A novel two-stage dewaxing structure

Abstract

The application discloses a novel secondary dewaxing structure, which comprises a gas passing pipeline for wax gas, wherein the gas passing pipeline is a multilayer sleeve structure, the outer wall of each layer of the sleeve is provided with a cooling pipe, the bottom of the innermost layer of the sleeve is provided with a gas inlet, an S-shaped detour gas path is formed between the innermost layer of the sleeve and the outermost layer of the sleeve, the top of the outermost layer of the sleeve is communicated with a gas outlet pipe, and the top of the outermost layer of the sleeve is provided with a filtering structure. The gas passing pipeline of the application adopts the multilayer sleeve structure, the wax gas enters from the gas inlet at the bottom of the innermost layer of the sleeve, passes through the S-shaped detour gas path and is filtered and discharged from the top of the outermost layer of the sleeve, compared with the existing single-layer filtering structure mode, the passing distance of the wax gas is greatly increased, and the dewaxing effect is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of dewaxing equipment for sintering furnace products, and particularly to a novel two-stage dewaxing structure. Background Technology

[0002] The dewaxing process is a crucial step in the sintering process of sintering furnace products, significantly impacting product quality. Despite numerous upgrades to the dewaxing equipment, incomplete dewaxing during the sintering furnace process still occurs, leading to excessive wax residue in the filters and pump chambers. This necessitates frequent cleaning of these components, affecting the lifespan of critical parts of the sintering furnace. To address this issue, a structural overhaul of the secondary dewaxing unit has been implemented. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel two-stage dewaxing structure, which can solve the problem that the existing dewaxing devices do not completely remove wax during the dewaxing process, resulting in excessive residual wax in the filter and pump chamber.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a novel two-stage dewaxing structure, comprising a gas passage pipe for wax gas passage, wherein the gas passage pipe is a multi-layer sleeve structure, each layer of the sleeve has a cooling pipe on its outer wall, the bottom of the innermost sleeve has a gas inlet, an "S"-shaped meandering gas path is formed between the innermost sleeve and the outermost sleeve, the top of the outermost sleeve is connected to a gas output pipe, and a filter structure is provided at the top of the outermost sleeve.

[0005] As a further improvement to the above technical solution:

[0006] The air duct includes three layers of sleeves, from the inside out: an inner sleeve, a middle sleeve, and an outer sleeve. A first cooling pipe, a second cooling pipe, and a third cooling pipe are respectively installed on the outer sides of the inner sleeve, the middle sleeve, and the outer sleeve. The bottom ends of the first cooling pipe and the second cooling pipe are connected to the first cooling water inlet pipe. The top of the first cooling pipe is closed. The top sidewall of the first cooling pipe is connected to the second cooling pipe. The top of the second cooling pipe is connected to the first cooling water outlet pipe. The bottom of the third cooling pipe is connected to the second cooling water inlet pipe, and the top of the third cooling pipe is connected to the second cooling water outlet pipe.

[0007] The intermediate sleeve and outer sleeve are equipped with spiral heat dissipation fins, and the spaces between the spiral heat dissipation fins are filled with filter material.

[0008] The inner sleeve, intermediate sleeve, outer sleeve, first cooling pipe, second cooling pipe, and third cooling pipe are all stainless steel pipes.

[0009] The intermediate sleeve, outer sleeve, second cooling pipe, and third cooling pipe are connected to a connecting seat at their bottom ends. The connecting seat has a through hole that connects the bottom of the intermediate sleeve and the outer sleeve. The bottom ends of the inner sleeve and the first cooling pipe pass through the connecting seat and are connected to the base flange. The base flange has a through hole that connects the gas inlet to the outside. The top of the first cooling pipe and the outer wall of the inner sleeve are sealed by a first stainless steel sealing plate. The top of the intermediate sleeve is connected to a blind flange. The top of the third cooling pipe and the side wall of the outer sleeve are sealed by a second stainless steel sealing plate. The top of the outer sleeve is connected to a connecting flange.

