CN212299926U

CN212299926U - Indirect heating device and heat treatment equipment

Info

Publication number: CN212299926U
Application number: CN202021028708.5U
Authority: CN
Inventors: 陈云飞; 束东方
Original assignee: Jiangsu Fengdong Thermal Technology Co Ltd
Current assignee: Jiangsu Fengdong Thermal Technology Co Ltd
Priority date: 2020-06-07
Filing date: 2020-06-07
Publication date: 2021-01-05
Anticipated expiration: 2030-06-07

Abstract

The utility model provides an indirect heating device and thermal treatment equipment relates to heat treatment technical field, and this indirect heating device includes heating chamber, heater and protection tube, has seted up the heating hole on the heating chamber, and the heater is worn to establish in the heating hole and is stretched into the heating chamber for heat the heating chamber, the protection tube assembly is established outside the heater in the heating hole and the ring, is used for protecting the heater, and the interval sets up between the inner wall of protection tube and the heater. The protection pipe is annularly arranged outside the heater, and the inner wall of the protection pipe and the heater are arranged at intervals, so that a gap exists between the inner wall of the protection pipe and the heater, carbon deposition on the inner wall of the protection pipe is prevented from contacting the heater, the phenomenon of electrifying short circuit between the heater and the protection pipe is avoided, and the normal operation of the heater is ensured.

Description

Indirect heating device and heat treatment equipment

Technical Field

The utility model relates to a heat treatment technical field particularly, relates to an indirect heating device and equipment for heat treatment.

Background

In the prior art, an indirect heating furnace body usually adopts a tubular heater to heat a furnace, when carburization is carried out, a large amount of gas containing oil and carbon atoms in the furnace enters a protection pipe, and because furnace gas can generate a large amount of carbon deposition in a specific temperature section, and the heater is contacted with the protection pipe, the phenomenon of electrifying and short-circuiting between the heater and the protection pipe can be caused, and the normal operation of the heater is influenced.

In view of this, it is important to design and manufacture an indirect heating apparatus that can ensure the normal operation of the heater and prevent the short circuit phenomenon between the heater and the protection tube.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an indirect heating device, it can prevent to take place circular telegram short circuit phenomenon between heater and the protection tube, guarantees the normal operating of heater.

Another object of the present invention is to provide a heat treatment apparatus, which can prevent the occurrence of short circuit between the heater and the protection tube by indirect heating, thereby ensuring the normal operation of the heater.

The utility model is realized by adopting the following technical scheme.

The utility model provides an indirect heating device, includes heating chamber, heater and protection tube, the heating hole has been seted up on the heating chamber, the heater wears to establish in the heating hole and stretch into the heating chamber is used for right the heating chamber heats, the protection tube assembly is in and the ring is established in the heating hole outside the heater, be used for the protection the heater, just the inner wall of protection tube with interval sets up between the heater.

Further, an insulating supporting block is arranged on the outer side wall of the heating chamber, and the end part of the heater, which extends out of the heating chamber, is assembled on the insulating supporting block.

Furthermore, a bearing support lug is arranged on the outer side wall of the heating chamber, and the insulating support block is arranged on the bearing support lug.

Further, the protection tube comprises an inner protection tube section and an outer protection tube section, the inner protection tube section and the outer protection tube section are arranged outside the heater in a surrounding mode, the inner protection tube section extends towards the heating chamber from the heating hole, and the outer protection tube section is arranged in the heating hole and extends towards the outside of the heating chamber.

Further, an assembly gap is arranged between the inner protection pipe section and the outer protection pipe section.

Further, the inner guard tube segments comprise SiC guard tube segments and the outer guard tube segments comprise ceramic guard tube segments.

Further, still be provided with the protection tube baffle on the lateral wall of heating chamber, the protection tube baffle shelters from outside the heating hole, be used for right outer protection pipeline section carries on spacingly, prevents outer protection pipeline section follow deviate from in the heating hole.

