High-temperature vacuum sintering device for lining tetrafluoro material

Abstract

This utility model belongs to the field of vacuum sintering furnace technology, specifically disclosing a high-temperature vacuum sintering device for PTFE-lined materials. It includes a furnace body, a firing chamber located at the lower part of the furnace body, and electric heaters installed at the front and rear of the firing chamber. A base is fixed to the bottom of the firing chamber, a cooling chamber is located above the firing chamber, and a filter chamber is located above the cooling chamber. This high-temperature vacuum sintering device for PTFE-lined materials, by providing a filter chamber above the cooling chamber, allows fluoride gas generated during sintering inside the furnace body to enter the lower three-way pipe from the gas channel after the vacuum pump is turned on. The gas then passes through a short pipe and an upper three-way pipe into the ceramic filter element. This filter element can withstand temperatures up to 900°C and can directly filter particulate impurities in the flue gas. The filter element's movement is prevented by the side support frames and the lateral limiting rods, thus preventing it from affecting the gas filtration accuracy and solving the problem of inconvenient adsorption of harmful gases.

Description

Technical Field

[0001] This utility model relates to the field of vacuum sintering furnace technology, specifically a high-temperature vacuum sintering device for PTFE-lined materials. Background Technology

[0002] High-temperature sintering of PTFE-lined materials involves heating and firing objects coated with polytetrafluoroethylene (PTFE) powder, causing the powder to solidify and take shape. The furnace environment is a high-temperature vacuum state, and the temperature inside the furnace is maintained at around 300°C for a long time, which is conducive to the melting of the material and the formation of a dense structure.

[0003] During the firing process, polytetrafluoroethylene inevitably produces toxic fluoride gases. Therefore, a vacuum pump is needed to control the gas pressure inside the furnace in real time and remove harmful gases. Traditional activated carbon materials may desorb at high temperatures (above 60°C). Directly using activated carbon to filter high-temperature gases will lead to adsorption failure and may even accelerate the release of pollutants, thus failing to achieve gas purification.

[0004] Now, a novel high-temperature vacuum sintering apparatus for PTFE-lined materials is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature vacuum sintering device for PTFE-lined materials to solve the problem of inconvenience in adsorbing harmful gases mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature vacuum sintering device for PTFE-lined materials, comprising a furnace body, a firing chamber disposed at the lower part of the furnace body, and electric heaters respectively installed at the front and rear of the firing chamber, a base fixed at the bottom of the firing chamber, a cooling chamber disposed above the firing chamber, and a filter chamber disposed above the cooling chamber, support frames respectively fixed on both sides of the bottom of the filter chamber, and a ceramic filter element horizontally installed at the center between the two support frames, and limit rods horizontally fixed at the top, bottom, front, and rear of the two support frames, a vacuum pump installed at the top of the furnace body, and a connecting pipe fixed between the left side of the vacuum pump and the firing chamber, through grooves respectively disposed on both sides between the firing chamber and the cooling chamber, a T-pipe I fixed at the bottom between the two through grooves, and a short pipe fixed at the center of the bottom of the T-pipe I, and gas grooves respectively disposed on both sides of the bottom of the cooling chamber, and a T-pipe II fixed at the top between the two gas grooves.

[0007] As a further technical solution of this utility model, the short pipe is connected between the three-way pipe one and the three-way pipe two, and the two sides of the top end of the three-way pipe one pass through the support frame and are connected to the ceramic filter element.

[0008] As a further technical solution of this utility model, fans are installed on both sides of the rear of the cooling chamber, a spiral tube is wound between the left and right sides of the outside of the three-way pipe, a liquid pump is installed at the center of the upper right corner of the outside of the furnace body, and a valve is installed at the center of the upper left corner of the outside of the furnace body.

[0009] As a further technical solution of this utility model, the liquid pump is fixedly connected to the right side of the spiral tube, and the valve is fixedly connected to the left side of the spiral tube.

[0010] As a further technical solution of this utility model, a slot is provided inside the left side of the furnace body, and a furnace door is movably hinged to the rear of the slot. Tracks are provided horizontally at the center and bottom of the left side of the furnace body, and sliders are movably connected in the tracks. A heat preservation plate is fixed longitudinally on the left side between the upper and lower sliders.

[0011] As a further technical solution of this utility model, the slider moves back and forth along the track, and the insulation board is pressed against the left side of the furnace door and the slot.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the high-temperature vacuum sintering device with PTFE-lined material not only achieves effective treatment of waste gas and pre-cooling of gas, but also prevents the furnace body from cooling down;

[0013] (1) By setting a filter chamber above the cooling chamber, the fluoride gas generated during sintering inside the furnace body 1 will enter the three-way pipe 2 from the gas groove after the vacuum pump is turned on, and enter the ceramic filter element through the short pipe and the three-way pipe 1. This material can withstand a high temperature of 900°C and can directly filter particulate impurities in the flue gas. Under the restriction of the side support frame and the transverse limit rod, the filter element can be prevented from shaking and affecting the accuracy of gas filtration, thus ensuring the complete filtration of exhaust gas.

