Supercritical drying oven pressure balancing system

Abstract

The utility model discloses supercritical drying kettle pressure balance system, including drying kettle, the upper end fixedly connected with drying kettle port of drying kettle, the upper end of drying kettle port is connected with the upper end cover through bolt, one side through pipeline connection has vacuum valve at drying kettle lower extreme, one side through pipeline connection has vacuum pump at vacuum valve, the other side through pipeline connection has vacuum regulating valve at drying kettle lower extreme, be equipped with vacuum gauge on the pipeline between drying kettle and vacuum regulating valve, one end through pipeline connection has nitrogen tank at vacuum regulating valve. The system in the utility model stops vacuum pump to save energy and reduce wear and tear when the pressure is less than half of the atmospheric pressure, the whole system has tiny air leakage, causes the gas of outside to enter the inside of system, then the pressure value on vacuum gauge will slowly rise, when the pressure exceeds half of the atmospheric pressure, start vacuum pump to pump again, and the pressure is pulled back to half of the atmospheric pressure.

Description

Technical Field

[0001] This utility model relates to the field of drying kettle technology, specifically to a pressure balancing system for a supercritical drying kettle. Background Technology

[0002] A drying autoclave is a device used to dry materials under vacuum or atmospheric pressure conditions, and is widely used in laboratories, chemical production, and other fields. Its core function is to accelerate the evaporation of moisture or other volatile components by reducing pressure or heating. It is suitable for drying heat-sensitive, easily oxidized, or toxic materials. By drawing a vacuum, it reduces the vapor pressure of moisture in the material, accelerates the drying process, and reduces the risk of material decomposition.

[0003] However, even after the air is evacuated from the existing drying vessel, air will still gradually enter the drying vessel, causing the pressure inside the drying vessel to gradually rise back to atmospheric pressure, resulting in an unbalanced air pressure inside the drying vessel. In addition, the sealing performance between the upper end cover and the drying vessel port of the drying vessel is poor, allowing outside air to enter the drying vessel through the gap between the upper end cover and the drying vessel port, thereby affecting the drying efficiency of the drying vessel. Therefore, it does not meet the current requirements. To address this, we propose a supercritical drying vessel pressure balancing system. Utility Model Content

[0004] The purpose of this invention is to provide a pressure balancing system for a supercritical drying vessel, in order to solve the problems mentioned in the background art, where after all the air has been extracted from the drying vessel, air continues to gradually enter the drying vessel, causing the pressure inside the drying vessel to gradually rise back to atmospheric pressure, resulting in insufficient pressure balance inside the drying vessel; and where the sealing performance between the upper end cover and the drying vessel port is poor, allowing outside air to enter the drying vessel through the gap between the upper end cover and the drying vessel port, thereby affecting the drying efficiency of the drying vessel.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a supercritical drying kettle pressure balancing system, comprising a drying kettle, a drying kettle port fixedly connected to the upper end of the drying kettle, an upper end cover bolted to the upper end of the drying kettle port, a vacuum valve connected to one side of the lower end of the drying kettle via a pipe, a vacuum pump connected to one side of the vacuum valve via a pipe, a vacuum regulating valve connected to the other side of the lower end of the drying kettle via a pipe, a vacuum gauge installed on the pipe between the drying kettle and the vacuum regulating valve, and a nitrogen tank connected to one end of the vacuum regulating valve via a pipe.

[0006] Preferably, a side limiting mechanism is fixedly connected to both sides of the drying vessel port, and an annular cavity is provided at the upper end of the drying vessel port and the side limiting mechanism.

[0007] Preferably, the lower end of the upper cover extends into the annular cavity, and an annular rubber strip is fitted around the perimeter of the lower end extension of the upper cover. Extrusion strips are extruded at both the front and rear ends of the outer side of the annular rubber strip.

[0008] Preferably, one of the extrusion strips has a perforation, and the other extrusion strip passes through the perforation, and the two extrusion strips are connected in an alternating manner through the perforation.

[0009] Preferably, the two ends of the side limiting mechanism are fixedly connected to a front end block, the front end block has a movable cavity inside, a threaded hole is provided through the middle of the front end of the movable cavity, a threaded post is movably connected in the threaded hole, and an insertion hole is provided on both sides of the threaded post on the end face of the front end block, and a snap-fit ​​bracket is inserted in the insertion hole.

[0010] Preferably, the rear end of the threaded column and the end face of the extrusion bar are connected by a rotary joint, the snap-fit ​​bracket is made of elastic material, and the front end of the snap-fit ​​bracket is snapped onto the side end face of the threaded column.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model opens the vacuum valve and then starts the vacuum pump to begin evacuating the inside of the drying kettle. The vacuum gauge provides real-time feedback on the pressure value inside the drying kettle. When the pressure is less than half of atmospheric pressure, the vacuum pump is stopped to save energy and reduce wear. The entire system has a slight air leakage, which causes external gas to enter the system. This causes the pressure value on the vacuum gauge to slowly rise. When the pressure exceeds half of atmospheric pressure, the vacuum pump is restarted to evacuate the air and bring the pressure back to more than half of atmospheric pressure.