Further, be provided with the heat preservation on the inner wall of heating chamber, the inner wall of heat preservation is provided with the backup pad, the heating hole runs through in proper order the heat preservation with the backup pad, the backup pad is used for supporting the protection tube.

Further, the heater comprises a graphite heater.

The utility model provides a heat treatment equipment, includes outer furnace body and indirect heating device, and indirect heating device includes heating chamber, heater and protection tube, the heating hole has been seted up on the heating chamber, the heater wears to establish in the heating hole and stretch into the heating chamber is used for right the heating chamber heats, the protection tube assembly is in and the ring is established in the heating hole outside the heater, be used for the protection the heater, just the inner wall of protection tube with interval setting between the heater. The heating chamber sets up in the outer furnace body, just be provided with protective gas on the outer furnace body and advance pipe, protective gas calandria, reaction gas and advance pipe and reaction gas calandria, protective gas advance the pipe with the protective gas calandria all with the outer space intercommunication of heating chamber, reaction gas advance the pipe with the reaction gas calandria all with the space intercommunication in the heating chamber.

The utility model discloses following beneficial effect has:

the utility model provides a pair of indirect heating device is through establishing the protection tube ring outside the heater to set up the interval between the inner wall of protection tube and the heater, there is the clearance between the inner wall of protection tube and the heater, avoided carbon deposit and heater contact on the protection tube inner wall, thereby avoided taking place circular telegram short circuit phenomenon between heater and the protection tube, guaranteed the normal operating of heater.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of an overall structure of an indirect heating apparatus according to a first embodiment of the present invention;

fig. 2 is a schematic partial structural view of an indirect heating apparatus according to a first embodiment of the present invention;

fig. 3 is a schematic structural view of a heat treatment apparatus according to a second embodiment of the present invention.

Icon: 10-heat treatment equipment; 100-indirect heating means; 110-a heating chamber; 111-heating the wells; 113-an insulating support block; 115-carrying lugs; 117-protective tube baffle; 130-a heater; 150-a protective tube; 151-inner protective tube section; 153-an outer protective pipe section; 170-an insulating layer; 171-a support plate; 200-outer furnace body; 210-protective gas inlet pipe; 230-shielding gas exhaust pipe; 250-a reaction gas inlet pipe; 270-reactant gas exhaust pipes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As disclosed in the background art, the contact between the heater and the heating tube in the prior art may cause long-term carbon deposition to affect the electrical performance of the heater, and even cause short circuit phenomenon. Meanwhile, because the existing heater usually adopts iron system/ceramic system material, because the power of heater is decided by the heating surface, in addition the heater is also limited by tubular product diameter and length, cause there is not too big degree of freedom in resistance value, so the output power of the heater in the prior art also has the restriction. In addition, the existing protection tube is usually made of aluminum and silica series materials, because the heat conduction efficiency is low, the heat loss is reduced, but the material characteristics also determine that the shock resistance is poor, and the protection tube is easy to crack or even break in the environment with rapid temperature change, so that the protection tube of the series is not suitable for the environment with rapid temperature rise and cooling.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

First embodiment

Referring to fig. 1 and fig. 2, the present embodiment provides an indirect heating apparatus 100, which is suitable for a heat treatment furnace body, has a good heating effect, and can be suitable for an environment with rapid temperature rise and cooling, and meanwhile, can avoid an electrical short circuit phenomenon caused by carbon deposition.

The indirect heating apparatus 100 provided by this embodiment includes a heating chamber 110, a heater 130, and a protection tube 150, wherein a heating hole 111 is opened on the heating chamber 110, the heater 130 is inserted into the heating hole 111 and extends into the heating chamber 110 for heating the heating chamber 110, the protection tube 150 is fitted in the heating hole 111 and is annularly disposed outside the heater 130 for protecting the heater 130, and an inner wall of the protection tube 150 and the heater 130 are spaced apart from each other.

In this embodiment, the heaters 130 are tube heaters 130, and two heaters 130 are provided, and the two heaters 130 are respectively disposed on the upper and lower sides of the heating chamber 110, and a protection pipe 150 is disposed around each heater 130. Specifically, the heater 130 employs a resistive heating method, so that an atmospheric reaction occurs between the gas in the heating chamber 110 and the workpiece in the heating chamber 110.

