Explosion-proof electric heater with good heat conduction effect and assembly method thereof

Abstract

The invention relates to the technical field of heaters, in particular to an anti-explosion electric heater good in heat conduction effect and an assembling method thereof.The anti-explosion electric heater comprises a connecting pipe, a heating cavity is formed in the connecting pipe, and a first ceramic pipe is arranged in the heating cavity; the second ceramic tube is arranged in the first ceramic tube; a plurality of groups of strip-shaped grooves, wherein first locking holes are formed in the strip-shaped grooves; the spiral heating wire is arranged on the second ceramic tube; the guide structure can guide the spiral heating wire to move along the strip-shaped groove; the locking structure can enable the locking part to be inserted into the first locking hole; the axial connecting mechanism comprises an axial connecting assembly, an elastic traction assembly and a rotating sleeve, the axial connecting assembly can enable the first guide part and the second ceramic tube to be axially locked, and the rotating sleeve can drive the elastic traction assembly to act; and the axial connecting assembly is in contact with the axial locking state of the first guide piece and the second ceramic tube, so that the spiral heating wire is conveniently mounted.

Description

Technical Field

[0001] The invention relates to the technical field of heaters, in particular to an explosion-proof electric heater with good heat conduction effect and an assembly method thereof. Background Art

[0002] Now the electric heater is a device that converts electrical energy into thermal energy to achieve electric heating. The heating mechanism generally utilizes the Joule effect of electric current, and the heat generated when the current passes through the resistive heating material is used to heat the material.

[0003] Traditional electric heaters on the market all use resistance wires placed in metal tubes, and then magnesium powder is filled in the metal tubes to achieve insulation between the resistance wires and the metal tubes. In the application scenario of traditional heating tubes, the resistance wire transfers heat to the magnesium powder, which transfers heat to the heating tube wall, and then from the heating tube wall to the heating medium. During use, there is a lag in temperature feedback.

[0004] Moreover, during the production process, when the resistance wire is assembled in the tube, it cannot be observed with the naked eye and can only be inspected by X-ray after the assembly is completed. Moreover, the defective heating tube can only be scrapped and cannot be reversed, resulting in serious production waste. Summary of the invention

[0005] The object of the present invention is to provide an explosion-proof electric heater with good thermal conductivity and an assembly method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: An explosion-proof electric heater with good thermal conductivity, comprising: A connecting pipe, wherein a heating cavity is formed in the connecting pipe, and a first ceramic tube coaxial with the connecting pipe is arranged in the heating cavity; a second ceramic tube, detachably mounted in the first ceramic tube; A plurality of groups of strip grooves, wherein the plurality of groups of strip grooves are equidistantly arranged on the inner wall of the first ceramic tube in a circumferential manner, and a first locking hole penetrating the inside and outside of the first ceramic tube is arranged in the strip grooves; A spiral heating wire is arranged on the second ceramic tube and is in contact with the inner wall of the first ceramic tube; A guide structure connected to the second ceramic tube, the guide structure comprising a first guide member and a second guide member, the first guide member and the second guide member being capable of guiding the spiral heating wire to move along the strip-shaped groove; a locking structure, disposed between the first guide and the second ceramic tube and formed with a locking portion, wherein the locking structure enables the locking portion to be inserted into the first locking hole when the second ceramic tube rotates; An axial connection mechanism is arranged between the second guide member and the second ceramic tube. The axial connection mechanism includes an axial connection component, an elastic pulling component and a rotating sleeve. The axial connection component can axially lock the first guide member and the second ceramic tube. The rotating sleeve can drive the elastic pulling component to operate, so that the axial connection component contacts the axial locking state of the first guide member and the second ceramic tube.

[0007] As a further solution of the present invention: the first guide member is rotatably connected to the second ceramic tube; The locking structure comprises a plurality of groups of slide grooves on the first guide member which are equidistantly arranged in a circumference, a slider is slidably installed in the slide groove, the slider is connected to the locking portion, and an engaging shaft is arranged on the slider; The locking structure further comprises a driving groove arranged at the end of the second ceramic tube, and the engaging shaft can slide in the driving groove.