[0010] A water pipe is installed on the outer side of the bottom of the first cooling pipe. One end of the water pipe is connected to the connecting seat, and the other end is connected to the base flange. The connecting seat, the outer wall of the first cooling pipe, the water pipe and the base flange form a water passage cavity. The connecting seat has an inlet channel that communicates with the first cooling water inlet pipe. The inlet channel communicates with the water passage cavity. The water passage cavity communicates with the bottom of the first cooling pipe and the second cooling pipe.

[0011] A wax storage tube is installed on the outside of the water pipe. The top of the wax storage tube is connected to the connecting seat, and the bottom of the wax storage tube is closed. The connecting seat, the wax storage tube, and the outer wall of the water pipe form a wax storage cavity. The bottom of the intermediate sleeve is connected to the outer sleeve, and the bottom of the outer sleeve is connected to the wax storage cavity. A wax outlet is provided at the bottom of the wax storage cavity.

[0012] The filter structure includes a filter ring installed on the top of the outer tube. The outer wall of the filter ring is in close contact with the inner wall of the outer tube. The inner cavity of the filter ring is filled with filter material. The gas output pipe is located on the side wall of the outer tube. One end of the gas output pipe is connected to the outside, and the other end is connected to the inner cavity of the filter ring. The top of the outer tube is connected to the inner cavity of the filter ring.

[0013] The number of the first cooling water outlet pipes is four. The top of the four first cooling water outlet pipes is connected to the outside. The bottom of the first cooling water outlet pipes passes through the connecting flange and the inner cavity of the filter ring and is connected to the second cooling pipe. An O-ring is provided between the first cooling water outlet pipe and the connecting flange. A PTFE gasket is provided at the bottom of the first cooling water outlet pipe.

[0014] A hydrogen delivery pipe is installed on the side of the connecting flange away from the outer sleeve, and the hydrogen delivery pipe is connected to the outer sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The gas passage of the present invention adopts a multi-layer sleeve structure. The wax gas enters from the gas inlet at the bottom of the innermost sleeve and is filtered and discharged from the top of the outermost sleeve through an “S”-shaped detour gas path. Compared with the existing single-layer filtration structure, the wax gas passage distance is greatly increased, which greatly improves the dewaxing effect.

[0017] 2. The present invention has spiral heat dissipation fins inside the middle sleeve and outer sleeve. The wax gas adopts the spiral rising + filter material and spiral falling + filter material method. Compared with the existing straight pipe + filter material structure, the wax gas passage distance is increased by a factor of two and the wax gas passage speed is slowed down. The longer the wax gas stays in the filter device, the better the wax filtration effect.

[0018] 3. The two-stage dewaxing device of the present invention has an added wax storage cavity at the bottom, which greatly increases the wax storage capacity of the dewaxing device. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the overall structure of the first embodiment of the present invention;

[0020] Figure 2 for Figure 1 Sectional view along the BB direction;

[0021] Figure 3 This is a cross-sectional view of the overall structure of the second embodiment of the present invention;

[0022] Figure 4 for Figure 3 Sectional view along the BB direction;

[0023] Figure 5 This is a schematic diagram of the internal wax gas flow path of the dewaxing device of the present invention;

[0024] Figure 6 This is a schematic diagram of the internal cooling water flow path of the dewaxing device of the present invention;

[0025] In the diagram: 1. Gas outlet pipe; 101. Inner sleeve; 102. Intermediate sleeve; 103. Outer sleeve; 2. Cooling pipe; 201. First cooling pipe; 202. Second cooling pipe; 203. Third cooling pipe; 3. Gas inlet; 4. Gas outlet pipe; 5. Filter structure; 51. Filter ring; 6. First cooling water inlet pipe; 7. First cooling water outlet pipe; 8. Second cooling water inlet pipe; 9. Second cooling water outlet pipe; 10. Spiral heat sink; 11. Connecting seat; 12. Base flange; 13. First stainless steel sealing plate; 14. Blind flange; 15. Second stainless steel sealing plate; 16. Connecting flange; 17. Water pipe; 18. Water inlet channel; 19. Wax storage pipe; 20. Wax outlet; 21. O-ring seal; 22. PTFE gasket; 23. Hydrogen delivery pipe. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Embodiment 1 of the present invention:

