CN111315052B

CN111315052B - Electric heating tube

Info

Publication number: CN111315052B
Application number: CN202010117146.XA
Authority: CN
Inventors: 李良锋; 沈婷; 王春辉; 张新; 吴清华; 吴卫; 郝兴胜
Original assignee: Tengze Electric Shanghai Co ltd
Current assignee: Tengze Electric Shanghai Co ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2022-01-25
Anticipated expiration: 2040-02-25
Also published as: CN111315052A

Abstract

The invention relates to an electric heating tube, which comprises a heating component and a heat dissipation component, wherein the heat dissipation component comprises a glass tube and a heat dissipation module made of metal, the heating component comprises a plurality of leads and heating wires arranged in the glass tube, two ends of each heating wire are electrically connected with the leads respectively, two ends of the glass tube are respectively provided with an insulating protection piece, the heat dissipation module is detachably fixed outside the glass tube, the leads are penetrated and sealed and fixed in the insulating protection pieces, the leads are connected with a power supply to heat the heating wires, one part of heat is conducted on the glass tube, the other part of heat can heat air in the glass tube, the heat on the glass tube can be dissipated to the outside air through a heat dissipation structure, the heat dissipation performance of the heat dissipation structure is better due to the higher heat conductivity coefficient of the metal, the problem of insufficient heat dissipation of the glass tube is effectively solved, and the structural strength of the glass tube can be enhanced by the heat dissipation structure arranged outside the glass tube, the reliability is improved.

Description

Electric heating tube

Technical Field

The invention relates to the technical field of heaters, in particular to an electric heating pipe.

Background

In modern life, a refrigerator becomes one of indispensable household appliances, a defrosting system is arranged in most refrigerators, and the heating pipe in the defrosting system is powered and heated by calculating the working period of a compressor, so that the defrosting function is realized.

The existing heating pipe is usually a single-layer glass heating pipe, and comprises a glass pipe, a heating wire inserted in the heating pipe, and bases at two ends. The base is internally provided with a through hole for connecting the heating wire and the lead, the periphery of the heating wire is wrapped with a glass tube, and the heating wire arranged in the glass tube penetrates through the base to be connected with the lead.

The above prior art solutions have the following drawbacks: when the single-layer glass heating pipe works, the heating wire can emit high heat, the heat can heat air in the glass pipe and the glass pipe, but the heat conductivity coefficient of the glass is lower, and the heat emission efficiency is not high.

Disclosure of Invention

In view of the defects of the prior art, one of the purposes of the invention is to provide an electric heating tube with good heat dissipation and high safety.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides an electric heating pipe, includes heating element, radiator unit includes glass pipe and the radiating module who is made by the metal, heating element includes many wires and sets up the intraductal heater of glass, the both ends of heater with respectively the wire electricity is connected, the both ends of glass pipe all are provided with insulating protection piece, radiating module can dismantle to be fixed the outside of glass pipe, the wire is worn to establish sealed the fixing in the insulating protection piece.

Through adopting above-mentioned technical scheme, connect the wire power, make the heater generate heat, heat some conduction is on the glass pipe, the air in the glass pipe can be heated to another part, in the middle of the air that heat accessible heat radiation structure on the glass pipe gived off the outside, because the coefficient of heat conductivity of metal is than higher, so heat radiation structure's heat dispersion is better, solved the not enough problem of glass pipe heat dissipation effectively, set up the structural strength of the heat radiation structure multiplicable glass pipe outside the glass pipe in addition, improved the reliability.

The present invention in a preferred example may be further configured to: the heat dissipation module comprises a spiral band-shaped heat dissipation band, and the heat dissipation band is sleeved on the peripheral surface of the outer side of the glass tube along the axis direction of the glass tube.

By adopting the technical scheme, the spiral heat dissipation belt can be stably wound and fixed on the glass tube, so that heat can be more reliably, stably and efficiently absorbed.

The present invention in a preferred example may be further configured to: the heat dissipation module comprises a flanging belt fixed on the inner ring edge of the heat dissipation belt, and the flanging belt and the heat dissipation belt are spirally screwed in the same direction.