In this embodiment, heater 130 includes graphite heater 130, heater 130 is made of graphite material, and is easy and convenient to process, and the diameter of heater 130 can be freely selected, and the resistance value can be changed, so that the output power can be accurately adjusted. In addition, due to the material characteristics of graphite, the risk of thermal deformation does not occur, and the worry of creep is avoided.

In the present embodiment, the heating chamber 110 is provided in the heat treatment furnace body, and can perform heat treatment processes such as carburizing, nitriding, carbonitriding, and brazing. The protection tube 150 is arranged outside the heater 130 in a surrounding mode, and the inner wall of the protection tube 150 and the heater 130 are arranged at intervals, so that a gap exists between the inner wall of the protection tube 150 and the heater 130, carbon deposition on the inner wall of the protection tube 150 is prevented from contacting the heater 130, the phenomenon of short circuit caused by electrifying between the heater 130 and the protection tube 150 is avoided, and normal operation of the heater 130 is guaranteed.

In the present embodiment, the outside of the heating chamber 110 is provided with an insulating support block 113, and the end of the heater 130 protruding out of the heating chamber 110 is fitted on the insulating support block 113. Specifically, the insulating support block 113 is disposed outside the heating chamber 110, so that the insulating support block 113 is not prone to carbon deposition, and the risk of carbon deposition is greatly reduced. In addition, the insulating support block 113 is provided outside, so that the gas in the heating chamber 110 is prevented from damaging and corroding the insulating support block 113.

It should be noted that, in this embodiment, the insulating support block 113 is composed of an upper support block and a lower support block, a bearing hole for assembling the end portion of the heater 130 is formed between the upper support block and the lower support block, the end portion of the heater 130 is fixed by the upper support block and the lower support block, the lower support block mainly plays a bearing role, and the upper support block mainly plays a limiting role.

In this embodiment, a side wall outside the heating chamber 110 is provided with a carrying lug 115, and an insulating support block 113 is provided on the carrying lug 115. Specifically, the support lugs 115 are welded to the outer side wall of the heating chamber 110, the support lugs 115 are disposed on the side walls of both sides of the heating chamber 110, an insulating support block 113 is fixedly disposed on each support lug 115, and the end of the heater 130 is assembled on the insulating support block 113, so that the heater 130 is supported by the support lugs 115 on both sides.

The protection pipe 150 includes an inner protection pipe segment 151 and an outer protection pipe segment 153, the inner protection pipe segment 151 and the outer protection pipe segment 153 are both disposed around the heater 130, the inner protection pipe segment 151 extends from the heating hole 111 toward the inside of the heating chamber 110, and the outer protection pipe segment 153 is disposed in the heating hole 111 and extends toward the outside of the heating chamber 110. It should be noted that both the inner protection section and the outer protection section are partially disposed in the heating hole 111, the inner protection section extends from the heating hole 111 to the inside of the heating chamber 110, the outer protection section extends from the heating hole 111 to the outside of the heating chamber 110, the length of the inner protection section is much longer than that of the outer protection tube 150, and the outer portion of the heater 130 is mainly protected by the inner protection section disposed around the inner protection section.

In this embodiment, a fitting gap is provided between the inner guard tube segment 151 and the outer guard tube segment 153. Specifically, a split design is adopted between the inner protection pipe segment 151 and the outer protection pipe segment 153, and the split design is adopted to reduce the heat conduction and the temperature between the inner protection pipe segment 151 and the outer protection pipe segment 153, so that the temperature of the outer protection pipe segment 153 is greatly reduced, and the function of rapid temperature rise and drop can be realized. In addition, the temperature of the outer guard pipe section 153 can be suppressed by adopting the split design, and the uniformity of the temperature distribution of the inner guard pipe section 151 can be improved.

