Bottom shaft cover assembly for tubular separator drum and tubular separator drum

Abstract

The present invention discloses a bottom shaft cover assembly for a tubular separator drum and a tubular separator drum, comprising a bottom shaft cover, a material retaining plate, a ring valve, a liquid storage ring and O-rings of various specifications, wherein these parts constitute a plurality of chambers, including an upper chamber, a liquid storage chamber, a lower chamber and a first cavity for depositing solid sediment, an overflow channel for liquid overflow after separation is provided on the material retaining plate, and a plurality of slag discharge holes are provided on the inner wall of the bottom shaft cover near the lower end surface of the material retaining plate. Compared with a traditional tubular separator, a separator using the bottom shaft cover assembly and the drum described in the scheme of the present invention can realize automatic slag discharge without stopping the machine, thereby improving the separation efficiency of the tubular separator, and the advantage will be more obvious for materials with higher solid content; in addition, a liquid storage chamber is added, which can improve the centrifugal hydraulic pressure for pushing the ring valve to rise, and further increase the stability of the sealing of the slag discharge holes.

Description

Technical Field

[0001] The invention relates to the technical field of tubular separators, and in particular to a bottom shaft cover assembly for a tubular separator drum and a tubular separator drum. Background Art

[0002] The tubular separator is the type with the highest speed and separation factor among the industrial centrifuges on the market. It is mainly a physical centrifugal device that forms a strong centrifugal field by high-speed rotation of the drum, using centrifugal force instead of gravity to quickly separate two or three different components in the material (suspension or emulsion) due to the difference in specific gravity. The liquid flows out from the outlet on the top of the drum, and the solid settles inside the drum, thereby separating the materials.

[0003] The drum is the core component of the tubular separator. Figure 1 , which consists of a drum head, a drum tube and a bottom shaft cover assembly. It is driven by an electric motor and a speed change mechanism, and rotates at high speed along its own axis. The materials are separated inside it, and the liquid flows out from the upper overflow port, while the solids are deposited on the annular surface of the inner wall of the tube due to lack of fluidity. The drum needs to be taken out and manually cleaned after the machine is stopped. In order to clean the solid slag in the drum tube, the drum tube and the bottom shaft cover are connected by threads and can be disassembled when necessary. When discharging slag, the drum needs to be fixed on a special bracket, and the bottom shaft cover needs to be removed using special tools. The solid phase settled on the inner wall of the drum needs to be cleaned carefully and thoroughly; then the bottom shaft cover is tightened and the machine is reassembled. Since it needs to be stopped regularly for manual cleaning, the tubular separator is an intermittently operated equipment.

[0004] This intermittent operation seriously reduces the production efficiency of the tubular separator. Take the G105 machine as an example. The inner diameter of the rotor is 105mm, the speed is 16300rpm, the separation factor is 15700, the rotor volume is 6L, and the water passing capacity is 1200L / h. If the output is set to 600L / h and the solid content (volume percentage) of the material is 1%, then 6L of solids will be produced every hour of production. At this time, the machine must be stopped for slag discharge. Moreover, due to the accumulation of solids in the cylinder, the inner diameter of the separation cylinder is reduced. Although the speed has not decreased, the separation factor (separation factor is proportional to the rotor diameter and rotor speed) has been reduced, affecting the separation quality. Therefore, in actual production, when the sediment in the cylinder often reaches 4-5L, the machine must be stopped for slag discharge.

[0005] The tubular separator has a flexible rotor, and its drive shaft is thin, so it cannot add a brake device. In addition, the speed is high and the inertia is large. The free downtime is more than 6 minutes. In addition to the assembly, disassembly and cleaning time, it usually takes at least 20 minutes to clean the rotor. If the solid content of the material is higher, the frequency of stopping and starting will also increase, greatly increasing labor intensity and reducing efficiency. For example, if the solid concentration of the separated material is 5% and the production capacity is 600L / H, then 5L of solids will be produced every 10 minutes, and the machine must be stopped for slag discharge. The cleaning time is 20 minutes, so the output of a single machine is only 200L / h. In the actual production process, materials with a solid content of 5% or more are everywhere. Obviously, for materials with a higher solid content, the output of a traditional tubular separator with a shutdown type is lower.

