A dynamic fluid seal apparatus and method of implementation

Abstract

The present application relates to a kind of dynamic fluid sealing device and implementation method, dynamic fluid sealing device includes: barrel, material inlet and material outlet are provided on the barrel, material level detector, feed controller and feed control valve, the actual material level is monitored in the barrel, and actual material level value is sent to the feed controller, the feed controller compares the actual material level value with the predetermined value, and according to the comparison result, valve opening degree instruction is sent to the feed control valve, and the feed control valve controls the opening degree of valve according to the instruction of the feed controller, to change the flow of feed, control the material level at the predetermined value to achieve the effect of sealing, effectively, safely and reliably eliminate the gas pressure instability phenomenon, while controlling maintenance cost.

Description

Technical Field

[0001] This invention relates to a dynamic fluid sealing device, which can be used in all applications requiring particle-powder separation, such as pharmaceuticals, chemicals, and food, and can also be used in industrial and mining applications involving the pipeline transportation of particle-powder materials. Background Technology

[0002] In industries such as chemical and pharmaceutical, granular materials often contain powder. The presence of powder can affect the quality of the granules, so the powder content is usually limited to an acceptable range. For example, LDPE granules typically require a powder content of less than or equal to 50 PPM, while PC granules require an even lower powder content, sometimes as low as 20 PPM. Taking PE granules for power cables as an example, if the powder content in the granules is too high, the insulation of the resulting cables will be poor. Therefore, powder removal from granules is a problem that must be solved.

[0003] To address the issue of granular material de-dust, a granular material purifier (also known as a granular material separator, dust remover, or simply a separator) is typically installed. However, regardless of the type of device installed, any equipment used for dust removal may experience pressure instability. Pressure instability refers to operational instability caused by a pressure difference between the internal and external pressures of the separator. This pressure difference between the discharge / feed side and the interior of the separator affects the stable operation of the corresponding receiving / feeding equipment, and in severe cases, can even cause the receiving equipment on the discharge side to malfunction. Therefore, pressure instability can disrupt the normal operation of the entire system, necessitating the addition of a pressure balancing device to mitigate the instability caused by pressure differentials.

[0004] Traditional pressure balancing devices typically use airflow to control the internal air pressure at, for example, -50 mm water column. However, this negative pressure can cause problems such as drift or error in the metering unit of the discharge receiving device.

[0005] Therefore, how to effectively, safely, and reliably eliminate the phenomenon of air pressure instability is a problem that needs to be further solved in the process of pellet de-powdering. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a dynamic fluid sealing device. This device not only achieves particle de-powdering but also overcomes the problem of air pressure instability. Therefore, using this device offers effective and economical results, and is safe, reliable, and maintenance-free during particle de-powdering.

[0007] The dynamic fluid sealing device of the present invention includes: a cylinder, on which a material inlet and a material outlet are provided, a material level detector, a feed controller, and a feed control valve. The material level detector monitors the actual material level in the cylinder and sends the actual material level value to the feed controller. The feed controller compares the actual material level value with a predetermined value and sends a valve opening command to the feed control valve according to the comparison result. The feed control valve controls the valve opening according to the command of the feed controller, thereby changing the feed flow rate and controlling the material level at the predetermined value.

[0008] In one embodiment of the present invention, the material inlet is at a higher height in the vertical direction than the material outlet.

[0009] In one embodiment of the present invention, the predetermined value is a dynamic value, which can be greater than or equal to the minimum material level required to achieve the sealing effect.

[0010] In one embodiment of the present invention, the shape of the cylinder is a cone, a cylinder, a sphere, a cuboid, a cube, a spiral, or a polygon.

[0011] In one embodiment of the present invention, the feed control valve is a rotary valve or a slide gate valve.

[0012] In one embodiment of the present invention, the level detector is a tuning fork, ultrasonic, or radiation sensor.

[0013] The particle separation system of the present invention includes: a particle separator, and the dynamic fluid sealing device described in the present invention.

[0014] In one embodiment of the present invention, the particle outlet of the particle separator is in sealed communication with the material inlet of the dynamic fluid sealing device.