[0013] 2. This utility model uses a rotating threaded column to pull the extrusion strip towards the movable cavity. As both ends of the extrusion strip are continuously pulled, it can compress the inner annular rubber strip. Under the continuous compression of the two extrusion strips, the annular rubber strip is continuously pressed against the upper end cover in the annular cavity, thereby gradually reducing the gap between the upper end cover and the drying kettle port. This design reduces the air leakage of the drying kettle in the overall system. Attached Figure Description

[0014] Figure 1 This is a front view of the overall structure of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the upper drying vessel port and the upper cover of the drying vessel in this utility model.

[0016] Figure 3 This utility model Figure 2 A 3D view at point A in the middle;

[0017] Figure 4 This is a frontal sectional view of the upper part of the present utility model.

[0018] In the diagram: 1. Drying kettle; 2. Vacuum valve; 3. Vacuum pump; 4. Vacuum gauge; 5. Vacuum regulating valve; 6. Nitrogen tank; 7. Top cover; 8. Side limiting mechanism; 9. Drying kettle port; 10. Front end block; 11. Annular rubber strip; 12. Circular cavity; 13. Extrusion strip; 14. Perforation; 15. Movable cavity; 16. Threaded post; 17. Snap-fit ​​bracket; 18. Insertion hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Please see Figures 1 to 4 An embodiment of this utility model provides a supercritical drying kettle pressure balancing system, including a drying kettle 1. The upper end of the drying kettle 1 is fixedly connected to a drying kettle port 9. The upper end of the drying kettle port 9 is connected to an upper end cover 7 by bolts. One side of the lower end of the drying kettle 1 is connected to a vacuum valve 2 through a pipe. One side of the vacuum valve 2 is connected to a vacuum pump 3 through a pipe. The other side of the lower end of the drying kettle 1 is connected to a vacuum regulating valve 5 through a pipe. A vacuum gauge 4 is provided on the pipe between the drying kettle 1 and the vacuum regulating valve 5. One end of the vacuum regulating valve 5 is connected to a nitrogen tank 6 through a pipe.

[0021] Open the top cover 7 at the top of the drying kettle 1, put the material to be dried into the drying kettle 1, first open the vacuum valve 2, then start the vacuum pump 3 to start evacuating the inside of the drying kettle 1. The vacuum gauge provides real-time feedback on the pressure value inside the drying kettle 1. When the pressure is less than half the atmospheric pressure, stop the vacuum pump 3 to save energy and reduce wear. There is a slight air leakage in the overall system, which causes external gas to enter the system. This causes the pressure value on the vacuum gauge 4 to slowly rise. When the pressure exceeds half the atmospheric pressure, start the vacuum pump 3 again to evacuate the air and pull the pressure back to more than half the atmospheric pressure.

[0022] When the vacuum pump 3 pumps air out of the drying vessel 1 too quickly, causing the pressure to be less than one-quarter of the atmospheric pressure, the vacuum regulating valve 5 is opened, allowing a small amount of nitrogen gas to be introduced into the drying vessel 1 from the nitrogen tank 6, so that the pressure rises back to half the atmospheric pressure. The above settings achieve the system's pressure balance operation in the drying vessel 1.

[0023] After drying in the drying kettle 1, the vacuum valve 2 and vacuum pump 3 are closed. The drying kettle 1 is also equipped with a separate regulating valve connected to the external air pressure. The operator can manually open the separate regulating valve to allow the external air to slowly enter the drying kettle 1, thereby restoring the pressure in the drying kettle 1 to atmospheric pressure. Only then can the upper cover 7 on the drying kettle 1 be opened to take out the dried material.

[0024] Both sides of the aforementioned drying vessel port 9 are fixedly connected to a side limiting mechanism 8. The upper end of the drying vessel port 9 and the side limiting mechanism 8 are provided with an annular cavity 12. The lower end of the upper cover 7 extends into the annular cavity 12. The circumference of the lower end extension of the upper cover 7 is fitted with an annular rubber strip 11. The front and rear ends of the outer side of the annular rubber strip 11 are both extruded with extrusion strips 13. One extrusion strip 13 is provided with a perforation 14, and the other extrusion strip 13 passes through the perforation 14. The two extrusion strips 13 are connected in an alternating manner through the perforation 14.

