CN216644942U

CN216644942U - Short-flow cooling cycle sintering furnace

Info

Publication number: CN216644942U
Application number: CN202220001112.9U
Authority: CN
Inventors: 夏超; 张小元; 王汉斌; 李川宁
Original assignee: Shengliheng Ningxia Vacuum Technology Co ltd
Current assignee: Shengliheng Ningxia Vacuum Technology Co ltd
Priority date: 2022-01-03
Filing date: 2022-01-03
Publication date: 2022-05-31
Anticipated expiration: 2032-01-03

Abstract

The utility model provides a short-flow cooling cycle sintering furnace, and belongs to the technical field of vacuum sintering equipment. The sintering furnace comprises a furnace barrel and furnace covers arranged at two ends of the furnace barrel, wherein a heat shield main body is arranged in the furnace barrel, a circulating cooling cavity is formed between the heat shield main body and the furnace barrel, the sintering furnace further comprises a cooling circulating fan, a circulating inlet pipe fitting is arranged at the inlet end of the cooling circulating fan, a circulating outlet pipe fitting is arranged at the outlet end of the cooling circulating fan, the circulating inlet pipe fitting is communicated with one end of the circulating cooling cavity, the circulating outlet pipe fitting is communicated with the other end of the circulating cooling cavity, a cooling jacket is arranged on the outer side of the circulating inlet pipe fitting and/or the circulating outlet pipe fitting, and a refrigerating medium can be introduced into the cooling jacket. After the sintering operation, when the temperature in the heat shield main body is reduced to a proper temperature, the cooling circulating fan is started, so that the gas phase in the circulating cooling cavity is circulated to accelerate cooling. Meanwhile, the method is favorable for establishing gas phase circulation at a higher temperature, and further shortens the cooling period.

Description

Short-flow cooling cycle sintering furnace

Technical Field

The utility model belongs to the technical field of vacuum sintering equipment, and particularly relates to a short-flow cooling period sintering furnace.

Background

The vacuum graphite sintering furnace is equipment for sintering a hard alloy cutter head and various metal powder pressed bodies at high temperature or ultrahigh temperature (the temperature reaches more than 2600 ℃) in a vacuum environment or under a protective atmosphere, and mainly comprises an electric furnace body, a vacuum system, a water cooling system and the like. For example, chinese patent No. 201911388388.6 discloses a heat shield isolated ultra-high temperature vacuum sintering furnace, which comprises a furnace tube, and a heater, a heat shield, a cooling member and an isolating member arranged in the furnace tube.

The actual working temperature of the air sintering furnace exceeds 2000 ℃, even can reach 2600 ℃, after sintering is finished, the temperature needs to be naturally reduced to about 600 ℃, then the temperature is continuously reduced through internal gas phase circulation, and the whole temperature reduction period needs to last for 3-4 days. If the internal gas phase circulation cooling is started at a higher temperature, the gas phase circulation pipeline is damaged greatly.

SUMMERY OF THE UTILITY MODEL

Based on the technical scheme, the utility model provides the sintering furnace with the short flow cooling period, and aims to solve the technical problem that the cooling period of the vacuum sintering furnace is long in the prior art.

A short-flow cooling period sintering furnace comprises a furnace barrel and furnace covers arranged at two ends of the furnace barrel, wherein a heat shield main body is arranged in the furnace barrel, a circulating cooling cavity is formed between the heat shield main body and the furnace barrel, the short-flow cooling period sintering furnace also comprises a cooling circulating fan, a circulating inlet pipe fitting is arranged at the inlet end of the cooling circulating fan, a circulating outlet pipe fitting is arranged at the outlet end of the cooling circulating fan, the circulating inlet pipe fitting is communicated with one end of the circulating cooling cavity, and the circulating outlet pipe fitting is communicated with the other end of the circulating cooling cavity; and a cooling jacket is arranged on the outer side of the circulation inlet pipe fitting and/or the circulation outlet pipe fitting, and a refrigerating medium can be introduced into the cooling jacket.

Preferably, the cooling jackets are arranged in sections.

Preferably, a first cut-off valve is arranged on the circulating inlet pipe fitting or the circulating outlet pipe fitting, a connecting pipe is arranged in front of the valve of the first cut-off valve, and a second cut-off valve is arranged on the connecting pipe; and the other end of the connecting pipe is connected with a Roots blower.

Preferably, the inlet end of the Roots blower is communicated with the heat shield main body.

Preferably, the other end of the connecting pipe is positioned in front of the Roots blower and is also provided with a dewaxing device; the gas inlet end of the dewaxing device is connected with the connecting pipe, and the gas outlet end of the dewaxing device is connected with the inlet of the Roots blower.

