Powder pressurized conveying system and method

Abstract

The application provides a powder pressurized conveying system and a conveying method. The system comprises a feeding tank, a pressurized pumping system and a discharging tank. The internal pressure of the feeding tank is maintained at a first pressure; the pressurized pumping system comprises a pumping device with a pressure cavity in its internal structure and a pressure medium circulating device in communication with the pressure cavity through a medium pipeline, and the pressure cavity corresponds to an elastic diaphragm embedded in the cavity wall; the internal pressure of the discharging tank is maintained at a second pressure greater than the first pressure; and the diaphragm can be concave to form a receiving space for receiving the powder when the pressure cavity is depressurized, and can be convex to compress the receiving space when the pressure cavity is pressurized. According to the technical scheme of the application, the deformation of the diaphragm is used to realize the pressurized conveying of the powder, the device volume of the whole conveying system is greatly reduced, and the process flow is greatly simplified; and the whole conveying system does not need any valve member in structure, thereby avoiding the problem that the valve is prone to wear and blockage, and the conveying system needs frequent maintenance.

Description

Technical Field

[0001] This invention relates to the field of pressurized coal gasification technology, and particularly to a pressurized conveying system and method for conveying pulverized materials. Background Technology

[0002] Pressurized coal gasification is currently the mainstream clean coal utilization technology, widely used in the oil refining and chemical industries such as hydrogen production, synthetic ammonia, methanol, and fuel gas. Because the pulverized coal gasification process is a reaction carried out under high pressure, pressurizing and transporting the pulverized coal to the gasifier is an indispensable technical step in pressurized coal gasification technology.

[0003] Currently, the industrial pressurized coal conveying technology uses alternating pressurization conveying in pressurized tanks. The principle is that the pressurized tank, under near-atmospheric pressure, is connected to an atmospheric pressure pulverized coal storage tank located above it. Gravity is used to receive the pulverized coal from the storage tank. When the pulverized coal level in the pressurized tank reaches a set point, it is isolated from the storage tank via a valve between the two. Then, high-pressure inert gas is used to pressurize the pressurized tank. When the pressure reaches a set value, the valve between the pressurized tank and the feed tank located below it is opened, connecting them and allowing gravity to feed all the pulverized coal into the feed tank. After all the pulverized coal in the pressurized tank has been fed into the feed tank, the valve between the two is closed for isolation. Afterward, the pressurized tank releases the pressurizing gas, reducing the pressure to near-atmospheric pressure before reconnecting to the pulverized coal storage tank, and this cycle repeats.

[0004] The current pulverized coal pressurized conveying technology has at least two technical drawbacks. First, existing technology uses inert gas to alternately pressurize and depressurize the pressurization tank to increase the pressure of pulverized coal from atmospheric pressure to high pressure. The conveying system requires corresponding valves for pressure control. During production, the valves on the pipeline need to be opened and closed frequently, and because the material contains pulverized coal particles, the valves are severely eroded and their service life is greatly shortened, resulting in frequent maintenance of the entire conveying system. Furthermore, due to the large number of valves and other components, blockages are easily caused in the pulverized material environment. Summary of the Invention

[0005] To address the problems of frequent maintenance due to shortened valve life and easy blockage in existing pulverized coal pressurized conveying technology, this invention proposes a pulverized material pressurized conveying system and conveying method.

[0006] In a first aspect, the present invention provides a powder pressurized conveying system, comprising:

[0007] The feed storage tank is constructed such that the internal pressure is maintained at a primary pressure.

[0008] A pressurized pumping system includes a pumping device with an internal pressure chamber and a pressure medium circulation device connected to the pressure chamber via a medium pipeline. The inlet of the pumping device is connected to the outlet of the feed tank. The pressure chamber has an elastic diaphragm embedded in its wall.

[0009] The discharge storage tank is constructed such that the internal pressure is maintained at a second pressure, which is greater than the first pressure, and the inlet of the discharge storage tank is connected to the outlet of the pumping device.

[0010] The diaphragm can be recessed to form a receiving space for receiving powder when the pressure chamber is depressurized, and the diaphragm can be bulged outward to compress the receiving space when the pressure chamber is pressurized, so as to pressurize the powder by squeezing to match the second pressure.

[0011] In one embodiment, the feed tank and the discharge tank are respectively connected to a first gas source and a second gas source via pipelines. The first gas source and the second gas source are used to deliver pressurized gas with pressures matching the first pressure and the second pressure to the feed tank and the discharge tank, respectively.

