switch 34 are installed on the temperature control bracket 31. The temperature sensor 33 is electrically connected to the circuit board 32. The temperature sensor 33 is used to detect the temperature in real time. The circuit board 32 is used to fix the temperature sensor 33 and connect the pin of the temperature sensor 33 to the three-twisted shielded wire pad; the temperature control switch 34 is used to control the conduction or disconnection of the electric heating tube 21. The temperature control switch 34 can be connected in series in the circuit of the electric heating tube 21. Specifically, the temperature sensor 33 is used to detect the ambient temperature in the housing 11, and then outputs a temperature signal that complies with the single bus communication protocol by detecting the temperature, and the error is not greater than ±3°C. After receiving the temperature signal, the host computer (such as the control box) can perform real-time monitoring. When the specified temperature value is exceeded, the host computer controls to cut off the power supply of the electric heating tube 21. When encountering special circumstances (such as damage to the front-end fan 9), the temperature control switch 34 reaches the set temperature protection value, the reed pops up, the circuit of the electric heating tube 21 is disconnected, and the heating stops. When the temperature drops to the normally closed temperature of the temperature control switch 34, the temperature control switch 34 closes, and the electric heating tube 21 starts working again; the temperature control switch 34 is a sudden jump temperature control switch, which is not interfered by electromagnetic signals, etc., and is a self-protection switch, that is, under certain conditions (such as the front-end fan 9 is damaged, the electric heating tube 21 continues to heat, causing the temperature in the housing 11 to be too high), it can disconnect the circuit. The sudden jump temperature control switch can be a bimetallic disc instantaneous temperature control switch, and the model of the bimetallic disc instantaneous temperature control switch can be KJWD-60A20-1. The model of the above-mentioned temperature sensor 33 can be DALLAS18B20 temperature sensor or HR18B20T temperature sensor, and the model of the circuit board can be 088-Z3-015.

[0052] Combination Figure 1 and Figure 6 As shown, the guide member 4 includes a guide member body 41 and a guide protrusion 42. The guide member body 41 can be a hollow ring body. The guide member body 41 and the guide protrusion 42 are fixedly connected, and the two can be an integrated structure. Designing the guide member body 41 and the guide protrusion 42 as an integrated structure can not only shorten the assembly time between the guide member body 41 and the guide protrusion 42, but also improve the stability of the guide member 4.

[0053] Combination Figure 2 , Figure 6 , Fig. 9 and Fig.11 As shown, the flow guide body 41 and the left end cover 6 can be connected by a thread, the middle part of the left end cover 6 is a left hollow 63, and the left hollow 63 corresponds to the flow guide protrusion 42 along the direction of the left end cover 6 pointing to the side of the right end cover 7. The flow guide protrusion 42 protrudes away from the left end cover 6. The flow guide protrusion 42 is a conical structure. The flow guide protrusion 42 includes a shielding portion 421 and a flow guide portion 422 connected to the shielding portion 421. The shielding portion 421 is used to shield the airflow generated by the fan 9, and the flow guide portion 422 is used to guide the airflow generated by the fan 9. The shielding portion 421 is located in the central area of ​​the cone structure, and the flow guide portion 422 is located in the cone structure. , and are respectively connected to the shielding portion 421 and the guide member body 41. One side of the guide member 422 is fixedly connected to the shielding portion 421, and the other side is fixedly connected to the guide member body 41. The axis of the shielding portion 421 coincides with the rotation axis of the shell 11. The guide member body 41 and the guide member 422 are provided with guide holes 43 corresponding to the electric heating pipe 21. The guide holes 43 penetrate the guide portion 422 and the guide member body 41 along the direction X from the left end cover 6 to the right end cover 7. That is, the guide holes 43 are through holes, which can subsequently guide the airflow generated by the fan 9 into the shell 11 and correspond to the high temperature area around the electric heating pipe 21.

[0054] Combination Figure 1 and Figure 6 As shown, in the above scheme, the opening of the V-shaped hole 431 faces the side of the guide body 41, the semicircular hole 432 is connected to the V-shaped hole 431, the V-shaped hole 431 is evenly distributed on the guide portion 422, the semicircular hole 432 is adapted to the V-shaped hole 431, the number of the V-shaped holes 431 and the semicircular holes 432 can be adjusted according to the number of the electric heating tubes 21, and this embodiment does not limit this. The V-shaped hole 431 is opened on the side of the guide portion 422 away from the shielding portion 421, and the V-shaped hole 431 penetrates the guide portion 422 along the direction X from the left end cover 6 to the right end cover 7 side, and the semicircular hole 432 is located on the side of the guide body 41 close to the guide portion 422, and the semicircular hole 432 penetrates the guide body 41 along the direction X from the left end cover 6 to the right end cover 7 side. Along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the V-shaped hole 431 is partially aligned with the orthographic projection of the electric heating tube 21, the orthographic projection of the V-shaped hole 431 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the V-shaped hole 431 is connected to the hollow part of the electric heating tube 21; along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the semicircular hole 432 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, or the orthographic projection of the semicircular hole 432 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the semicircular hole 432 is connected to the hollow part of the electric heating tube 21.