[0008] As a further solution of the present invention: the driving groove includes an arc groove provided at the end of the second ceramic tube and an inclined groove connected to the arc groove, the center of the arc groove is concentric with the center of the second ceramic tube, and the distance between the inclined groove and the center of the second ceramic tube gradually shortens along a direction away from the arc groove; When the second ceramic tube rotates, the fitting shaft can be moved along the arc groove and the inclined groove, so that the locking portion is inserted into the first locking hole.

[0009] As a further solution of the present invention: the rotating sleeve is rotatably connected to the second ceramic tube, and the rotating sleeve is rotatably connected to the second guide member; The elastic traction assembly comprises a follower slidably sleeved on the second ceramic tube, and the follower is connected to the rotating sleeve via a limiting structure; The end of the second ceramic tube is also sleeved with a cylindrical spring, one end of the cylindrical spring is connected to the follower, and the other end is connected to the second guide; The elastic traction assembly also includes an abutment sleeve connecting the follower and the second guide member.

[0010] As a further solution of the present invention: the limiting structure includes a plurality of groups of limiting blocks equidistantly arranged on the follower and a plurality of groups of limiting grooves arranged on the rotating sleeve, and the limiting grooves are slidably connected to the limiting blocks.

[0011] As a further solution of the present invention: the abutment kit includes a plurality of abutment shafts equidistantly arranged on the follower and a plurality of arc-shaped plates equidistantly arranged on the second guide, wherein a trigger groove is formed in the arc-shaped plate, and the abutment shaft can slide in the trigger groove; A first inclined surface and a second inclined surface are provided on a side of the trigger groove away from the second guide member, and a protrusion is formed at a connection between the first inclined surface and the second inclined surface.

[0012] As a further solution of the present invention: the axial connection assembly includes a connection piece slidably sleeved on the second ceramic tube and a second locking hole provided on the first guide piece, the connection piece is provided with a locking rod, and the locking rod can pass through the guide hole provided along the length direction of the second ceramic tube; When the locking rod is inserted into the second locking hole, the second ceramic tube and the first guide member can be axially locked; The axial connection assembly also includes a differential structure connecting the follower and the connection member.

[0013] As a further solution of the present invention: the differential structure includes an arc-shaped through hole provided on the connecting member and a groove wheel rotatably connected to the follower, and the groove wheel can roll in the arc-shaped through hole.

[0014] A method for assembling an explosion-proof electric heater with good thermal conductivity as described above comprises the following steps: Step 1: placing the first guide member into the strip-shaped groove, and pushing the second ceramic tube to move toward the inside of the first ceramic tube; Step 2: Rotate the rotating sleeve to activate the elastic traction assembly; Step 3: The elastic traction component drives the axial connection component to move, so that the axial locking between the first guide member and the second ceramic tube is released; Step 4: The elastic traction component continues to move, causing the second ceramic tube to rotate, and under the action of the locking structure, the locking portion can be inserted into the first locking hole, thereby completing the installation of the second ceramic tube and the spiral heating wire.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The spiral heating wire is provided so that the spiral heating wire can directly contact the air introduced into the heating cavity to perform heat exchange, and magnesium powder is not required to transfer heat, so that the heating effect is better, the heating speed is faster, and the temperature control accuracy is higher, and a zero lag effect of temperature control can be achieved; By providing the guide structure and the strip groove, under the action of the first guide member and the second guide member, on the one hand, a guiding and limiting effect can be generated on the spiral heating wire when the second ceramic tube and the spiral heating wire are inserted into the first ceramic tube, so that the outer protrusion of the spiral heating wire can face the strip groove, so as to reduce the friction between the spiral heating wire and the inner wall of the first ceramic tube during the installation process, ensure the structural completeness of the spiral heating wire, and avoid excessive wear of the spiral heating wire. On the other hand, the installed spiral heating wire can be coaxial with the first ceramic tube, and the protruding position of the spiral heating wire can fit with the inner wall of the first ceramic tube, so that the heat on the spiral heating wire can be evenly transferred to the first ceramic tube, thereby improving the uniformity of heat exchange between the gas and the spiral heating wire and the first ceramic tube, and improving the heating effect; By setting the locking structure, when the second ceramic tube is rotated, the locking portion can be inserted into the first locking hole to realize the locking of the first guide member and the first ceramic tube. At this time, it can be prevented that the first guide member slides relative to the first ceramic tube, causing the second guide member to slip off the first ceramic tube, resulting in non-coaxial phenomenon between the spiral heating wire and the first ceramic tube, thereby improving the stability of the first guide member, the spiral heating wire and the second guide member in the assembled state, and further ensuring the heating effect; By setting up the axial connection mechanism, when the rotating sleeve is rotated, the locking rod can be pulled, so that the locking rod can be separated from the second locking hole, so as to release the axial locking between the first guide member and the second ceramic tube, and when the rotating sleeve continues to rotate, the second ceramic tube is rotated, and the locking part is driven to be inserted into the first locking hole, so that the axial locking of the first guide member and the spiral heating wire can be carried out together with the locking distribution of the first guide member and the first ceramic tube, thereby improving the connection stability between the second ceramic tube, the spiral heating wire and the first ceramic tube in the assembled state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0017] Figure 2 This is a schematic structural diagram of an explosion-proof electric heater with good thermal conductivity after the insulation layer is removed.