[0012] In one embodiment, a first activation conveyor and a second activation conveyor are respectively provided between the feed tank and the pumping device and at the outlet end of the discharge tank. The first gas source and the second gas source are respectively connected to the first activation conveyor and the second activation conveyor through branch pipelines.

[0013] In one embodiment, the system further includes a powder filter connected to the feed tank and the discharge tank via pipelines, the powder filter being provided with a gas vent and a powder recovery port connected to the feed tank.

[0014] In one embodiment, the pressurized gas supplied by the first gas source is nitrogen, and the pressurized gas supplied by the second gas source is either nitrogen or carbon dioxide.

[0015] In one embodiment, the pumping device includes:

[0016] The outer casing has an inlet, a pumping chamber, and an outlet sequentially distributed along a first direction; and

[0017] The impeller is constructed as a rotating housing structure filled within the pumping chamber, the axis of the rotating housing structure being orthogonal to the first direction, the impeller being constructed to rotate about the axis of the rotating housing structure, the pressure chamber being constructed inside the impeller, and the diaphragm being embedded in the housing of the impeller.

[0018] In one embodiment, the impeller has a plurality of pressure chambers with uniform volume, each pressure chamber corresponding to a diaphragm, and each pressure chamber and each diaphragm are distributed along the rotation direction of the impeller.

[0019] In one embodiment, short shafts serving as impeller shafts are respectively constructed on opposite sides of the impeller, the short shafts passing through the housing and at least one of the short shafts being connected to a power mechanism for driving the impeller.

[0020] Wherein, at least one of the short shafts is constructed as a hollow shaft, and the interior of the hollow shaft is divided into a plurality of medium channels that correspond one-to-one with each of the pressure chambers, and the pressure chambers are constructed to connect to the medium pipelines through the medium channels.

[0021] In one embodiment, the hollow shaft is fitted with an outer sleeve on the portion outside the housing. One end of the outer sleeve is fixed to the outer wall of the housing. The outer sleeve has an interface connected to the medium pipeline. The interface includes an input interface and an output interface that are offset from each other in the circumferential direction of the outer sleeve.

[0022] The plurality of medium channels are distributed circumferentially along the hollow shaft, and the hollow shaft is provided with a plurality of through holes distributed circumferentially and corresponding one-to-one with each of the medium channels. The through holes can correspond to the input interface and the output interface as the impeller rotates, so as to pressurize and depressurize the corresponding pressure chambers respectively.

[0023] In one embodiment, the pumping chamber is configured as a spherical cavity, the impeller is configured as a spherical shell structure, and the diaphragm is configured as a spherical structure whose radius of curvature is consistent with that of the impeller spherical surface when it bulges outward.

[0024] Secondly, the present invention provides a method for pressurizing and conveying powder, which is applied to the aforementioned powder pressurizing and conveying system. The conveying method includes the following steps:

[0025] The pressure chamber inside the pumping device is depressurized by a pressure medium circulation device, causing the diaphragm corresponding to the pressure chamber to be recessed inward to form a receiving space corresponding to the material receiving direction of the feed tank. The receiving space is used to accommodate the powder falling from the feed tank into the pumping device.

[0026] Start the power unit connected to the pumping device to drive the impeller where the pressure chamber is located to rotate to the receiving space, which is offset from the incoming material direction and corresponds to the inner wall of the pumping device;

[0027] The pressure chamber is pressurized by the pressure medium circulation device, causing the diaphragm to bulge outward and compress the receiving space, and together with the inner wall of the pumping device, it squeezes the powder in the receiving space.

[0028] Start the power unit to drive the impeller to rotate so that the discharge direction of the receiving space and the discharge tank corresponds to that of the discharge tank, so that the diaphragm bulges outward and forces the powder in the receiving space to fall into the discharge tank.