[0032] This invention provides the following technical solution: Figure 1 and Figure 2 As shown, the novel two-stage dewaxing structure of this embodiment includes a gas passage pipe 1 for wax gas passage. The gas passage pipe 1 is a multi-layer sleeve structure. Each layer of sleeve has a cooling pipe 2 on its outer wall. The bottom of the innermost sleeve has a gas inlet 3. An "S"-shaped meandering gas path is formed between the innermost sleeve and the outermost sleeve. The top of the outermost sleeve is connected to the gas output pipe 4. A filter structure 5 is provided at the top of the outermost sleeve.

[0033] Traditional two-stage dewaxing devices use a single-layer filter pipe. Wax gas flows vertically upwards through a small pipe, a cyclone separator, and the filter pipe. The wax gas liquefies upon cooling in the filter pipe and remains there, while hydrogen rises and enters the ignition device for combustion. This structure, due to the limited length of the tank, results in a very short distance and time for the wax gas to pass through, leading to incomplete filtration. This invention addresses this by designing the gas outlet pipe 1 as a multi-layered sleeve structure. An "S"-shaped meandering gas path is formed between the innermost and outermost sleeves. Wax gas enters from the gas inlet 3 at the bottom of the innermost sleeve, travels through the "S"-shaped meandering gas path, passes through the filter structure 5, and finally flows out from the gas outlet pipe 4. The "S"-shaped meandering gas path increases the cooling and condensation stroke of the wax gas, thereby improving the recovery efficiency of the forming agent in the dewaxing gas. The recovery efficiency of the forming agent in the dewaxing gas is significantly improved, more than doubling.

[0034] This invention can effectively solve the problems of excess residual wax in filters and pump chambers and insufficient wax capacity in dewaxing devices, thereby improving product quality and extending the lifespan of components in critical locations.

[0035] Furthermore, the air duct 1 includes three layers of sleeves, from the inside out: an inner sleeve 101, a middle sleeve 102, and an outer sleeve 103. The inner sleeve 101, the middle sleeve 102, and the outer sleeve 103 are respectively provided with a first cooling pipe 201, a second cooling pipe 202, and a third cooling pipe 203. The bottom ends of the first cooling pipe 201 and the second cooling pipe 202 are connected to the first cooling water inlet pipe 6. The top of the first cooling pipe 201 is closed, and the top side wall of the first cooling pipe 201 is connected to the second cooling pipe 202. The top of the second cooling pipe 202 is connected to the first cooling water outlet pipe 7. The bottom of the third cooling pipe 203 is connected to the second cooling water inlet pipe 8, and the top of the third cooling pipe 203 is connected to the second cooling water outlet pipe 9.

[0036] Specifically, the bottoms of the first cooling pipe 201 and the second cooling pipe 202 are both connected to the first cooling water inlet pipe 6. Cooling water enters from the first cooling water inlet pipe 6, splits into two branches, enters the first cooling pipe 201 and the second cooling pipe 202, and finally merges at the top of the first cooling pipe 201 and the second cooling pipe 202 and flows out from the first cooling water outlet pipe 7 to form the first external cooling water circulation. The cooling water in the third cooling pipe 203 enters from the second cooling water inlet pipe 8 and flows out from the second cooling water outlet pipe 9 to form the second external cooling water circulation. The water temperature in the third cooling pipe 203 is lower than the water temperature in the first cooling pipe 201 and the second cooling pipe 202, which further improves the cooling and condensation effect.