[0018] Figure 3 The present invention is a cross-sectional view of an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0019] Figure 4 A side view of a spiral heating wire and a first ceramic tube in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0020] Figure 5This is a schematic diagram of the internal structure of the first ceramic tube in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0021] Figure 6 for Figure 5 A magnified view of the structure at center.

[0022] Figure 7 This is a structural explosion diagram of a locking structure in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0023] Figure 8 This is a structural schematic diagram of another angle of the locking structure in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0024] Fig. 9 for Figure 5 A magnified view of the structure at point B.

[0025] Fig.10 The present invention is a structural schematic diagram of an axial connection mechanism in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0026] Fig.11 This is a structural explosion diagram of the axial connection mechanism in an embodiment of an explosion-proof electric heater with good thermal conductivity.

[0027] Fig.12 A diagram showing two positions of an abutment shaft in one embodiment of an explosion-proof electric heater with good thermal conductivity.

[0028] In the figure: 1. spiral heating wire; 2. connecting tube; 3. thermocouple; 4. first ceramic tube; 401. strip groove; 402. first locking hole; 5. second ceramic tube; 501. arc groove; 502. inclined groove; 503. guide hole; 6. insulation layer; 7. cover plate; 8. first guide member; 801. slide groove; 802. second locking hole; 9. slider; 901. locking part; 902. engaging shaft; 10. second guide member; 11. rotating sleeve; 1101. limit groove; 12. follower; 1201. limit block; 13. abutting shaft; 14. arc plate; 1401. first inclined surface; 1402. second inclined surface; 1403. protrusion; 15. columnar spring; 16. groove wheel; 17. connecting member; 1701. arc through hole; 18. locking rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0031] See also Figure 1 to Figure 12 In an embodiment of the present invention, an explosion-proof electric heater with good thermal conductivity includes: a connecting tube 2, a second ceramic tube 5, a plurality of groups of strip grooves 401, a spiral heating wire 1, a guiding structure, a locking structure and an axial connecting mechanism.

[0032] A heating cavity is formed in the connecting tube 2, and a first ceramic tube 4 coaxial with the connecting tube 2 is arranged in the heating cavity. A heat preservation layer 6 is also arranged outside the connecting tube 2, and a cover plate 7 is arranged at the end of the connecting tube 2. Furthermore, the connecting tube 2 is formed by connecting two sections of tubular structures, and the two sections of tubular structures are connected by bolts, so as to facilitate the installation of the second ceramic tube 5 and the spiral heating wire 1 after disassembly; The second ceramic tube 5 is detachably installed in the first ceramic tube 4, and a thermocouple 3 is arranged in the first ceramic tube 4. The thermocouple 3 controls the heating power of the spiral heating wire 1 by detecting the temperature change of the gas, so that the gas can be stably at the target temperature; A plurality of groups of the strip-shaped grooves 401 are equidistantly arranged on the inner wall of the first ceramic tube 4 in a circumferential manner, and a first locking hole 402 penetrating the inside and outside of the first ceramic tube 4 is arranged in the strip-shaped grooves 401; The spiral heating wire 1 is arranged on the second ceramic tube 5 and fits with the inner wall of the first ceramic tube 4. When working, the spiral heating wire 1 can directly contact the air introduced into the heating cavity, so as to perform heat exchange, so that the heating effect is better, the heating speed is faster, and the temperature control accuracy is higher, and the effect of zero lag can be achieved. Specifically, the side view of the spiral heating wire 1 is a hexagonal structure, and at this time, the side view of the spiral heating wire 1 can be regarded as having six groups of external protrusions; The guide structure is connected to the second ceramic tube 5 , and includes a first guide member 8 and a second guide member 10 . The first guide member 8 and the second guide member 10 can guide the spiral heating wire 1 to move along the strip groove 401 .