Preferably, the cooling circulating fan comprises a motor, a radiator and a water cooling cavity arranged at the inlet end of the radiator, and a water cooling coil is arranged in the water cooling cavity or on the periphery of the water cooling cavity.

Preferably, a heat shield end cover assembly is arranged on the inner side of the furnace cover and comprises a front shield, and the front shield can cover the end part of the heat shield main body.

Preferably, the heat shield end cover assembly further comprises a sliding rail and a driving piece, the sliding rail is fixedly arranged on the furnace cover, the front shield is arranged on the sliding rail in a sliding mode, the output end of the driving piece is connected with the front shield, and when the furnace cover is fitted to the furnace barrel, the driving piece can drive the cover to be fitted to the end portion of the heat shield main body, the front shield is separated from the heat shield main body.

Preferably, the slide rail is perpendicular to the cross-sectional direction of bell, the side of front screen is provided with the slip ear, slip ear slidable mounting in on the slide rail, the driving piece sets up the rear end of front screen to the pulling front screen is followed the slide rail slides.

Preferably, the driving member can drive the front screen to linearly displace 1cm-5 cm.

Compared with the prior art, the utility model has at least the following advantages:

set up exit end and entry end all with the cooling circulating fan of circulation cooling chamber intercommunication to set up the cooling jacket in the periphery of its circulation entry pipe fitting and circulation export pipe fitting, after the sintering operation, work as the temperature reduces to suitable temperature in the heat shield main part, starts cooling circulating fan makes and is located the gaseous phase circulation of circulation cooling intracavity is in order to lower the temperature with higher speed. In the gas phase circulation process, a cooling medium is introduced into the cooling jacket, and when the pipe wall of the circulation inlet pipe fitting and/or the pipe wall of the circulation outlet pipe fitting are cooled, part of cold energy and hot circulating gas exchange heat, so that the temperature of the circulating gas is reduced, and the cooling of a soaking zone in the heat shield main body is accelerated. Meanwhile, a refrigerating medium is introduced into the cooling jacket, so that the temperature of the pipe wall of the circulation inlet pipe fitting and/or the circulation outlet pipe fitting is reduced, the circulation inlet pipe fitting and/or the circulation outlet pipe fitting is protected from being damaged by high temperature, the establishment of gas phase circulation at higher temperature is facilitated, and the cooling period is further shortened. Practice shows that the cooling jacket is arranged, so that gas phase circulation can be established when the temperature in the heat shield main body is 1000-1200 ℃, and the circulation inlet pipe fitting and/or the circulation outlet pipe fitting are not damaged, so that the cooling period can be greatly shortened, and the cooling rate is improved.

Drawings

FIG. 1 is a front view of a short-run cool-down cycle sintering furnace according to one embodiment.

Fig. 2 is a schematic cross-sectional view of a short-cycle temperature-reduction sintering furnace according to an embodiment.

FIG. 3 is a schematic cross-sectional view of a short-cycle temperature reduction sintering furnace according to an embodiment.

In the figure: the short-flow cooling period sintering furnace 10, the furnace barrel 100, the furnace cover 200, the heat shield main body 300, the heat shield end cover assembly 400, the front shield 410, the sliding lug 411, the sliding rail 420, the driving piece 430, the circulating cooling cavity 500, the cooling circulating fan 700, the motor 701, the radiator 702, the water cooling cavity 703, the water cooling coil 704, the circulating inlet pipe 710, the circulating outlet pipe 720, the cooling jacket 730, the first cut-off valve 740, the connecting pipe 750, the second cut-off valve 760, the roots fan 770 and the dewaxing device 780.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments of the present invention, and the present invention is not limited to the following specific embodiments.

It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar parts. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the patent, and the specific meanings of the terms will be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 3, in a specific embodiment, a short-flow temperature-reduction-period sintering furnace 10 includes a furnace cylinder 100 and furnace covers 200 disposed at two ends of the furnace cylinder 100, a heat shield main body 300 is disposed in the furnace cylinder 200, a circulating temperature-reduction chamber 500 is formed between the heat shield main body 300 and the furnace cylinder 100, the short-flow temperature-reduction-period sintering furnace 10 further includes a temperature-reduction circulating fan 700, a circulating inlet pipe 710 is disposed at an inlet end of the temperature-reduction circulating fan 700, a circulating outlet pipe 720 is disposed at an outlet end of the temperature-reduction circulating fan 700, the circulating inlet pipe 710 is communicated with one end of the circulating temperature-reduction chamber 500, and the circulating outlet pipe 720 is communicated with the other end of the circulating temperature-reduction chamber 500. The circulation inlet pipe 710 and/or the circulation outlet pipe 720 are provided with a cooling jacket 730 on the outside, and a refrigerant can be introduced into the cooling jacket 730.