Through adopting above-mentioned technical scheme, the direct contact area between multiplicable heat dissipation module of turn-ups area and the glass pipe strengthens heat-conducting ability, and the structural strength of heat dissipation module self is increased in the existence of turn-ups area, under this condition, even the glass pipe produces and breaks, also can not drop completely because of heat dissipation module's support, more can guarantee the heater in the glass pipe, can not easily sag outside the glass pipe and lead to the emergence of electrocuteeing or conflagration.

The present invention in a preferred example may be further configured to: the heat dissipation module comprises a plurality of heat dissipation sheets and a plurality of connecting bands, the heat dissipation sheets are provided with penetrating holes matched with the peripheral surfaces of the outer sides of the glass tubes, and the connecting bands are fixedly connected between the heat dissipation sheets.

Through adopting above-mentioned technical scheme, the heat conduction transmission on the glass pipe is strengthened to the heat dissipation thin slice, and then the heat of leading out the glass pipe surface better, reduces the surface temperature. The connecting band can strengthen the structural strength of the heat dissipation module, and can effectively protect and prevent the glass tube from safety accidents caused by the easy sagging of the hot wire after being broken by external force.

The present invention in a preferred example may be further configured to: the hole periphery of the through hole is fixedly connected with a flanging sheet, and the side face of the flanging sheet is abutted to the outer side face of the glass tube.

Through adopting above-mentioned technical scheme, turn-ups piece further increase its and the glass pipe between area of contact to promote its stability and heat conductivility, provide better protection for the glass pipe.

The present invention in a preferred example may be further configured to: a plurality of joint grooves have been seted up to the side of heat dissipation thin slice, the connecting band passes adjacent in proper order singly on the heat dissipation thin slice behind the joint groove, with joint groove chucking.

By adopting the technical scheme, the disassembly and assembly are convenient, and the maintenance operation is facilitated to be carried out quickly.

The present invention in a preferred example may be further configured to: the insulation protection member includes a rubber cap, a connection terminal, and a check valve assembly;

the heating wire is electrically connected with the lead through the connecting terminal, a wire hole is formed in the rubber cap, one end, far away from the heating wire, of the lead penetrates out of the rubber cap through the wire hole, and the lead is in interference fit with the wire hole;

the rubber cap is provided with an exhaust hole communicated with the glass tube;

the check valve assembly is detachably fixed on the exhaust hole and is used for limiting external air from entering the glass tube through the exhaust hole.

By adopting the technical scheme, when the electric heating pipe is electrified to work, the air in the glass pipe is heated to expand, the pressure rises, and when the pressure is greater than a certain threshold value, the valve body of the check valve assembly is opened, so that the gas in the glass pipe can be discharged, and the pressure in the glass pipe is reduced, so that the glass pipe is prevented from bursting or being damaged. When the pressure drop is reduced to a certain threshold value, the valve body of the one-way valve assembly is closed, so that external water vapor and the like are prevented from entering the glass tube, the corrosion to the heating wire is reduced, and the service life of the glass tube is prolonged.

The present invention in a preferred example may be further configured to: the check valve subassembly includes the valve body of being made by rubber, set up on the rubber cap with the mounting groove of exhaust hole intercommunication just is in the tank bottom of mounting groove forms the erection column, the erection column is kept away from the one end fixedly connected with overhead kick body of glass pipe, the valve body can be dismantled and connect on the erection column, the restriction of valve body the inside gas of glass pipe outwards moves.

By adopting the technical scheme, the barb body limits the position of the valve body, and the valve body limits the air flow in the exhaust hole.

The present invention in a preferred example may be further configured to: the check valve component comprises a valve outer cover, the valve outer cover is embedded and clamped and fixed in the mounting groove, the valve outer cover is provided with an air guide hole communicated with the exhaust hole, and the valve body is in one-way sealing with the air guide hole.

Through adopting above-mentioned technical scheme, make things convenient for check valve subassembly's installation and fixed.

The present invention in a preferred example may be further configured to: the valve body comprises a hemisphere and a positioning hole which is formed in one surface of the hemisphere and is used for the installation column to penetrate through, the positioning hole is far away from the inverted hook limiting groove in one surface of the hemisphere, and the inverted hook limiting groove is matched with the inverted hook body;

an annular air guide groove is formed in one surface of the hemispherical plane and is communicated with the air guide hole, and the other surface of the hemispherical plane is tightly abutted to the outer cover of the valve.