[0037] like Figure 1 As shown, the gas outlet pipe 1 consists of three sleeves of different diameters and lengths, which are arranged concentrically. From the inside to the outside, the three sleeves are an inner sleeve 101, a middle sleeve 102, and an outer sleeve 103. The wax gas enters from the bottom of the inner sleeve 101, enters the middle sleeve 102 from the top of the inner sleeve 101, and then enters the outer sleeve 103 from the bottom of the middle sleeve 102. After being filtered by the filter structure 5, it finally flows out from the gas outlet pipe 4. An "S"-shaped detour gas path is used to increase the cooling and condensation stroke of the wax gas to improve the recovery efficiency of the forming agent in the dewaxing gas.

[0038] Furthermore, the inner sleeve 101, the intermediate sleeve 102, the outer sleeve 103, the first cooling pipe 201, the second cooling pipe 202, and the third cooling pipe 203 are all stainless steel pipes.

[0039] Furthermore, the intermediate sleeve 102, outer sleeve 103, second cooling pipe 202, and third cooling pipe 203 are connected to a connecting seat 11 at their bottom ends. The connecting seat 11 has a through hole that connects the bottom of the intermediate sleeve 102 and the outer sleeve 103. The bottom ends of the inner sleeve 101 and the first cooling pipe 201 pass through the connecting seat 11 and are connected to the base flange 12. The base flange 12 has a through hole that connects the gas inlet 3 to the outside. The base flange 12 seals the bottom of the first cooling pipe 201, and the top of the first cooling pipe 201 is connected to the inner sleeve. The first cooling pipe 201 is flush with the outer wall of the inner sleeve 101 and is sealed by the first stainless steel sealing plate 13. The top of the intermediate sleeve 102 is slightly higher than the top of the inner sleeve 101. The top of the intermediate sleeve 102 is connected to a blind flange 14, which seals the top of the intermediate sleeve 102. The top of the third cooling pipe 203 is sealed to the side wall of the outer sleeve 103 by the second stainless steel sealing plate 15. The top of the outer sleeve 103 is connected to a connecting flange 16, which seals the top of the outer sleeve 103.

[0040] Furthermore, a water pipe 17 is installed on the outer side of the bottom of the first cooling pipe 201. One end of the water pipe 17 is connected to the connecting seat 11, and the other end is connected to the base flange 12. The connecting seat 11, the outer wall of the first cooling pipe 201, the water pipe 17 and the base flange 12 form a water passage cavity. A water inlet channel 18 is opened on the connecting seat 11, which is connected to the first cooling water inlet pipe 6. The water inlet channel 18 is connected to the water passage cavity, and the water passage cavity is connected to the bottom of the first cooling pipe 201 and the second cooling pipe 202.

[0041] Furthermore, a wax storage tube 19 is installed on the outside of the water pipe 17. The top of the wax storage tube 19 is connected to the connecting seat 11, and the bottom of the wax storage tube 19 is closed. The connecting seat 11, the wax storage tube 19, and the outer wall of the water pipe 17 form a wax storage cavity. The bottom of the intermediate sleeve 102 is connected to the outer sleeve 103, and the bottom of the outer sleeve 103 is connected to the wax storage cavity. A wax outlet 20 is provided at the bottom of the wax storage cavity.

[0042] In the prior art, there is no wax storage space, and wax blockage is prone to occur at the cyclone component. The two-stage dewaxing device of the present invention adds a wax storage cavity at the bottom, which increases the wax storage capacity of the dewaxing device.

[0043] Furthermore, the filter structure 5 includes a filter ring 51 installed on the top of the outer tube 103. The outer wall of the filter ring 51 is in close contact with the inner wall of the outer tube 103. The inner cavity of the filter ring 51 is filled with filter material. The gas output pipe 4 is located on the side wall of the outer tube 103. One end of the gas output pipe 4 is connected to the outside, and the other end is connected to the inner cavity of the filter ring 51. The top of the outer tube 103 is connected to the inner cavity of the filter ring 51.

[0044] Furthermore, there are four first cooling water outlet pipes 7, which are symmetrically distributed. The top ends of the four first cooling water outlet pipes 7 are connected to the outside, and the bottom ends of the first cooling water outlet pipes 7 pass through the connecting flange 16 and the inner cavity of the filter ring 51 to connect with the second cooling pipe 202. An O-ring 21 is provided between the first cooling water outlet pipe 7 and the connecting flange 16, and a PTFE gasket 22 is provided at the bottom end of the first cooling water outlet pipe 7.

