CN112167728A

CN112167728A - Heating element and electron cigarette

Info

Publication number: CN112167728A
Application number: CN202010870662.XA
Authority: CN
Inventors: 孙虎
Original assignee: Shenzhen Tatfook 2r Forming Technologhy Co ltd
Current assignee: Shenzhen Tatfook 2r Forming Technologhy Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-01-05

Abstract

The application discloses heating element and electron cigarette, this heating element include heating pipe and heat insulating pipe, and the heat insulating pipe box is established outside the heating pipe, and the material of heat insulating pipe is engineering plastics. By additionally arranging the heat insulation pipe outside the heating pipe, the situation that the shell of the electronic cigarette is overheated and even burnt due to long-time heating of the heating pipe can be prevented; meanwhile, engineering plastics with high temperature resistance, flame retardance and stable insulating property are used as materials of the heat insulation pipe, so that the heat insulation function of the heat insulation pipe is enhanced, and the use performance of the heating assembly is improved.

Description

Heating element and electron cigarette

Technical Field

The application relates to the technical field of electronic cigarettes, in particular to a heating assembly and an electronic cigarette.

Background

The electronic cigarette is a smoking product for smokers and consists of a cigarette holder and an atomizer, wherein the cigarette liquid arranged in the atomizer is heated and atomized by the atomizer to generate smoke, and the smokers smoke the cigarette holder. The traditional cigarette contains tar components, the harm of the tar to the human body is large, and the electronic cigarette liquid does not contain the tar components in the tobacco, so that the electronic cigarette gradually replaces the traditional cigarette to be widely used along with the continuous improvement of the health consciousness of people.

Among the prior art, the heating device of electron cigarette does not set up corresponding heat-proof device for electron cigarette appears because long-time heating leads to electron cigarette shell to send out the boiling hot at the in-process of heating, and the burning condition takes place even, influences the life of electron cigarette, and user's use is experienced.

Disclosure of Invention

In order to solve the technical problem, the application adopts a technical scheme that: the heating assembly comprises a heating pipe and a heat insulation pipe, wherein the heat insulation pipe is sleeved outside the heating pipe, and the heat insulation pipe is made of engineering plastics.

Alternatively, the engineering plastic includes polyetherketone, polyphenylene sulfide, polyimide, and polysulfone.

Optionally, the diameter of the insulating tube ranges from 8.87 mm to 8.97mm, the length of the insulating tube ranges from 29.0 mm to 33.3mm, and the wall thickness of the insulating tube ranges from 0.25 mm to 0.35 mm.

Optionally, the heating assembly further comprises a first support frame and a second support frame, and two ends of the heating pipe and the heat insulation pipe are respectively fixed on the first support frame and the second support frame.

Optionally, the first support frame is provided with a first support portion and a second support portion, the first support portion and the second support portion are distributed in a ladder shape, the heating pipe is arranged on the second support portion, the first support portion is arranged around the heating pipe, and the heat insulation pipe is arranged on the first support portion.

Optionally, the second support frame is provided with a first opening end, and the diameter of the first opening end is larger than that of the heating pipe and smaller than that of the heat insulation pipe; the first opening end is sleeved on one end of the heating pipe, and the heat insulation pipe is sleeved on the first opening end.

Optionally, the heating assembly further comprises a thermocouple group welded to the heating tube;

the thermocouple group comprises a first thermocouple, a second thermocouple and a third thermocouple, wherein the length of the first thermocouple is equal to that of the third thermocouple and is smaller than that of the second thermocouple.

Optionally, the heating tube includes a first heating region and a second heating region, the second thermocouple is disposed in the first heating region, and the first thermocouple and the third thermocouple are disposed in the second heating region.

Optionally, the heating curve of the first heating zone is a first heating curve, and the heating curve of the second heating zone is a second heating curve; the heating pipe is preset with first heating time, second heating time and third heating time, and the third heating time is longer than the first heating time and shorter than the second heating time;

the heating time of the heating pipe is less than the first heating time, the temperature of the first heating curve increases along with the increase of the heating time, and the slope of the first heating curve decreases along with the increase of the heating time; the heating time of the heating pipe is longer than the first heating time and shorter than the second heating time, the temperature of the first heating curve is reduced along with the increase of the heating time, and the slope of the first heating curve is increased along with the increase of the heating time;

the heating time of the heating pipe is shorter than the second heating time, the temperature of the second heating curve is increased along with the increase of the heating time, and the temperature of the second heating curve is increased in a stepped manner;

the heating time of the heating pipe is shorter than the third heating time, and the temperature of the first heating area is higher than that of the second heating area; the heating time of the heating pipe is equal to the third heating time, and the temperature of the first heating area is equal to the temperature of the second heating area; the heating time of the heating pipe is longer than the third heating time, and the temperature of the first heating area is lower than that of the second heating area.

In order to solve the above technical problem, the present application adopts another technical solution: an electronic cigarette is provided, which comprises the heating component.

The beneficial effect of this application is: different from the prior art, the electronic cigarette has the advantages that the heat insulation pipe is additionally arranged outside the heating pipe, so that the situation that the shell of the electronic cigarette is overheated and even burns due to long-time heating of the heating pipe can be prevented; meanwhile, engineering plastics with high temperature resistance, flame retardance and stable insulating property are used as materials of the heat insulation pipe, so that the heat insulation function of the heat insulation pipe is enhanced, and the use performance of the heating assembly is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a first construction of an embodiment of a heating assembly of the present application;

FIG. 2 is a schematic structural view of an embodiment of a heating tube of the present application;

FIG. 3 is a second schematic view of an embodiment of the heating assembly of the present application;

FIG. 4 is a schematic view of a third construction of an embodiment of a heating assembly of the present application;

FIG. 5 is a fourth schematic view of an embodiment of a heating assembly of the present application;

FIG. 6 is a schematic view of a heating profile of a heating assembly of the present application;

figure 7 is a schematic structural view of an embodiment of an electronic cigarette of the present application;

FIG. 8 is a schematic flow chart of an embodiment of a first heating pipe surface treatment method according to the present application;

FIG. 9 is a schematic flow diagram of a first embodiment of a first heating pipe surface treatment method according to the present application;

FIG. 10 is a flowchart illustrating an embodiment of step S21 of FIG. 9;

FIG. 11 is a schematic flow chart of a first embodiment of a method for surface treatment of a heating tube according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to make those skilled in the art better understand the technical solution of the present application, the heating assembly and the electronic cigarette provided by the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.

Referring to fig. 1-5, fig. 1 is a schematic view of a first structure of an embodiment of a heating element of the present application; FIG. 2 is a schematic structural view of an embodiment of a heating tube of the present application; FIG. 3 is a second schematic view of an embodiment of the heating assembly of the present application; FIG. 4 is a schematic view of a third construction of an embodiment of a heating assembly of the present application; FIG. 5 is a fourth schematic diagram of an embodiment of a heating assembly of the present application.

