Long life leakproof powder discharge valve

Abstract

The utility model discloses a long -life leakproof powder unloading valve, including valve body and valve core axle, the upper end of valve body is equipped with the feed port, and the lower end is equipped with the discharge port, the valve core axle traverses the valve body and is supported by bearing in both ends, be equipped with a plurality of circumferential distribution's vane on the valve core axle in the valve body, the left labyrinth female head and right labyrinth female head of fixed connection with the both sides sealing of blade respectively are set up on the valve core axle, the outside of left labyrinth female head and right labyrinth female head is the labyrinth side with concave -convex structure, respectively butt -joint sleeve set in the left labyrinth male head and right labyrinth male head on the valve core axle, and the butt -joint place is sealed with first graphite packing, the long -life leakproof powder unloading valve can solve the problem that powder will leak in a short time.

Description

Technical Field

[0001] This utility model relates to the production field of tabular corundum, specifically to a long-life, leak-proof powder unloading valve. Background Technology

[0002] Tabular alumina, as a high-quality refractory raw material, is increasingly used in various fields, with its consumption increasing year by year. The production process of tabular alumina involves using high-purity industrial alumina raw material, which is finely ground in a large ball mill to a 325-mesh fine powder, requiring a -0.045mm fraction >95%, before proceeding to the pelletizing process. No additives are added, only water is added as a binder. Green pellets with a diameter of approximately 23mm are formed in a horizontal pelletizing tank, then dried. The dried green pellets are then fired at 1900℃ in a vertical kiln. The fired pellets are then crushed and screened to obtain the desired finished product.

[0003] The fine powder, after being ground in a large ball mill, will be transported to the pelletizing silo via an elevator or pneumatic conveyor.

[0004] The hoist is inefficient and often experiences issues such as bucket detachment or chain derailment, which can lead to production interruptions and severely impact product quality.

[0005] Currently, there are two commonly used pneumatic conveying methods:

[0006] One method is negative pressure pneumatic conveying, but negative pressure pneumatic conveying requires a relatively large suction force, which often leads to damage to the dust collector bags and higher costs.

[0007] The second method is positive pressure conveying, which is more suitable for dust collector bags and has a relatively lower cost. However, one problem is powder leakage from the discharge valve, specifically at the bearing position of the discharge valve.

[0008] Currently, the bearing position of the unloading valve is usually sealed with a polytetrafluoroethylene rubber gasket. However, alumina powder has a high Mohs hardness of about 9. During use, the bearing seal position will suffer severe wear. In addition, the internal pressure will cause powder leakage.

[0009] The current practice is to place graphite packing in the bearing and bearing housing to enhance the sealing effect, but powder leakage still occurs after a short period of use, and the discharge valve needs to be replaced after about one month. Utility Model Content

[0010] In view of the above-mentioned technical problems and the shortcomings of the field, this utility model provides a long-life anti-leakage powder unloading valve, which solves the problem of powder leakage occurring in a short period of time.

[0011] The specific technical solution is as follows:

[0012] A long-life, leak-proof powder discharge valve includes a valve body and a valve core shaft. The valve body has an inlet at the upper end and an outlet at the lower end. The valve core shaft runs through the valve body and is supported by bearings at both ends. The valve core shaft inside the valve body has multiple circumferentially distributed blades. A left labyrinth female head and a right labyrinth female head are respectively sealed and fixedly connected to both sides of the blades on the valve core shaft. The outer sides of the left labyrinth female head and the right labyrinth female head are labyrinth sides with concave and convex structures, which respectively connect to the left labyrinth male head and the right labyrinth male head fitted on the valve core shaft, and the connection is sealed with a first graphite packing.