Through adopting above-mentioned technical scheme, when the intraductal atmospheric pressure of glass increased, the atmospheric pressure increase in the same air guide groove to can overcome hemisphere self elasticity with the planar one side edge jack-up of hemisphere, thereby with gas outgoing, the plane one side of hemisphere can seal the air guide hole after atmospheric pressure resumes, prevents that the outside air from getting into the glass pipe.

The present invention in a preferred example may be further configured to: the glass tube sealing device is characterized in that a sealing plug is arranged in the rubber cap in a sliding mode, a sealing rod is fixedly connected to one end of the sealing plug in an integrated mode, an air exhaust hole which is communicated with the outside and the glass tube is formed in the rubber cap, and the sealing rod is inserted and fixed in the air exhaust hole.

Through adopting above-mentioned technical scheme, when equipment electric heating pipe, can outwards rotate the sealing plug and make the sealing rod break away from the aspirating hole to make and bleed and external intercommunication. Then the vacuum pump connector is inserted into the air exhaust hole for air exhaust treatment, after air in the glass tube is exhausted, the pressure in the glass tube reaches a preset value, and then the sealing plug is rotated to enable the sealing rod to be inserted into the air exhaust hole to realize sealing. On one hand, the gas in the glass tube is prevented from damaging the glass tube or the rubber cap due to thermal expansion, and the moisture in the external air can be prevented from entering the glass tube to corrode the heating wire.

The present invention in a preferred example may be further configured to: the glass tube is characterized in that a fixing sheet is arranged below the glass tube, an installation groove for the fixing sheet to be embedded is formed in the edge of the heat dissipation sheet, and the two ends of the fixing sheet along the length direction face the glass tube and are inserted into the rubber cap after being bent.

Through adopting above-mentioned technical scheme for the radiating thin slice can not appear the pivoted condition on the glass pipe, and the both ends of stationary blade are buckled and have been avoided the radiating thin slice to appear gliding condition on the glass pipe simultaneously, have guaranteed the stability of product structure, have protected the glass pipe to a certain extent simultaneously.

The present invention in a preferred example may be further configured to: the insulating protection piece still includes one-way valve subassembly, one-way valve subassembly includes valve, inner cup, enclosing cover and spring, the one end and the enclosing cover fixed connection of spring, the other end and valve fixed connection, the one end of inner cup is fixed on the enclosing cover, the valve is kept away from the one end of spring with the exhaust hole butt.

By adopting the technical scheme, when the heater is electrified to work, the internal air is heated and expanded to generate pressure, the spring is compressed, and when the pressure reaches the set value of the valve, the valve is opened to discharge the internal air. The pressure inside the glass tube is reduced and the glass tube is prevented from being broken or other parts from being damaged. When the internal pressure is reduced and is lower than the set value of the valve, the spring naturally restores to drive the valve to close. Prevent the external water vapor and the like from entering the glass tube to corrode the heating wire and prolong the service life of the heating wire.

In summary, the invention includes at least one of the following beneficial technical effects:

the wire is connected with the power supply, the heating wire is made to generate heat, one part of heat is conducted on the glass tube, the other part of heat can heat the air in the glass tube, the heat on the glass tube can be dissipated to the outside through the heat dissipation structure, the heat conductivity coefficient of metal is higher, a new heat dissipation fin structure is optimally designed, the heat dissipation performance is better, the problem of insufficient heat dissipation of the glass tube is effectively solved, and therefore the heater surface temperature is lower under the condition of the same power density, the service life is longer, the heat utilization rate is higher (the heat efficiency is higher). And the heat radiation structure arranged outside the glass tube can improve the structural strength of the glass tube and improve the reliability.

Drawings

FIG. 1 is an overall structure diagram of a first embodiment of the present invention;

FIG. 2 is a partial sectional view of the first embodiment of the present invention;

FIG. 3 is an overall structural view of a second embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is an overall structural view of a third embodiment of the present invention;

FIG. 6 is an enlarged view of portion B of FIG. 5;

FIG. 7 is a partial sectional view of the fourth embodiment of the present invention;

FIG. 8 is an overall configuration diagram of a fifth embodiment of the present invention;

fig. 9 is a partial structural sectional view of fig. 8.