[0006] Based on this, some technical data disclose disc separators and horizontal spiral centrifuges, which can realize automatic slag discharge. However, due to the change in structure, the disc separator is similar to a disc, and although the horizontal spiral centrifuge is slender, it is equipped with a spiral pusher inside to form an inner drum, which greatly reduces the rotation speed. The separation factor of the above two devices is generally 2-6 times lower than that of the tubular separator, and the separation effect is quite different. In addition, in order to achieve the purpose of automatic slag discharge, a large number of devices are added, which increases the complexity of the structure, increases the cost, and makes the price high. Not only does it not meet the production of small and medium batches, but also the separation effect is reduced due to the reduction in rotation speed, which does not meet the occasions with high separation accuracy. Summary of the invention

[0007] In order to solve the above technical problems, the tubular separator is changed from the traditional continuous separation and shutdown mode for workers to discharge slag to a continuous separation and automatic slag discharge mode, and the slag discharge does not require stopping the machine, reducing the working speed, or stopping the feeding. The present invention discloses a bottom shaft cover assembly for the rotary drum of a tubular separator, comprising a bottom shaft cover, an upper inner side wall of the bottom shaft cover is provided with a material retaining plate, the material retaining plate and the bottom shaft cover form a first cavity for accommodating solid sediment, the material retaining plate is provided with an overflow channel, and a plurality of slag discharge holes are provided on the inner wall of the bottom shaft cover near the lower end surface of the material retaining plate; a feed through hole connected to the first cavity is provided on the bottom surface of the bottom shaft cover, and the feed through hole is used to insert a Feed nozzle; a ring valve that can move up and down is coaxially arranged on the outside of the bottom shaft cover, and a liquid storage ring is also arranged between the ring valve and the liquid storage ring, and the liquid storage ring is fixedly arranged on the outer wall of the bottom shaft cover; the inner wall of the ring valve and the outer wall of the liquid storage ring form two cavities, an upper cavity and a lower cavity; after the liquid storage ring and the ring valve are installed, there is still an annular cavity, which is the liquid storage cavity; a water spray seat is inserted into the bottom of the ring valve on one side at the corresponding position of the feed through hole, and a water spray seat through hole is opened inside the water spray seat, and the water spray seat through hole is connected with the lower cavity, and a first channel that passes through the lower cavity and the outer wall of the ring valve is opened on the side wall of the bottom of the ring valve.

[0008] As an optional solution of the technical solution of the present invention, an annular sealing gasket is arranged on the outside of the bottom shaft cover at the upper part of the slag discharge hole, and a pressure cap for fixing the annular sealing gasket is arranged on the outside of the annular sealing gasket. When the annular valve moves upward, the annular valve contacts and compacts the annular sealing gasket to seal the slag discharge hole. When the annular valve moves downward, the annular valve moves away from the annular sealing gasket to expose the slag discharge hole.

[0009] As an optional solution of the technical solution of the present invention, a second channel connecting the liquid storage cavity and the upper cavity is opened on the liquid storage ring, and the liquid storage cavity is pre-injected with working fluid.

[0010] As an optional scheme of the technical solution of the present invention, a ring valve protrusion is arranged on the bottom inner wall of the ring valve toward the liquid storage cavity, and the ring valve protrusion can extend into the liquid storage cavity. The ring valve protrusion, the outer wall of the bottom shaft cover, and the inner wall of the liquid storage ring form the liquid storage cavity, and the volume of the liquid storage cavity changes with the up and down movement of the ring valve; a third channel connecting the water spray seat through hole and the lower cavity is opened on the ring valve protrusion; the diameter of the third channel is larger than the diameter of the first channel.

[0011] As an optional solution of the technical solution of the present invention, the outer wall radius r of the upper cavity 11 , the inner radius r of the upper cavity 12 , the outer wall radius r of the lower cavity 21 , the inner radius r of the lower cavity 22 , the outer wall radius r of the liquid storage cavity 31 , the inner radius r of the liquid storage cavity 32 The following relationship is satisfied:

[0012] r 11 =r 21 ,and

[0013] r 22 =r 31 ,and

[0014] r 12 >r 22 >r 32 ,and

[0015] r 11 2 -r 12 2 =r 31 2 -r 32 2 .