As shown in fig. 1 and 2, the heating module 1 of the present application includes a heating pipe 10, an insulating pipe 40, a first support frame 21, and a second support frame 22. The heat insulation pipe 40 is sleeved outside the heating pipe 10, and two ends of the heating pipe 10 and the heat insulation pipe 40 are respectively fixed on the first support frame 21 and the second support frame 22.

In the embodiment, the heat insulation pipe 40 is additionally arranged outside the heating pipe 10, so that the situation that the shell of the electronic cigarette is overheated and even burnt due to long-time heating of the heating pipe 10 can be prevented; meanwhile, the first support frame 21 and the second support frame 22 are used for fixedly supporting the heating pipe 10 and the heat insulation pipe 40, so that the positions of the heating pipe 10 and the heat insulation pipe 40 are relatively fixed, the heat insulation function of the heat insulation pipe 40 is further enhanced, and the service performance of the heating assembly 1 is improved.

Further, the material of the heat insulation pipe 40 is engineering plastic, and the engineering plastic specifically includes polyether ketone, polyphenylene sulfide, polyimide, and polysulfone.

Among them, polyether ketone (PEEK), Poly-ether-ether-ketone, has the characteristics of high temperature resistance, flame retardance, excellent mechanical properties and stable insulation. Polyphenylene Sulfide (PPS), which is characterized by high heat resistance, mechanical strength, rigidity, excellent flame retardancy, and self-extinguishing property. Polyimide (PI, Polyimide), one of the best variety of heat resistance, high temperature resistance and extremely low temperature resistance, and has the characteristics of good mechanical property, fatigue resistance, flame retardancy and the like. Polysulfone (PSF, polysaltone) has the characteristics of high thermal stability, hydrolysis resistance, flame resistance, self-extinguishing property and the like, and simultaneously keeps excellent mechanical properties at high temperature.

In the embodiment, by using the engineering plastic with high heat resistance, flame retardancy and self-extinguishing property, the heat insulation function of the heat insulation pipe 40 can be enhanced, the situation that the heating pipe 10 is heated for a long time to cause overheating and even burning of the electronic cigarette housing can be prevented, and the service performance of the heating component 1 can be improved.

Wherein the diameter range of the heat insulation pipe 40 is 8.87-8.97mm, the length range of the heat insulation pipe 40 is 29.0-33.3mm, and the pipe wall thickness range of the heat insulation pipe 40 is 0.25-0.35 mm. Optionally, the length of the insulating tube 40 ranges from 29.0 to 29.3 mm. Optionally, the length of the insulating tube 40 ranges from 33.0 to 33.3 mm.

The heating pipe 10 includes a first heating pipe 11 and a second heating pipe 12, the second heating pipe 12 is sleeved and fixed on one end of the first heating pipe 11, a first supporting frame 21 is sleeved and fixed on the other end of the first heating pipe 11, and a second supporting frame 22 is sleeved and fixed on the second heating pipe 12.

The heat insulation pipe 40 is sleeved outside the first heating pipe 11 and the second heating pipe 12, the heat insulation pipe 40 and the first heating pipe 11 as well as the heat insulation pipe 40 and the second heating pipe 12 are fixed through the first support frame 21 and the second support frame 22 respectively, and the heat insulation pipe 40 and the first support frame 21 and the second support frame 22 are fixed in a welding mode.

As shown in fig. 5, the first support frame 21 includes a first support portion 211 and a second support portion 212. The first supporting portion 211 and the second supporting portion 212 are distributed in a step shape, the mounting portion 112 of the first heating tube 11 is disposed on the second supporting portion 212, the first supporting portion 211 is disposed around the main body 111 of the first heating tube 11, and the heat insulation tube 40 is sleeved on the first supporting portion 211 to fix the heat insulation tube 40 and the first heating tube 11.

The second support frame 22 is provided with a first open end 221. The diameter of the first open end 221 is larger than the diameter of the second heating pipe 12 and smaller than the diameter of the heat insulating pipe 40; the first opening end 221 is sleeved on the second heating pipe 12, and the heat insulation pipe 40 is sleeved on the first opening end 221, so as to fix the heat insulation pipe 40 and the second heating pipe 12.

As shown in fig. 2, the first heating pipe 11 includes a main body 111 and a mounting portion 112 disposed at one end of the main body 111, and the mounting portion 112 is disposed on the first support frame 21. An included angle α is formed between the side wall of the mounting portion 112 and the main body 111, and the included angle α is an obtuse angle. Alternatively, the included angle α may be 120 ° or 150 °, and the like, and the angle may be set according to the product requirement.

Wherein, the diameter range of the main body 111 of the first heating pipe 11 is 5.65-7.20mm, the diameter range of the end of the mounting part 112 far away from the main body 111 is 6.4-8.2mm, the length range of the first heating pipe 11 is 35.78-44.60mm, the length range of the mounting part 112 is 0.25-0.75mm, and the pipe wall thickness range of the first heating pipe 11 is 0.05-0.10 mm.

Alternatively, the diameter of the main body 111 may range from 5.65 to 5.73mm, the diameter of the mounting portion 112 at the end away from the main body 111 may range from 6.4 to 6.6mm, the length of the first heating pipe 11 may range from 44.4 to 44.6mm, the length of the mounting portion 112 may range from 0.25 to 0.75mm, and the wall thickness of the first heating pipe 11 may range from 0.06 to 0.10 mm.

Alternatively, the diameter of the main body 111 may range from 7.0 to 7.2mm, the diameter of the mounting portion 112 at the end away from the main body 111 may range from 8.0 to 8.2mm, the length of the first heating pipe 11 may range from 35.78 to 36.18mm, the length of the mounting portion 112 may range from 0.42 to 0.62mm, and the wall thickness of the first heating pipe 11 may range from 0.05 to 0.09 mm.

The second heating pipe 12 includes a third heating area 121 and a fourth heating area 122, the diameter of the third heating area 121 is larger than that of the fourth heating area 122, and the third heating area 121 is partially sleeved on the main body 111. Specifically, the third heating region 121 is connected to the main body 111 by welding.

Wherein, the ratio of the length d2 of the third heating zone 121 sleeved on the first heating pipe 11 to the length d1 of the first heating pipe 11 is 0.045-0.056. Alternatively, d2 may be 2 mm.

As shown in fig. 3, the heating assembly 1 further includes a thermocouple group 30, a first sealing ring 51, and a second sealing ring 52.