In the present embodiment, the inner guard tube segment 151 comprises a segment of SiC guard tube 150 and the outer guard tube segment 153 comprises a segment of ceramic guard tube 150. Specifically, the inner protection tube segment 151 is made of SiC material, which has a strong thermal shock resistance, and thus is very suitable for use in environments with rapid temperature rise and cooling. And the inner protection pipe section 151 at the position of the heating belt is made of SiC material, has a thermal shock resistance cavity and can be used in a high-temperature environment.

The outer shielding pipe section 153 is made of ceramic, such as alumina, silica, etc., and has low cost, low heat conduction efficiency, and reduced heat dissipation capacity, and in addition, the outer shielding pipe section 153 partially extends out of the heating hole 111 to the outside of the heating chamber 110 and is separately provided from the inner shielding pipe section 151, so that the temperature can be rapidly reduced.

In this embodiment, a protective tube baffle 117 is further disposed on the outer wall of the heating chamber 110, and the protective tube baffle 117 is shielded outside the heating hole 111 and used for limiting the outer protective tube section 153 and preventing the outer protective tube section 153 from coming out of the heating hole 111.

In this embodiment, the insulating layer 170 is disposed on the inner wall of the heating chamber 110, the supporting plate 171 is disposed on the inner wall of the insulating layer 170, the heating hole 111 sequentially penetrates through the insulating layer 170 and the supporting plate 171, and the supporting plate 171 is used to support the protection pipe 150. Specifically, a support plate 171 is mounted on the surface of the insulating layer 170, and the support plate 171 is a carbon composite material such as a stainless material, a molybdenum material, or graphite. By providing the support plate 171, a function of supporting the inner protective tube segment 151 can be performed.

In this embodiment, a furnace support for placing a workpiece is further provided in the heating chamber 110, and the furnace support is located at the center of the heating chamber 110.

In summary, in the indirect heating apparatus 100 provided in this embodiment, the protection tube 150 is annularly disposed outside the heater 130, and the inner wall of the protection tube 150 and the heater 130 are disposed at intervals, so that a gap exists between the inner wall of the protection tube 150 and the heater 130, and carbon deposition on the inner wall of the protection tube 150 is prevented from contacting the heater 130, thereby preventing an electrical short circuit from occurring between the heater 130 and the protection tube 150, and ensuring normal operation of the heater 130. And the inner protection pipe segment 151 is made of SiC material, has strong shock resistance and is suitable for the environment of rapid cooling and rapid heating. The heat conduction and temperature between the inner protection pipe segment 151 and the outer protection pipe segment 153 are reduced through the inner protection pipe segment 151 and the outer protection pipe segment 153 which are designed in a separated mode, so that the temperature of the outer protection pipe segment 153 is greatly reduced, and the function that the heater 130 can realize rapid temperature rise and drop is guaranteed.

Second embodiment

Referring to fig. 3, the present embodiment provides a heat treatment apparatus 10, which includes an outer furnace body 200 and an indirect heating device 100, wherein the basic structure and principle of the indirect heating device 100 and the technical effects thereof are the same as those of the first embodiment, and for the sake of brief description, reference may be made to the corresponding contents of the first embodiment where no part is mentioned in the present embodiment.

The indirect heating apparatus 100 includes a heating chamber 110, a heater 130, and a protection tube 150, wherein the heating chamber 110 is provided with a heating hole 111, the heater 130 is inserted into the heating hole 111 and extends into the heating chamber 110 for heating the heating chamber 110, the protection tube 150 is assembled in the heating hole 111 and is annularly arranged outside the heater 130 for protecting the heater 130, and an inner wall of the protection tube 150 and the heater 130 are spaced apart from each other. The heating chamber 110 is disposed in the outer furnace body 200, and the outer furnace body 200 is provided with a shielding gas inlet pipe 210, a shielding gas discharge pipe 230, a reaction gas inlet pipe 250, and a reaction gas discharge pipe 270, the shielding gas inlet pipe 210 and the shielding gas discharge pipe 230 are both communicated with the space outside the heating chamber 110, and the reaction gas inlet pipe 250 and the reaction gas discharge pipe 270 are both communicated with the space inside the heating chamber 110.