[0033] In the initial state, under the action of the axial connecting mechanism, the first guide member 8, the second ceramic tube 5 and the second guide member 10 are in an axially locked state, so that during installation, when the first guide member 8 is inserted into the strip groove 401, the first guide member 8 can guide the protruding position of the spiral heating wire 1 to face the strip groove 401, so that in the process of inserting the spiral heating wire 1 into the first ceramic tube 4, the friction between the spiral heating wire 1 and the inner wall of the first ceramic tube 4 can be reduced, thereby avoiding the wear of the spiral heating wire 1 caused by the friction between the spiral heating wire 1 and the first ceramic tube 4.

[0034] And when the first guide member 8 moves to the end of the stroke, the second guide member 10 just moves to the end of the first ceramic tube 4 and is also inserted into the strip groove 401, so that under the action of the first guide member 8 and the second guide member 10, the second ceramic tube 5, the spiral heating wire 1 and the first ceramic tube 4 can be in a coaxial state, thereby improving the uniformity of the gas entering the first ceramic tube 4 and exchanging heat with the spiral heating wire 1, and when the second ceramic tube 5 rotates, the spiral heating wire 1 connected thereto will also rotate accordingly until the spiral heating wire 1 fits against the inner wall of the first ceramic tube 4. At this time, the heat on the spiral heating wire 1 can be evenly transferred to the first ceramic tube 4, further improving the uniformity of gas heating and the heating effect.

[0035] Through the above-mentioned arrangement, under the action of the first guide member 8 and the second guide member 10, on the one hand, a guiding and limiting effect can be generated on the spiral heating wire 1 when the second ceramic tube 5 and the spiral heating wire 1 are inserted into the first ceramic tube 4, so that the outer protrusion of the spiral heating wire 1 can face the strip groove 401, so as to reduce the friction between the spiral heating wire 1 and the inner wall of the first ceramic tube 4 during the installation process, ensure the structural completeness of the spiral heating wire 1, and avoid excessive wear of the spiral heating wire 1. On the other hand, the installed spiral heating wire 1 can be coaxial with the first ceramic tube 4, and the protruding position of the spiral heating wire 1 can fit with the inner wall of the first ceramic tube 4, so that the heat on the spiral heating wire 1 can be evenly transferred to the first ceramic tube 4, thereby improving the uniformity of heat exchange between the gas and the spiral heating wire 1 and the first ceramic tube 4, and improving the heating effect.

[0036] See also Figure 6~Figure 8 The locking structure is disposed between the first guide member 8 and the second ceramic tube 5 and is formed with a locking portion 901. The locking structure can insert the locking portion 901 into the first locking hole 402 when the second ceramic tube 5 rotates; The first guide member 8 is rotatably connected to the second ceramic tube 5, and the locking structure includes a plurality of slide grooves 801 arranged equidistantly on the first guide member 8, a slider 9 is slidably installed in the slide groove 801, the slider 9 is connected to the locking portion 901, and an engaging shaft 902 is arranged on the slider 9; The locking structure further comprises a driving groove arranged at the end of the second ceramic tube 5, the engaging shaft 902 can slide in the driving groove, the driving groove comprises a circular arc groove 501 arranged at the end of the second ceramic tube 5 and an inclined groove 502 connected to the circular arc groove 501, the center of the circular arc groove 501 is concentric with the center of the second ceramic tube 5, and the distance between the inclined groove 502 and the center of the second ceramic tube 5 gradually shortens along the direction away from the circular arc groove 501; When the second ceramic tube 5 rotates, the engaging shaft 902 can be moved along the arc groove 501 and the inclined groove 502 , so that the locking portion 901 is inserted into the first locking hole 402 .