After the sintering operation is finished, when the temperature in the heat shield main body 300 is reduced to a proper temperature, the cooling circulating fan is started, so that the cooling circulating fan is positioned in the gas phase circulation in the circulating cooling cavity 500 to accelerate cooling. In the gas phase circulation process, a cooling medium is introduced into the cooling jacket 730, the pipe wall of the circulation inlet pipe 710 and/or the pipe wall of the circulation outlet pipe 720 are cooled, meanwhile, partial cold energy and hot circulation gas exchange heat, the temperature of the circulation gas is reduced, and the cooling of the soaking zone in the heat shield main body 300 is accelerated. Meanwhile, a refrigeration medium is introduced into the cooling jacket 730 to reduce the temperature of the pipe wall of the circulation inlet pipe 710 and/or the circulation outlet pipe 720 and protect the circulation inlet pipe 710 and/or the circulation outlet pipe 720 from high-temperature damage, so that the establishment of gas-phase circulation at a higher temperature is facilitated, and the cooling period is further shortened. Practice shows that by arranging the cooling jacket 730, gas phase circulation can be established when the temperature in the heat shield main body 300 is 1000-1200 ℃, and the circulation inlet pipe 710 and/or the circulation outlet pipe 720 are not damaged, so that the cooling period can be greatly shortened, and the cooling rate can be increased.

Preferably, the refrigeration medium is circulating water or chilled water.

Further, the cooling jacket 730 is provided in stages for easy installation and to improve water cooling efficiency. That is, the cooling jacket 730 is sectionally disposed outside the circulation inlet pipe member 710 and/or the circulation outlet pipe member 720 with a place having a connection flange as a sectionalized position on the circulation inlet pipe member 710 and/or the circulation outlet pipe member 720. On one hand, the cooling jacket 730 is convenient to manufacture and install, and on the other hand, the cooling jacket 730 with a short flow path is beneficial to rapid circulation of a refrigerating medium, so that the cooling efficiency is improved.

In some embodiments, a first cut-off valve 740 is disposed on the circulation inlet pipe 710 or the circulation outlet pipe 720, a connection pipe 750 is disposed in front of the first cut-off valve 740, a second cut-off valve 760 is disposed on the connection pipe 750, and a roots blower 770 is connected to the other end of the connection pipe 750. Before sintering, the second shut-off valve 760 is opened, and the circulating cooling chamber 500 is vacuumized or replaced by inert gas through the roots blower 770.

In some embodiments, the inlet end of the roots blower 770 communicates with the heat shield body 300 to enable evacuation or inert gas replacement of the soak zone within the heat shield body 300 prior to the sintering operation.

In some embodiments, the other end of the connecting pipe 750 is located in front of the roots blower 770, and a dewaxing device 780 is further provided, wherein an air inlet end of the dewaxing device 780 is connected to the connecting pipe 750, and an air outlet end of the dewaxing device 780 is connected to an inlet of the roots blower 770. Before and after the sintering operation, the exhaust gas is first purified by the dewaxing device 780 and then discharged, thereby reducing the pollution of the sintering exhaust gas to the workshop environment.

In an embodiment, the cooling circulation fan 700 includes a motor 701, a radiator 702, and a water-cooling cavity 703 disposed at an inlet end of the radiator 702, and a water-cooling coil 704 is disposed inside or outside the water-cooling cavity 703. The gas in the short-flow temperature-reduction-period sintering furnace 10 firstly enters the water-cooling cavity 703 through the circulating inlet pipe 710 under the action of the back pressure of the radiator 702, and is further cooled in the water-cooling cavity 703 and then is blown into the circulating temperature-reduction cavity 500 through the radiator 702, so that the temperature-reduction rate is further improved, and the temperature-reduction period is shortened.

In a preferred embodiment, a heat shield end cover assembly 400 is disposed inside the furnace cover 200, the heat shield end cover assembly 400 includes a front shield 410, and the front shield 410 can cover the end of the heat shield main body 300 to ensure the thermal field environment and sealing performance of the soaking zone in the heat shield main body 300.

For further quickening cooling rate, shorten the cooling cycle, heat shield end cover assembly 400 still includes slide rail 420 and driving piece 430, slide rail 420 is fixed to be set up on the bell 200, preceding screen 410 slide set up in on the slide rail 420, the output of driving piece 430 is connected preceding screen 410, works as bell 200 lid fits when the stove section of thick bamboo 100, driving piece 430 can drive the lid fit the tip of heat shield main part 300 preceding screen 410 with heat shield main part 300 separation.