[0016] As an optional solution of the technical solution of the present invention, a transverse sealing plate is arranged on the bottom inner wall of the liquid storage ring toward the bottom shaft cover, and the transverse sealing plate and the inner wall of the liquid storage ring and the middle outer wall of the bottom shaft cover form the liquid storage cavity.

[0017] As an optional scheme of the technical solution of the present invention, a fourth channel connecting the liquid storage chamber and the lower chamber is provided on the bottom shaft cover, and the connecting point of the fourth channel and the liquid storage chamber is located at the upper part of the liquid storage chamber, and the distance a between the connecting point of the fourth channel and the lower chamber and the axis of the bottom shaft cover is smaller than the distance b between the through hole of the water spray seat and the axis of the bottom shaft cover, and a water spray baffle is provided above the water spray seat, and the water spray baffle is arranged in a direction away from the axis of the bottom shaft cover.

[0018] As an optional solution of the technical solution of the present invention, the outer wall radius r of the upper cavity 11 , the inner radius r of the upper cavity 12 , the outer wall radius r of the lower cavity 21 , the inner radius r of the lower cavity 22 The following relationship is satisfied:

[0019] r 21 2 -r 22 2 >r 11 2 -r 12 2 .

[0020] As an optional solution of the technical solution of the present invention, an O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the bottom shaft cover, an O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the liquid storage ring, and an O-ring is embedded in the contact between the liquid storage ring and the outer wall of the bottom shaft cover.

[0021] A tubular separator drum comprises a drum tube, wherein a liquid outlet is arranged at the upper portion of the drum tube, and is characterized in that a bottom shaft cover assembly is connected to the lower portion of the drum tube, the outer wall of the drum tube is fixedly connected to the inner wall of the bottom shaft cover, the inner wall of the drum tube is fixedly connected to the outer wall of the material retaining plate, and a feed nozzle for feeding is inserted into the feed through hole.

[0022] The beneficial effects of the present invention are:

[0023] Compared with the traditional tubular separator, the separator using the bottom shaft cover assembly and the drum described in the scheme of the present invention can realize automatic slag discharge without stopping the machine. For example, for the aforementioned tubular separator with a production capacity of 600L / H, when the solid concentration of the material is 5%, the output of a single machine is only 200L / h. The scheme of the present invention can make the tubular separator work in an automatic slag discharge mode, and the solids are automatically discharged during production. The output of a single machine is 600L / h, which is increased by 3 times. For materials with higher solid content, the advantages of the present invention will be more obvious. In addition, a liquid storage chamber is added, so that when the volume of the upper chamber is reduced, the working fluid in it is received by the liquid storage chamber; when the volume of the upper chamber increases, the working fluid will be replenished by the liquid storage chamber, which increases the centrifugal hydraulic pressure of the upper chamber, thereby increasing the centrifugal hydraulic pressure that pushes the ring valve to rise, and finally increasing the stability of the slag discharge hole seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the structure of a drum of a tubular separator in the prior art;

[0026] Figure 2 It is a schematic diagram of the structure of the drum of the tubular separator in the present invention;

[0027] Figure 3 It is a cross-sectional schematic diagram of the bottom shaft cover assembly when the slag discharge hole is blocked in the first embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the ring valve in the first embodiment of the present invention;

[0029] Figure 5 It is a cross-sectional schematic diagram of the bottom shaft cover assembly when the slag discharge hole is in an open state in the first embodiment of the present invention;

[0030] Figure 6 is a cross-sectional schematic diagram of a bottom shaft cover assembly in Embodiment 2 of the present invention;

[0031] Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0032] Reference numerals:

[0033] 100-drum head; 200-drum tube; 300-bottom shaft cover assembly; 310-bottom shaft cover; 311-slag discharge hole; 312-fourth channel; 313-feeding through hole; 320-blocking plate; 321-overflow channel; 330-annular sealing gasket; 340-pressure cap; 350-ring valve; 351-first channel; 352-ring valve protrusion; 353-third channel; 360-liquid storage ring; 361-second channel; 362-lateral blocking plate; 370-O-ring; 391-upper cavity; 392-liquid storage cavity; 393-lower cavity; 394-first cavity; 410-water spray seat; 411-water spray seat through hole; 412-water spray seat baffle; 420-feeding nozzle. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or it can be connected through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0038] Traditional tubular separator drum Figure 1 As shown, the drum is composed of a drum head 100, a drum barrel 200 and a bottom shaft cover assembly 300. Figure 2 As shown, the present invention has made significant improvements mainly on the bottom shaft cover assembly based on the traditional tubular separator drum. Before introducing the technical solution of the present invention, the concept of centrifugal hydraulics is first clarified.