The thermocouple group 30 is welded to the main body 111. The thermocouple group 30 further includes a first thermocouple 31, a second thermocouple 32, and a third thermocouple 33, and the length of the first thermocouple 31 is equal to the length of the third thermocouple 33 and is smaller than the length of the second thermocouple 32.

The first heating tube 11 further includes a first heating zone 113 and a second heating zone 114, the first thermocouple 31 and the third thermocouple 33 are disposed in the first heating zone 113, the second thermocouple 32 is disposed in the second heating zone 114, the first heating zone 113 is disposed near the second heating tube 12, the second heating zone 114 is disposed near the mounting portion 112, that is, the first thermocouple 31 and the third thermocouple 33 are disposed near the second heating tube 12, and the second thermocouple 32 is disposed near the mounting portion 112.

Alternatively, the first thermocouple 31 and the third thermocouple 33 may be constantan thermocouples, and the second thermocouple 32 may be an iron thermocouple.

With further reference to fig. 6 in conjunction with fig. 1-3, fig. 6 is a schematic heating curve diagram of a heating element of the present application. As shown in fig. 6, S1 is a first heating curve, S2 is a second heating curve, the heating curve of the first heating region 113 is a first heating curve S1, and the heating curve of the second heating region 114 is a second heating curve S2. The heating assembly 1 is preset with a first heating time t1, a second heating time t2 and a third heating time t3, the third heating time t3 being greater than the first heating time t1 and less than the second heating time t 2.

(1) When the heating time T of the first heating pipe 11 is less than the first heating time T1, the temperature T of the first heating curve S1₁Increases with increasing heating time t, and the slope of the first heating curve S1 decreases with increasing heating time t; i.e. temperature T₁The heating time t is increased continuously, and the increasing speed is gradually reduced.

When the heating time T of the first heating pipe 11 is greater than the first heating time T1 and less than the second heating time T2, the temperature T of the first heating curve S1₁Decreases with increasing heating time t, and the slope of the first heating curve S1 increases with increasing heating time t; i.e. temperature T₁The decrease continues with the increase of the heating time t, and the decreasing speed gradually slows down.

The first heating profile S1 is that the temperature T reaches the first heating time T1 when the heating time T reaches the first heating time T1₁A maximum value T1 is reached.

(2) When the heating time T of the first heating pipe 11 is less than the second heating time T2, the temperature T of the second heating curve S2₂Increases with the increase of the heating time T, and the temperature T of the second heating curve S2₂The step-shaped growth is realized.

The first heating pipe 11 is previously set with the fourth heating time t4 and the fifth heating time t 5. When the heating time T reaches the fourth heating time T4, the temperature T₂A first jump occurs; when the heating time T reaches the fifth heating time T5, the temperature T₂A second transition occurs, and the magnitude of the second transition is greater than the magnitude of the first transition.

(3) When the heating time T of the first heating pipe 11 is less than the third heating time T3, the temperature T of the first heating curve S1₁Temperature T greater than second heating curve S2₂；

When the heating time T of the first heating pipe 11 is equal to the third heating time T3, the temperature T of the first heating profile S1₁Temperature T equal to second heating curve S2₂At this time T₁＝T₂＝T2；

When the heating time T of the first heating pipe 11 is less than the third heating time T3, the temperature T of the first heating curve S1₁Temperature T greater than second heating curve S2₂。

(4) When the heating time t of the first heating pipe 11 is longer than the second heating time t2, the first heating zone 113 and the second heating zone 114 both maintain the temperature decreasing state.

This implementation is through controlling first heating zone 113 and second heating zone 114 and heating according to first heating curve S1 and second heating curve S2 respectively, and then realizes the subregion control to first heating zone 113 and second heating zone 114 to make the same region of electron cigarette need not long-time heating, prevent the overheated condition of electron cigarette shell that leads to of heating time overlength and heating power oversize.

The first sealing ring 51 is sleeved on the fourth heating zone 122 of the second heating pipe 12, so that the fourth heating zone 122 is completely wrapped by the first sealing ring 51 for enhancing the air tightness of the heating assembly 1.

The second sealing ring 52 is sleeved on the side of the main body 111 of the first heating pipe 11 close to the mounting portion 112 for enhancing the air tightness of the heating assembly 1.

As shown in fig. 4 and 5, the heating assembly 1 further comprises a third sealing ring 53, a fourth sealing ring 54 and a sealing glue 60.

The fourth sealing ring 54 is sleeved on a section of the first supporting frame 21 away from the mounting portion 112 for enhancing the air tightness of the heating assembly 1.

The second support 22 is further provided with a second open end 222 and an opening 223. The second opening end 222 is sleeved with a third sealing ring 53 for enhancing the air tightness of the heating assembly 1. The opening 223 is used for accommodating the thermocouple group 30, and the sealing glue 60 is disposed on the opening 223 to further fix the thermocouple group 30 and the heat insulation pipe 40.

Alternatively, the second support frame 22 is disposed in an L-shape to change the flow direction of the soot vaporized by the heating assembly 1, thereby preventing the soot from reacting with the thermocouple group 30.

The present application further optimizes the first heating duct 11 on the basis of the overall structure of the heating assembly 1 described above in two respects:

1. the material of the first heating pipe 11 is replaced.

The inventor researches and finds that the SPCE can be used as the material of the heating pipe, the carbon content of the SPCE is higher than that of other stainless steel materials, and the surface of the product is easy to rust in the using process. In order to solve the technical problem that the heating tube is prone to rust, the first heating tube 11 of the present application uses a heating alloy instead of SPCE material, and specifically may be at least one of Ni6 type alloy, 2035 type alloy, 2080 type alloy, SUS304, and SUS 316. Wherein the carbon content of the heating alloy is less than or equal to 0.08%, which can improve the corrosion resistance of the first heating pipe 11. Alternatively, the carbon content of the heating alloy is further 0.01% or less.

Specifically, the nickel content of the Ni6 type alloy is less than or equal to 99.6%, i.e., the nickel content of the Ni6 type alloy is up to 99.6%; the iron content of the Ni6 type alloy is less than or equal to 0.1%; the carbon content of the Ni6 type alloy is less than or equal to 0.2%.

The nickel content of the 2035 type alloy is 34-37%, the chromium content of the 2035 type alloy is 18-21%, the iron content of the 2035 type alloy is 42-48%, and the carbon content of the 2035 type alloy is less than or equal to 0.1%.

The nickel content of the 2080 type alloy is 76-80%, the chromium content of the 2080 type alloy is 20-23%, the iron content of the 2080 type alloy is less than or equal to 1%, and the carbon content of the 2080 type alloy is less than or equal to 0.1%.

The SUS304 has a nickel content of 8% to 11%, the SUS304 has a chromium content of 18% to 20%, and the SUS304 has a carbon content of 0.08% or less.