Specifically, the furnace cover 200 can cover both sides of the furnace tube 100 to form a closed sintering space. The heat shield main body 300 is disposed in the furnace tube 100, a soaking zone for high-temperature sintering is formed inside the heat shield main body 300, and a low-temperature zone (hereinafter referred to as a circulating cooling chamber 500) is formed between the heat shield main body 300 and the furnace tube 100. Generally, when the furnace cover 200 is covered on the furnace cylinder 100, the front screen 410 is covered on the end of the heat shield main body 300 to ensure the tightness of the heat shield main body 300. In the present invention, the heat shield end cap assembly 400 including the front shield 410, the slide rail 420 and the driving member 430 is disposed on the furnace cover 200, and when sintering at a high temperature, the driving member 430 applies a force to the front shield 410, the force being close to the end of the heat shield main body 300, thereby improving the sealing performance between the front shield 410 and the heat shield main body 300. After the sintering is accomplished, naturally cool down to after the suitable temperature (generally, for avoiding high-temperature gas to damage outside pipe fitting, will the temperature in soaking district reduces to below 600 ℃, opens the gas circulation cooling), driving piece 430 to preceding screen 410 applys one and keeps away from the power of the tip of heat shield main part 300 makes preceding screen 410 with heat shield main part 300 separates, forms the gas exchange passageway, accelerates the cooling rate in soaking district in the heat shield main part 300 to be favorable to shortening the cooling time, accelerate cooling rate. Practice shows that when the cooling jacket 730 is arranged and the heat shield end cover assembly 400 is arranged, the temperature reduction period of the short-flow temperature reduction period sintering furnace 10 is shortened to be within 60 hours.

For example, the slide rail 420 is disposed along a direction perpendicular to a cross section of the furnace cover 200, a slide lug 411 is disposed on a side surface of the front screen 410, the slide lug 411 is slidably mounted on the slide rail 420, and the driving member 430 is disposed at a rear end of the front screen 410 to pull the front screen 410 to slide along the slide rail 420. The slide rail 420 supports the front panel 410 to keep the front panel coaxial with the heat shield body 300, and guides the front panel 410 to slide along the slide rail 420 under the action of the driving member 430.

Preferably, the driving member 430 is capable of driving the front panel 410 to be linearly displaced by 1cm to 5cm, so as to ensure a large area of a gas exchange passage formed between the front panel 410 and the end of the heat shield main body 300.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A short-flow cooling period sintering furnace comprises a furnace barrel and furnace covers arranged at two ends of the furnace barrel, wherein a heat shield main body is arranged in the furnace barrel, and a circulating cooling cavity is formed between the heat shield main body and the furnace barrel; and a cooling jacket is arranged on the outer side of the circulation inlet pipe fitting and/or the circulation outlet pipe fitting, and a refrigerating medium can be introduced into the cooling jacket.

2. The short pass reduced temperature cycle sintering furnace of claim 1, wherein the cooling jackets are arranged in stages.

3. The short-flow temperature-reduction cycle sintering furnace according to claim 1 or 2, wherein a first cut-off valve is arranged on the circulation inlet pipe or the circulation outlet pipe, a connecting pipe is arranged in front of the first cut-off valve, and a second cut-off valve is arranged on the connecting pipe; and the other end of the connecting pipe is connected with a Roots blower.

4. The short pass reduced temperature cycle sintering furnace of claim 3 wherein the inlet end of the Roots blower communicates with the heat shield body.

5. The short-flow temperature-reducing periodic sintering furnace according to claim 3, wherein the other end of the connecting pipe is provided with a dewaxing device before the Roots blower; the gas inlet end of the dewaxing device is connected with the connecting pipe, and the gas outlet end of the dewaxing device is connected with the inlet of the Roots blower.

6. The short-process cooling cycle sintering furnace according to claim 1, wherein the cooling circulation fan comprises a motor, a radiator and a water cooling cavity arranged at the inlet end of the radiator, and a water cooling coil is arranged in or on the periphery of the water cooling cavity.

7. The short pass reduced temperature cycle sintering furnace of claim 1 wherein the inside of the furnace covers are provided with heat shield end cap assemblies comprising front shields that can be fitted over the ends of the heat shield body.

8. The short cycle sintering furnace with reduced temperature as claimed in claim 7, wherein the heat shield end cap assembly further comprises a slide rail and a driving member, the slide rail is fixedly disposed on the furnace cover, the front screen is slidably disposed on the slide rail, an output end of the driving member is connected to the front screen, and when the furnace cover is covered on the furnace barrel, the driving member can drive the front screen covering the end of the heat shield main body to separate from the heat shield main body.

9. The short-process cooling cycle sintering furnace as claimed in claim 8, wherein the slide rails are arranged along a cross section perpendicular to the furnace cover, the side surfaces of the front screen are provided with sliding lugs, the sliding lugs are slidably mounted on the slide rails, and the driving member is arranged at the rear end of the front screen to pull the front screen to slide along the slide rails.

10. The short pass reduced temperature cycle sintering furnace of claim 9, wherein the drive member is capable of driving the front screen to move linearly between 1cm and 5 cm.