[0014] (2) By winding a spiral tube between the left and right sides of the outside of the three-way pipe two, the flue gas is first guided to the three-way pipe two through the gas groove before entering the filter chamber. The outer surface of the three-way pipe two is wound with a spiral tube for cooling. The liquid pump is started to inject cooling water into the spiral tube from the right side and then out from the valve opened on the left side. The flue gas passing through this place can be pre-cooled and the cooling path is extended. It can be used in conjunction with the ceramic filter element above to achieve integrated cooling and filtration. It can also be filtered separately without cooling.

[0015] (3) By fixing the insulation plate longitudinally on the left side between the upper and lower sliders, open the furnace door at the slot on the left side of the furnace body, place the material to be sintered on the base, and then close the furnace door. The vacuum pump adjusts the gas pressure inside the furnace body and starts the electric heater for firing. Push the insulation plate with sliders horizontally along the tracks at the upper and lower sides to block and seal the gap between the slot and the furnace door, so as to prevent the temperature of the furnace body from falling too quickly. Attached Figure Description

[0016] Figure 1 This is a frontal cross-sectional view of the present invention.

[0017] Figure 2 This is a frontal sectional view of the lower chamber structure of this utility model;

[0018] Figure 3 This is a front view cross-sectional structural diagram of the slotted structure of this utility model;

[0019] Figure 4 For the present utility model Figure 1 Enlarged cross-sectional view of point A in the middle.

[0020] In the diagram: 1. Furnace body; 2. Base; 3. Electric heater; 4. Gas tank; 5. Liquid pump; 6. Cooling chamber; 7. Filter chamber; 8. Vacuum pump; 9. Connecting pipe; 10. Ceramic filter element; 11. Support frame; 12. Through slot; 13. T-pipe one; 14. Valve; 15. Furnace door; 16. Insulation board; 17. Firing chamber; 18. Spiral tube; 19. Fan; 20. Short pipe; 21. Limiting rod; 22. T-pipe two; 23. Track; 24. Slider; 25. Slot. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4One embodiment of this utility model provides a high-temperature vacuum sintering device for PTFE-lined materials, comprising a furnace body 1, a firing chamber 17 disposed at the lower part of the furnace body 1, and electric heaters 3 respectively installed at the front and rear of the firing chamber 17. A base 2 is fixed to the bottom of the firing chamber 17, a cooling chamber 6 is disposed above the firing chamber 17, and a filter chamber 7 is disposed above the cooling chamber 6. Support frames 11 are fixed to both sides of the bottom end of the filter chamber 7, and a ceramic filter element 10 is horizontally installed at the center between the two support frames 11. Limiting rods 21 are fixed horizontally between the upper and lower, front and back of the two side support frames 11. A vacuum pump 8 is installed at the top of the furnace body 1. A connecting pipe 9 is fixed between the left side of the vacuum pump 8 and the firing chamber 17. Through grooves 12 are provided on both sides between the firing chamber 17 and the cooling chamber 6. A three-way pipe 13 is fixed at the bottom between the two through grooves 12. A short pipe 20 is fixed at the center of the bottom of the three-way pipe 13. Air grooves 4 are provided on both sides of the bottom of the cooling chamber 6. A three-way pipe 22 is fixed at the top between the two air grooves 4.

[0023] The short pipe 20 is connected between the three-way pipe 13 and the three-way pipe 22. The two sides of the top end of the three-way pipe 13 pass through the support frame 11 and are connected to the ceramic filter element 10.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, the fluoride gas generated during sintering inside the furnace body 1 will enter the three-way pipe 22 from the gas slot after the vacuum pump 8 is turned on, and then enter the ceramic filter element 10 through the short pipe 20 and the three-way pipe 13. This material can withstand a high temperature of 900°C and can directly filter particulate impurities in the flue gas. Under the restriction of the two side support frames 11 and the transverse limiting rod 21, the filter element can be prevented from shaking.

[0025] Fans 19 are installed on both sides behind the cooling chamber 6. A spiral tube 18 is wound around the left and right sides of the outside of the three-way pipe 22. A liquid pump 5 is installed at the center of the upper right corner of the outside of the furnace body 1. A valve 14 is installed at the center of the upper left corner of the outside of the furnace body 1. The liquid pump 5 is fixedly connected to the right side of the spiral tube 18, and the valve 14 is fixedly connected to the left side of the spiral tube 18.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, before entering the filter chamber 7, the flue gas is first guided to the three-way pipe 22 through the gas groove 4. The outer surface of the three-way pipe 22 is wrapped with a cooling spiral tube 18. The liquid pump 5 is started to inject cooling water into the spiral tube 18 from the right side and then out through the valve 14 opened on the left side. There is a slot in front of the cooling chamber 6. After the fan 19 is started, it blows air from the back, which can pre-cool the flue gas passing through here and extend the cooling path.

[0027] A slot 25 is provided inside the left side of the furnace body 1, and a furnace door 15 is movably hinged to the rear of the slot 25. A track 23 is provided horizontally at the center and bottom of the left side of the furnace body 1, and a slider 24 is movably connected in the track 23. An insulation board 16 is fixed longitudinally on the left side between the upper and lower sliders 24. The slider 24 moves back and forth along the track 23, and the insulation board 16 is pressed against the left side of the furnace door 15 and the slot 25.