[0029] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0030] The powder pressurized conveying system and method provided by the present invention have at least the following advantages compared with the prior art:

[0031] The present invention discloses a powder pressurization conveying system and conveying method, which utilizes the deformation of the diaphragm structure of the pumping device to achieve pressurization conveying of powder. The conveying system does not require the large-scale pressurization and depressurization equipment required by the prior art, and the equipment volume of the entire conveying system is greatly reduced and the process flow is greatly simplified. Moreover, the entire conveying system does not require any valve components in its structure, thus avoiding the problem of frequent maintenance of the conveying system due to easy wear and blockage of valves. Attached Figure Description

[0032] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0033] Figure 1 A schematic diagram of the overall structure of the powder pressurized conveying system of the present invention is shown;

[0034] Figure 2 A schematic diagram of the overall structure of the pressurized pumping system of the present invention is shown;

[0035] Figure 3 A schematic diagram of the overall structure of the pumping device of the present invention is shown;

[0036] Figure 4 Showing Figure 3 Schematic diagram of the AA-direction section;

[0037] Figure 5 Showing Figure 3 Schematic diagram of the BB-direction section;

[0038] Figure 6 Showing Figure 4 Schematic diagram of the C-axis section;

[0039] Figure 7 Showing Figure 4 Schematic diagram of the DD section.

[0040] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0041] Figure label:

[0042] 10. Pressurized pumping system; 101. Pumping device; 102. Pressure medium circulation device; 103. Medium pump; 104. Pressure stabilizing valve; 20. Feed tank; 30. Discharge tank; 40. First air source; 50. Second air source; 60. First activation conveyor; 70. Second activation conveyor; 80. Powder filter;

[0043] 1. Outer shell; 11. Inlet; 12. Pumping chamber; 121. Connection port; 13. Outlet; 2. Impeller; 21. Pressure chamber; 22. Baffle plate; 23. Opening; 3. Diaphragm; 31. Material receiving space; 4. Short shaft; 41. Medium channel; 5. Outer tube; 51. Output interface; 52. Input interface; 6. Sealing gasket. Detailed Implementation

[0044] The invention will now be further described with reference to the accompanying drawings.

[0045] An embodiment of the present invention provides a powder pressurized conveying system, comprising:

[0046] The feed storage tank 20 is constructed such that the internal pressure is maintained at a first pressure.

[0047] A pressurized pumping system 10 includes a pumping device 101 with an internal pressure chamber 21 and a pressure medium circulation device 102 connected to the pressure chamber 21 via a medium pipeline. The inlet of the pumping device 101 is connected to the outlet of the feed storage tank 20. The pressure chamber 21 has an elastic diaphragm 3 embedded in its cavity wall.

[0048] The discharge storage tank 30 is constructed such that the internal pressure is maintained at a second pressure, which is greater than the first pressure, and the inlet of the discharge storage tank 30 is connected to the outlet of the pumping device 101.

[0049] The diaphragm 3 can be recessed inward to form a receiving space 31 for receiving powder when the pressure chamber 21 is depressurized, and the diaphragm 3 can be bulged outward to compress the receiving space 31 when the pressure chamber 21 is pressurized, so as to pressurize the powder by squeezing and match the second pressure.

[0050] Specifically, the overall structure of the powder pressurized conveying system is shown in the attached diagram. Figure 1 As shown, it includes three main parts: a feed tank 20, a pressurized pumping system 10, and a discharge tank 30. The feed tank 20 is located on the low-pressure side and is directly connected to a powder source at atmospheric pressure. The feed tank 20 maintains a first pressure not lower than atmospheric pressure. The discharge tank 30 is located on the high-pressure side and maintains a second pressure higher than the first pressure. The pressurized pumping system 10 is used to pressurize the powder on the low-pressure side and transport it to the high-pressure side.

[0051] The pressurized pumping system 10 mainly consists of a pumping device 101 and a pressure medium circulation device 102. The pumping device 101 has an internal pressure chamber 21, which is constructed within a rotatable pump core component. An opening 23 is formed in the wall of the pressure chamber 21, and an elastic diaphragm 3 is embedded within the opening 23, forming part of the chamber wall. The pressure medium circulation device 102 is connected to the pressure chamber 21 via a medium pipeline, enabling the pressurization and depressurization of the pressure chamber 21 by either introducing or discharging the pressurized medium from the pressure chamber 21. When the pressure chamber 21 is depressurized, the internal and external pressure difference causes the diaphragm 3 to indent inward, forming a receiving space 31. When the receiving space 31 corresponds to the feed tank 20, it can accommodate part of the powder conveyed from the feed tank 20. When the pressure chamber 21 is pressurized, the internal and external pressure difference causes the diaphragm 3 to bulge outward, compressing the previously formed receiving space 31. Thus, when the receiving space 31 rotates with the pump core component to a position opposite to the material direction of the feed tank 20, the diaphragm 3 can cooperate with the inner wall of the pumping device 101 under the pressurization of the pressure chamber 21 to squeeze the powder in the receiving space 31, thereby pressurizing the powder and matching its pressure to the pressure on the high-pressure side. When the receiving space 31 rotates with the pump core component to a position corresponding to the discharge tank 30, the diaphragm 3 can bulge further and completely eliminate the receiving space 31, allowing the pressurized powder to be sent into the discharge tank 30.