Reference numerals: 1. a heat generating component; 11. a wire; 12. a heater; 2. a heat dissipating component; 21. a glass tube; 22. a heat dissipation module; 221. a heat dissipation band; 222. edge turning is carried out; 223. a heat dissipating sheet; 2231. perforating holes; 2232. a clamping groove; 224. a connecting belt; 225. a flanging sheet; 3. an insulating protector; 31. a rubber cap; 311. an exhaust hole; 312. mounting grooves; 313. mounting a column; 314. an inverted hook body; 315. an air exhaust hole; 32. a connection terminal; 33. a one-way valve assembly; 331. a valve body; 3311. a hemisphere; 3312. positioning holes; 3313. a barb limiting groove; 3314. a gas guide groove; 332. a valve outer cover; 3321. an air vent; 4. a sealing plug; 41. a sealing rod; 5. a fixing sheet; 6. a one-way valve assembly; 61. an inner cover; 62. an outer cover; 63. a spring; 64. and (4) a valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1, an electric heating tube disclosed by the present invention includes a heating assembly 1 and a heat dissipation assembly 2, the heat dissipation assembly 2 includes a glass tube 21 and a heat dissipation module 22 made of metal, the heating assembly 1 includes a plurality of wires 11 and a heating wire 12 disposed in the glass tube 21, two ends of the heating wire 12 are electrically connected to the wires 11, two ends of the glass tube 21 are both provided with an insulation protection member 3, the heat dissipation module 22 is detachably fixed outside the glass tube 21, and the wires 11 are inserted, sealed and fixed in the insulation protection member 3.

When connecting wire 11 with the power, when making heater 12 generate heat, the heat that it sent partly can conduct on glass pipe 21, and the air in another part can heat glass pipe 21, because the coefficient of heat conductivity of metal is than higher, in the middle of the air that heat accessible heat radiation structure on the glass pipe 21 gived off the outside, can effectively solve glass pipe 21 not enough problem of heat dissipation, set up the structural strength of the heat radiation structure multiplicable glass pipe 21 outside glass pipe 21 in addition, improved the reliability.

The heat dissipation module 22 includes a spiral strip-shaped heat dissipation belt 221 and a flanging belt 222 fixed on an inner ring edge of the heat dissipation belt 221, the heat dissipation belt 221 is sleeved on an outer circumferential surface of the glass tube 21 along an axis direction of the glass tube 21, the spiral heat dissipation belt 221 can be stably wound and fixed on the glass tube 21, heat can be absorbed more reliably, stably and efficiently, and the spiral direction of the flanging belt 222 is the same as that of the heat dissipation belt 221. By such design, the flanging belt 222 can increase the direct contact area between the heat dissipation module 22 and the glass tube 21, enhance the heat conduction capability, and the existence of the flanging belt 222 increases the structural strength of the heat dissipation module 22 itself, in this case, even if the glass tube 21 is broken, the glass tube will not fall off completely due to the support of the heat dissipation module 22, and the heating wire 12 in the glass tube 21 can be ensured, and will not easily sag out of the glass tube 21 to cause electric shock or fire.

Referring to fig. 2, the check valve assembly 33 includes a valve body 331 made of rubber, the rubber cap 31 is provided with a mounting groove 312 communicated with the air vent 311, a mounting column 313 is formed at the bottom of the mounting groove 312, one end of the mounting column 313 far away from the glass tube 21 is fixedly connected with a barb 314, the valve body 331 is detachably connected to the mounting column 313, the valve body 331 limits the outward movement of the air in the glass tube 21, the position of the valve body 331 is limited by the barb 314, and the flow of the air in the air vent 311 is limited by the valve body 331.