[0045] Furthermore, a hydrogen delivery pipe 23 is installed on the side of the connecting flange 16 away from the outer sleeve 103, and the hydrogen delivery pipe 23 is connected to the outer sleeve 103.

[0046] Embodiment 2 of the present invention:

[0047] like Figures 3 to 6 As shown, the novel two-stage dewaxing structure of this embodiment includes a gas passage pipe 1 for wax gas passage. The gas passage pipe 1 is a multi-layer sleeve structure. Each layer of sleeve has a cooling pipe 2 on its outer wall. The bottom of the innermost sleeve has a gas inlet 3. An "S"-shaped meandering gas path is formed between the innermost sleeve and the outermost sleeve. The top of the outermost sleeve is connected to the gas output pipe 4. A filter structure 5 is provided at the top of the outermost sleeve.

[0048] Traditional two-stage dewaxing devices use a single-layer filter pipe. Wax gas flows vertically upwards through a small pipe, a cyclone separator, and the filter pipe. The wax gas liquefies upon cooling in the filter pipe and remains there, while hydrogen rises and enters the ignition device for combustion. This structure, due to the limited length of the tank, results in a very short distance and time for the wax gas to pass through, leading to incomplete filtration. This invention addresses this by designing the gas outlet pipe 1 as a multi-layered sleeve structure. An "S"-shaped meandering gas path is formed between the innermost and outermost sleeves. Wax gas enters from the gas inlet 3 at the bottom of the innermost sleeve, travels through the "S"-shaped meandering gas path, passes through the filter structure 5, and finally flows out from the gas outlet pipe 4. The "S"-shaped meandering gas path increases the cooling and condensation stroke of the wax gas, thereby improving the recovery efficiency of the forming agent in the dewaxing gas. The recovery efficiency of the forming agent in the dewaxing gas is significantly improved, more than doubling.

[0049] This invention can effectively solve the problems of excess residual wax in filters and pump chambers and insufficient wax capacity in dewaxing devices, thereby improving product quality and extending the lifespan of components in critical locations.

[0050] Furthermore, the air duct 1 includes three layers of sleeves, from the inside out: an inner sleeve 101, a middle sleeve 102, and an outer sleeve 103. The inner sleeve 101, the middle sleeve 102, and the outer sleeve 103 are respectively provided with a first cooling pipe 201, a second cooling pipe 202, and a third cooling pipe 203. The bottom ends of the first cooling pipe 201 and the second cooling pipe 202 are connected to the first cooling water inlet pipe 6. The top of the first cooling pipe 201 is closed, and the top side wall of the first cooling pipe 201 is connected to the second cooling pipe 202. The top of the second cooling pipe 202 is connected to the first cooling water outlet pipe 7. The bottom of the third cooling pipe 203 is connected to the second cooling water inlet pipe 8, and the top of the third cooling pipe 203 is connected to the second cooling water outlet pipe 9.

[0051] Specifically, the bottoms of the first cooling pipe 201 and the second cooling pipe 202 are both connected to the first cooling water inlet pipe 6. Cooling water enters from the first cooling water inlet pipe 6, splits into two branches, enters the first cooling pipe 201 and the second cooling pipe 202, and finally merges at the top of the first cooling pipe 201 and the second cooling pipe 202 and flows out from the first cooling water outlet pipe 7 to form the first external cooling water circulation. The cooling water in the third cooling pipe 203 enters from the second cooling water inlet pipe 8 and flows out from the second cooling water outlet pipe 9 to form the second external cooling water circulation. The water temperature in the third cooling pipe 203 is lower than the water temperature in the first cooling pipe 201 and the second cooling pipe 202, which further improves the cooling and condensation effect.