[0055] The above scheme can not only effectively guide the airflow to flow inside and around each electric heating tube 21, taking away the heat of each electric heating tube 21, thereby helping to lower the operating temperature of each electric heating tube 21, reduce thermal stress, and thus extend the service life of the electric heating tube 21, but also more effectively transfer heat, improve the thermal efficiency of the electric heating tube 21, and make the pipeline electric heating device more energy-saving and efficient.

[0056] Combination Figure 1 , Figure 2 and Figure 7 As shown, the return component 5 includes a return component body 51 and a return protrusion 52. The return component body 51 is fixedly connected to the return protrusion 52. The return component body 51 and the return protrusion 52 are an integrated structure. Designing the return component body 51 and the return protrusion 52 as an integrated structure can not only shorten the assembly time between the return component body 51 and the return protrusion 52, but also improve the stability of the return component 5.

[0057] Continue to refer to Fig.12 As shown, the return member body 51 and the right end cover 7 can be connected by threads, the middle part of the right end cover 7 has a right hollow 73, the middle part of the right end cover 7 has a right hollow 73, along the direction of the left end cover 6 pointing to the right end cover 7, the right hollow 73 corresponds to the return protrusion 52, the return protrusion 52 protrudes away from the right end cover 7, the middle part of the return protrusion 52 is provided with a return hole 521, the return hole 521 penetrates the return protrusion along the direction X from the left end cover 6 to the right end cover 7 52, along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21 and the orthographic projection of the drainage hole 43 are partially aligned, or, along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21 and the orthographic projection of the drainage hole 43 are completely aligned, and the reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are connected.

[0058] Combination Figure 4 , Figure 8 , Fig. 9 , Fig.11 and Fig.12As shown, the electric heating tube 21, the temperature control switch 34, and the temperature sensor 33 are electrically connected to the socket 8. The specific working principle is as follows: the power supply is input through the socket 8, and the electric heating tube 21 generates a certain thermal power through the electric-heat conversion. If the power supply provides electric energy, when the electric energy passes through the electric heating tube 21, due to the existence of resistance, the electric energy will be converted into thermal energy. Due to the electric-heat conversion, the electric heating tube 21 starts to heat up and generates a certain thermal power. The thermal power is the amount of heat generated by the electric heating tube 21 per unit time. The fan 9 at the front end of the pipeline introduces an airflow with a certain flow rate. When the airflow encounters the guide member 4, the shielding part 421 in the guide member 4 shields the middle part of the shell 11, so that the airflow generated by the fan 9 is guided to the area with relatively large wind resistance, rather than directly passing through the central hole with the smallest wind resistance. Under the guidance of the guide member 4, the airflow passes through the high-temperature area of ​​the electric heating tube 21, and is forced to take away heat through conduction and convection. Turbulence occurs through the reflux member 5, and it is fully mixed. Then it flows out from the reflux hole 521 of the reflux member 5. The airflow generated by the fan 9 passes through the guide hole 43, the left hollow 63, each electric heating tube 21, the right hollow 73 and the reflux hole 521 in sequence to achieve the effect of heating the air. Specifically, under the guidance of the guide member 4, the external airflow is guided or naturally flows through the high-temperature area around the electric heating tube 21. The airflow contacts the surface of the electric heating tube 21 and takes away part of the heat by heat conduction. During the flow, the airflow undergoes convective heat exchange with the air in the high-temperature area to further take away the heat. After passing through the electric heating tube 21, the airflow enters the return member 5. Inside the return member 5, the airflow is obstructed and guided, resulting in turbulence (such as irregular movement of the airflow). The turbulence makes the temperature, speed and other parameters in the airflow uneven, thereby achieving full mixing of the airflow. This mixing helps to further improve the heat exchange efficiency, so that the airflow can take away the heat more evenly. After the airflow is fully mixed, the airflow flows out through the return hole 521 of the return member 5. At this time, the airflow has taken away a large amount of heat, thereby achieving a cooling effect on the electric heating tube.