[0039] When the centrifuge rotates at high speed, the liquid in the drum forms centrifugal hydraulic pressure in the centrifugal force field. The pressure is calculated by the following formula:

[0040]

[0041] in:

[0042] P-centrifugal hydraulic;

[0043] γ-fluid weight;

[0044] ω-drum angular velocity;

[0045] R-liquid ring outer radius;

[0046] r-inner radius of liquid ring;

[0047] g - acceleration due to gravity;

[0048] The formula shows that under the same speed conditions, the size of the centrifugal hydraulic pressure is mainly affected by the radius difference of the liquid ring and has nothing to do with the height of the liquid ring.

[0049] The technical solution of the present invention is described in detail below in conjunction with two embodiments.

[0050] Embodiment 1:

[0051] like Figure 3 As shown, the bottom shaft cover assembly 300 includes a bottom shaft cover 310, a material retaining plate 320, an annular seal 330, a pressure cap 340, a ring valve 350, a liquid storage ring 360 and O-rings 370 of various specifications. These parts constitute multiple chambers, including an upper chamber 391, a liquid storage chamber 392, a lower chamber 393 and a first cavity 394 for depositing solid sediment. The O-ring 370 seals the liquid and prevents it from leaking, thereby ensuring that the mechanism can operate smoothly. The annular seal 330 is fixed to the bottom shaft cover 310 through the pressure cap 340, so that the side of the annular seal 330 is compacted to prevent the material from leaking from the edge of the annular seal 330 after being compressed.

[0052] An overflow channel 321 is provided on the retaining plate 320 for the liquid to overflow after separation, and a plurality of slag discharge holes 311 are provided on the inner wall of the bottom shaft cover 310 near the lower end surface of the retaining plate 320. The holes are through holes of a certain shape and communicate with the outside. The number and size of the holes should be appropriately increased while ensuring the mechanical strength so as to reduce the accumulation of solid materials between two adjacent holes.

[0053] In addition, a water spray seat 410 is installed on the lower supporting mechanism of the rotating drum outside the bottom shaft cover 310. The water spray seat 410 is inserted from the bottom of the ring valve 350. A water spray seat through hole 411 is opened inside the water spray seat 410. The water spray seat through hole 411 is connected with the lower cavity 393. A first channel 351 is opened on the side wall of the bottom of the ring valve 350, which passes through the lower cavity 393 and the outer wall of the ring valve 350.

[0054] The liquid storage ring 360 is provided with a second channel 361 connecting the liquid storage cavity 392 and the upper cavity 391. The working liquid injected into the liquid storage cavity 392 in this design can be water or other liquids. As long as the selection is appropriate, it can also meet the use requirements. In general, the selection of working liquid is based on the following principles:

[0055] 1) Low price;

[0056] 2) Low viscosity and easy to flow;

[0057] 3) Not flammable, explosive, or volatile;

[0058] 4) Non-corrosive to metal, rubber and other materials.

[0059] In order to facilitate the addition of the material to be separated into the drum, a feed hole 313 connected to the first cavity 394 is opened on the bottom surface of the bottom shaft cover 310, and the feed hole 313 is used to insert a feed nozzle 420; wherein the feed nozzle 420 is installed below the drum.

[0060] The water spray seat 410 and the feed nozzle 420 are fixed, do not participate in the rotation of the drum, and maintain a certain safety distance from the rotating parts to avoid scratches during work.

[0061] In this embodiment, a ring valve protrusion 352 is arranged on the bottom inner wall of the ring valve 350 toward the liquid storage chamber 392, and the ring valve protrusion 352 can extend into the liquid storage chamber 392. A third channel 353 connecting the water spray seat through hole 411 and the lower chamber 393 is opened on the ring valve protrusion 352, and the diameter of the third channel 353 is greater than the diameter of the first channel 351.