[0052] The powder pressurization and conveying system of the present invention utilizes the deformation of the diaphragm 3 structure of the pumping device 101 to achieve pressurization and conveying of powder. The conveying system does not require the large-scale pressurization and depressurization equipment required by the prior art. The equipment volume of the entire conveying system is greatly reduced and the process flow is greatly simplified. Moreover, the entire conveying system does not require any valve components in its structure, avoiding the problem of valve wear and blockage that leads to frequent maintenance of the conveying system.

[0053] In one embodiment, the feed tank 20 and the discharge tank 30 are respectively connected to a first gas source 40 and a second gas source 50 via pipelines. The first gas source 40 and the second gas source 50 are used to deliver pressurized gas with pressure matching the first pressure and the second pressure to the feed tank 20 and the discharge tank 30, respectively.

[0054] Specifically, as shown in the attached diagram. Figure 1 As shown, the feed tank 20 and the discharge tank 30 are supplied with gas by the first gas source 40 and the second gas source 50, respectively, to maintain the internal pressure environment of the tanks using gas pressure. Preferably, the gases supplied by the first gas source 40 and the second gas source 50 are chemically stable gases. In this embodiment, preferably, the pressurized gas supplied by the first gas source 40 is nitrogen, and the pressurized gas supplied by the second gas source 50 is either nitrogen or carbon dioxide.

[0055] In one embodiment, a first activation conveyor 60 and a second activation conveyor 70 are respectively provided between the feed storage tank 20 and the pumping device 101 and at the outlet end of the discharge storage tank 30. The first air source 40 and the second air source 50 are respectively connected to the first activation conveyor 60 and the second activation conveyor 70 through branch pipelines.

[0056] Specifically, as shown in the attached diagram. Figure 1 As shown, activation conveyors are installed at corresponding positions in the conveying system. The first activation conveyor 60, in conjunction with the gas input from the first gas source 40, forms an airflow to activate and convey the powder in the feed storage tank 20, so that it is evenly fed into the pumping device 101. The second activation conveyor 70, in conjunction with the gas input from the second gas source 50, forms an airflow to activate and convey the powder in the discharge storage tank 30, and sends it into the downstream equipment.

[0057] In one embodiment, the system further includes a powder filter 80 connected to the feed tank 20 and the discharge tank 30 via pipelines. The powder filter 80 is provided with a gas vent and a powder recovery port connected to the feed tank 20.

[0058] Specifically, as shown in the attached diagram. Figure 1 As shown, the activated airflow formed at the feed tank 20 and the discharge tank 30 by the first air source 40 and the second air source 50 needs to be discharged through the pipeline, thus forming a continuously flowing airflow. This part of the airflow is led to the powder filter 80 through the pipeline for powder filtration. The filtered gas is released into the atmosphere, and the filtered powder is reintroduced into the feed tank 20 through the pipeline for recycling.

[0059] In one embodiment, the pressure medium circulation device 102 in the pressurized pumping system 10 adopts a hydraulic circulation system, which has a simple structure and is based on a pressurized liquid closed circulation. The pressure medium circulation device 102 emits no exhaust gas during operation and has relatively low energy consumption. (See attached figures) Figure 2 As shown, the hydraulic circulation system is connected to the pumping device 101 through a medium pipeline. A medium pump 103 is installed on the medium pipeline corresponding to the outlet of the hydraulic circulation system. The medium pipeline corresponding to the outlet of the hydraulic circulation system is connected to the medium pipeline corresponding to the inlet of the hydraulic circulation system through a branch. A pressure regulating valve 104 is installed on this branch. The pressure regulating valve 104 is used to control the hydraulic pressure on the branch so that the hydraulic pressure after the medium on the branch is mixed with the medium in the medium pipeline corresponding to the inlet of the hydraulic circulation system can be controlled within a set range.