In this embodiment, a shielding gas, for example, nitrogen gas is introduced into the cavity outside the heating chamber 110 through the shielding gas inlet pipe 210 to form a shielding atmosphere outside the heating chamber 110, thereby preventing the entry of foreign gases into the heating chamber 110, a reaction gas, for example, ammonia gas, carbon dioxide gas, etc., is introduced through the reaction gas inlet pipe 250 on the heating chamber 110, exhaust gas generated in the heating chamber 110 and the shielding gas flowing into the heating chamber 110 are discharged through the reaction gas discharge pipe 270 on the heating chamber 110, and the shielding gas in the cavity outside the heating chamber 110 after the final treatment is discharged through the shielding gas discharge pipe 230. By introducing the shielding gas, the original reactive impurity gas in the heating chamber 110 is greatly reduced, and the leakage of the reactive gas in the heating chamber 110 to the outside of the heating chamber 110 is also avoided.

It should be noted that in the present embodiment, the shielding gas inlet pipe 210 and the shielding gas exhaust pipe 230 are disposed at two opposite diagonal ends so that the shielding gas can be sufficiently filled in the cavity outside the heating chamber 110, and the reaction gas inlet pipe 250 and the reaction gas exhaust pipe 270 are disposed at two opposite diagonal ends so that the reaction gas can be sufficiently filled in the heating chamber 110.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The indirect heating device is characterized by comprising a heating chamber, a heater and a protection pipe, wherein a heating hole is formed in the heating chamber, the heater is arranged in the heating hole in a penetrating mode and stretches into the heating chamber to be used for heating the heating chamber, the protection pipe is assembled in the heating hole and is arranged outside the heater in a surrounding mode to protect the heater, and the inner wall of the protection pipe and the heater are arranged at intervals.

2. The indirect heating apparatus of claim 1, wherein an outer side wall of the heating chamber is provided with an insulating support block, and an end of the heater protruding from the heating chamber is fitted on the insulating support block.

3. The indirect heating apparatus of claim 2, wherein the heating chamber is provided with a carrying lug on an outer side wall thereof, and the insulating support block is provided on the carrying lug.

4. The indirect heating apparatus of claim 1, wherein the protective tube comprises an inner protective tube section and an outer protective tube section, the inner protective tube section and the outer protective tube section are both disposed around the heater, the inner protective tube section extends from the heating bore toward the inside of the heating chamber, and the outer protective tube section is disposed inside the heating bore and extends toward the outside of the heating chamber.

5. The indirect heating device of claim 4, wherein a fit-up gap is provided between the inner guard tube section and the outer guard tube section.

6. The indirect heating device of claim 5, wherein the inner guard tube segments comprise SiC guard tube segments and the outer guard tube segments comprise ceramic guard tube segments.

7. The indirect heating device of claim 4, wherein a protection tube baffle is further disposed on an outer sidewall of the heating chamber, and the protection tube baffle is shielded outside the heating hole and used for limiting the outer protection tube section and preventing the outer protection tube section from falling out of the heating hole.

8. The indirect heating apparatus of any one of claims 1 to 7, wherein an insulating layer is disposed on an inner wall of the heating chamber, a support plate is disposed on an inner wall of the insulating layer, the heating hole penetrates the insulating layer and the support plate in sequence, and the support plate is used for supporting the protection pipe.

9. The indirect heating device of any of claims 1-7, wherein the heater comprises a graphite heater.

10. A heat treatment apparatus comprising an outer furnace body and the indirect heating apparatus according to any one of claims 1 to 9, wherein the heating chamber is disposed in the outer furnace body, and a shielding gas inlet pipe, a shielding gas exhaust pipe, a reaction gas inlet pipe, and a reaction gas exhaust pipe are disposed on the outer furnace body, the shielding gas inlet pipe and the shielding gas exhaust pipe are both communicated with a space outside the heating chamber, and the reaction gas inlet pipe and the reaction gas exhaust pipe are both communicated with a space inside the heating chamber.