Specifically, referring to fig. 2, the insulating protection member 3 includes a rubber cap 31, a connection terminal 32 and a check valve assembly 33, the heating wire 12 is electrically connected to the wire 11 through the connection terminal 32, a wire hole is formed in the rubber cap 31, one end of the wire 11, which is far away from the heating wire 12, penetrates out of the rubber cap 31 through the wire hole, the wire 11 and the wire hole are in interference fit, an exhaust hole 311 communicated with the glass tube 21 is formed in the rubber cap 31, and the check valve assembly 33 is detachably fixed to the exhaust hole 311 and used for limiting external air from entering the glass tube 21 through the exhaust hole 311.

When the electric heating tube is electrified to work, the air inside the glass tube 21 is heated to expand, the pressure rises, and when the pressure is greater than a certain threshold value, the valve body 331 of the check valve assembly 33 is opened, so that the gas in the glass tube 21 can be discharged, and the pressure inside the glass tube 21 is reduced, so that the glass tube 21 is prevented from bursting or being damaged. When the pressure drop is reduced to a certain threshold value, the valve body 331 of the check valve assembly 33 is closed, thereby preventing external moisture and the like from entering the glass tube 21, reducing the corrosion to the heating wire 12 and prolonging the service life of the heating wire.

The check valve assembly 33 comprises a valve outer cover 332, the valve outer cover 332 is embedded, clamped and fixed in the mounting groove 312, the valve outer cover 332 is provided with an air guide hole 3321 communicated with the exhaust hole 311, and the valve body 331 is used for sealing the air guide hole 3321 in a one-way mode, so that the check valve assembly 33 can be conveniently mounted and fixed.

The valve body 331 includes a hemisphere 3311, a positioning hole 3312 provided on one planar surface of the hemisphere 3311 for the mounting post 313 to pass through, a barb-limiting groove 3313 provided on one planar surface of the hemisphere 3311 away from the positioning hole 3312, the barb-limiting groove 3313 being matched with the barb 314, an annular air guiding groove 3314 provided on one planar surface of the hemisphere 3311, the air guiding groove 3314 being communicated with the air guiding hole 3321, and the planar surface of the hemisphere 3311 being tightly abutted to the valve outer cap 332.

When the pressure intensity of the air in the glass tube 21 is increased, the air pressure in the same air guide groove 3314 is increased, so that the edge of one plane of the hemisphere 3311 can be jacked up by overcoming the elasticity of the hemisphere 3311 itself, the air is exhausted, and the air guide hole 3321 can be sealed by one plane of the hemisphere 3311 after the air pressure is recovered, thereby preventing the outside air from entering the glass tube 21.

Example two:

referring to fig. 3 and 4, the heat dissipation module 22 includes a plurality of heat dissipation sheets 223 and a plurality of connection bands 224, the heat dissipation sheets 223 are respectively provided with through holes 2231 matching with the outer peripheral surface of the glass tube 21, the connection bands 224 are fixedly connected between adjacent heat dissipation sheets 223, the hole peripheries of the through holes 2231 are fixedly connected with flanging sheets 225, and the side surfaces of the flanging sheets 225 are abutted against the outer side surfaces of the glass tube 21.

The circular heat dissipation thin sheet 223 is punched and can be connected together through the connecting belt 224, and the flanging length of the flanging sheet 225 is 1-2 mm and is in contact with the outer surface of the glass tube 21, so that heat is easier to conduct, and the surface temperature is reduced. The connection band 224 can enhance the structural strength of the heat dissipation module 22, and can effectively protect and prevent the glass tube 21 from safety accidents caused by the heat wire easily sagging after being broken by external force.

Example three:

referring to fig. 5 and 6, a plurality of clamping grooves 2232 are formed in the side surface of each heat dissipation sheet 223, and the connecting band 224 is clamped with the clamping grooves 2232 after sequentially passing through the single clamping groove 2232 on the adjacent heat dissipation sheet 223, so that the heat dissipation sheet 223 can be conveniently detached and installed, and the maintenance operation can be rapidly performed.