The nickel content of SUS316 is 10% to 14%, the chromium content of SUS316 is 16% to 18%, and the carbon content of SUS316 is 0.08% or less.

The SPCE material belongs to a cold-rolled carbon steel plate and a steel strip for deep drawing, and comprises the following chemical components: 0.01% of C, 0.01% of Si, 0.1% of Mn, 0.009% of P, 0.009% of S, and 99.862% of Fe.

The SPCE material is replaced by the heating alloy which is low in carbon content, low in iron content, high in nickel content and high in chromium content, the characteristics of corrosion resistance and high-temperature oxidation resistance of the chromium element are utilized, the characteristics of strong corrosion resistance of the nickel element are utilized, and the corrosion resistance of the first heating pipe 11 is further improved.

2. A surface treatment process of the first heating pipe 11.

Referring to fig. 8, fig. 8 is a schematic flow chart of a first heating pipe surface treatment method according to an embodiment of the present application. The method provided by the embodiment specifically comprises the following steps:

s11: alkaline copper plating is carried out on the first heating pipe 11, so that an alkaline copper plating layer is formed on the surface of the first heating pipe 11;

generally, the surface of the first heating pipe 11 is coated with a film so that the surface of the first heating pipe 11 forms a thin film to protect the first heating pipe 11. For example, during the plating process of the first heating tube 11, alkaline copper plating is performed on the first heating tube 11, so that an alkaline copper plating layer is formed on the surface of the first heating tube 11, and the alkaline copper plating layer can isolate the first heating tube 11 from the air, thereby preventing the first heating tube 11 from being corroded due to the influence of the environment.

Generally, the first heating tube 11 is easily stained with grease, and ester hydrolysis reaction occurs when water is encountered. The hydrolysis of the ester, i.e. whether the saponification reaction is complete, depends on the driving force of the reaction and whether the equilibrium can be shifted forward to complete the reaction.

For simple esters, under basic conditions, such as hydrolysis of the methyl ester to carboxylic acid and methanol, the carboxylic acid can further undergo an acid-base reaction to form a carboxylate salt, thereby driving the equilibrium forward. For another example, in the production of soap, the produced higher fatty acid sodium is precipitated, so that the reaction moves forward. Generally, for simple esters, i.e., the common methyl, ethyl, etc., alkaline hydrolysis is commonly used.

Copper is easy to corrode in a slightly alkaline environment to generate a corrosion product mainly containing basic copper carbonate, and specifically, if a process method of alkaline copper plating on the first heating pipe 11 to form a copper layer on the surface of the first heating pipe 11 is adopted, an activating agent can be added into an alkaline copper solution; the activating agent is a kind of regulator which can enhance the adsorption capacity of the mineral surface to the collecting agent in the flotation reagent. The method is used for eliminating the action of an inhibitor by changing the chemical composition of the surface of the mineral, so that the mineral is easy to adsorb the collecting agent. Such as ethylene diamine phosphate, propylene diamine phosphate, xylene, sodium fluorosilicate, ammonium sulfate, ammonium chloride, ferrous sulfate, ammonium hydroxide, etc.

Among them, alkaline copper solutions can be selected specifically: the components in 1 liter of the solution are 33.7g of copper ion content, 47.4g of cuprous cyanide and 15.5g of sodium cyanide.

For different plating time, for example, 1min, 2min, 3min, 5min, 8min, 10min, and 15min are selected to perform alkaline copper plating on the first heating pipe 11, and the thickness of the alkaline copper plating layer is different.

For example, the first heating pipe 11 is immersed in the alkaline copper solution for 1 to 8 minutes, such as 1 minute, 3 minutes, 5 minutes or 8 minutes, and the metal ions on the surface of the first heating pipe 11, which are more active than copper, are used to replace the copper ions in the alkaline copper solution, such as the iron ions replace the copper ions, so that the alkaline copper plating layer is formed on the first heating pipe 11.

S12: performing acid copper plating on the first heating pipe 11 after alkaline copper plating, and further forming an acid copper plating layer on the surface of the first heating pipe 11 after alkaline copper plating;

the alkaline copper plating process is better in the effect of forming an alkaline copper plating layer, but after all, alkaline copper plating is a certain degree of active ion replacement on the surface of the first heating pipe 11, because generally speaking, once the alkaline copper plating solution exceeds a certain alkaline degree value, copper ions and hydroxide ions can combine to form copper hydroxide, so that precipitates are precipitated in the solution, and the expected effect and the required requirements cannot be met.

Therefore, the first heating tube 11 after alkaline copper plating is also subjected to acid copper plating, and a second copper layer is further formed on the surface of the first heating tube 11 after alkaline copper plating to replace the remaining metal ions more active than copper ions on the surface of the first heating tube 11.

Specifically, in order to enhance the compactness and the aesthetic appearance of the copper layer on the surface of the first heating tube 11, for example, sulfuric acid and a brightener may be added to the acidic copper solution; the first heating pipe 11 is immersed in the acidic copper plating solution for at least 1-10 minutes, such as 1 minute, 3 minutes, 5 minutes, 8 minutes, or 10 minutes, etc., wherein 157.3g of copper sulfate and 57.9g of sulfuric acid are included in 1 liter of the acidic copper plating solution. Further, the metal ions on the surface of the first heating tube 11, which are more active than copper, replace the copper ions in the acidic copper solution, for example, the iron ions replace the copper ions, so that the copper ions in the acidic copper solution are precipitated on the surface of the first heating tube 11, so that an acidic copper plating layer is formed, and the thickness of the copper layer is thicker.

The plating solution for acid copper plating has high current efficiency and high deposition speed. The brightening agent has obvious brightening effect and good leveling performance, and can obtain mirror-surface glossy coating. During the acid copper plating operation, cathode movement or compressed air stirring is required, and the temperature of the plating solution is preferably controlled within 30 ℃.

The active carbon adsorption treatment can be carried out regularly according to the needs during the work, thereby avoiding the accumulation of a large amount of organic decomposition products and influencing the product quality.

Wherein the time period for performing the acidic copper plating on the surface of the first heating pipe 11 is greater than or equal to the time period for performing the alkaline copper plating on the surface of the first heating pipe 11.

S13: the first heating pipe 11 after the acid copper plating is plated with nickel, and a nickel layer is formed on a copper layer composed of the alkaline copper plating layer and the acid copper plating layer.

Generally, the oxidation reaction of copper is also present, but the oxidation reaction of copper is slower than that of general metal materials, such as iron, however, the oxidation reaction of copper is accelerated in the high temperature environment of the acid-base salt mixed with the oil smoke, so that the copper plating on the surface of the first heating tube 11 can only delay the oxidation time of the first heating tube 11, but the time for the copper plating is limited.

