Electric heating tube with independently controllable temperature zones

Abstract

The utility model relates to the technical field of heating equipment, in particular to an electric heating tube with independent and controllable temperature partitions, which comprises a mounting tube, a connector lug and a heating wire, the connector lug is mounted at one end of the mounting tube, a plurality of groups of mounting blocks and partition blocks are arranged in the mounting tube, the mounting blocks and the partition blocks are arranged in a staggered manner, and the heating wire is arranged in the mounting tube. One heating wire is mounted on each group of mounting blocks, the plurality of heating wires are circumferentially and uniformly distributed around the axis of the mounting pipe, the end parts of the heating wires are connected with conductive rods, and the conductive rods are connected with the connector lugs. The electric heating tube has the effect of improving the applicability of the electric heating tube.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to an electric heating tube with independently controllable temperature zones. Background Art

[0002] Tubular electric heating element (referred to as electric heating tube) is an electrical component that converts electrical energy into thermal energy. It uses a metal tube as the outer shell (including stainless steel and copper tubes), and spiral electric heating alloy wires (nickel-chromium, iron-chromium alloy) are evenly distributed along the central axis of the tube. The gaps are filled with compacted magnesium oxide sand with good insulation and thermal conductivity, and the two ends of the tube are sealed with silicone. This metal armored electric heating element can heat air, metal molds and various liquids.

[0003] The Chinese patent with the announcement number CN110087352B discloses an electric heating pipe, which includes an incoming wiring row, a central conductive rod, a spiral resistance wire and an outgoing wiring row; a first cold end magnesium oxide column, a central magnesium oxide column and a second cold end magnesium oxide column are arranged in a metal sheath tube; the first cold end magnesium oxide column and the second cold end magnesium oxide column are coaxially arranged above and below the central magnesium oxide column respectively; a circular ring piece with an overall spiral structure is processed on the inner wall of the central magnesium oxide column; the central conductive rod is centrally arranged in the outgoing conductive tube; the lower and upper ends of the central conductive rod are respectively connected to the resistance wire connector and the incoming wiring row; the outgoing conductive tube is connected to the outgoing wiring row; the upper end of the spiral resistance wire is electrically connected to the outgoing conductive tube, and the lower end is electrically connected to the resistance wire connector, and the other parts of the spiral resistance wire are spirally arranged on the circular ring piece on the inner wall of the central magnesium oxide column. The electric heating pipe ensures that the longitudinal pitch of the spiral resistance wire is consistent and centrally arranged, which improves the thermal conductivity efficiency of the electric heating pipe and uniforms the heating temperature.

[0004] With respect to the above-mentioned related technologies, the resistance wire inside the electric heating tube in the prior art is spiral-shaped, so that it can generate heat evenly within its length. However, if the electric heating tube in the prior art is used in a large wind tunnel warm field, it is necessary to perform local or full-length heating in the length direction of the electric heating tube as required. However, once the electric heating tube in the prior art is used, it is heated throughout the length and cannot be applied to the diverse heating modes of the large wind tunnel warm field, which reduces the applicable occasions of the electric heating tube and reduces the applicability of the electric heating tube. Utility Model Content

[0005] In order to improve the applicability of an electric heating pipe, the present application provides an electric heating pipe with independently controllable temperature zones.

[0006] The present application provides an electric heating pipe adopting the following technical solution:

[0007] A temperature-zoned electric heating tube with independently controllable electric heating elements comprises a mounting tube, a terminal head and a heating wire, wherein the terminal head is mounted at one end of the mounting tube, a plurality of mounting blocks and partition blocks are placed in the mounting tube, the mounting blocks and the partition blocks are arranged alternately, one heating wire is mounted on each group of the mounting blocks, a plurality of the heating wires are evenly distributed circumferentially around the axis of the mounting tube, a conductive rod is connected to the end of the heating wire, and the conductive rod is connected to the terminal head.

[0008] By adopting the above technical solution, the staff uses the staggered arrangement of the installation blocks and the separation blocks to separate the several heating wires in the length direction of the installation tube. The staff can then energize the conductive rods corresponding to the positions of the heating wires according to demand to make the electric heating tube generate heat locally. At the same time, the staff can also connect several conductive rods in parallel to increase the heating power of the electric heating tube, or connect several conductive rods in series to make the electric heating tube heat at normal power, thus realizing a variety of heating modes for the electric heating tube, making the electric heating tube suitable for the heating needs of large wind tunnel warm fields, and improving the applicability of the electric heating tube.