[0013] The aforementioned long-life, leak-proof powder discharge valve uses rotating blades to carry powder from the inlet to the outlet for discharge. Adjacent blades on the valve core, along with the left and right labyrinth heads (and in some cases, the valve body wall), form independent chambers. During valve core rotation, these chambers rotate around the core, changing their relative positions. When a chamber aligns with the inlet, it becomes the feed chamber, receiving powder. As the valve core rotates, this chamber aligns with the outlet, becoming the discharge chamber, discharging the previously received powder. Then, with further rotation, it returns to align with the inlet, repeating this cycle to achieve continuous feeding and discharging. Stopping valve core rotation stops feeding and discharging.

[0014] When assembling the aforementioned long-life leak-proof powder discharge valve, the first graphite packing can be filled into the positions of the left and right labyrinth male heads, and then the left and right labyrinth male heads can be connected and pressed with the corresponding labyrinth female heads to ensure a sealing effect.

[0015] When using the above-mentioned long-life anti-leakage powder discharge valve, the discharge port can be connected to the side opening of the positive pressure pneumatic conveying pipeline. The powder enters from the inlet, and the valve core rotates to perform the feeding and discharging process as described above. The rotation of the valve core can drive the left labyrinth female head and the right labyrinth female head to rotate synchronously, while the left labyrinth male head and the right labyrinth male head can remain stationary.

[0016] The aforementioned long-life anti-leakage powder discharge valve has an extended valve core shaft, with bearings positioned at both ends of the valve core shaft. Furthermore, by setting a labyrinthine curved seal structure consisting of a left labyrinthine female head and a left labyrinthine male head, and a right labyrinthine female head and a right labyrinthine male head on the two outer sides of the blades along the valve core shaft direction, the powder escape path is extended, the tortuosity of the powder escape path is increased, and the difficulty of powder escape is enhanced. This, combined with the first graphite packing sealing the labyrinthine escape channel, ensures that the powder will not overflow.

[0017] In some preferred embodiments, the long-life anti-leakage powder discharge valve has a horizontally placed cylindrical structure in the valve body, and the valve core shaft is located on the axis of the cylindrical structure.

[0018] In some preferred embodiments, the bearing of the long-life leak-proof powder discharge valve is mounted on a bearing housing.

[0019] In some preferred embodiments, the long-life anti-leakage powder unloading valve has the bearing and the bearing housing located outside the valve body, which can prevent powder from entering the bearing and bearing housing and causing damage.

[0020] The long-life, leak-proof powder unloading valve described above has blades that are as close as possible to the inner wall of the valve body without affecting rotation. This better ensures the independence of each chamber and also acts as an airlock, preventing positive pressure gas (such as air) blown in from the discharge port from entering the feed port above the valve body and thus preventing powder from descending into the valve body. In some preferred embodiments, the gap between the blades and the inner wall of the valve body is 0.15–0.22 mm.

[0021] In some preferred embodiments, the long-life anti-leakage powder discharge valve has a blade with a length in the valve core axis direction that is consistent with the inner diameter of the valve body in the valve core axis direction.

[0022] In some preferred embodiments, the long-life anti-leakage powder discharge valve has a left labyrinth female head, a right labyrinth female head, a left labyrinth male head, and a right labyrinth male head, all of which are labyrinth discs, each with three annular protrusions and three annular recesses.

[0023] In some preferred embodiments, the long-life anti-leakage powder discharge valve has left and right mounting seats respectively sealed and fixedly connected to the outer sides of the left and right labyrinth male heads and the valve core shaft. The left and right mounting seats are sealed with the valve core shaft using a second graphite packing. This can strengthen the valve and improve the overall structural stability, and further prevent powder leakage, thus extending the service life of the discharge valve.

[0024] In some preferred embodiments, the long-life anti-leakage powder discharge valve has a groove on the side of both the left and right mounting seats near the valve core shaft, which communicates with the outer side. The second graphite packing is filled in the groove. A left end cap and a right end cap, respectively, are fixedly connected to the outer sides of the left and right mounting seats and are sleeved on the valve core shaft. A protrusion on the side of both the left and right end caps near the valve core shaft, which mates with the groove, is used to press the second graphite packing inward. This preferred structural design not only further increases the structural stability of the discharge valve but also improves the sealing effect of the second graphite packing, thereby better preventing powder leakage.