[0059] Over-temperature protection: Over-temperature protection is achieved by the temperature control switch 34. The temperature control switch 34 can be a jump-type temperature control switch, such as a bimetallic disc instantaneous temperature control switch. The bimetallic disc instantaneous temperature control switch includes a reed (not shown in the figure) and a bimetallic element (not shown in the figure). The bimetallic element is formed by the superposition of two metal sheets with different thermal expansion coefficients. When the temperature sensor 33 detects abnormally high temperature, the bimetallic strip will bend due to inconsistent thermal expansion and contraction, thereby turning the electric shock on or off. The reed is used to control the on and off of the power supply. When the bimetallic strip is bent and deformed, the reed is connected or disconnected, thereby changing the power supply state; under normal circumstances, the reed is in a normally closed state and is connected in series in the circuit of the electric heating tube 21. When the fan 9 at the front end of the pipeline fails and cannot supply air or the air supply volume is reduced, the electric heating tube 21 is still heating normally, which will cause the temperature inside the shell 11 to rise. The temperature sensor 33 detects the ambient temperature inside the shell 11. When the temperature protection value set by the temperature control switch 34 is reached, the reed pops up, the circuit of the electric heating tube 21 is disconnected, and heating stops. When the temperature drops to the normally closed temperature of the temperature control switch 34, the temperature control switch 34 is closed, and the electric heating tube 21 starts to work again. The temperature protection value range set by the temperature switch is not less than 60℃-70℃, and the normally closed temperature range of the temperature control switch 34 is 50℃-60℃.

[0060] Of course, depending on the actual situation, over-temperature protection can also be achieved in other ways, such as by having the temperature sensor 33 output the current temperature value in the shell 11 to the host computer (such as a control box) in real time. When the temperature exceeds the protection value, the host computer will issue an alarm and manually cut off the power supply of the electric heating tube 21.

[0061] Combination Figure 4 and Figure 8 As shown, the socket 8 has a plurality of pins, namely, pin A, pin B, pin C, pin D, pin E, pin F, pin G, pin H, pin J, pin K, pin L and pin M;

[0062] The electric heating tubes 21 of the AI ​​group, BI group and CI group are respectively connected to the A pin, D pin and J pin of the socket 8, and the AII, BII and CII groups are respectively connected to the B pin, E pin and K pin of the socket 8. The heating of the electric heating tube 21 can adopt a 115V three-phase four-wire system. The number of the working electric heating tubes 21 can be controlled by energizing the pins on the socket 8. For example, for weak heating, 115V power is input to the A pin, D pin and J pin of the socket 8, and the electric heating tubes 21 of the AI ​​group, BI group and CI group work, and the heating rated power is 500W×3=1500W; for strong heating: 115V power is input to the A pin, B pin, D pin, E pin, J pin and K pin of the socket 8, and the electric heating tubes 21 of the AI ​​group, AII group, BI group, BII group, CI group and CII group work, and the heating rated power is 500W×6=3000W, so that different heating rated powers are achieved by controlling the number of electric heating tubes 21 put into operation.

[0063] The temperature sensor 33 is connected to the F pin, G pin and H pin of the socket 8, and the host computer provides a +5V power supply. The temperature sensor 33 can output a temperature signal that complies with the single bus communication protocol, and the error is no more than ±3°C. The device indicators of the temperature sensor 33 are: pull-up power supply voltage: 3.0-6.0V; temperature error (-55~125°C): ±2°C; maximum static current: 10μA; maximum working current: 3mA.

[0064] The temperature control switch 34 connects the C pin and the L pin in the socket 8, and is closed under normal conditions, that is, the C pin and the L pin are conductive, the circuit is in the on state, and the disconnection temperature is 65±5℃. When the ambient temperature in the shell 11 is between 60℃-70℃, the temperature control switch 34 will be disconnected; the connection temperature is 55±5℃. When the ambient temperature in the shell 11 is between 50℃-60℃, the temperature control switch 34 will be closed.

[0065] Compared with the prior art, the pipeline electric heating device provided in this embodiment achieves at least the following beneficial effects:

[0066] The pipeline electric heating device provided in this embodiment includes a shell assembly 1, an electric heating pipe assembly 2, a temperature control assembly 3, a guide piece 4 and a return piece 5, wherein the shell assembly 1 includes a shell 11 and a socket box 12, the shell 11 is a hollow cylindrical structure, and the left and right ends of the shell 11 are respectively connected to a left end cover 6 and a right end cover 7, and the outer wall of the shell 11 is provided with a socket box 12 near the left end cover 6, and a socket 8 is installed on the socket box 12; the electric heating pipe assembly 2 includes at least three electric heating pipes 21, the electric heating pipe 21 is a hollow structure, and the at least three electric heating pipes 21 are symmetrically arranged around the rotation axis of the shell 11, and the two ends of the electric heating pipe 21 are respectively connected to the left end cover 6 and the right end cover 7. The temperature control component 3 includes a temperature control bracket 31, the extension direction of the temperature control bracket 31 is parallel to the rotation axis of the shell 11, and a circuit board 32, a temperature sensor 33 and a temperature control switch 34 are arranged on the temperature control bracket 31. The temperature sensor 33 is electrically connected to the circuit board 32. The temperature control bracket 31 is located in the shell 11, and its left and right ends are respectively connected to the left end cover 6 and the right end cover 7. The temperature control switch 34 is a jump-type temperature control switch 34; the drainage member 4 includes a drainage member body 41 and a drainage protrusion 42 connected to the drainage member body 41. The drainage member body 41 is connected to the left end cover 6, and the drainage protrusion 42 protrudes to the side away from the left end cover 6. The drainage protrusion 42 is a conical structure. The drainage protrusion 42 includes a shielding portion 421 and a drainage portion 422, the shielding portion 421 is located in the central area of ​​the cone structure, the drainage portion 422 is located in the edge area of ​​the cone structure, and is respectively connected to the shielding portion 421 and the drainage member body 41, the axis of the shielding portion 421 coincides with the rotation axis of the shell 11, and the drainage member body 41 and the drainage portion 422 are provided with drainage holes 43 corresponding to the electric heating pipe 21; the drainage hole 43 includes a V-shaped hole 431 and a semicircular hole 432 connected to the V-shaped hole 431, the V-shaped hole 431 is opened on the side of the drainage portion 422 away from the shielding portion 421, and the semicircular hole 432 is located on the drainage member body 41 close to the drainage Along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the V-shaped hole 431 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, the orthographic projection of the V-shaped hole 431 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the V-shaped hole 431 is connected to the hollow part of the electric heating tube 21; Along the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the semicircular hole 432 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, the orthographic projection of the semicircular hole 432 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the semicircular hole 432 is connected to the hollow part of the electric heating tube 21;The reflux member 5 includes a reflux member body 51 and a reflux protrusion 52 connected to the reflux member body 51. The reflux member body 51 is connected to the right end cover 7. The reflux protrusion 52 protrudes away from the right end cover 7. A reflux hole 521 is provided in the middle of the reflux protrusion 52. The reflux hole 521 penetrates the drainage protrusion 42 along the direction X from the left end cover 6 to the right end cover 7. In the direction X from the left end cover 6 to the right end cover 7, the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21 and the orthographic projection of the drainage hole 43 are partially aligned, or the orthographic projection of the reflux hole 521, the orthographic projection of the hollow part of the electric heating tube 21, and the orthographic projection of the drainage hole 43 are partially aligned. The projection and the orthographic projection of the drainage hole 43 are completely aligned, and the reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are connected; the electric heating tube 21, the temperature control switch 34, the temperature sensor 33 are electrically connected to the socket 8. The above scheme is adopted to block the low temperature area, increase the time for the airflow to pass through the electric heating tube 21, and guide the airflow to forcefully pass through the electric heating tube 21 and the high temperature area around it, which can not only extend the life of the electric heating tube, but also have high thermal efficiency. At the same time, when the temperature rise exceeds the use requirements, the heating power supply is forced to be cut off, thereby improving safety and reliability; in addition, since the electric heating tube is a hollow structure, the weight of the electric heating tube assembly can also be reduced. ;

[0067] The communication between the V-shaped hole 431 and the hollow part of the electric heating tube 21 may be such that the V-shaped hole 431 and the hollow part of the electric heating tube 21 are in contact with each other along the direction X from the left end cover 6 to the right end cover 7, or the communication between the V-shaped hole 431 and the hollow part of the electric heating tube 21 may be such that the V-shaped hole 431 and the hollow part of the electric heating tube 21 are not in contact with each other along the direction X from the left end cover 6 to the right end cover 7.

[0068] The communication between the semicircular hole 432 and the hollow part of the electric heating tube 21 can be that the semicircular hole 432 and the hollow part of the electric heating tube 21 are in contact with each other along the direction X from the left end cover 6 to the right end cover 7, or the semicircular hole 432 and the hollow part of the electric heating tube 21 are not in contact with each other along the direction X from the left end cover 6 to the right end cover 7.

[0069] The above-mentioned reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are connected in such a way that the reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are sequentially fitted along the direction X from the left end cover 6 to the right end cover 7, or the reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are connected in such a way that the reflux hole 521, the hollow part of the electric heating tube 21 and the drainage hole 43 are sequentially not fitted along the direction X from the left end cover 6 to the right end cover 7.

[0070] In an optional embodiment, the orthographic projection shape of the reflux protrusion 52 along the direction X pointing from the left end cover 6 to the right end cover 7 is a circle, the reflux hole 521 includes a central hole 5210 and an edge hole 5211 connected to the central hole 5210, the central hole 5210 is located in the central area of ​​the circle, the edge holes 5211 are evenly distributed around the central hole 5210, and the orthographic projection shape of the edge holes 5211 along the direction X pointing from the left end cover 6 to the right end cover 7 is a semicircle;

[0071] Along the direction X pointing from the left end cover 6 to the side of the right end cover 7, the orthographic projection of the edge hole 5211 is partially aligned with the orthographic projection of the hollow part of the electric heating tube 21, or the orthographic projection of the edge hole 5211 is completely aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the edge hole 5211 is connected to the hollow part of the electric heating tube 21.