[0062] The specific structure of the ring valve 350 is as follows: Figure 4 As shown, the radius of the outer wall of the upper cavity is r 11 , the inner radius of the upper cavity r 12 , the radius of the outer wall of the lower cavity r 21 , the inner radius of the lower cavity r 22 , the radius of the outer wall of the liquid storage chamber r 31 , the inner radius of the liquid storage cavity r 32 The following relationship is satisfied:

[0063] r 11 =r 21 ,and

[0064] r 22 =r 31 ,and

[0065] r 12 >r 22 >r 32 ,and

[0066] r 11 2 -r 12 2 =r 31 2 -r 32 2 .

[0067] After the equipment is started, the drum rotates at high speed along its own axis, and the working fluid in the liquid storage chamber 392 enters the upper chamber 391 through the second channel 361, and then rotates and generates centrifugal hydraulic pressure P1, which acts on the ring valve 350, causing the ring valve 350 to move upward and compact with the annular seal 330. By referring to the calculation of the flange sealing conditions, the force of the ring valve 350 on the annular seal 330 is about 30 times the pressure generated by the solid material in the first cavity 394 where the solid settles in the drum, and the slag discharge hole 311 is closed. The material containing solids enters the bottom shaft cover 310 through the feed nozzle 420, and the solids in the material are subjected to the centrifugal force and settle in the first cavity 394 formed by the combination of the bottom shaft cover 310 and the material retaining plate 320, and accumulate around the slag discharge hole 311. The clarified liquid overflows from the overflow channel 321 of the material retaining plate 320, moves upward, and finally flows out from the upper liquid outlet of the drum.

[0068] When slag discharge is required, the operating water enters the lower chamber 393 through the water spray seat 410 and the third channel 353. 11 and the outer wall radius r of the lower cavity 393 21 equal, and the inner radius r of the upper cavity 12 >Inner radius r of the lower cavity 22 Therefore, the hydraulic pressure P2 of the liquid in the lower chamber 393 is greater than the hydraulic pressure P1 of the liquid in the upper chamber 391, pushing the ring valve 350 downward, causing the volume of the upper chamber 391 to decrease, and the working fluid is gradually pressed back into the liquid storage chamber 392. The working fluid in the liquid storage chamber 392 forms a centrifugal hydraulic pressure P3. As the volume of the upper chamber 391 continues to decrease, the working fluid in the liquid storage chamber 392 increases, and the formed P3 becomes larger and larger. Therefore, the downward centrifugal hydraulic pressure acting on the ring valve 350 is P2+P3. Figure 5 As shown, the slag discharge hole 311 is opened, and the solid sediment is thrown out of the drum under the action of centrifugal force.

[0069] After the slag discharge is completed, the operating water is turned off, and the operating water in the lower chamber 393 is discharged through the first channel 351, so the centrifugal hydraulic pressure P1 of the lower chamber 393 gradually decreases until it reaches 0. 11 =r 21 , r 22 =r 31 , and r 12 >r 22 >r 32 Therefore, under the action of centrifugal hydraulic pressure, the working fluid in the liquid storage chamber 392 flows back to the upper chamber 391 through the second channel 361, and P3 gradually decreases until it reaches 0. Under the action of the hydraulic pressure P1 of the liquid in the upper chamber 391, the annular valve 350 moves up again to block the slag discharge hole 311.

[0070] In addition, due to r 11 2 -r 12 2 =r 31 2 -r 32 2 That is, the annular projection area of ​​the upper chamber 391 in the axial direction is equal to the annular projection area of ​​the liquid storage chamber 392 in the axial direction. Therefore, when the ring valve 350 descends, the volume of the upper chamber 391 decreases, which is equal to the volume of the liquid storage chamber 392 increases; when the ring valve 350 rises, the volume of the upper chamber 391 increases, which is equal to the volume of the liquid storage chamber 392 decreases. This design method allows the ring valve 350, the bottom shaft cover 310 and the liquid storage ring 360 to form a double piston structure, so that the volume of the liquid storage chamber 392 changes synchronously with the volume of the upper chamber 391 as the ring valve 350 reciprocates. This way, even if there is no air hole connected to the outside world, air blockage will not occur, and it is guaranteed that the working fluid will not be lost.