In order to prevent the problem of the bonding force of the copper layer, acid copper plating cannot be directly electroplated on the substrate of the first heating pipe 11, and acid copper plating can be carried out after copper cyanide or dark nickel priming; otherwise, the coating adhesion may be problematic.

In order to further protect the copper layer of the plating film, further nickel plating may be performed on the copper layer of the plating film on the surface of the first heating tube 11 by forming a nickel layer on the alkaline copper plating layer and the acidic copper plating layer to prevent the first heating tube 11 from rusting.

Therefore, in the embodiment of the application, before nickel plating, alkaline copper plating and acidic copper plating are sequentially added, and the time period for performing the acidic copper plating on the surface of the first heating pipe 11 is greater than or equal to the time period for performing the alkaline copper plating on the surface of the first heating pipe 11, so that the thickness of the copper layer on the surface of the first heating pipe 11 is increased, the compactness of the copper layer is increased, the quality of the copper layer on the surface of the first heating pipe 11 can be improved, and then the copper layer is protected by the nickel plating, so that the surface of the copper layer is prevented from being corroded too fast in the later use process of the first heating pipe 11, the service life of the first heating pipe 11 is prolonged, and the purpose of.

FIG. 9 is a schematic flow chart of a first embodiment of a first heating pipe surface treatment method according to the present application. Optionally, before the step of performing alkaline copper plating on the first heating tube 11 to form a copper layer on the surface of the first heating tube 11, the method specifically includes the following steps:

s21: cleaning the first heating pipe 11;

generally, the first heating tube 11 is easily contaminated by oil stains, and if the first heating tube 11 contaminated by oil stains is directly plated with copper, the adhesion of the plated copper layer is easily reduced, so that before the first heating tube 11 is subjected to alkaline copper plating, it is very necessary to clean the first heating tube 11, and sometimes the whole plated copper layer process is affected.

Generally speaking, the grease is easy to be saponified in the alkaline solution, so as to affect the concentration of the alkaline copper solution, and therefore, by cleaning the first heating pipe 11, not only can the pollution of the grease to the first heating pipe 11 be isolated, but also the pollution of the grease to the alkaline copper solution can be prevented, so that the adsorption force of the surface of the first heating pipe 11 on the precipitated copper is enhanced, and the alkaline copper plating layer is made to be more compact.

S22: pre-plating nickel on the surface of the first heating pipe 11;

nickel plating typically includes several types: the types of the nickel plating solution mainly include sulfate type, chloride type, sulfamate type, citrate type, fluoroborate type, and the like. Among them, the sulfate type (low chloride) is called Watts nickel plating solution, which is most commonly used in industry.

Therefore, the surface of the first heating pipe 11 is not smooth and flat, and in order to protect the smooth surface of the first heating pipe 11 itself, the surface of the first heating pipe 11 may be nickel pre-plated to flatten the surface of the first heating pipe 11, so that the precipitated copper can be more tightly attached to the surface of the first heating pipe 11 when the alkaline copper plating solution is used again later.

S23: and cleaning the first heating pipe 11 after nickel pre-plating.

Generally, the electroplating nickel plating solution may contain some components that can react with copper, such as nickel sulfate, which is used to provide nickel ions; nickel chloride or sodium chloride, which provides chloride ions to normally dissolve the anode, boric acid, which serves to stabilize pH, a brightener, which serves to brighten the coating, a wetting agent to reduce coating pinholes, and the like.

These components may affect the subsequent copper plating process, and therefore, the first heating pipe 11 after nickel pre-plating needs to be cleaned.

Fig. 10 is a schematic structural diagram of an embodiment of step S21 in fig. 9. The cleaning of the first heating pipe 11 specifically comprises the following steps:

s31: ultrasonic degreasing is carried out on the first heating pipe 11 for at least 6 minutes;

ultrasonic oil removal refers to the process of strengthening oil removal by arranging an ultrasonic generator seismic source in oil removal tank liquid and utilizing the cavitation effect generated by ultrasonic waves. When ultrasonic waves are applied to a liquid, instantaneous negative pressure and instantaneous positive pressure are alternately generated repeatedly. During the half period in which the negative pressure is generated, vacuum cavities are created in the liquid. Liquid vapor or gas dissolved in the solution enters the cavity, forming bubbles.

Then, during a half cycle of positive pressure, the bubble is compressed and burst, creating a strong pressure (up to thousands of atmospheres) instantaneously. On the other hand, the ultrasonic waves can generate obvious reflection action at the heterogeneous interface with different densities, and the solution on the interface is violently stirred due to the reflection sound pressure to form strong impact force for washing oil stains on the surface of a workpiece. Thereby realizing the intensified oil removing process.

Therefore, ultrasonic degreasing is performed on the first heating pipe 11 for at least 6 minutes, such as 7 minutes, such as 10 minutes, which can be selected according to actual situations, and is not limited herein, so as to achieve the purpose of sufficient degreasing.

S32: carrying out anodic electrolysis on the deoiled first heating pipe 11 for at least 2 minutes;

electrochemical oil removal, also called electrolytic oil removal, is a process of removing oil stains on the surface of a part under the action of direct current by taking the part as an anode or a cathode and adopting a stainless steel plate, a nickel-plated steel plate or a titanium plate as a second electrode in an alkaline solution. The electrochemical degreasing liquid is similar to alkaline chemical degreasing liquid, but the electrochemical degreasing liquid is mainly used for strengthening the degreasing effect by means of electrolysis, and the electrolytic degreasing is higher in efficiency and more thorough in degreasing compared with the chemical degreasing.

The anode electrolysis degreasing is characterized in that oxygen is separated out on a workpiece, and when degreasing, the bubbles of the separated out oxygen are small and large, and compared with cathode electrolysis degreasing, the emulsification capacity is poorer, so that the degreasing efficiency is relatively lower; on the other hand, the pH value of the solution on the surface of the anode is reduced due to the discharge of hydroxide ions, which is not beneficial to oil removal. Meanwhile, oxygen separated out during anode degreasing promotes the oxidation of the metal surface, even some grease is oxidized, and the removal is difficult. In addition, some metals may also cause anodic dissolution, so that non-ferrous metals and their alloys or polished parts are not suitable for anodic electrolytic degreasing. But the electrochemical oil removal of the anode can not generate 'hydrogen embrittlement', and the plated piece can not be precipitated with sponge substances.

Therefore, the anode electrolysis of the deoiled first heating pipe 11 is performed for at least 2 minutes, such as 3 minutes, such as 5 minutes, which may be selected according to practical situations, and is not limited herein, in order to sufficiently maintain the cleanliness and the adsorption force of the surface of the first heating pipe 11.

S33: the first heating tube 11 after the anodic electrolysis was subjected to cathodic electrolysis for at least 2 minutes.