[0015] In one embodiment of the present invention, the particle separation system includes a plurality of the dynamic fluid sealing devices connected in series or in parallel.

[0016] In one embodiment of the present invention, the particle-powder separation system of the present invention includes: a cylinder, a material level detector, a feed controller, a feed control valve, and a particle-powder separator. The cylinder is provided with a material inlet and a material outlet. The feed control valve is connected to the feed inlet of the particle-powder separator, and the particle outlet of the particle-powder separator is connected to the material inlet of the cylinder. The material level detector monitors the actual material level in the cylinder and sends the actual material level value to the feed controller. The feed controller compares the actual material level value with a predetermined value and sends a valve opening command to the feed control valve according to the comparison result. The feed control valve controls the valve opening according to the command of the feed controller, thereby changing the feed flow rate and controlling the material level in the cylinder at the predetermined value.

[0017] In one embodiment of the present invention, the dynamic fluid sealing device of the present invention includes: a material inlet, a cylinder, a material level detector, a material outlet, a feed control valve, and a feed controller. By controlling the flow of material in or out, a material agglomerate is formed inside the cylinder, and the material level of the material agglomerate is maintained at a predetermined value to achieve sealing.

[0018] The material clump maintained at a predetermined value inside the cylinder creates resistance to the gas at both ends of the dynamic fluid sealing device, thereby achieving a seal.

[0019] The material level detector monitors the actual material level and sends the actual material level value to the feed controller. The feed controller compares the actual material level value with the predetermined value and sends the comparison result to the feed control valve through a control signal. The feed control valve controls the valve opening according to the instruction of the control signal, thereby changing the material flow rate and controlling the material level at the predetermined value.

[0020] The predetermined value is set based on the material properties, material flow rate, internal pressure of the separator, or the throughput of the separator.

[0021] The predetermined value is a dynamic value, which can be greater than or equal to the minimum predetermined value of the material level required to achieve the sealing effect.

[0022] The material clumps can be formed into any shape according to the shape of the cylinder, such as cones, cylinders, spheres, cubes, spirals or multiple variations; the material can be granular powder or liquid.

[0023] Multiple of this dynamic fluid sealing device can be used in series or in parallel.

[0024] The feed control valve is installed at the inlet or outlet of the separator, and the feed control valve can be a rotary valve or a slide gate valve.

[0025] In this invention, material flows into the cylinder from the material inlet and flows out of the cylinder from the material outlet. When the inflow is greater than the outflow, material clumps are formed in the cylinder, generating a material level 'a'. After the material level detector detects the material level 'a', it sends the value to the controller. The controller compares the value of 'a' with a predetermined value 'A' and sends the comparison result to the control valve via a control signal. The control valve controls the valve opening according to the control signal, thereby changing the material flow rate and controlling the material level at the predetermined value 'A'.

[0026] The value A is set according to the material properties, material flow rate, internal pressure of the separator, or the throughput of the separator to achieve a sealing effect.

[0027] Depending on the properties of the material, the material agglomerate can be granular or liquid, so the dynamic fluid sealing device of the present invention can be used not only for granular powder but also for liquid and other materials.

[0028] The material clumps can be formed into any shape according to the shape of the cylinder, such as cones, cylinders, spheres, cubes, cuboids, square pyramids, triangular prisms, triangular pyramids, polygonal pyramids, spirals, or various other shapes. Cones and cylinders are preferred.

[0029] The control valve can be installed at the inlet or outlet of the separator, or at the outlet of the dynamic fluid seal device, with installation at the inlet being preferred. Specifically, a rotary valve, a slide gate valve, or other types of control valve can be used.

[0030] The level detector can be a tuning fork, ultrasonic, or X-ray sensor, or any other sensor capable of measuring the level, depending on the material properties and preferences. One or more detectors can be used, selected according to actual needs.

[0031] A breathing valve can also be installed on the cylinder. The breathing valve plays an auxiliary role and can be a breathing valve device commonly used in this field.

[0032] Depending on the site conditions, if one dynamic fluid sealing device is insufficient, one or more dynamic fluid sealing devices can be used in series or in parallel, etc.