[0028] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, open the furnace door 15 at the slot 25 on the left side of the furnace body 1, place the material to be sintered on the base 2, and then close the furnace door 15. The vacuum pump 8 adjusts the air pressure inside the furnace body 1 and starts the electric heater 3 for firing. Push the insulation plate 16 with the slider 24 horizontally along the upper and lower tracks 23 to block and seal the gap between the slot 25 and the furnace door 15.

[0029] Furthermore, the electric heater 3, liquid pump 5, vacuum pump 8 and fan 19 are all electrically connected to an external PLC control module to control the opening and closing of the electric heater 3, liquid pump 5, vacuum pump 8 and fan 19 and preset relevant parameters. The electrical connection relationship and control method between them are existing technologies, so they will not be described in detail.

[0030] Working principle: When using this utility model, first open the furnace door 15 at the slot 25 on the left side of the furnace body 1, place the material to be sintered on the base 2, and then close the furnace door 15. The vacuum pump 8 adjusts the air pressure inside the furnace body 1 and starts the electric heater 3 for sintering. The insulation plate 16 with slider 24 is pushed horizontally along the upper and lower tracks 23 to block and seal the gap between the slot 25 and the furnace door 15. Before entering the filter chamber 7, the flue gas is first guided to the three-way pipe 22 through the gas groove 4. The outer surface of the three-way pipe 22 is wrapped with... The spiral tube 18 for cooling is wound around the gas. The liquid pump 5 is started to inject cooling water into the spiral tube 18 from the right side and then outlet it from the valve 14 opened on the left side. This can pre-cool the flue gas passing through this point and extend the cooling path. Afterward, the flue gas enters the ceramic filter element 10 through the short pipe 20 and the upper three-way pipe. This material can withstand a high temperature of 900°C and can directly filter particulate impurities in the flue gas. Under the restriction of the two side support frames 11 and the transverse limit rod 21, the filter element can be prevented from shaking and affecting the gas filtration accuracy, ensuring complete filtration of exhaust gas.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-temperature vacuum sintering apparatus for PTFE-lined materials, comprising a furnace body (1), characterized in that: A firing chamber (17) is provided at the bottom of the furnace body (1), and electric heaters (3) are installed at the front and back of the firing chamber (17). A base (2) is fixed at the bottom of the firing chamber (17). A cooling chamber (6) is provided above the firing chamber (17), and a filter chamber (7) is provided above the cooling chamber (6). Support frames (11) are fixed on both sides of the bottom of the filter chamber (7), and a ceramic filter element (10) is installed horizontally at the center between the two support frames (11). The upper, lower, front and back of the two support frames (11) are horizontally fixed. A limit rod (21) is fixed. A vacuum pump (8) is installed at the top of the furnace body (1). A connecting pipe (9) is fixed between the left side of the vacuum pump (8) and the firing chamber (17). A through groove (12) is provided on both sides between the firing chamber (17) and the cooling chamber (6). A three-way pipe (13) is fixed at the bottom between the two through grooves (12). A short pipe (20) is fixed at the center of the bottom of the three-way pipe (13). A gas groove (4) is provided on both sides of the bottom of the cooling chamber (6). A three-way pipe (22) is fixed at the top between the two gas grooves (4).

2. The high-temperature vacuum sintering apparatus for PTFE-lined materials according to claim 1, characterized in that: The short pipe (20) is connected between the first three-way pipe (13) and the second three-way pipe (22). The two sides of the top of the first three-way pipe (13) pass through the support frame (11) and are connected to the ceramic filter element (10).

3. The high-temperature vacuum sintering apparatus for PTFE-lined materials according to claim 1, characterized in that: Fans (19) are installed on both sides behind the cooling chamber (6). A spiral tube (18) is wound around the left and right sides of the outside of the three-way pipe (22). A liquid pump (5) is installed at the center of the upper right corner of the outside of the furnace body (1). A valve (14) is installed at the center of the upper left corner of the outside of the furnace body (1).

4. The high-temperature vacuum sintering apparatus for PTFE-lined materials according to claim 3, characterized in that: The liquid pump (5) is fixedly connected to the right side of the spiral tube (18), and the valve (14) is fixedly connected to the left side of the spiral tube (18).

5. The high-temperature vacuum sintering apparatus for PTFE-lined materials according to claim 1, characterized in that: The furnace body (1) has a slot (25) inside on the left side, and a furnace door (15) is hinged to the rear of the slot (25). The center and the bottom of the left side of the furnace body (1) are respectively provided with a track (23), and a slider (24) is movably connected in the track (23). A heat insulation plate (16) is fixed longitudinally on the left side between the upper and lower sliders (24).

6. The high-temperature vacuum sintering apparatus for PTFE-lined materials according to claim 5, characterized in that: The slider (24) moves back and forth along the track (23), and the insulation board (16) is pressed against the left side of the furnace door (15) and the slot.

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