[0025] The side limiting mechanism 8 is fixedly connected to the two ends of the front end block 10. The front end block 10 has a movable cavity 15 inside. A threaded hole is provided through the middle of the front end of the movable cavity 15. A threaded post 16 is movably connected in the threaded hole. Insertion holes 18 are provided on both sides of the threaded post 16 on the end face of the front end block 10. A snap-fit ​​bracket 17 is inserted into the insertion hole 18.

[0026] The rear end of the threaded post 16 and the end face of the extrusion strip 13 are connected by a rotary joint. The snap-fit ​​bracket 17 is made of elastic material and the front end of the snap-fit ​​bracket 17 is snapped onto the side end face of the threaded post 16.

[0027] When the material is put into the drying kettle 1, the upper cover 7 is put back on the drying kettle port 9, and the drying kettle port 9 and the upper cover 7 are fixedly connected by bolts. At this time, the lower edge of the upper cover 7 is inserted into the annular cavity 12, and the annular rubber strip 11 is fitted on the lower edge of the upper cover 7. The annular rubber strip 11 can play a sealing role between the upper cover 7 and the drying kettle port 9.

[0028] Next, rotate the threaded column 16 so that it can pull the extrusion strip 13 to the movable cavity 15. As the two ends of the extrusion strip 13 are continuously pulled, the extrusion strip 13 can squeeze the inner annular rubber strip 11. Under the continuous squeezing of the two extrusion strips 13, the annular rubber strip 11 is continuously pressed against the upper end cover 7 in the annular cavity 12, thereby gradually reducing the gap between the upper end cover 7 and the drying kettle port 9. This setting reduces the air leakage of the drying kettle 1 in the overall system.

[0029] The front end block 10 is provided with snap-fit ​​brackets 17 on both sides. The snap-fit ​​brackets 17 can snap-fit ​​and limit the two sides of the threaded post 16, making the threaded post 16 less likely to rotate and move, and further improving the pulling force of the threaded post 16 on the extrusion strip 13. The snap-fit ​​brackets 17 are inserted into the insertion hole 18. This setting allows the snap-fit ​​brackets 17 to be disassembled or installed on the insertion hole 18, thereby realizing the replacement of the snap-fit ​​brackets 17 and maintaining the limit of the threaded post 16 by the two snap-fit ​​brackets 17.

[0030] 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 supercritical drying vessel pressure balancing system, comprising a drying vessel (1), characterized in that: The upper end of the drying kettle (1) is fixedly connected to the drying kettle port (9), and the upper end of the drying kettle port (9) is connected to the upper end cover (7) by bolts. One side of the lower end of the drying kettle (1) is connected to the vacuum valve (2) by a pipe. One side of the vacuum valve (2) is connected to the vacuum pump (3) by a pipe. The other side of the lower end of the drying kettle (1) is connected to the vacuum regulating valve (5) by a pipe. A vacuum gauge (4) is provided on the pipe between the drying kettle (1) and the vacuum regulating valve (5). One end of the vacuum regulating valve (5) is connected to the nitrogen tank (6) by a pipe.

2. The pressure balancing system for the supercritical drying vessel according to claim 1, characterized in that: Both sides of the drying vessel port (9) are fixedly connected to a side limiting mechanism (8), and the upper end of the drying vessel port (9) and the side limiting mechanism (8) is provided with an annular cavity (12).

3. The pressure balancing system for the supercritical drying vessel according to claim 2, characterized in that: The lower end of the upper cover (7) extends into the annular cavity (12). A ring-shaped rubber strip (11) is fitted around the lower end of the upper cover (7). Extrusion strips (13) are extruded at both the front and rear ends of the outer side of the ring-shaped rubber strip (11).

4. The pressure balancing system for the supercritical drying vessel according to claim 3, characterized in that: One of the extrusion strips (13) is provided with a perforation (14), and the other extrusion strip (13) passes through the perforation (14), and the two extrusion strips (13) are connected in an alternating manner through the perforation (14).

5. The pressure balancing system for the supercritical drying vessel according to claim 4, characterized in that: The two ends of the side limiting mechanism (8) are fixedly connected to the front end block (10). The front end block (10) has a movable cavity (15) inside. A threaded hole is provided through the middle of the front end of the movable cavity (15). A threaded column (16) is movably connected in the threaded hole. Both sides of the threaded column (16) are provided with insertion holes (18) on the end face of the front end block (10). A snap-fit ​​bracket (17) is inserted in the insertion hole (18).

6. The pressure balancing system for the supercritical drying vessel according to claim 5, characterized in that: The rear end of the threaded post (16) and the end face of the extrusion bar (13) are connected by a rotary joint. The snap-fit ​​bracket (17) is made of elastic material, and the front end of the snap-fit ​​bracket (17) is snapped onto the side end face of the threaded post (16).

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