[0009] Optionally, a plurality of mounting grooves are formed on the mounting block, and the plurality of mounting grooves are evenly distributed circumferentially around the axis of the mounting tube. The heating wire is arranged in a U shape and is installed between two relative mounting grooves of the mounting block.

[0010] By adopting the above technical solution, when the large wind tunnel warm field is working, the electric heating tube will be affected by vibration, and the heating wire needs to be stably installed to reduce the possibility of short circuit of the heating wire. The staff set up the installation groove so that the heating wire can be stably installed in a set of installation blocks, reducing the possibility of the heating wire being offset by vibration and causing short circuit of the heating wire.

[0011] Optionally, the portion of the heating wire in the mounting groove is arranged in an S shape.

[0012] By adopting the above technical solution, the heating wire is arranged in an S shape, so that the length of the heating wire is increased within a unit distance of the electric heating tube, so that the electric heating tube can generate more heat within a unit distance, thereby improving the heating effect of the heating wire.

[0013] Optionally, the bottom wall of the mounting groove is arranged in an arc shape, and the heating wire is in contact with the bottom wall of the mounting groove.

[0014] By adopting the above technical solution, the staff fits the heating wire to the bottom wall of the installation groove, thereby limiting a group of installation blocks, reducing the possibility of offset or deflection between two adjacent installation blocks, and also making the installation of the heating wire more stable.

[0015] Optionally, the mounting groove is filled with a heat-conductive filler for transferring heat, the heat-conductive filler covers the heating wire, and the mounting block is made of a heat-conductive material.

[0016] By adopting the above technical solution, the staff fills the installation groove with thermal conductive filler and uses the installation block to assist in heat conduction, so that the heat generated in a group of installation blocks is more uniform.

[0017] Optionally, the partition block is a polygonal block, and a plurality of filler gaps are left between the partition block and the inner wall of the mounting tube, and the filler gaps are aligned with the mounting grooves.

[0018] By adopting the above technical solution, when filling the thermal conductive filler, the staff can pass the thermal conductive filler through the filler gap so that the thermal conductive filler can smoothly enter the installation groove, which provides convenience for filling the thermal conductive filler.

[0019] Optionally, one end of the partition block is connected to a plurality of positioning flanges, and the other end of the partition block is provided with a positioning groove matching the positioning flanges. When the partition blocks are installed, the positioning flange on one partition block is embedded in the positioning groove on another partition block.

[0020] By adopting the above technical solution, the staff uses the cooperation of the positioning flange and the positioning groove to limit the installation direction of the partition block, thereby reducing the possibility of displacement or deflection of two adjacent partition blocks in a vibration environment.

[0021] Optionally, the other end of the mounting tube is connected to an insulating cover, the insulating cover abuts against the partition block, and the wiring head is provided with a connector connected to one end of the mounting tube.

[0022] By adopting the above technical solution, when assembling the installation tube, the staff uses the connecting piece to connect one end of the installation tube, connects the installation tube to the terminal head, and cooperates with the insulating cover to resist the partition block, thereby realizing the installation of several groups of partition blocks and installation blocks.

[0023] Optionally, the connecting piece is a connecting sleeve, which is sleeved on the wiring head, and a limiting step is connected to the wiring head. One end of the mounting tube is sleeved on the wiring head and abuts against the limiting step. One end of the connecting piece abuts against the limiting step, and the outer diameter of the limiting step is smaller than the inner diameter of the connecting piece. The connecting piece and the mounting tube are connected by a tube shrinking machine.

[0024] By adopting the above technical solution, when installing the terminal head, the staff will press one end of the installation tube against the limiting step, and use the tube shrinking machine to extrude the connecting piece so that the connecting piece is squeezed against one end of the installation tube, and the connecting piece and the installation tube are connected by the tube shrinking process, thereby realizing the installation of the terminal head.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] 1. The staff uses the staggered arrangement of the installation blocks and the separation blocks to separate the several heating wires in the length direction of the installation tube. The staff can then energize the conductive rods corresponding to the positions of the heating wires according to the needs to make the electric heating tube generate heat locally. At the same time, the staff can also connect several conductive rods in parallel to increase the heating power of the electric heating tube, or connect several conductive rods in series to make the electric heating tube heat at normal power, thus realizing the diversity of heating modes of the electric heating tube, making the electric heating tube suitable for the heating needs of the warm field of a large wind tunnel, and improving the applicability of the electric heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the electric heating tube in the embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view used to illustrate the terminal head structure in the embodiment of the present application.