[0072] Combination Figure 1 and Figure 7 As shown, the center hole 5210 is a circular hole, which is designed at the center of the return protrusion 52, and the edge hole 5211 is arranged around the center hole 5210. The center hole 5210 and the edge hole 5211 both penetrate the return protrusion 52 along the direction X from the left end cover 6 to the right end cover 7. The radius of the center hole 5210 is greater than the radius of the edge hole 5211. The number of the edge holes 5211 is adapted according to the number of the electric heating tubes 21, and each edge hole 5211 corresponds to one electric heating tube 21; along the direction X from the left end cover 6 to the right end cover 7, the edge holes 5211 are arranged around the center hole 5210. The orthographic projection of 5211 is partially aligned with the orthographic projection of the electric heating tube 21, or, along the direction X from the left end cover 6 to the side of the right end cover 7, the orthographic projection of the edge hole 5211 is aligned with the orthographic projection of the hollow part of the electric heating tube 21, and the edge hole 5211 is connected to the hollow part of the electric heating tube 21. The above scheme can not only ensure that the airflow can fully contact the electric heating tube 21 when flowing through the edge hole 5211, thereby improving the heat exchange efficiency, but also increase the contact area between the airflow and the electric heating tube 21, thereby facilitating the improvement of the heat exchange effect.

[0073] The above-mentioned edge hole 5211 and the hollow part of the electric heating tube 21 can be connected in the direction X from the left end cover 6 to the right end cover 7, or the edge hole 5211 and the hollow part of the electric heating tube 21 can be connected in the direction X from the left end cover 6 to the right end cover 7.

[0074] In an alternative embodiment, in combination Figure 1 , Figure 3 , Fig. 9 and Fig.10As shown, the electric heating tube 21 includes an insulating frame 210 , which is a hollow cylindrical structure. The outer surface of the insulating frame 210 is wrapped with a heating wire 211 , and the heating wire 211 is electrically connected to the socket 8 .

[0075] In the above scheme, the electric heating tube 21 can be a power resistor. The power resistor is a resistor that is wound evenly on the insulating frame 210 with a heating wire 211 (such as a high-resistance alloy wire). It has a small temperature coefficient (low temperature coefficient, stable resistance), high precision (high resistance precision, suitable for precision circuits), good stability (good stability, can maintain a stable resistance for a long time) and high power (can withstand large power). The heating wire 211 can be a high-resistance alloy wire, such as nickel-chromium, manganese-copper. The heating wire 211 is evenly wound on the insulating frame 210. After winding and forming, the outer surface of the insulating frame 210 is coated with oil-resistant enamel or paint to fix the heating wire 211 on the insulating frame 210, effectively preventing movement and shaking, and also providing good electrical insulation and mechanical stability. Since each insulating frame 210 is a hollow cylindrical structure, the weight of the electric heating tube assembly 2 can be greatly reduced.

[0076] In the above scheme, power is input through the socket 8, and the electric heating pipe 21 generates a certain heat power through electricity-heat conversion. The fan 9 at the front end of the pipeline introduces airflow with a certain flow rate. Due to the shielding of the middle part of the guide member 4, the airflow cannot quickly pass through the central part with the smallest wind resistance. Under the guidance of the guide hole 43 in the guide member 4, the airflow passes through the insulating frame 210 and the high-temperature area around the wound electric heating wire 211, and forcedly takes away heat through conduction and convection.

[0077] Optionally, the material of the insulating frame 210 includes ceramic or plastic.

[0078] When the insulating frame 210 is made of ceramic material, it has high strength, stability and excellent thermal conductivity. For example, the ceramic material has high strength and good chemical stability, which ensures the reliability of the electric heating pipe 21 in harsh environments. At the same time, it has high thermal conductivity, which is conducive to heat dissipation.

[0079] When the insulating frame 210 is made of plastic material, such as polyimide, it can not only effectively resist aging and extend the service life, but also ensure the safe use of the electric heating tube 21 and improve the durability of the electric heating tube 21.

[0080] In an alternative embodiment, in combination Figure 1 , Figure 2 , Fig.11 , Fig.12 and Fig.13As shown, in this embodiment, the shell assembly 1 also includes a left supporting ring 13 and a right supporting ring 14. The left supporting ring 13 is arranged between the left end surface of the shell 11 and the left end cover 6, and the right supporting ring 14 is arranged between the right end surface of the shell 11 and the right end cover 7. The left end cover 6 and the left supporting ring 13 as well as the right end cover 7 and the right supporting ring 14 are respectively connected by bolts (not marked in the figure).

[0081] It should be noted that the left support ring 13, the right support ring 14 and the shell 11 can be made of aluminum alloy. The left support ring 13 and the right support ring 14 are then directly welded to the left and right ends of the shell 11, which can improve the stability between the shell 11, the left support ring 13 and the right support ring 14.