The cathodic electrolysis degreasing has the characteristics of high hydrogen evolution amount, good dispersibility, small bubble size, strong emulsification effect, good degreasing effect, high degreasing speed and no corrosion to parts when hydrogen is separated out from a workpiece and cathodic electrolysis degreasing is carried out. However, the hydrogen gas generated by the precipitation permeates the inside of the metal to cause a hydrogen embrittlement effect, and therefore, the method is not suitable for degreasing highly brittle metal parts such as high-strength steel and spring steel. In addition, when the electrolytic solution contains a small amount of metal particles such as zinc, tin, lead and the like, a layer of spongy metal is precipitated on the surface of the part, so that the metal part is polluted and the binding force of the coating is influenced. Therefore, it is not suitable to apply a single cathodic electrolysis to the workpiece.

Therefore, when the combined degreasing is carried out, the degreasing is combined by adopting a mode of anode electrolytic degreasing and cathode electrolytic degreasing. For example, the first heating tube 11 after the anode electrolysis is subjected to cathode electrolysis for at least 2 minutes, so that the advantage of high cathode degreasing efficiency is utilized, and the phenomenon of hydrogen embrittlement is eliminated. Since hydrogen gas penetrating into the metal during the cathodic degreasing can be removed almost completely during a brief anodic degreasing. Meanwhile, the surface of the part is not oxidized or corroded.

FIG. 11 is a schematic structural view of a first embodiment of the present invention after a first heating tube surface treatment method. Optionally, after the acidic copper-plated first heating tube 11 is plated with nickel, the method specifically includes the following steps:

s41: activating an activating agent on the surface of the first heating pipe 11;

the activator has the function of generating a film promoting the function of the collector on the surface of the mineral, and in order to make the nickel layer adhere to the surface of the first heating pipe 11 better, the activator on the surface of the first heating pipe 11 can be activated after the first heating pipe 11 plated with the acidic copper is plated with the nickel, so that the nickel layer adheres to the surface of the first heating pipe 11 tightly.

S42: performing chemical nickel plating on the surface of the activated first heating pipe 11 for at least 15 minutes;

electroless plating is also called Electroless plating (electroplating), and may also be called Autocatalytic plating (Autocatalytic plating). The specific process is as follows: under certain conditions, metal ions in the aqueous solution are reduced by the reducing agent and precipitate onto the surface of the solid substrate. ASTM B374(ASTM, American society for testing and materials), is defined as automatic deposition is "deposition of a metallic coating by a controlled chemical reduction which is deposited by the metallic or metallic deposited. That is, autocatalytic plating is "depositing a metal coating by controlled chemical reduction catalyzed by the deposited metal or alloy. Unlike displacement plating, the plating layer can be thickened continuously, and the plated metal has catalytic capability.

In this regard, the activated first heating tube 11 may be subjected to electroless nickel plating for at least 15 minutes, such as 20 minutes, which may be selected according to the actual situation, and the nickel layer on the surface of the first heating tube 11 may be made more compact without being limited herein.

S43: washing the first heating pipe 11 after the chemical nickel plating;

s44: placing the first heating pipe 11 into the immersion protection solution;

the freshly plated nickel layer, although compact, is not strong because the nickel layer is not completely adsorbed to the surface of the first heating tube 11, and therefore, the first heating tube 11 needs to be placed in an immersion protection solution, and in particular, the immersion protection solution includes at least one of a lerek protective fluid (Lerock protective fluids) and an Iron-containing protective fluid (Iron protective fluids) to reinforce and cure the nickel layer.

In addition, an antirust agent can be added and put into the immersion protection solution; currently, rust inhibitors are conventionally classified into water-soluble rust inhibitors, oil-soluble rust inhibitors, emulsion-type rust inhibitors, gas-phase rust inhibitors, and the like.

In addition, the surface can also be treated and protected by using rust preventive oil, wherein the rust preventive oil at least comprises the following components: one of displacement type antirust oil, solvent diluting antirust oil, sealing antirust oil and emulsified type antirust oil.

Specifically, in the salt spray test of the nandina iron pipe, it can be known that:

aiming at the Lerock protective liquid, the rusty area of the port of the first heating pipe 11 with the thickness of 2um plating layer is less than 5% when the first heating pipe is rusted for 2 hours, the rusty area of the port is less than 5% when the first heating pipe is rusted for 4 hours, the rusty area of the port is rusted and extends to the middle part to be less than 10% when the first heating pipe is rusted for 6 hours, and the rusty area of the port is rusted and extends to the middle part to; the rusty area of the first heating pipe 11 with the thickness of 5.5um coating is less than 1% when the first heating pipe is rusted at the smaller end port in 2 hours, less than 1% when the first heating pipe is rusted at the larger end port in 4 hours, less than 1% when the first heating pipe is rusted at the port in 6 hours, and less than 10% when the first heating pipe is rusted at the port in 8 hours; the first heating pipe 11 with the thickness of the 7um coating does not rust in 2 hours, the rust area of the port is less than 5% when the port is rusted in 4 hours, the rust area of the port is less than 10% when the port is rusted in 6 hours, and the rust area of the port is less than 20% when the port is rusted in 8 hours.

For the iron-containing protective liquid, the port of the first heating pipe 11 with the thickness of the 2um plating layer rusts and the rusty area is less than 5% in 2 hours, the port rusts and the rusty area extending to the middle part is less than 10% in 4 hours, the port rusts and the rusty area extending to the middle part is less than 15% in 6 hours, and the port rusts and the rusty area extending to the middle part is less than 30% in 8 hours; the rusty area of the port of the first heating pipe 11 with the thickness of the 5.5um coating is less than 5% when the time is 2 hours, the rusty area of the port is less than 10% when the time is 4 hours, the rusty area of the port is less than 15% when the time is 6 hours, and the rusty area of the port is less than 30% when the time is 8 hours; the first heating pipe 11 of 7um cladding material thickness port rusts its area of rustting when 2 hours is less than 5%, and the port rusts and extends its area of rustting to the mid portion and be less than 10% when 4 hours, and the port rusts and extends its area of rustting to the mid portion and be less than 15% when 6 hours, and the port rusts and extends its area of rustting to the mid portion and be less than 30% when 8 hours.

Therefore, the effect of the Lerock protective solution is better than that of the iron-containing protective solution.

S45: washing the first heating pipe 11 in which the immersion protection liquid is put;

s46: the first heating pipe 11 is ultrasonically dewatered and dried.

Because the energy of ultrasonic wave can pierce through slit and aperture, consequently can adopt the ultrasonic wave to carry out the dewatering to first heating pipe 11, can avoid contacting first heating pipe 11 to keep the cleanliness factor of first heating pipe 11 and avoid destroying the nickel layer that just solidifies, and through the mode of stoving, make first heating pipe 11 further dry.