[0037] In the initial state, the engaging shaft 902 is at the end of the inclined groove 502 away from the arc groove 501. At this time, the end of the locking portion 901 away from the slider 9 is coplanar with the side wall of the first guide member 8, so that when the first guide member 8 is inserted into the strip groove 401, no interference will occur. When the first guide member 8 moves to the end of the stroke and the second guide member 10 is placed in the first ceramic tube 4, the second ceramic tube 5 is rotated to enable the engaging shaft 902 to move along the inclined groove 502 and the arc groove 501 in turn. When the engaging shaft 902 moves along the inclined groove 502, the engaging shaft 902 The shaft 902 can drive the slider 9 to move along the length direction of the slide groove 801, so that the locking part 901 can be inserted into the first locking hole 402, thereby realizing the locking of the first guide member 8 and the first ceramic tube 4 to prevent the first guide member 8 from sliding relative to the first ceramic tube 4 during use, causing the second guide member 10 to slip off the first ceramic tube 4, resulting in non-coaxiality between the spiral heating wire 1 and the first ceramic tube 4, thereby improving the stability of the first guide member 8, the spiral heating wire 1 and the second guide member 10 in the assembled state.

[0038] Furthermore, when the interlocking shaft 902 moves into the circular arc groove 501, since the circular arc groove 501 is coaxial with the second ceramic tube 5, if the slider 9 is subjected to a reverse force and the interlocking shaft 902 acts on the side wall of the circular arc groove 501, the second ceramic tube 5 will not be reversed, thereby further improving the stability of the first guide member 8, the spiral heating wire 1 and the second guide member 10 in the assembled state.

[0039] Through the above arrangement, when the second ceramic tube 5 is rotated, the locking portion 901 can be inserted into the first locking hole 402 to achieve locking of the first guide member 8 and the first ceramic tube 4. At this time, it can prevent the first guide member 8 from sliding relative to the first ceramic tube 4, causing the second guide member 10 to slip off the first ceramic tube 4, resulting in non-coaxiality between the spiral heating wire 1 and the first ceramic tube 4, thereby improving the stability of the first guide member 8, the spiral heating wire 1 and the second guide member 10 in the assembled state, and further ensuring the heating effect.

[0040] See also Fig.11 The axial connection mechanism is arranged between the second guide 10 and the second ceramic tube 5, and the axial connection mechanism includes an axial connection component, an elastic pulling component and a rotating sleeve 11. The axial connection component can axially lock the first guide 8 and the second ceramic tube 5. The rotating sleeve 11 can drive the elastic pulling component to move, so that the axial connection component contacts the axial locking state of the first guide 8 and the second ceramic tube 5; The axial connection assembly includes a connection piece 17 slidably mounted on the second ceramic tube 5 and a second locking hole 802 arranged on the first guide piece 8, and a locking rod 18 is arranged on the connection piece 17, and the locking rod 18 can pass through the guide hole 503 arranged along the length direction of the second ceramic tube 5; When the locking rod 18 is inserted into the second locking hole 802, the second ceramic tube 5 and the first guide member 8 can be axially locked; The axial connection assembly further includes a differential structure connecting the follower 12 and the connection member 17 .

[0041] In the initial state, the locking rod 18 is in a state of passing through the guide hole 503 and inserted into the second locking hole 802. At this time, the first guide member 8 is in a state of axial locking with the second ceramic tube 5, so that when the first guide member 8 moves along the strip groove 401, it can have a limiting effect on the spiral heating wire 1 to prevent the two from rubbing in the process of injecting the spiral heating wire 1 into the first ceramic tube 4. When the first guide member 8 moves to the end of the stroke and the second guide member 10 also enters the strip groove 401, the rotating sleeve 11 is rotated. At this time, the axial connection component connected to the rotating sleeve 11 will be activated and pulled by the differential structure. The connecting piece 17 is connected to the second locking hole 802, so that the locking rod 18 can be separated from the second locking hole 802. At this time, the axial locking between the first guide piece 8 and the second ceramic tube 5 can be released, and when the connecting piece 17 is further rotated, the connecting piece 17 can drive the second ceramic tube 5 to rotate through the locking rod 18, so that the locking portion 901 can be inserted into the first locking hole 402, and the first guide piece 8 can be locked with the first ceramic tube 4, that is, the axial locking of the first guide piece 8 and the spiral heating wire 1 can be carried out together with the locking distribution of the first guide piece 8 and the first ceramic tube 4, which ensures that the spiral heating wire 1 will not wear and improves the stability of the first guide piece 8 after assembly.