[0082] The left end cover 6 is tightly connected to the left support ring 13, and the connection method can be achieved by bolts to ensure the firmness and sealing of the connection. The main function of the left support ring 13 is to support the left end of the shell 11 to prevent it from moving or deforming due to temperature changes during heating. The right end cover 7 is tightly connected to the right support ring 14, and the connection method can also be achieved by bolts to ensure the firmness and sealing of the connection. The main function of the right support ring 14 is to support the right end of the shell 11 to prevent it from moving or deforming due to temperature changes during heating.

[0083] The bosses on the left end cover 6 and the right end cover 7 respectively cooperate with the left support ring 13 and the right support ring 14 in the shell assembly 1 to ensure the accuracy of the position of the left end cover 6 and the right end cover 7 on the shell 11, ensure that the rotation axis center line of the left end cover 6 and the right end cover 7 coincides with the rotation axis center line of the shell 11, prevent unnecessary vibration and deviation during operation, thereby improving the stability and reliability of the left end cover 6 and the right end cover 7 and the shell 11.

[0084] In an optional embodiment, the left end cover 6 includes a left connecting piece 62 connected to the flow guide body 41; the right end cover 7 includes a right end cover body 71 connected to the return body 51, and the right end cover body 71 is a hollow annular structure;

[0085] The left end of the electric heating tube 21 is connected to the left connecting piece 62 via the left locking piece 22 . The right end cover 7 further includes a right connecting piece 72 connected to the right end cover body 71 . The right end of the electric heating tube 21 is connected to the right connecting piece 72 via the right locking piece 23 .

[0086] Combination Figure 2 , Figure 3 , Fig.11 , Fig.12 and Fig.13As shown, the left end cover 6 includes a left end cover body 61 and a left connecting member 62 connected to the left end cover body 61. The left end cover body 61 and the left supporting ring 13 can be connected by bolts, and the left connecting member 62 and the drainage member body 41 can also be connected by bolts. The shape and structure of the left connecting member 62 are adapted to the shape and structure of the drainage member body 41. The left end cover body 61 has a notch 610 at a position corresponding to the socket box 12 to facilitate the installation of the socket box 12, which is beneficial for subsequent wiring. Specifically, the socket 8 is fixed to the socket box 12 for electrical signal transmission. The socket box 12 is an independent cavity structure. The wire enters the socket box 12 through the notch 610 above the left end cover body 61 to protect the wire from airflow and heat.

[0087] The right end cover 7 includes a right end cover body 71, and the right support ring 14, the right end cover body 71 and the return member body 51 can be connected together by bolts. The right end cover 7 can also include a right connecting member 72 connected to the right end cover body 71. The structure of the right connecting member 72 is the same as that of the left connecting member 62, which is conducive to fixing the electric heating pipe 21 in the housing 11, and can also make the air flow flow between the electric heating pipe 21 and the return member 5.

[0088] Optionally, the left end cover 6 and the right end cover 7 include chrome-plated aluminum alloy or stainless steel to withstand the high temperature generated by the electric heating tube 21 during operation. Specifically, the left end cover 6 and the right end cover 7 are made of aluminum alloy or stainless steel, which are materials with high strength and heat resistance and are suitable for occasions that need to withstand high temperatures. Chrome plating is a surface treatment technology that can improve the corrosion resistance and hardness of the material. At the same time, the chrome plating layer can also reflect heat to a certain extent, which helps to reduce the temperature of the aluminum alloy itself.

[0089] Continue to see Fig.10As shown, the left locking member 22 and the right locking member 23 both include a front locking ring 221 and a rear locking ring 222, and the front locking ring 221 and the rear locking ring 222 are connected together by a left locking bolt (not marked in the figure). When assembled with the electric heating tube 21, the front locking ring 221 and the rear locking ring 222 in the left locking member 22 are sleeved on the left end of the electric heating tube 21. For example, when the electric heating tube 21 includes an insulating frame 210, the front locking ring 221 and the rear locking ring 222 in the left locking member 22 are sleeved on the left end of the insulating frame 210, and the front locking ring 221 in the left locking member 22 is connected to the left connecting member 62 by threads. The right locking bolt (not marked in the figure) between the front locking ring 221 in the right locking member 23 and the right connecting member 72 is connected together. When assembled with the electric heating tube 21, the front locking ring 221 and the rear locking ring 222 in the right locking member 23 are sleeved on the right end of the electric heating tube 21. For example, when the electric heating tube 21 includes an insulating frame 210, the front locking ring 221 and the rear locking ring 222 in the right locking member 23 are sleeved on the right end of the insulating frame 210, and the front locking ring 221 in the right locking member 23 and the left connecting member 62 are connected by threads.