Example four:

referring to fig. 7, a cylindrical groove is formed in one end, away from the glass tube 21, of the rubber cap 31, a sealing plug 4 is arranged in the groove, and the outer side wall of the sealing plug 4 is in sliding fit with the inner side wall of the groove. Further, the other end of the sealing plug 4 is fixedly connected with a sealing rod 41 in an integrated forming manner, and an air suction hole 315 for communicating the outside with the inside of the glass tube 21 is formed in the rubber cap 31. The heating wire 12 installed in the glass tube 21 is electrically connected to the lead wire 11 through the connection terminal 32, and the lead wire 11 passes through the threading hole of the rubber cap 31 to protrude outside the heater. The wire 11 and the threading hole are in interference fit to form a closed state, and when the vacuum pump connector is assembled, the vacuum pump connector is inserted into the air suction hole 315, and the sealing cover is inserted into a half to be sealed. Then, the vacuum pump is started to evacuate the air in the glass tube 21 to a predetermined pressure, and then the sealing cap is inserted to the bottom to seal the glass tube. Through the processing, the damage of the glass tube 21 or the rubber cap 31 caused by the thermal expansion of the gas in the glass tube 21 can be prevented, and the corrosion of the heating wire 12 caused by the moisture in the external air entering the glass tube 21 can also be prevented.

Example five:

referring to fig. 8, the glass tube 21 is made of a fragile material, so as to prevent the glass tube 21 from being damaged due to improper or unexpected operation during use, which may cause the extreme situation that the two ends of the glass tube 21 are simultaneously broken, which may cause the falling of the heating wire 12 and cause a fire accident. A fixing piece 5 made of metal is arranged below the electric heating tube. The heat dissipating sheet 223 is provided with a concave mounting groove 312, the fixing piece 5 is inserted into the mounting groove 312, and both ends of the fixing piece 5 in the length direction are bent upward and then inserted into the rubber cap 31 for fixing. The fixing piece 5 is fitted into the mounting groove 312 of the heat radiating sheet 223, so that the heat radiating sheet 223 can be fixed without rotating on the glass tube 21. The two ends are bent upwards, so that the heat dissipation sheet 223 can be prevented from sliding left and right along the glass tube 21, the stability and the consistency of the product structure are ensured, and the glass tube 21 is protected to a certain extent.

Referring to fig. 9, the heating wire 12 installed in the glass tube 21 is connected to the lead wire 11 through a connection terminal 32, and the lead wire 11 is extended outside the electric heating tube through a threading hole of the rubber cap 31. The wire 11 and the threading hole are in interference fit to form a closed state. One end of the exhaust hole 311 is communicated with the inside of the glass tube 21, and the other end is enlarged at the end of the rubber cap 31 and is provided with a check valve assembly 6, wherein the check valve assembly 6 comprises a valve 64, an inner cover 61, an outer cover 62 and a spring 63. One end of the spring 63 is fixedly connected with the outer cover 62, and the other end is fixedly connected with the valve 64, when the heater is electrified to work, the internal air is heated and expanded to generate pressure, meanwhile, the spring 63 is compressed, and when the pressure reaches the set value of the valve 64, the valve 64 is opened to discharge the internal air. The pressure inside the glass tube 21 is reduced to prevent the glass tube 21 from being broken or other parts from being damaged. When the internal pressure drops below the set value of the valve 64, the spring 63 naturally resumes driving the valve 64 closed. Prevent external moisture and the like from entering the glass tube 21 to corrode the heating wire 12, and prolong the service life of the heating wire 12. Meanwhile, the safety accidents such as fire caused by the leakage of the refrigerant into the glass tube 21 can be prevented.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. An electric heating pipe comprises a heating component (1) and a heat dissipation component (2), wherein the heat dissipation component (2) comprises a glass pipe (21) and a heat dissipation module (22) made of metal, the heating component (1) comprises a plurality of leads (11) and a heating wire (12) arranged in the glass pipe (21), two ends of the heating wire (12) are electrically connected with the leads (11), and two ends of the glass pipe (21) are respectively provided with an insulating protection piece (3), the electric heating pipe is characterized in that the heat dissipation module (22) is detachably fixed outside the glass pipe (21), and the leads (11) are penetrated, sealed and fixed in the insulating protection piece (3);

the heat dissipation module (22) comprises a spiral ribbon-shaped heat dissipation belt (221), the heat dissipation belt (221) is sleeved on the outer circumferential surface of the glass tube (21) along the axis direction of the glass tube (21), the heat dissipation module (22) comprises a flanging belt (222) fixed on the inner ring edge of the heat dissipation belt (221), and the spiral rotation direction of the flanging belt (222) is the same as that of the heat dissipation belt (221);