[0042] See also Fig. 9 , Figure 11~Figure 12 The differential structure includes an arc-shaped through hole 1701 provided on the connecting member 17 and a groove wheel 16 rotatably connected to the follower 12, and the groove wheel 16 can roll in the arc-shaped through hole 1701; The rotating sleeve 11 is rotatably connected to the second ceramic tube 5, and the rotating sleeve 11 is rotatably connected to the second guide member 10; The elastic traction assembly includes a follower 12 slidably sleeved on the second ceramic tube 5, the follower 12 is connected to the rotating sleeve 11 via a limiting structure, the limiting structure includes a plurality of groups of limiting blocks 1201 equidistantly arranged on the follower 12 and a plurality of groups of limiting grooves 1101 arranged on the rotating sleeve 11, the limiting grooves 1101 are slidably connected to the limiting blocks 1201; The end of the second ceramic tube 5 is also sleeved with a cylindrical spring 15, one end of the cylindrical spring 15 is connected to the follower 12, and the other end is connected to the second guide 10; The elastic traction assembly further includes an abutment set connecting the follower 12 and the second guide 10, the abutment set including a plurality of abutment shafts 13 equidistantly arranged on the follower 12 and a plurality of arc plates 14 equidistantly arranged on the second guide 10, wherein a trigger groove is formed in the arc plate 14, and the abutment shaft 13 can slide in the trigger groove; A first inclined surface 1401 and a second inclined surface 1402 are disposed on a side of the triggering groove away from the second guide member 10 , and a protrusion 1403 is formed at a connection between the first inclined surface 1401 and the second inclined surface 1402 .

[0043] In the initial state, the cylindrical spring 15 is in a compressed state, and the abutment shaft 13 is in a state where the second inclined surface 1402 is away from the protrusion 1403 (see Fig.12 In this state, there is also a certain axial limiting force between the second guide member 10 and the second ceramic tube 5, so that there is a certain axial locking force between the first guide member 8, the second ceramic tube 5 and the second guide member 10.

[0044] When the second guide member 10 is also inserted into the strip groove 401, the rotating sleeve 11 is rotated. At this time, the rotating sleeve 11 can rotate relative to the second guide member 10. At the same time, under the action of the limit groove 1101 and the limit block 1201, the follower 12 will also rotate with the rotating sleeve 11, and the abutment shaft 13 can move along the second inclined surface 1402 toward the protrusion 1403 to further compress the columnar spring 15. At this time, the abutment shaft 13 can move toward the rotating sleeve 11 for a certain amount of stroke, thereby pulling the connecting member 17 to move through the groove wheel 16, and separating the locking rod 18 from the second locking hole 802, thereby releasing the axial locking of the first guide member 8 and the second ceramic tube 5. In this process, the groove wheel 16 moves along the arc The arc-shaped through hole 1701 moves, so that the second ceramic tube 5 does not rotate. When the abutment shaft 13 moves along the second inclined surface 1402 over the protrusion 1403, the groove wheel 16 abuts against the end of the arc-shaped through hole 1701. At the same time, the cylindrical spring 15 can drive the abutment shaft 13 to move along the first inclined surface 1401 by releasing elastic potential energy. At this time, the connecting member 17 will rotate with the follower 12 and, driven by the locking rod 18, the second ceramic tube 5 is rotated, so that the locking portion 901 can be inserted into the first locking hole 402, thereby realizing the locking between the first guide member 8 and the first ceramic tube 4, and improving the connection stability between the second ceramic tube 5, the spiral heating wire 1 and the first ceramic tube 4 in the assembled state.