[0090] It should be noted that the contact gaps between the left and right end faces of the electric heating tube 21 and the left locking piece 22 and the right locking piece 23 can be coated with silicone rubber. Silicone rubber has good sealing, shock absorption and high and low temperature resistance. After coating, it can enhance the sealing effect between the electric heating tube 21 and the left locking piece 22 and the right locking piece 23 to prevent the entry of moisture, dust, etc., and also help to fix and protect the electric heating tube 21.

[0091] Adopt the above scheme, combined with Figure 3 , Figure 4 , Fig.11 and Fig.12 As shown, the left and right ends of each electric heating tube 21 can be fixed to the left end cover 6 and the right end cover 7 respectively, which can not only prevent the electric heating tube 21 from moving or falling off during operation, thereby avoiding possible safety hazards, but also facilitate the replacement and replacement of the electric heating tube 21. For example, when the electric heating tube 21 is damaged or needs to be replaced, it is only necessary to remove the left end cover 6 and the right end cover 7 to easily take out the electric heating tube 21 for replacement or repair.

[0092] Optionally, combined Figure 3 , Figure 4 , Fig.11 and Fig.12As shown, the left end cover 6 includes a left end cover body 61 connected to a left connecting member 62, the left end cover body 61 is a hollow ring structure, the left connecting member 62 includes at least three left semicircular segments 620, at least three left semicircular segments 620 are evenly distributed along the inner side of the left end cover body 61, the opening of the left semicircular segment 620 faces the central area of ​​the left end cover body 61, and the direction X along the left end cover 6 points to the side of the right end cover 7, the orthographic projection of the left semicircular segment 620 is completely aligned with the orthographic projection of the front locking ring 221 in the left locking member 22, the left semicircular segment 620 is not connected to the front locking ring 221 in the left locking member 22, a left arc segment 621 is connected between two adjacent left semicircular segments 620, and the drainage member body 41 and the front locking ring 221 in the left locking member are respectively threadedly connected to the left arc segment 621;

[0093] The right connecting member 72 includes at least three right semicircular segments 720, which are evenly distributed along the inner side of the right end cover body 71. The opening of the right semicircular segment 720 faces the central area of ​​the right end cover body 71, and the direction X pointing to the side of the right end cover 7 along the left end cover 6. The orthographic projection of the right semicircular segment 720 is completely aligned with the orthographic projection of the front locking ring 221 in the right locking member 23. The right semicircular segment 720 is not connected to the front locking ring 221 in the right locking member 23. A right arc segment 721 is connected between two adjacent right semicircular segments 720, and the front locking ring 221 in the right locking member 23 is threadedly connected to the right arc segment 721.

[0094] The number and shape of the left semicircular segment 620 in the left connecting member 62 and the right semicircular segment 720 in the right connecting member 72 can be adapted according to the number of the electric heating tubes 21, which can not only ensure that each electric heating tube 21 can be firmly connected to avoid falling off, but also can more effectively improve the heat exchange efficiency. At the same time, it is convenient for subsequent maintenance, such as replacing the electric heating tube 21, and the overall structure is easy to disassemble and assemble.

[0095] It can be seen from the above embodiments that the pipeline electric heating device provided by the present invention achieves at least the following beneficial effects:

[0096] The pipeline electric heating device provided by the present invention, through the mutual cooperation between the shell assembly, the electric heating pipe assembly, the temperature control assembly, the guide piece and the return piece, blocks the low temperature area, increases the time for the airflow to pass through the electric heating pipe, and guides the airflow to forcibly pass through the electric heating pipe and the high temperature area around it. It can not only extend the life of the electric heating pipe, but also has high thermal efficiency. At the same time, when the temperature rise exceeds the use requirements, the heating power supply is forcibly cut off, thereby improving safety and reliability. In addition, since the electric heating pipe has a hollow structure, the weight of the electric heating pipe assembly can also be reduced.