[0071] In addition, by calculating the flow rate, a suitable first channel 351 is processed, and then a suitable operating liquid pump is selected according to the flow rate of the first channel 351. The flow rate of the pump must be greater than the flow rate of the first channel 351, and the difference between the two is the operating water flow rate. The ratio of the volume of the lower cavity 393 to the operating water flow rate is the opening time of the slag discharge hole 311.

[0072] Embodiment 2:

[0073] like Figure 6 and Figure 7 As shown, the structure of the liquid storage ring 360 in this embodiment is different from that in the first embodiment. Specifically, a transverse blocking plate 362 is provided on the bottom inner wall of the liquid storage ring 360 toward the bottom shaft cover 310, and a liquid storage cavity 392 is formed between the transverse blocking plate 362 and the inner side wall of the liquid storage ring 360 and the middle outer wall of the bottom shaft cover 310. Therefore, in this embodiment, during actual operation, the volume of the liquid storage cavity 392 will not change as the ring valve 350 moves up and down.

[0074] The bottom shaft cover 310 is provided with a fourth channel 312 communicating with the liquid storage chamber 392 and the lower chamber 393 . The fourth channel 312 can effectively avoid air resistance caused by the change in volume of the upper chamber 391 during the movement of the ring valve 350 .

[0075] The connection point between the fourth channel 312 and the liquid storage chamber 392 is located at the upper part of the liquid storage chamber 392.

[0076] In this embodiment, the outer wall radius r of the upper cavity is 11 , the inner radius r of the upper cavity 12 , the outer wall radius r of the lower cavity 21 , the inner radius r of the lower cavity 22 The following relationship is satisfied:

[0077] r 21 2 -r 22 2 >r 11 2 -r 12 2 .

[0078] Similar to the first embodiment, a certain amount of working fluid has been injected into the liquid storage chamber 392 in advance. After the equipment is started, the drum rotates at high speed along its own axis, and the working fluid in the liquid storage chamber 392 enters the upper chamber 391 through the second channel 361, and then rotates and generates centrifugal hydraulic pressure, which acts on the ring valve 350, causing the ring valve 350 to move upward, compact with the annular sealing gasket 330, and seal the slag discharge hole 311. The material enters the bottom shaft cover 310 at a certain angle through the feed nozzle 420, and the solid is settled into the first cavity 394 formed by the combination of the bottom shaft cover 310 and the material retaining plate 320 under the action of centrifugal force, and accumulates around the slag discharge hole 311. The clarified liquid overflows from the overflow channel 321 at the inner diameter of the material retaining plate 320, moves upward, and finally flows out from the upper liquid outlet of the drum.

[0079] When slag discharge is required, the operating water enters the lower chamber 393 through the water spray seat 410. Since the distance a between the fourth channel 312 and the lower chamber 393 and the axis of the bottom shaft cover 310 is less than the distance b between the water spray seat through hole 411 and the axis of the bottom shaft cover 310. A water spray baffle 412 is provided above the water spray seat 410, and the water spray baffle 412 is arranged in a direction away from the axis of the bottom shaft cover 310. Therefore, the operating water entering the lower chamber 393 from the nozzle seat 410 will not enter the liquid storage chamber 392 through the fourth channel 312.

[0080] Due to r 21 2 -r 22 2 >r 112 -r 12 2 Therefore, the centrifugal hydraulic pressure generated by the operating water in the lower chamber 393 is greater than the centrifugal hydraulic pressure generated by the working fluid in the upper chamber 391. The hydraulic pressure difference between the two pushes the ring valve 350 downward, the slag discharge hole 311 opens, and the solid sediment is thrown out of the drum under the action of centrifugal force.

[0081] During the downward movement of the ring valve 350, the working fluid in the upper chamber 391 is pressurized and flows back into the liquid storage chamber 392 through the second channel 361. Since the upper chamber 391 and the liquid storage chamber 392 are connected to the atmosphere through the fourth channel 312, the change in the volume of the upper chamber 391 will not cause air resistance. And since the connection between the fourth channel 312 and the liquid storage chamber 392 is located at the upper part of the liquid storage chamber 392 close to the central axis, it can be ensured that the working fluid in the liquid storage chamber 392 will not flow out of the fourth channel 312.