[0025] Compared with the prior art, the advantages of this utility model are as follows:

[0026] This invention provides a long-life, leak-proof powder unloading valve, which solves the problem of powder leakage occurring in a short period of time. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a long-life, leak-proof powder unloading valve in a specific embodiment of this utility model.

[0028] Figure 2 for Figure 1 The diagram shown is a left-side view of the valve core and its blades in a long-life, leak-proof powder unloading valve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0030] See Figure 1 A long-life, leak-proof powder discharge valve includes a valve body 1 and a valve spindle 2. The valve body 1 has a horizontally positioned cylindrical structure, and the valve spindle 2 passes through the valve body 1 and is located on the axis of the cylindrical structure. The valve body 1 has an inlet 16 at its upper end and an outlet 17 at its lower end. The valve spindle 2 is supported at both ends by bearings 3, which are mounted on bearing seats 4. Both the bearings 3 and the bearing seats 4 are located outside the cylindrical structure of the valve body 1. Figure 2 The valve body 1 has a valve core shaft 2 with multiple circumferentially evenly distributed blades 11. The gap between the blades 11 and the inner wall of the valve body 1 is 0.15-0.22 mm. The length of the blades 11 in the direction of the valve core shaft 2 is the same as the inner diameter of the valve body 1 in the direction of the valve core shaft 2. The valve core shaft 2 is fitted with a left labyrinth female head 6 and a right labyrinth female head 8, which are respectively sealed and fixed to both sides of the blades 11. The outer sides of the left labyrinth female head 6 and the right labyrinth female head 8 are labyrinth sides with concave and convex structures, which respectively mate with the left labyrinth male head 7 and the right labyrinth male head 9 fitted on the valve core shaft 2, and the mating point is sealed with a first graphite packing 5. The left labyrinth female head 6, the right labyrinth female head 8, the left labyrinth male head 7, and the right labyrinth male head 9 are all labyrinth discs, each with 3 annular protrusions and 3 annular concavities. The outer surfaces of the left labyrinth male connector 7 and the right labyrinth male connector 9 are respectively sealed and fixedly connected to the left mounting seat 12 and the right mounting seat 14, which are sleeved on the valve spindle 2. The left mounting seat 12, the right mounting seat 14, and the valve spindle 2 are all sealed with a second graphite packing 10. The left mounting seat 12 and the right mounting seat 14 have a groove on the side near the valve spindle 2 that connects to the outer side. The second graphite packing 10 fills the groove. The outer sides of the left mounting seat 12 and the right mounting seat 14 are respectively fixedly connected to the left end cap 13 and the right end cap 15, which are sleeved on the valve spindle 2. The left end cap 13 and the right end cap 15 have a protrusion on the side near the valve spindle 2 that mates with the groove, used to press the second graphite packing 10 inward.

[0031] The aforementioned long-life anti-leakage powder discharge valve uses a rotating blade 11 to carry the powder from the inlet 16 to the outlet 17 for discharge. Adjacent blades 11 on the valve core 2, along with the left labyrinth head 6 and right labyrinth head 8 (and in some cases, the inner wall of the valve body 1), form independent chambers 19. During the rotation of the valve core 2, these chambers rotate around it, changing their relative positions. When a chamber aligns with the inlet 16, it becomes the feed chamber, receiving the powder. As the valve core 2 rotates, the chamber aligns with the outlet 17, becoming the discharge chamber, discharging the previously received powder. Then, as the valve core 2 rotates again, it returns to align with the inlet 16, repeating this cycle to achieve continuous feeding and discharging. Stopping the rotation of the valve core 2 stops feeding and discharging.