[0052] like Figure 3As shown, the gas outlet pipe 1 consists of three sleeves of different diameters and lengths, which are arranged concentrically. From the inside to the outside, the three sleeves are an inner sleeve 101, a middle sleeve 102, and an outer sleeve 103. The wax gas enters from the bottom of the inner sleeve 101, enters the middle sleeve 102 from the top of the inner sleeve 101, and then enters the outer sleeve 103 from the bottom of the middle sleeve 102. After being filtered by the filter structure 5, it finally flows out from the gas outlet pipe 4. An "S"-shaped detour gas path is used to increase the cooling and condensation stroke of the wax gas to improve the recovery efficiency of the forming agent in the dewaxing gas.

[0053] Furthermore, the intermediate sleeve 102 and the outer sleeve 103 are provided with spiral heat sinks 10, and the space between the spiral heat sinks 10 is filled with filter material.

[0054] Specifically, such as Figure 5 As shown, when the wax gas passes through the intermediate sleeve 102 and the outer sleeve 103, it forms a downward swirling gas path and an upward swirling gas path, respectively. By using the spiral rising + filter material and the spiral falling + filter material, the distance that the wax gas passes through is increased many times over, and the speed of the wax gas passing through is slowed down. The longer the wax gas stays in the filter device, the better the wax filtration effect. The spiral shape can also ensure the flow of dewaxing gas and condensate in the intermediate sleeve 102 and the outer sleeve 103.

[0055] Furthermore, the inner sleeve 101, the intermediate sleeve 102, the outer sleeve 103, the first cooling pipe 201, the second cooling pipe 202, and the third cooling pipe 203 are all stainless steel pipes.

[0056] Furthermore, the intermediate sleeve 102, outer sleeve 103, second cooling pipe 202, and third cooling pipe 203 are connected to a connecting seat 11 at their bottom ends. The connecting seat 11 has a through hole that connects the bottom of the intermediate sleeve 102 and the outer sleeve 103. The bottom ends of the inner sleeve 101 and the first cooling pipe 201 pass through the connecting seat 11 and are connected to the base flange 12. The base flange 12 has a through hole that connects the gas inlet 3 to the outside. The base flange 12 seals the bottom of the first cooling pipe 201, and the top of the first cooling pipe 201 is connected to the inner sleeve. The first cooling pipe 201 is flush with the outer wall of the inner sleeve 101 and is sealed by the first stainless steel sealing plate 13. The top of the intermediate sleeve 102 is slightly higher than the top of the inner sleeve 101. The top of the intermediate sleeve 102 is connected to a blind flange 14, which seals the top of the intermediate sleeve 102. The top of the third cooling pipe 203 is sealed to the side wall of the outer sleeve 103 by the second stainless steel sealing plate 15. The top of the outer sleeve 103 is connected to a connecting flange 16, which seals the top of the outer sleeve 103.

[0057] Furthermore, a water pipe 17 is installed on the outer side of the bottom of the first cooling pipe 201. One end of the water pipe 17 is connected to the connecting seat 11, and the other end is connected to the base flange 12. The connecting seat 11, the outer wall of the first cooling pipe 201, the water pipe 17 and the base flange 12 form a water passage cavity. A water inlet channel 18 is opened on the connecting seat 11, which is connected to the first cooling water inlet pipe 6. The water inlet channel 18 is connected to the water passage cavity, and the water passage cavity is connected to the bottom of the first cooling pipe 201 and the second cooling pipe 202.

[0058] Furthermore, a wax storage tube 19 is installed on the outside of the water pipe 17. The top of the wax storage tube 19 is connected to the connecting seat 11, and the bottom of the wax storage tube 19 is closed. The connecting seat 11, the wax storage tube 19, and the outer wall of the water pipe 17 form a wax storage cavity. The bottom of the intermediate sleeve 102 is connected to the outer sleeve 103, and the bottom of the outer sleeve 103 is connected to the wax storage cavity. A wax outlet 20 is provided at the bottom of the wax storage cavity.

[0059] In the prior art, there is no wax storage space, and wax blockage is prone to occur at the cyclone component. The two-stage dewaxing device of the present invention adds a wax storage cavity at the bottom, which increases the wax storage capacity of the dewaxing device.