[0033] This invention seals the separator's operation by using dynamically flowing material, thus ensuring that the separator's operation does not interfere with the feeding and receiving processes. Furthermore, because the sealing material is microscopically dynamic, it does not affect the inflow and outflow of granular or powdered materials. This characteristic eliminates the need for additional maintenance of the dynamic fluid sealing device, effectively reducing maintenance costs.

[0034] The dynamic fluid sealing device has a simple structure, and its manufacturing, assembly, installation, and commissioning are all very simple. It does not require special materials, and all materials are readily available.

[0035] Specifically, the working principle of the dynamic fluid sealing device of the present invention is as follows:

[0036] Granular material enters through the material inlet, initially resulting in a higher inflow than outflow. This causes the material level in the cylinder to rise rapidly until it reaches the set level A. Through the coordinated action of the level detector, control valve, and controller, the material level is dynamically stabilized at the predetermined set value A. At this point, the flow rate of material entering the cylinder from the material inlet is the same as the flow rate of material exiting the material outlet. That is, the total amount of material in the cylinder maintains a dynamic balance; the material in the cylinder is always flowing, constantly inflowing and outflowing, with new material entering and old material exiting. At any given moment, the weight and volume of material in the cylinder at level A remain essentially constant (with slight fluctuations). This objectively existing material mass, macroscopically speaking, is a material agglomerate, which can serve a sealing or enclosing function. Microscopically, this material agglomerate is dynamically renewed; granules are constantly entering and exiting, undergoing a process of metabolism.

[0037] Although this material clumping exists in the pipeline into which the material flows, seemingly blocking the pipeline and preventing the material from passing through, the material within this clumping is dynamically updated, and:

[0038] Q inflow = Q outflow

[0039] Therefore, the flow of materials will not be affected.

[0040] Therefore, the presence of this material agglomerate will create resistance to the gas at both ends of the dynamic fluid sealing device, thereby playing a role in sealing or sealing the gas.

[0041] By installing a dynamic fluid sealing device on the discharge side of the particle separator, unimpeded flow of particles and powder can be achieved. The internal pressure of the particle separator will not be affected by the pressure on the discharge side, and the external pressure measured at the discharge side will not be affected by the internal pressure of the particle separator. This ensures that the particle separator and the equipment connected to the discharge side are not affected by pressure interference, achieving a weak correlation between the two pressures, allowing them to operate independently without interference. This effectively, safely, and reliably eliminates pressure instability during the particle de-powdering process.

[0042] By employing the device and method of the present invention, it is possible to achieve the following: the granular and powder materials can flow smoothly, while the internal pressure of the granular and powder separator is not affected by the pressure on the discharge side, and the external pressure on the discharge side is not affected by the internal pressure of the granular and powder separator. This ensures that the equipment connected to the discharge side of the granular and powder separator is not affected by pressure interference, achieving a weak correlation between the two pressures, allowing them to operate independently without interfering with each other, thereby effectively and reliably improving the problem of air pressure instability. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of one embodiment of the dynamic fluid sealing device of the present invention. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0045] Example 1

[0046] As attached Figure 1 As shown, the dynamic fluid sealing device in this embodiment (as indicated by the dashed lines) includes: a cylinder 2, on which a material inlet 1 and a material outlet 4 are provided, a material level detector 3, a feed controller 6, and a feed control valve 5. The material level detector 3 monitors the actual material level inside the cylinder 2 and sends the actual material level value to the feed controller 6. The feed controller 6 compares the actual material level value with a predetermined value and sends a valve opening command to the feed control valve 5 according to the comparison result. The feed control valve 5 controls the valve opening according to the command of the feed controller, thereby changing the feed flow rate and controlling the material level at the predetermined value. The predetermined value is a dynamic value, which can be greater than or equal to the minimum material level required to achieve a sealing effect. The feed control valve 5 is a rotary valve or a slide gate valve, and the material level detector 3 is a tuning fork, ultrasonic, or X-ray sensor.