[0045] Further, after the abutment shaft 13 moves past the protrusion 1403, when the engaging shaft 902 moves to the end of the arc groove 501, the second ceramic tube 5 stops rotating, and the abutment shaft 13 can only move a certain displacement along the first inclined surface 1401 (see Fig.12In this state, the locking rod 18 is still separated from the second locking hole 802, and the cylindrical spring 15 still exerts an elastic force on the abutment shaft 13, so that the abutment shaft 13 still has a tendency to move along the first inclined surface 1401. Under this tendency, the position stability of the follower 12 and the connecting member 17 can be improved, thereby ensuring that the connecting member 17 will not rotate in the opposite direction, and making the connection state between the locking portion 901 and the first locking hole 402 more stable.

[0046] Through the above-mentioned arrangement, when the rotating sleeve 11 is rotated, the locking rod 18 can be pulled, and the locking rod 18 can be separated from the second locking hole 802 to release the axial locking between the first guide member 8 and the second ceramic tube 5, and during the continuous rotation of the rotating sleeve 11, the second ceramic tube 5 is rotated, and the locking portion 901 is driven to be inserted into the first locking hole 402, so that the axial locking of the first guide member 8 and the spiral heating wire 1 can be carried out together with the locking distribution of the first guide member 8 and the first ceramic tube 4, thereby improving the connection stability between the second ceramic tube 5, the spiral heating wire 1 and the first ceramic tube 4 in the assembled state.

[0047] A method for assembling an explosion-proof electric heater with good thermal conductivity as described above comprises the following steps: Step 1: Place the first guide member 8 into the strip groove 401 and push the second ceramic tube 5 to move toward the inside of the first ceramic tube 4; Step 2: Rotate the rotating sleeve 11 to activate the elastic traction assembly; Step 3: The elastic traction component drives the axial connection component to move, so that the axial locking between the first guide member 8 and the second ceramic tube 5 is released; Step 4: The elastic traction component continues to move, causing the second ceramic tube 5 to rotate, and under the action of the locking structure, the locking portion 901 can be inserted into the first locking hole 402, thereby completing the installation of the second ceramic tube 5 and the spiral heating wire 1.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An explosion-proof electric heater with good thermal conductivity, comprising: A connecting tube (2), wherein a heating cavity is formed in the connecting tube (2), and a first ceramic tube (4) coaxial with the connecting tube (2) is arranged in the heating cavity; A second ceramic tube (5) detachably mounted inside the first ceramic tube (4); It is characterized by further comprising: A plurality of groups of strip grooves (401), the plurality of groups of strip grooves (401) being arranged equidistantly on the inner wall of the first ceramic tube (4) in a circumferential manner, and a first locking hole (402) penetrating the inside and outside of the first ceramic tube (4) being arranged in the strip grooves (401); A spiral heating wire (1) is arranged on the second ceramic tube (5) and is in contact with the inner wall of the first ceramic tube (4); a guide structure connected to the second ceramic tube (5), the guide structure comprising a first guide member (8) and a second guide member (10), the first guide member (8) and the second guide member (10) being capable of guiding the spiral heating wire (1) to move along the strip-shaped groove (401); a locking structure, arranged between the first guide member (8) and the second ceramic tube (5) and forming a locking portion (901), wherein the locking structure can enable the locking portion (901) to be inserted into the first locking hole (402) when the second ceramic tube (5) rotates; An axial connection mechanism is arranged between the second guide member (10) and the second ceramic tube (5), the axial connection mechanism comprising an axial connection component, an elastic pulling component and a rotating sleeve (11), the axial connection component can axially lock the first guide member (8) and the second ceramic tube (5), and the rotating sleeve (11) can drive the elastic pulling component to operate, so that the axial connection component contacts the first guide member (8) and the second ceramic tube (5) in an axially locked state.

2. The explosion-proof electric heater with good thermal conductivity according to claim 1, characterized in that: The first guide member (8) is rotatably connected to the second ceramic tube (5); The locking structure comprises a plurality of groups of slide grooves (801) on the first guide member (8) which are equidistantly arranged in a circumference, a slider (9) being slidably mounted in the slide groove (801), the slider (9) being connected to the locking portion (901), and a fitting shaft (902) being arranged on the slider (9); The locking structure further comprises a driving groove arranged at the end of the second ceramic tube (5), and the engaging shaft (902) is capable of sliding in the driving groove.