[0060] Furthermore, the filter structure 5 includes a filter ring 51 installed on the top of the outer tube 103. The outer wall of the filter ring 51 is in close contact with the inner wall of the outer tube 103. The inner cavity of the filter ring 51 is filled with filter material. The gas output pipe 4 is located on the side wall of the outer tube 103. One end of the gas output pipe 4 is connected to the outside, and the other end is connected to the inner cavity of the filter ring 51. The top of the outer tube 103 is connected to the inner cavity of the filter ring 51.

[0061] Furthermore, there are four first cooling water outlet pipes 7, which are symmetrically distributed. The top ends of the four first cooling water outlet pipes 7 are connected to the outside, and the bottom ends of the first cooling water outlet pipes 7 pass through the connecting flange 16 and the inner cavity of the filter ring 51 to connect with the second cooling pipe 202. An O-ring 21 is provided between the first cooling water outlet pipe 7 and the connecting flange 16, and a PTFE gasket 22 is provided at the bottom end of the first cooling water outlet pipe 7.

[0062] Furthermore, a hydrogen delivery pipe 23 is installed on the side of the connecting flange 16 away from the outer sleeve 103, and the hydrogen delivery pipe 23 is connected to the outer sleeve 103.

[0063] Specific working principle: In the dewaxing process, the gas inlet 3 of the inner sleeve 101 of the secondary dewaxing device is connected to the external primary dewaxing device. The gas (wax gas) enters from the gas inlet 3 of the inner sleeve 101, passes through the inner sleeve 101, flows from the top of the inner sleeve 101 to the lower swirling gas path in the middle sleeve 102, enters the upper swirling gas path in the outer sleeve 103, and after being filtered by the filter material in the filter ring 51, the gas is output from the gas output pipe 4. During the flow of the gas (wax gas), cooling water enters from the first cooling water inlet pipe 6 and the second cooling water inlet pipe 8 respectively. The cooling water entering from the first cooling water inlet pipe 6 passes through... The water inlet channel 18 enters the water pipe 17, and the cooling water in the water pipe 17 enters the first cooling pipe 201 and the second cooling pipe 202 respectively. The cooling water entering the second cooling water inlet pipe 8 directly enters the third cooling pipe 203. The cooling water in the first cooling pipe 201, the second cooling pipe 202 and the third cooling pipe 203 cools the gas (wax gas). The wax gas is cooled and liquefied into liquid in the secondary dewaxing device. Under the action of gravity, the liquid in the inner sleeve 101 flows to the primary dewaxing device, the liquid in the middle sleeve 102 flows to the bottom of the outer sleeve 103, and the liquid in the outer sleeve 103 flows to the wax storage cavity, where it is finally collected.

[0064] When performing hydrogen micro-positive pressure dewaxing, the medium gas transported is hydrogen, which carries the wax gas out of the sintering furnace. The hydrogen rises and enters the ignition device through the hydrogen delivery pipe 23 for combustion. At this time, the gas output pipe 4 is closed by the butterfly valve. When performing negative pressure dewaxing, the medium gas transported is an inert gas such as nitrogen or argon, which carries the wax gas out of the sintering furnace. At this time, the hydrogen delivery pipe 23 is closed by the butterfly valve, the wax gas is collected in the dewaxing device, and the remaining gas is extracted to the outside through the gas output pipe 4 by the vacuum pump.

[0065] During the dewaxing process, the cooling water in the first cooling pipe 201, the second cooling pipe 202, and the third cooling pipe 203 is replaced with high-temperature hot water, so that the wax remaining in the secondary dewaxing device does not solidify in the secondary dewaxing device and continues to flow into the wax storage cavity.