[0082] After the slag discharge is completed, the operating water is turned off, and the operating water of the lower chamber 393 is discharged through the first channel 351. The pressure of the lower chamber 393 disappears, and the working fluid in the liquid storage chamber 392 flows back to the upper chamber 391 through the second channel 361. The annular valve 350 moves up again under the pressure of the centrifugal liquid in the upper chamber 391 to close the slag discharge hole 311.

[0083] Compared with the first embodiment, the solution in this embodiment does not have high requirements on the amount of working fluid injected into the liquid storage chamber 392 in advance, and is relatively simple and convenient to manufacture and install.

[0084] The technical solutions of the above two embodiments are both provided with an upper chamber and a lower chamber. The centrifugal pressure difference formed by the liquid in the two chambers drives the ring valve to reciprocate up and down to achieve the purpose of opening and closing the slag discharge hole, thereby realizing automatic slag discharge without stopping the machine, greatly improving the separation efficiency of the tubular separator, especially for materials with high solid content, the advantages are more obvious. .

[0085] In addition, a liquid storage chamber is added, so that when the volume of the upper chamber is reduced, the working fluid in it is stored in the liquid storage chamber; when the volume of the upper chamber is increased, the working fluid will be replenished by the liquid storage chamber, which increases the centrifugal hydraulic pressure of the upper chamber, and then increases the centrifugal hydraulic pressure that pushes the ring valve to rise, and finally increases the stability of the slag discharge hole sealing.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the purpose and principle of the present invention shall be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A bottom shaft cover assembly for a tubular separator drum, comprising a bottom shaft cover, characterized in that: The upper inner side wall of the bottom shaft cover is provided with a material retaining plate, and the material retaining plate and the bottom shaft cover enclose a first cavity for accommodating solid sediment, the material retaining plate is provided with an overflow channel, and a plurality of slag discharge holes are provided on the inner wall of the bottom shaft cover near the lower end surface of the material retaining plate; a feed through hole connected to the first cavity is provided on the bottom surface of the bottom shaft cover, and the feed through hole is used to insert a feed nozzle; an annular valve that can move up and down is coaxially provided on the outside of the bottom shaft cover and the bottom shaft cover, and a liquid storage is also provided between the annular valve and the bottom shaft cover. The ring is fixedly arranged on the outer wall of the bottom shaft cover; the inner wall of the ring valve and the outer wall of the liquid storage ring form two cavities, an upper cavity and a lower cavity; after the liquid storage ring and the ring valve are installed, there is still an annular cavity, which is the liquid storage cavity; a water spray seat is inserted into the bottom of the ring valve at one side of the corresponding position of the feed through hole, a water spray seat through hole is opened inside the water spray seat, the water spray seat through hole is connected with the lower cavity, and a first channel penetrating the lower cavity and the outer wall of the ring valve is opened on the side wall of the bottom of the ring valve; The outside of the bottom shaft cover is provided with an annular sealing gasket at the upper part of the slag discharge hole, and the outside of the annular sealing gasket is provided with a pressure cap for fixing the annular sealing gasket. When the annular valve moves upward, the annular valve contacts and compacts the annular sealing gasket to block the slag discharge hole. When the annular valve moves downward, the annular valve moves away from the annular sealing gasket to expose the slag discharge hole. The liquid storage ring is provided with a second channel connecting the liquid storage cavity and the upper cavity, and the liquid storage cavity is pre-injected with working liquid; A ring valve protrusion is arranged on the bottom inner wall of the ring valve toward the liquid storage cavity, and the ring valve protrusion can extend into the liquid storage cavity. The ring valve protrusion, the outer wall of the bottom shaft cover, and the inner wall of the liquid storage ring form the liquid storage cavity, and the volume of the liquid storage cavity changes with the up and down movement of the ring valve; a third channel connecting the water spray seat through hole and the lower cavity is opened on the ring valve protrusion; the diameter of the third channel is larger than the diameter of the first channel.

2. The bottom shaft cover assembly for the tubular separator drum according to claim 1, characterized in that: The outer wall radius r of the upper cavity 11 , the inner radius r of the upper cavity 12 , the outer wall radius r of the lower cavity 21 , the inner radius r of the lower cavity 22 , the outer wall radius r of the liquid storage cavity 31 , the inner radius r of the liquid storage cavity 32 The following relationship is satisfied: r 11 =r 21 ,and r 22 =r 31 ,and r 12 >r 22 >r 32 ,and r 11 2 -r 12 2 ＝r 31 2 -r 32 2 。 3. The bottom shaft cover assembly for the tubular separator drum according to claim 2, characterized in that: An O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the bottom shaft cover, an O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the liquid storage ring, and an O-ring is embedded in the contact between the liquid storage ring and the outer wall of the bottom shaft cover.