[0029] Figure 3 It is a cross-sectional view used to reflect the internal structure of the installation tube in the embodiment of the present application.

[0030] Figure 4 It is a cross-sectional view used to illustrate the filler gap structure in the embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the structure of the partition block in the embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the installation of the mounting block, the conductive rod and the heating wire in the embodiment of the present application.

[0033] Figure 7 It is a schematic diagram of the structure of the heating wire in the embodiment of the present application.

[0034] Explanation of the accompanying drawings: 1. Mounting tube; 11. Insulating cover; 2. Terminal block; 21. Limiting step; 22. Connector; 3. Heating wire; 4. Mounting block; 41. Mounting groove; 5. Partition block; 51. Positioning flange; 6. Conductive rod; 7. Temperature sensor. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 This application is described in further detail.

[0036] The present application embodiment discloses an electric heating pipe with independently controllable temperature zones. Figure 1 , Figure 2 and Figure 3The electric heating tube includes a mounting tube 1, a terminal head 2 and a heating wire 3. The mounting tube 1 is provided with openings at both ends, and a limiting step 21 is integrally formed on the terminal head 2. A connecting piece 22 is provided on the terminal head 2, and the connecting piece 22 is a connecting sleeve, and the connecting piece 22 is sleeved on the terminal head 2. One end of the mounting tube 1 is sleeved on the terminal head 2 and abuts against one end of the limiting step 21. The other end of the connecting piece 22 abuts against the limiting step 21 and is connected to one end of the mounting tube 1 through a tube shrinking machine.

[0037] Reference Figure 3 , Figure 4 and Figure 5 , several groups of mounting blocks 4 and dividing blocks 5 are arranged in the mounting tube 1. In this embodiment, three groups are taken as an example. One group of mounting blocks 4 and one group of dividing blocks 5 are arranged alternately. Both the mounting blocks 4 and the dividing blocks 5 are made of heat-conducting materials, such as magnesium oxide ceramic materials. In this embodiment, the mounting blocks 4 and the dividing blocks 5 are both regular hexagons. For example, six filler gaps are arranged between the dividing blocks 5 and the inner wall of the mounting tube 1. One end of the dividing block 5 is integrally formed with several positioning flanges 51, and the other end of the dividing block 5 is provided with a positioning groove corresponding to the position of the positioning flange 51. When installing the dividing block 5, the positioning flange 51 on one dividing block 5 is embedded in the positioning groove on the other dividing block 5.

[0038] Reference Figure 4 , Figure 6 and Figure 7 The mounting block 4 is provided with a plurality of mounting grooves 41. Six mounting grooves 41 are used as an example in this embodiment. The bottom wall of the mounting groove 41 is arranged in an arc shape, and the mounting groove 41 is aligned with the filler gap. The heating wire 3 is arranged in a U shape, and the heating wire 3 is installed between two mounting grooves 41 arranged opposite to each other. The heating wire 3 part located in the mounting groove 41 is arranged in an S shape, and the heating wire 3 fits the bottom wall of the mounting groove 41. The three heating wires 3 are evenly distributed around the axis of the mounting tube 1. The heating wire 3 fits the bottom wall of the mounting groove 41, so that a group of mounting blocks 4 are aligned and installed.

[0039] Reference Figure 3 and Figure 6 Conductive rods 6 are provided at both ends of the heating wire 3. A connecting groove is opened in the conductive rod 6. The heating wire 3 is welded in the connecting groove. The conductive rod 6 passes through the mounting block 4 and the partition block 5 and is fixedly connected to the terminal head 2.

[0040] Reference Figure 3 The other end of the mounting tube 1 is fixedly connected with an insulating cover 11 , which is arranged in a hollow hemispherical shape and abuts against the partition block 5 .

[0041] Reference Figure 3 In order to dissipate the heat in a set of mounting blocks 4 , the mounting groove 41 is filled with a thermally conductive filler. In this embodiment, boron nitride is used as an example, and the thermally conductive filler covers the heating wire 3 .

[0042] Reference Figure 2 In order to further improve the safety of the electric heating tube, a temperature sensor 7 is installed between the partition block 5 and the terminal head 2, and the temperature sensor 7 is used to monitor the temperature inside the electric heating tube.