[0032] When assembling the above-mentioned long-life leak-proof powder discharge valve, the first graphite packing 5 can be filled into the positions of the left labyrinth male head 7 and the right labyrinth male head 9, and then the left labyrinth male head 7 and the right labyrinth male head 9 can be connected and pressed with the corresponding labyrinth female head to ensure the sealing effect.

[0033] When the above-mentioned long-life anti-leakage powder unloading valve is in use, the discharge port 17 can be connected to the side opening of the positive pressure pneumatic conveying pipeline 18. The powder enters from the inlet 16, the valve core shaft 2 rotates, and the feeding and discharging process described above is executed. The rotation of the valve core shaft 2 can drive the left labyrinth female head 6 and the right labyrinth female head 8 to rotate synchronously, while the left labyrinth male head 7 and the right labyrinth male head 9 can remain stationary.

[0034] The aforementioned long-life anti-leakage powder unloading valve has an extended valve core shaft 2. The bearings 3 are located at both ends of the valve core shaft 2 and outside the cylindrical structure of the valve body 1. By setting a labyrinthine curved seal structure consisting of a left labyrinthine female head 6 and a left labyrinthine male head 7 and a right labyrinthine female head 8 and a right labyrinthine male head 9 on the two outer sides of the blade 11 along the direction of the valve core shaft 2, the powder escape path is extended, the tortuosity of the powder escape path is increased, and the difficulty of powder escape is increased. This further works with the first graphite packing 5 to seal the labyrinthine escape channel. At the same time, the left and right mounting seats are designed to be pressurized and filled with the corresponding left and right end caps to form a second layer of anti-leakage powder protection, ensuring that the powder will not overflow.

[0035] Furthermore, it should be understood that after reading the above description of this utility model, those skilled in the art can make various alterations or modifications to this utility model, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A long-life, leak-proof powder unloading valve, characterized in that, It includes a valve body and a valve core shaft; the valve body has a feed port at the upper end and a discharge port at the lower end; the valve core shaft runs through the valve body and is supported by bearings at both ends; the valve core shaft inside the valve body has multiple circumferentially distributed blades; the valve core shaft is fitted with a left labyrinth female head and a right labyrinth female head, which are respectively sealed and fixedly connected to both sides of the blades; the outer sides of the left labyrinth female head and the right labyrinth female head are labyrinth sides with concave and convex structures, which respectively connect to the left labyrinth male head and the right labyrinth male head fitted on the valve core shaft, and the connection is sealed with a first graphite packing.

2. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The valve body has a horizontally placed cylindrical structure, and the valve core shaft is located on the axis of the cylindrical structure.

3. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The bearing is mounted on a bearing housing.

4. The long-life, leak-proof powder unloading valve according to claim 3, characterized in that, Both the bearing and the bearing housing are located outside the valve body.

5. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The gap between the blade and the inner wall of the valve body is 0.15~0.22 mm.

6. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The length of the blade in the direction of the valve core axis is the same as the inner diameter of the valve body in the direction of the valve core axis.

7. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The left maze female head, right maze female head, left maze male head, and right maze male head are all maze disks, each with 3 annular convex parts and 3 annular concave parts.

8. The long-life, leak-proof powder unloading valve according to claim 1, characterized in that, The outer surfaces of the left labyrinth male connector and the right labyrinth male connector are respectively sealed and fixedly connected to the left mounting seat and the right mounting seat sleeved on the valve spindle, and the left mounting seat, the right mounting seat and the valve spindle are sealed with a second graphite packing.

9. The long-life anti-leakage powder unloading valve according to claim 8, characterized in that, Both the left and right mounting seats have a groove on the side near the valve core shaft that connects to the outside. The second graphite packing is filled in the groove. The left and right mounting seats are respectively fixedly connected to the left end cap and the right end cap that are sleeved on the valve core shaft. Both the left and right end caps have a protrusion on the side near the valve core shaft that matches the groove, which is used to press the second graphite packing inward.

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