3. The explosion-proof electric heater with good thermal conductivity according to claim 2, characterized in that: The driving groove comprises an arc groove (501) arranged at the end of the second ceramic tube (5) and an inclined groove (502) connected to the arc groove (501), the center of the arc groove (501) is concentric with the center of the second ceramic tube (5), and the distance between the inclined groove (502) and the center of the second ceramic tube (5) gradually shortens along a direction away from the arc groove (501); When the second ceramic tube (5) rotates, the engaging shaft (902) can move along the arc groove (501) and the inclined groove (502), so that the locking portion (901) is inserted into the first locking hole (402).

4. The explosion-proof electric heater with good thermal conductivity according to claim 1, characterized in that: The rotating sleeve (11) is rotatably connected to the second ceramic tube (5), and the rotating sleeve (11) is rotatably connected to the second guide member (10); The elastic traction assembly comprises a follower (12) slidably mounted on the second ceramic tube (5), the follower (12) being connected to the rotating sleeve (11) via a limiting structure; The end of the second ceramic tube (5) is also sleeved with a cylindrical spring (15), one end of the cylindrical spring (15) is connected to the follower (12), and the other end is connected to the second guide (10); The elastic traction assembly also includes an abutment kit connecting the follower (12) and the second guide member (10).

5. The explosion-proof electric heater with good thermal conductivity according to claim 4, characterized in that: The limiting structure comprises a plurality of groups of limiting blocks (1201) arranged at equal intervals on the circumference of the follower (12) and a plurality of groups of limiting grooves (1101) arranged on the rotating sleeve (11), wherein the limiting grooves (1101) are slidably connected to the limiting blocks (1201).

6. The explosion-proof electric heater with good thermal conductivity according to claim 5, characterized in that: The abutment kit comprises a plurality of abutment shafts (13) equidistantly arranged on the follower (12) and a plurality of arc-shaped plates (14) equidistantly arranged on the second guide (10), wherein a trigger groove is formed in the arc-shaped plate (14), and the abutment shaft (13) is capable of sliding in the trigger groove; A first inclined surface (1401) and a second inclined surface (1402) are provided on a side of the trigger groove facing away from the second guide member (10), and a protrusion (1403) is formed at the connection between the first inclined surface (1401) and the second inclined surface (1402).

7. The explosion-proof electric heater with good thermal conductivity according to claim 4, characterized in that: The axial connection assembly comprises a connection piece (17) slidably mounted on the second ceramic tube (5) and a second locking hole (802) arranged on the first guide piece (8); a locking rod (18) is arranged on the connection piece (17); the locking rod (18) is capable of passing through a guide hole (503) arranged along the length direction of the second ceramic tube (5); When the locking rod (18) is inserted into the second locking hole (802), the second ceramic tube (5) and the first guide member (8) can be axially locked; The axial connection assembly also includes a differential structure connecting the follower (12) and the connection member (17).

8. The explosion-proof electric heater with good thermal conductivity according to claim 7, characterized in that: The differential structure comprises an arc-shaped through hole (1701) arranged on the connecting member (17) and a groove wheel (16) rotatably connected to the follower (12), and the groove wheel (16) is capable of rolling in the arc-shaped through hole (1701).

9. A method for assembling an explosion-proof electric heater with good thermal conductivity as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: placing the first guide member (8) into the strip-shaped groove (401), and pushing the second ceramic tube (5) to move toward the inside of the first ceramic tube (4); Step 2: rotating the rotating sleeve (11) to activate the elastic traction component; Step three: the elastic traction component drives the axial connection component to move, so that the axial locking between the first guide member (8) and the second ceramic tube (5) is released; Step 4: The elastic traction component continues to move, causing the second ceramic tube (5) to rotate, and under the action of the locking structure, the locking portion (901) can be inserted into the first locking hole (402), thereby completing the installation of the second ceramic tube (5) and the spiral heating wire (1).

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