Specifically, the total thickness of the first copper layer and the second copper layer on the inner surface of the first heating tube 11 ranges from 0.19mm to 1.31mm, such as 0.19mm, 0.22mm, 0.46mm, 0.48mm, 0.55mm, 0.65mm, 0.74mm, 0.79mm, 1.21mm, 1.31mm, and the like; the thickness of the nickel layer on the inner surface of the first heating pipe 11 is 1.09-2.31 mm, such as 1.09mm, 1.28mm, 1.38mm, 1.41mm, 1.58mm, 1.76mm, 1.78mm, 2.15mm, 2.31mm, etc.

Specifically, the total thickness of the first copper layer and the second copper layer on the outer surface of the first heating tube 11 ranges from 0.48mm to 7.69mm, such as 0.48mm, 0.96mm, 2.54mm, 3.69mm, 3.86mm, 4.02mm, 5.25mm, 5.53mm, 6.44mm, 7.69mm, and the like; the thickness of the nickel layer on the outer surface of the first heating pipe 11 is 1.78-3.49 mm, such as 1.78mm, 2.04mm, 2.12mm, 2.38mm, 2.46mm, 2.59mm, 2.68mm, 2.84mm, 3.3mm, and 3.49 mm.

It should be noted that, between each step, in order to reduce the influence between the steps and optimize the effect of each process step, the first heating pipe 11 may be treated by water washing.

In order to facilitate understanding for those skilled in the art, the present application will be further described with reference to the following examples. The components and their ratios used in the following examples, as well as the copper plating time, are illustrative and not limiting of the present application, nor are the formulations formulated in the examples.

Example 1

A pretreatment of the surface of the first heating pipe 11 comprises the following steps:

step 1, alkaline copper plating: placing the pretreated raw material SUS316L of the first heating pipe 11 into an alkaline copper plating solution for 1min to obtain SUS316L with an alkaline copper plating layer;

step 2, acid copper plating: placing SUS316L with alkaline copper plating layer into acidic copper plating solution for 1min to obtain SUS316L with acidic copper plating layer;

step 3, nickel plating: SUS316L having an acidic copper plating layer was subjected to nickel plating for 15.5min, resulting in SUS316L having a nickel layer.

Example 2

Step 1, alkaline copper plating: placing the pretreated raw material SUS316L of the first heating pipe 11 into an alkaline copper plating solution for 3min to obtain SUS316L with an alkaline copper plating layer;

step 2, acid copper plating: placing SUS316L with alkaline copper plating layer into acidic copper plating solution for 3min to obtain SUS316L with acidic copper plating layer;

Example 3

Step 1, alkaline copper plating: placing the pretreated raw material SUS316L of the first heating pipe 11 into an alkaline copper plating solution for 5min to obtain SUS316L with an alkaline copper plating layer;

step 2, acid copper plating: placing SUS316L with alkaline copper plating layer into acidic copper plating solution for 5min to obtain SUS316L with acidic copper plating layer;

Example 4

Step 1, alkaline copper plating: placing the pretreated raw material SUS316L of the first heating pipe 11 into an alkaline copper plating solution for 8min to obtain SUS316L with an alkaline copper plating layer;

step 2, acid copper plating: placing SUS316L with alkaline copper plating layer into acidic copper plating solution for 8min to obtain SUS316L with acidic copper plating layer;

Example 5

step 2, acid copper plating: placing SUS316L with alkaline copper plating layer into acid copper plating solution for 10min to obtain SUS316L with acid copper plating layer;

Example 6

The salt spray test adopted by the application can be carried out according to the national standard of salt spray test: GB/T2423.17, IEC60068-2-11, ISO4628-3, ASTM B117, JIS-Z2371, JIS-G3141, GJB 150.11A-2009, MIL-STD-810F, MIL-STD-883E and the like. The salt spray test aims to evaluate the salt spray corrosion resistance quality of a product or a metal material, and the judgment of the salt spray test result is just the declaration of the product quality, and whether the judgment result is correct and reasonable is the key for correctly measuring the salt spray corrosion resistance quality of the product or the metal.

The experimental results are as follows:

(1) the influence of the treatment method of the surface of the first heating pipe 11 on the thickness of the copper layer

Alkaline copper plating is firstly carried out on the surfaces of the four first heating pipes 11, then acid copper plating is carried out, in order to visually understand the influence of the alkaline copper plating time period and the acid copper plating time period on the thickness of a copper layer in a copper plating process, a consistent formula can be adopted, the copper plating time period is controlled to be variable, and the specific formula of an alkaline copper solution and the formula of an acid copper solution are respectively as follows: the 1 liter alkaline copper solution used had the composition comprising: the copper ion content is 33.7g, the cuprous cyanide content is 47.4g, and the sodium cyanide content is 15.5 g; the components of the 1 liter acid copper solution used include: 157.3g of copper sulfate and 57.9g of sulfuric acid.

Results shown specifically in table 1 were obtained, and when both the acidic copper plating period and the alkaline copper plating period were increased, the thickness of the copper layer on the surface of the first heating pipe 11 was significantly increased; when the time period of the acid copper plating is longer than the time period of the alkaline copper plating, the thickness of the copper layer outside the first heating tube 11 is significantly larger than that of the copper layer inside the first heating tube 11, and the copper layer has stronger corrosion resistance.

Table 1 influence of the surface treatment method of the first heating pipe 11 of the present application on the copper layer thickness

(2) Influence of the treatment method of the surface of the first heating pipe 11 on the thickness of nickel

By plating the first heating pipe 11 after copper plating with nickel for 15.5 minutes, the plating layer can be made thicker, thereby increasing the thickness of the plating layer, and obtaining the results shown in table 2 specifically, when both the acidic copper plating time period and the alkaline copper plating time period are increased, the thickness of the nickel layer on the surface of the first heating pipe 11 reaches a peak value in example 2; when the period of acid copper plating is longer than the period of alkaline copper plating, the thickness of the nickel layer outside the first heating tube 11 increases more slowly than the thickness of the nickel layer inside the first heating tube 11, which indicates that the thickness of the copper layer has a significant effect on the adhesion of the nickel layer.

TABLE 2 influence of the surface treatment method of the first heating pipe 11 of the present application on the thickness of nickel

(3) Influence of the treatment method of the surface of the first heating pipe 11 on the corrosion resistance

The salt spray test adopted by the application selects GB/T2423.17 national standard to detect the quality of the surface coating of the first heating pipe 11. Specifically, the surfaces of the four first heating pipes 11 were subjected to a salt spray test, and the surfaces of the first heating pipes 11 after the times of 2 hours, 4 hours, 6 hours, and 8 hours were observed and tested, respectively. Specific results are obtained as shown in table 3, when the time period for acid copper plating and the time period for alkaline copper plating reached 3 minutes or more, the smoke detection of 2 hours was passed, but as the time period was prolonged, the end portion of the surface of the first heating tube 11 appeared more or less rusty spots, which provided more directions and possibilities for improvement of the plating layer, and particularly when the time period for acid copper plating exceeded the time period for alkaline copper plating, the plating layer thickness on the surface of the first heating tube 11 was significantly changed, and corrosion resistance was greatly improved.