4. A bottom shaft cover assembly for a tubular separator drum, comprising a bottom shaft cover, characterized in that: The upper inner side wall of the bottom shaft cover is provided with a material retaining plate, and the material retaining plate and the bottom shaft cover enclose a first cavity for accommodating solid sediment, the material retaining plate is provided with an overflow channel, and a plurality of slag discharge holes are provided on the inner wall of the bottom shaft cover near the lower end surface of the material retaining plate; a feed through hole connected to the first cavity is provided on the bottom surface of the bottom shaft cover, and the feed through hole is used to insert a feed nozzle; an annular valve that can move up and down is coaxially provided on the outside of the bottom shaft cover and the bottom shaft cover, and a liquid storage is also provided between the annular valve and the bottom shaft cover. The ring is fixedly arranged on the outer wall of the bottom shaft cover; the inner wall of the ring valve and the outer wall of the liquid storage ring form two cavities, an upper cavity and a lower cavity; after the liquid storage ring and the ring valve are installed, there is still an annular cavity, which is the liquid storage cavity; a water spray seat is inserted into the bottom of the ring valve at one side of the corresponding position of the feed through hole, a water spray seat through hole is opened inside the water spray seat, the water spray seat through hole is connected with the lower cavity, and a first channel penetrating the lower cavity and the outer wall of the ring valve is opened on the side wall of the bottom of the ring valve; The outside of the bottom shaft cover is provided with an annular sealing gasket at the upper part of the slag discharge hole, and the outside of the annular sealing gasket is provided with a pressure cap for fixing the annular sealing gasket. When the annular valve moves upward, the annular valve contacts and compacts the annular sealing gasket to block the slag discharge hole. When the annular valve moves downward, the annular valve moves away from the annular sealing gasket to expose the slag discharge hole. The liquid storage ring is provided with a second channel connecting the liquid storage cavity and the upper cavity, and the liquid storage cavity is pre-injected with working liquid; A transverse blocking plate is arranged on the bottom inner wall of the liquid storage ring toward the bottom shaft cover, and the transverse blocking plate, the inner wall of the liquid storage ring, and the middle outer wall of the bottom shaft cover form the liquid storage cavity; The bottom shaft cover is provided with a fourth channel connecting the liquid storage chamber and the lower chamber, the connecting point between the fourth channel and the liquid storage chamber is located at the upper part of the liquid storage chamber, the distance a between the connecting point between the fourth channel and the lower chamber and the axis of the bottom shaft cover is smaller than the distance b between the through hole of the water spray seat and the axis of the bottom shaft cover, and a water spray baffle is provided above the water spray seat, and the water spray baffle is arranged in a direction away from the axis of the bottom shaft cover.

5. The bottom shaft cover assembly for the drum of a tubular separator according to claim 4, characterized in that: The outer wall radius r of the upper cavity 11 , the inner radius r of the upper cavity 12 , the outer wall radius r of the lower cavity 21 , the inner radius r of the lower cavity 22 The following relationship is satisfied: r 21 2 -r 22 2 ＞r 11 2 -r 12 2 。 6. The bottom shaft cover assembly for the drum of a tubular separator according to claim 5, characterized in that: An O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the bottom shaft cover, an O-ring is embedded in the contact between the inner wall of the ring valve and the outer wall of the liquid storage ring, and an O-ring is embedded in the contact between the liquid storage ring and the outer wall of the bottom shaft cover.

7. A tubular separator drum, characterized in that: It includes a drum, and a liquid outlet is arranged on the upper part of the drum, and is characterized in that the lower part of the drum is connected to the bottom shaft cover assembly as described in any one of claims 1 to 6, the outer wall of the drum is fixedly connected to the inner wall of the bottom shaft cover, the inner wall of the drum is fixedly connected to the outer wall of the baffle plate, and a feed nozzle for feeding is inserted into the feed through hole.

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