[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel two-stage dewaxing structure, characterized in that, It includes a gas passage pipe for passing wax gas, the gas passage pipe is a multi-layer sleeve structure, each layer of the sleeve is provided with a cooling pipe on its outer wall, the bottom of the innermost sleeve is provided with a gas inlet, an "S"-shaped meandering gas path is formed between the innermost sleeve and the outermost sleeve, the top of the outermost sleeve is connected to a gas output pipe, and a filter structure is provided at the top of the outermost sleeve. The air duct includes three layers of sleeves, from the inside out: an inner sleeve, a middle sleeve, and an outer sleeve. A first cooling pipe, a second cooling pipe, and a third cooling pipe are respectively installed on the outer sides of the inner sleeve, the middle sleeve, and the outer sleeve. The bottom ends of the first cooling pipe and the second cooling pipe are connected to the first cooling water inlet pipe. The top of the first cooling pipe is closed. The top sidewall of the first cooling pipe is connected to the second cooling pipe. The top of the second cooling pipe is connected to the first cooling water outlet pipe. The bottom of the third cooling pipe is connected to the second cooling water inlet pipe. The top of the third cooling pipe is connected to the second cooling water outlet pipe. The intermediate sleeve, outer sleeve, second cooling pipe, and third cooling pipe are connected to a connecting seat at their bottom ends. The connecting seat has a through hole that connects the bottom of the intermediate sleeve and the outer sleeve. The bottom ends of the inner sleeve and the first cooling pipe pass through the connecting seat and are connected to the base flange. The base flange has a through hole that connects the gas inlet to the outside. The top of the first cooling pipe and the outer wall of the inner sleeve are sealed by a first stainless steel sealing plate. The top of the intermediate sleeve is connected to a blind flange. The top of the third cooling pipe and the side wall of the outer sleeve are sealed by a second stainless steel sealing plate. The top of the outer sleeve is connected to a connecting flange. A water pipe is installed on the outer side of the bottom of the first cooling pipe. One end of the water pipe is connected to the connecting seat, and the other end is connected to the base flange. The connecting seat, the outer wall of the first cooling pipe, the water pipe and the base flange form a water passage cavity. The connecting seat has an inlet channel that communicates with the first cooling water inlet pipe. The inlet channel communicates with the water passage cavity. The water passage cavity communicates with the bottom of the first cooling pipe and the second cooling pipe. A wax storage tube is installed on the outside of the water pipe. The top of the wax storage tube is connected to the connecting seat, and the bottom of the wax storage tube is closed. The connecting seat, the wax storage tube, and the outer wall of the water pipe form a wax storage cavity. The bottom of the intermediate sleeve is connected to the outer sleeve. The bottom of the outer sleeve is connected to the wax storage cavity. A wax outlet is provided at the bottom of the wax storage cavity. The filter structure includes a filter ring installed on the top of the outer tube. The outer wall of the filter ring is in close contact with the inner wall of the outer tube. The inner cavity of the filter ring is filled with filter material. The gas output pipe is located on the side wall of the outer tube. One end of the gas output pipe is connected to the outside, and the other end is connected to the inner cavity of the filter ring. The top of the outer tube is connected to the inner cavity of the filter ring.

2. The novel two-stage dewaxing structure according to claim 1, characterized in that, The intermediate sleeve and outer sleeve are equipped with spiral heat dissipation fins, and the spaces between the spiral heat dissipation fins are filled with filter material.

3. The novel two-stage dewaxing structure according to claim 1, characterized in that, The inner sleeve, intermediate sleeve, outer sleeve, first cooling pipe, second cooling pipe, and third cooling pipe are all stainless steel pipes.

4. The novel two-stage dewaxing structure according to claim 1, characterized in that, The number of the first cooling water outlet pipes is four. The top of the four first cooling water outlet pipes is connected to the outside. The bottom of the first cooling water outlet pipes passes through the connecting flange and the inner cavity of the filter ring and is connected to the second cooling pipe. An O-ring is provided between the first cooling water outlet pipe and the connecting flange. A PTFE gasket is provided at the bottom of the first cooling water outlet pipe.

5. The novel two-stage dewaxing structure according to claim 1, characterized in that, A hydrogen delivery pipe is installed on the side of the connecting flange away from the outer sleeve, and the hydrogen delivery pipe is connected to the outer sleeve.

Images