or the heat dissipation module (22) comprises a plurality of heat dissipation sheets (223) and a plurality of connecting bands (224), the heat dissipation sheets (223) are provided with through holes (2231) matched with the peripheral surface of the outer side of the glass tube (21), the connecting bands (224) are fixedly connected between the adjacent heat dissipation sheets (223), the hole peripheries of the through holes (2231) are fixedly connected with flanging sheets (225), the side surfaces of the flanging sheets (225) are abutted against the outer side surfaces of the glass tube (21), the side surfaces of the heat dissipation sheets (223) are provided with a plurality of clamping grooves (2232), and the connecting bands (224) sequentially penetrate through the single clamping grooves (2232) on the adjacent heat dissipation sheets (223) and then are clamped with the clamping grooves (2232); the insulation protection member (3) comprises a rubber cap (31), a connection terminal (32) and a check valve assembly (33);

the heating wire (12) is electrically connected with the lead (11) through the connecting terminal (32), a wire hole is formed in the rubber cap (31), one end, far away from the heating wire (12), of the lead (11) penetrates out of the rubber cap (31) through the wire hole, and the lead (11) is in interference fit with the wire hole;

the rubber cap (31) is provided with an exhaust hole (311) communicated with the glass tube (21);

the one-way valve assembly (33) is detachably fixed on the exhaust hole (311) and is used for limiting the external air from entering the glass tube (21) through the exhaust hole (311); the check valve component (33) comprises a valve body (331) made of rubber, a mounting groove (312) communicated with the exhaust hole (311) is formed in the rubber cap (31), a mounting column (313) is formed at the bottom of the mounting groove (312), one end, far away from the glass tube (21), of the mounting column (313) is fixedly connected with a reverse hook body (314), the valve body (331) is detachably connected to the mounting column (313), and the valve body (331) limits outward movement of gas in the glass tube (21),

the check valve component (33) comprises a valve outer cover (332), the valve outer cover (332) is embedded, clamped and fixed in the mounting groove (312), the valve outer cover (332) is provided with an air guide hole (3321) communicated with the exhaust hole (311), and the valve body (331) seals the air guide hole (3321) in a one-way mode;

or, a sealing plug (4) is arranged in the rubber cap (31) in a sliding mode, a sealing rod (41) is fixedly connected to one end of the sealing plug (4) in an integrated forming mode, an air exhaust hole (315) which is communicated with the outside and the glass tube (21) is formed in the rubber cap (31), and the sealing rod (41) is inserted and fixed in the air exhaust hole (315).

2. An electric heating tube according to claim 1, characterized in that: the valve body (331) comprises a hemisphere (3311), a positioning hole (3312) which is formed in one plane of the hemisphere (3311) and through which the mounting column (313) penetrates, an inverted hook limiting groove (3313) which is formed in one plane of the positioning hole (3312) and away from the hemisphere (3311), and an annular air guide groove (3314) which is formed in one plane of the hemisphere (3311), wherein the inverted hook limiting groove (3313) is matched with the inverted hook body (314); the air guide groove (3314) is communicated with the air guide hole (3321), and one surface of the plane of the hemisphere (3311) is tightly abutted to the valve outer cover (332).

3. An electric heating tube according to claim 1, characterized in that: the below of glass pipe (21) is provided with stationary blade (5), the confession has been seted up in the border department of radiating thin slice (223) stationary blade (5) inlay mounting groove (312) of establishing, stationary blade (5) are followed its length direction's both ends orientation insert after glass pipe (21) buckle and establish in rubber cap (31).

4. An electric heating tube according to claim 1, characterized in that: insulating protection piece (3) still include check valve subassembly (6), check valve subassembly (6) include valve (64), inner cup (61), enclosing cover (62) and spring (63), the one end and enclosing cover (62) fixed connection of spring (63), the other end and valve (64) fixed connection, the one end of inner cup (61) is fixed on enclosing cover (62), valve (64) are kept away from the one end of spring (63) with exhaust hole (311) butt.