[0043] The implementation principle of an electric heating tube with independently controllable temperature zones in an embodiment of the present application is as follows: when installing the electric heating tube, the staff installs the heating wire 3 in two relatively arranged installation grooves 41, welds the heating wire 3 to the connecting groove of the conductive rod 6, and then installs the partition block 5, passes the conductive rod 6 through the partition block 5 and the installation block 4, installs three groups of installation blocks 4 and partition blocks 5, welds the insulating cover 11 at the other end of the installation tube 1, sleeves the installation tube 1 on the partition block 5 and the installation block 4, and presses against the limiting step 21, the insulating cover 11 contacts the partition block 5, and finally uses a tube shrinking machine to extrude the connecting piece 22 to connect the connecting piece 22 to one end of the installation tube 1, thereby realizing the installation of the electric heating tube.

[0044] The staff uses the staggered arrangement of the mounting blocks 4 and the dividing blocks 5 to separate the plurality of heating wires 3 in the length direction of the mounting tube 1. The staff can then energize the conductive rods 6 corresponding to the positions of the heating wires 3 as required, so that the electric heating tube generates heat locally. At the same time, the staff can adjust the installation positions of the mounting blocks 4 and the dividing blocks 5 in the mounting tube 1 according to the restrictions of the on-site conditions, so that the electric heating tube can better cope with the complex heating position restrictions on site. The staff can also connect a plurality of conductive rods 6 in parallel to increase the heating power of the electric heating tube, or connect a plurality of conductive rods 6 in series to heat the electric heating tube at normal power, thereby realizing a variety of heating modes for the electric heating tube, making the electric heating tube suitable for the heating needs of a large wind tunnel warm field, and improving the applicability of the electric heating tube.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric heating tube with independently controllable temperature zones, characterized in that: The invention comprises a mounting tube (1), a terminal head (2) and a heating wire (3), wherein the terminal head (2) is mounted on one end of the mounting tube (1), and a plurality of groups of mounting blocks (4) and partition blocks (5) are placed in the mounting tube (1), wherein the mounting blocks (4) and the partition blocks (5) are arranged in a staggered manner, and a heating wire (3) is mounted on each group of mounting blocks (4), and the plurality of heating wires (3) are evenly distributed around the axis of the mounting tube (1), and a conductive rod (6) is connected to the end of the heating wire (3), and the conductive rod (6) is connected to the terminal head (2).

2. The temperature zone independently controllable electric heating tube according to claim 1, characterized in that: The mounting block (4) is provided with a plurality of mounting grooves (41), the plurality of mounting grooves (41) being evenly distributed circumferentially around the axis of the mounting tube (1), and the heating wire (3) being arranged in a U shape and being installed between two opposite mounting grooves (41) of the mounting block (4).

3. The temperature zone independently controllable electric heating tube according to claim 2, characterized in that: The portion of the heating wire (3) within the installation groove (41) is arranged in an S shape.

4. The temperature zone independently controllable electric heating tube according to claim 3, characterized in that: The bottom wall of the installation groove (41) is arranged in an arc shape, and the heating wire (3) fits the bottom wall of the installation groove (41).

5. The temperature zone independently controllable electric heating tube according to claim 2, characterized in that: The installation groove (41) is filled with a heat-conducting filler for transferring heat, the heat-conducting filler covers the heating wire (3), and the installation block (4) is made of a heat-conducting material.

6. The temperature zone independently controllable electric heating tube according to claim 5, characterized in that: The partition block (5) is a polygonal block, and a plurality of filler gaps are left between the partition block (5) and the inner wall of the mounting tube (1), and the filler gaps are aligned with the mounting grooves (41).

7. The temperature zone independently controllable electric heating tube according to claim 6, characterized in that: One end of the partition block (5) is connected to a plurality of positioning flanges (51), and the other end of the partition block (5) is provided with a positioning groove matching the positioning flanges (51); when the partition block (5) is installed, the positioning flange (51) on one partition block (5) is embedded in the positioning groove on another partition block (5).

8. The temperature zone independently controllable electric heating tube according to claim 1, characterized in that: The other end of the mounting tube (1) is connected to an insulating cover (11), the insulating cover (11) abuts against the partition block (5), and the terminal head (2) is provided with a connecting piece (22) connected to one end of the mounting tube (1).

9. The temperature-zoned independently controllable electric heating tube according to claim 8, characterized in that: The connecting piece (22) is a connecting sleeve, and the connecting piece (22) is sleeved on the wiring head (2). The wiring head (2) is connected to a limiting step (21). One end of the mounting tube (1) is sleeved on the wiring head (2) and contacts the limiting step (21). One end of the connecting piece (22) contacts the limiting step (21), and the outer diameter of the limiting step (21) is smaller than the inner diameter of the connecting piece (22). The connecting piece (22) and the mounting tube (1) are connected via a tube shrinking machine.

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