[0097] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A pipeline electric heating device, characterized in that: It includes a shell assembly, an electric heating pipe assembly, a temperature control assembly, a flow guide and a return assembly, wherein: The housing assembly comprises a housing and a socket box, wherein the housing is a hollow cylindrical structure, the left and right ends of the housing are respectively connected with a left end cover and a right end cover, the outer wall of the housing is provided with the socket box near the left end cover, and the socket is installed on the socket box; The electric heating tube assembly includes at least three electric heating tubes, each of which is a hollow structure. The at least three electric heating tubes are symmetrically arranged around the rotation axis of the shell, and both ends of the electric heating tube are respectively connected to the left end cover and the right end cover; The temperature control component includes a temperature control bracket, the extension direction of the temperature control bracket is parallel to the rotation axis of the shell, the temperature control bracket is provided with a circuit board, a temperature sensor and a temperature control switch, the temperature sensor is connected to the circuit board, the temperature control bracket is located in the shell, and the left and right ends thereof are respectively threadedly connected to the left end cover and the right end cover, and the temperature control switch is a snap-type temperature control switch; The guide member includes a guide member body and a guide protrusion connected to the guide member body, the guide member body is a hollow ring body, the guide member body is connected to the left end cover, the middle part of the left end cover has a left hollowing, along the direction of the left end cover pointing to the right end cover, the left hollowing corresponds to the guide protrusion, the guide protrusion protrudes away from the left end cover, the guide protrusion is a cone structure, the guide protrusion includes a shielding part and a guide part, the shielding part is located in the central area of ​​the cone structure, the guide part is located in the edge area of ​​the cone structure, and is respectively connected to the shielding part and the guide member body, the axis of the shielding part coincides with the rotation axis of the shell, and the guide member body and the guide part are respectively provided with drainage holes corresponding to the electric heating pipe; The drainage hole includes a V-shaped hole and a semicircular hole connected to the V-shaped hole, the V-shaped hole is opened on the side of the drainage part away from the shielding part, and the semicircular hole is located on the side of the drainage part close to the drainage part of the drainage member body; along the direction from the left end cover to the right end cover, the orthographic projection of the V-shaped hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, or the orthographic projection of the V-shaped hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the V-shaped hole is connected to the hollow part of the electric heating tube; along the direction from the left end cover to the right end cover, the orthographic projection of the semicircular hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, or the orthographic projection of the semicircular hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the semicircular hole is connected to the hollow part of the electric heating tube; The reflux component comprises a reflux component body and a reflux protrusion connected to the reflux component body, the reflux component body is connected to the right end cover, the middle part of the right end cover has a right hollowing out, along the direction from the left end cover to the side of the right end cover, the right hollowing out corresponds to the reflux protrusion, the reflux protrusion protrudes away from the right end cover, and the middle part of the reflux protrusion is provided with a reflux hole, the reflux hole penetrates the reflux protrusion along the direction from the left end cover to the side of the right end cover; along the direction from the left end cover to the side of the right end cover, the orthographic projection of the reflux hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are partially aligned, or the orthographic projection of the reflux hole, the orthographic projection of the hollow part of the electric heating pipe and the orthographic projection of the drainage hole are completely aligned, and the reflux hole, the hollow part of the electric heating pipe and the drainage hole are connected; The electric heating tube, the temperature control switch and the temperature sensor are electrically connected to the socket.

2. The pipeline electric heating device according to claim 1, characterized in that: The shape of the orthographic projection of the return protrusion along the direction from the left end cover to the side of the right end cover is a circle, the return hole includes a central hole and an edge hole connected to the central hole, the central hole is located in the central area of ​​the circle, the edge holes are evenly distributed around the central hole, and the shape of the orthographic projection of the edge holes along the direction from the left end cover to the side of the right end cover is a semicircle; Along the direction from the left end cover to the right end cover, the orthographic projection of the edge hole is partially aligned with the orthographic projection of the hollow part of the electric heating tube, or the orthographic projection of the edge hole is completely aligned with the orthographic projection of the hollow part of the electric heating tube, and the edge hole is connected to the hollow part of the electric heating tube.

3. The pipeline electric heating device according to claim 1, characterized in that: The electric heating tube comprises an insulating frame, which is a hollow cylindrical structure. An electric heating wire is wound around the outer surface of the insulating frame, and the electric heating wire is electrically connected to the socket.

4. The pipeline electric heating device according to claim 3, characterized in that: The material of the insulating frame includes ceramic or plastic.

5. The pipeline electric heating device according to claim 1, characterized in that: The shell assembly also includes a left supporting ring and a right supporting ring. The left supporting ring is arranged between the left end cover and the left end surface of the shell, and the right supporting ring is arranged between the right end cover and the right end surface of the shell. The left end cover and the left supporting ring, as well as the right end cover and the right supporting ring are respectively connected by bolts.

6. The pipeline electric heating device according to claim 1, characterized in that: The left end cover comprises a left connecting piece connected to the flow guide body; the right end cover comprises a right end cover body connected to the return body, and the right end cover body is a hollow ring structure; The left end of the electric heating tube is connected to the left connecting piece through a left locking piece, the right end cover also includes a right connecting piece connected to the right end cover body, and the right end of the electric heating tube is connected to the right connecting piece through a right locking piece.

7. The pipeline electric heating device according to claim 6, characterized in that: The left end cover comprises a left end cover body connected to the left connecting member, the left end cover body is a hollow ring structure, the left connecting member comprises at least three left semicircular segments, the at least three left semicircular segments are evenly distributed along the inner side of the left end cover body, a left arc segment is connected between two adjacent left semicircular segments, and the guide member body and the left locking member are respectively threadedly connected to the left arc segment; The right connecting piece includes at least three right semicircular segments, which are evenly distributed along the inner side of the right end cover body, a right arc segment is connected between two adjacent right semicircular segments, and the right locking piece is threadedly connected to the right arc segment.

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