[0047] Granular material flows into the cylinder 2 of the dynamic fluid sealing device from the material inlet 1 and is then discharged through the material outlet 4. If more material enters than exits, granular material will accumulate inside the cylinder 2, forming dynamic material clumps. These clumps are microscopically dynamic flow materials, but macroscopically relatively stable granular material clumps. They form during material flow and disappear after the fluid flow ends. To create resistance to the gas at both ends of the dynamic fluid sealing device, and thus achieve a seal on the separator when the dynamic fluid sealing device is used in conjunction with a particle separator, ensuring that the separator pressure does not affect the operation of other equipment, the material clump level must be maintained at a predetermined value A. The value of A is set according to the material properties, material flow rate, internal pressure of the separator, or the separator's throughput.

[0048] A larger A value for the material clumps results in better sealing, but an excessively large A value increases cost and dust; conversely, an excessively small A value fails to achieve effective sealing and makes material clumps difficult to control. Therefore, the predetermined value A can be set as a dynamic value according to requirements. Its value can be greater than or equal to the minimum predetermined value of the material position required to achieve a sealing effect. A larger predetermined value results in better sealing, while a smaller predetermined value results in lower costs. During operation, the A value can be flexibly selected according to actual conditions. For example, the A value for material clumps can be set between 0.2 meters and 1.0 meters. This range not only ensures a good sealing effect but also keeps costs relatively low.

[0049] Example 2

[0050] As attached Figure 1As shown, the particle-powder separation system of this embodiment includes: a cylinder 2, on which a material inlet 1 and a material outlet 4 are provided, a material level detector 3, a feed controller 6, a feed control valve 5, and a particle-powder separator 9. The feed control valve 5 is connected to the feed inlet of the particle-powder separator 9, and the particle outlet of the particle-powder separator 9 is connected to the material inlet 1 of the cylinder 2. The material level detector 3 monitors the actual material level inside the cylinder 2 and sends the actual material level value to the feed controller 6. The feed controller 6 compares the actual material level value with a predetermined value and sends a valve opening command to the feed control valve 5 according to the comparison result. The feed control valve 5 controls the valve opening according to the command of the feed controller 6, thereby changing the feed flow rate and controlling the material level inside the cylinder 2 at the predetermined value.

[0051] This application accepts various modifications and alternatives, and specific embodiments have been shown in the accompanying drawings with the aid of examples and have been described in detail herein. However, this application is not intended to be limited to the specific forms disclosed. Rather, this application is intended to include all modifications, equivalents, and alternatives within the scope of this application, which is defined by the appended claims and their legal equivalents.

Claims

1. A particle-powder separation system, characterized in that, The particle separation system includes: Particle separator and dynamic fluid sealing device; The dynamic fluid sealing device includes: The cylinder body is equipped with a material inlet and a material outlet. Material level detector, Feed controller, Feed control valve, The feed control valve is connected to the feed inlet of the particle separator, and the particle outlet of the particle separator is connected to the material inlet of the cylinder. The level detector monitors the actual material level inside the cylinder and sends the actual level value to the feed controller. The feed controller compares the actual level value with a predetermined value and sends a valve opening command to the feed control valve based on the comparison result. The feed control valve controls its opening according to the command from the feed controller, thereby changing the feed flow rate and controlling the material level inside the cylinder at the predetermined value. The predetermined value is a dynamic value, and the value of the dynamic value is greater than or equal to the minimum material level required to achieve a sealing effect. The predetermined value is 0.2 meters to 1 meter. The particle outlet of the particle separator is in sealed connection with the inlet of the dynamic fluid sealing device. The feed control valve is installed at the inlet of the separator.

2. The particle separation system according to claim 1, wherein the material inlet is at a higher height in the vertical direction than the material outlet.

3. The particle separation system according to claim 1, wherein the shape of the cylinder is a cone, cylinder, sphere, cuboid, or spiral.

4. The particle separation system according to claim 1, wherein the feed control valve is a rotary valve or a gate valve.

5. The particle separation system according to claim 1, wherein the level detector is a tuning fork, ultrasonic, or radiation sensor.

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