TABLE 3 Effect of the method of treating the surface of the first heating pipe 11 of the present application on the corrosion prevention

Group of	Salt spray test for 2 hours	Salt spray test for 4 hours	Salt spray test for 6 hours	Salt spray test for 8 hours
					EXAMPLE 1	Failed through	Failed through	Failed through	Failed through
EXAMPLE 2	By passing	Failed through	Failed through	Failed through
					EXAMPLE 3	By passing	By passing	Failed through	Failed through
EXAMPLE 4	By passing	By passing	By passing	Failed through
					EXAMPLE 5	By passing	By passing	By passing	Failed through

EXAMPLE 7

In a similar process flow, the surface of the first heating tube 11 is plated with copper using alkaline copper plating with or without an activator, respectively. Specifically, for example, the alkaline copper plating time was 5min without an activator, and the alkaline copper plating time was 5min with an activator, and comparative tests were respectively performed.

The result is obtained, when the alkaline copper plating time is 5min and no activating agent is present, the thickness of the alkaline copper layer on the inner surface of the first heating pipe 11 is 0.21-0.43 um, and the thickness of the alkaline copper layer on the outer surface of the first heating pipe 11 is 1.19-1.53 um; the thickness of the nickel layer on the inner surface of the first heating pipe 11 is 1.31-1.42 um, and the thickness of the nickel layer on the outer surface of the first heating pipe 11 is 2.90-3.00 um.

When the alkaline copper plating time is 5min and an activator is available, the thickness of the alkaline copper layer on the inner surface of the first heating pipe 11 is 0.49-0.51 um, and the thickness of the alkaline copper layer on the outer surface of the first heating pipe 11 is 1.81-2.70 um; the thickness of the nickel layer on the inner surface of the first heating pipe 11 is 1.17-1.27 um, and the thickness of the nickel layer on the outer surface of the first heating pipe 11 is 2.11-2.30 um.

It can be seen that, in the process of treating the surface of the first heating pipe 11, the activating agent affects the thickness of the plating layer on the surface of the first heating pipe 11, and when other conditions are consistent, the thickness of the inner copper layer on the surface of the first heating pipe 11 is 1.2 to 2.3 times higher than that in the case of no activating agent and the thickness of the outer copper layer on the surface of the first heating pipe 11 is 1.5 to 1.8 times higher than that in the case of no activating agent under the condition of the activating agent.

Different from the prior art, the alkaline copper plating and the acidic copper plating are sequentially and respectively added before nickel plating, the time period for carrying out the acidic copper plating on the surface of the first heating pipe 11 is greater than or equal to the time period for carrying out the alkaline copper plating on the surface of the first heating pipe 11, the thickness of a copper layer on the surface of the first heating pipe 11 is increased, the compactness of the copper layer is increased, the quality and the thickness of the copper layer on the surface of the first heating pipe 11 can be improved by using an activating agent, and the copper layer is protected by nickel plating, so that the surface of the copper layer is prevented from being corroded too fast in the later-use process of the first heating pipe 11, the service life of the first heating pipe 11 is prolonged, the corrosion resistance of the first heating pipe 11 is improved, the first heating pipe 11 is prevented, and the thermocouple group 30 is.

Fig. 7 is a schematic structural diagram of an electronic cigarette 70 according to an embodiment of the present application. The electronic cigarette 70 includes a heating element 71, and the heating element 71 is the heating element 1 disclosed in the above embodiments and is not described herein again.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. The heating component of the electronic cigarette is characterized by comprising a heating pipe and a heat insulation pipe, wherein the heat insulation pipe is sleeved outside the heating pipe, and the heat insulation pipe is made of engineering plastics.

2. The heating assembly of claim 1, wherein the engineering plastic comprises polyetherketone, polyphenylene sulfide, polyimide, or polysulfone.

3. The heating assembly of claim 1, wherein the diameter of the insulated tube ranges from 8.87 to 8.97mm, the length of the insulated tube ranges from 29.0 to 33.3mm, and the wall thickness of the insulated tube ranges from 0.25 to 0.35 mm.

4. The heating assembly of claim 3, further comprising a first support bracket and a second support bracket, wherein the heating tube and the insulating tube are fixed at both ends thereof to the first support bracket and the second support bracket, respectively.

5. The heating assembly of claim 4, wherein the first support frame is provided with a first support portion and a second support portion, the first support portion and the second support portion are distributed in a step shape, the heating tube is arranged on the second support portion, the first support portion is arranged around the heating tube, and the heat insulation tube is arranged on the first support portion.

6. The heating assembly of claim 5, wherein the second support frame defines a first open end having a diameter greater than a diameter of the heating tube and less than a diameter of the insulated tube; the first opening end is sleeved on one end of the heating pipe, and the heat insulation pipe is sleeved on the first opening end.

7. The heating assembly of claim 6, further comprising a thermocouple assembly welded to the heating tube;

8. The heating assembly of claim 7, wherein the heating tube comprises a first heating zone and a second heating zone, the second thermocouple is disposed in the first heating zone, and the first thermocouple and the third thermocouple are disposed in the second heating zone.

9. The heating assembly of claim 8, wherein the heating profile of the first heating zone is a first heating profile and the heating profile of the second heating zone is a second heating profile; the heating pipe is preset with first heating time, second heating time and third heating time, and the third heating time is longer than the first heating time and shorter than the second heating time;

the heating tube is heated for a time less than the first heating time, the temperature of the first heating curve increases with increasing heating time, and the slope of the first heating curve decreases with increasing heating time; the heating time of the heating pipe is longer than the first heating time and shorter than the second heating time, the temperature of the first heating curve decreases with the increase of the heating time, and the slope of the first heating curve increases with the increase of the heating time;

the heating time of the heating pipe is shorter than the second heating time, the temperature of the second heating curve increases along with the increase of the heating time, and the temperature of the second heating curve increases in a stepped manner;

the heating time of the heating pipe is shorter than the third heating time, and the temperature of the first heating area is higher than that of the second heating area; the heating time of the heating pipe is equal to the third heating time, and the temperature of the first heating area is equal to that of the second heating area; the heating time of the heating pipe is longer than the third heating time, and the temperature of the first heating area is lower than that of the second heating area.

10. An electronic cigarette, comprising a heating assembly according to any one of claims 1-9.