[0060] In one embodiment, the pumping device 101 includes:

[0061] The outer casing 1 has an inlet 11, a pumping chamber 12, and an outlet 13 sequentially distributed along a first direction; and

[0062] Impeller 2 (i.e. pump core component) is constructed as a rotating shell structure filled in the pumping chamber 12. The axis of the rotating shell structure is orthogonal to the first direction. Impeller 2 is constructed to rotate around the axis of the rotating shell structure. Pressure chamber 21 is constructed inside impeller 2. Diaphragm 3 is embedded in the shell of impeller 2.

[0063] Preferably, the impeller 2 has multiple pressure chambers 21 with uniform volume inside, and each pressure chamber 21 corresponds to a diaphragm 3. Each pressure chamber 21 and each diaphragm 3 are distributed along the rotation direction of the impeller 2.

[0064] Specifically, as shown in the attached diagram. Figure 3 and Figure 4 As shown, the powder pressurized pumping device 101 of the present invention mainly includes two parts: a housing 1 and an impeller 2. The housing 1 has an overall cylindrical structure, with an inlet 11 and an outlet 13 at each end, and a pumping chamber 12 in the middle. The inlet 11 and outlet 13 are connected to the pumping chamber 12 through corresponding inlet and outlet channels. The impeller 2 is disposed in the pumping chamber 12. The impeller 2 has an overall rotating shell structure and fills the pumping chamber 12; that is, the internal space of the pumping chamber 12 is also a rotating body, such as a sphere or cylinder. The impeller 2 rotates around the axis of the rotating shell structure, and this axis is orthogonal to the axis of the housing 1 (i.e., the first direction), as shown in the attached figure. Figure 3 and Figure 4 Since the first direction corresponding to the outer casing 1 is the vertical direction, the rotation axis of the impeller 2 is along the horizontal direction. The impeller 2 has at least one (two in this embodiment) pressure chamber 21 internally. Each pressure chamber 21 is connected to a pressure medium circulation device 102 (not shown in the attached figure) via a pipeline. The pressure medium circulation device 102 can supply pressure medium to the pressure chamber 21 or output pressure medium from the pressure chamber 21 through the pipeline, thereby changing the pressure in the pressure chamber 21 and realizing pressure boosting and depressurization. The ultimate purpose of this pressure boosting and depressurization is to cooperate with the further structural design of the impeller 2 to achieve pressurized conveying of powder, specifically:

[0065] As shown in the attached figure. Figures 3 to 5As shown, the impeller 2 has one or more openings 23 on its shell (the number of openings 23 matches the number of pressure chambers 21). These openings 23 are distributed sequentially along the rotation direction of the impeller 2, and each opening 23 corresponds one-to-one with each pressure chamber 21. An elastic diaphragm 3 is embedded in each opening 23, and the diaphragm 3 cooperates with the impeller 2 shell to seal the corresponding pressure chamber 21. Since the diaphragm 3 is an elastic structure and the impeller 2 shell is a rigid structure (in this embodiment, the impeller 2 shell is a metal structure), the diaphragm 3 will deform accordingly as the pressure chamber 21 is pressurized and depressurized. Specifically, when the pressure chamber 21 is depressurized, under the action of the internal and external pressure difference, the diaphragm 3 will be recessed into the impeller 2, thereby forming a groove-shaped receiving space 31 at the diaphragm 3; when the pressure chamber 21 is pressurized, under the action of the internal and external pressure difference, the diaphragm 3 will bulge outwards from the impeller 2, thereby compressing the receiving space 31 formed when it is recessed. When there is powder inside the receiving space 31, the diaphragm 3 can compress the powder, thereby pressurizing it. The following will further elaborate on this with reference to the actual conveying process:

[0066] Based on the aforementioned distribution of openings 23 along the rotation direction of the impeller 2, and the corresponding positions of the openings 23 on the impeller 2's axis of rotation to the inlet 11 and outlet 13, the diaphragm 3 positioned at the openings 23 will sequentially pass through the inlet 11 and outlet 13 as the impeller 2 rotates, thereby conveying the powder. (Refer to the attached drawings.) Figure 3 and Figure 4The outer shell 1 is vertically arranged, with the inlet 11 at the top and the outlet 13 at the bottom. The specific process of powder conveying is as follows: when the diaphragm 3 rotates with the impeller 2 to the corresponding upper inlet 11, the corresponding pressure chamber 21 is depressurized by the pressure medium circulation device 102. At this time, the diaphragm 3 is recessed into the pressure chamber 21 inside the impeller 2 under the action of the external atmospheric pressure, forming a receiving space 31. At this time, the powder input from the inlet 11 falls into the receiving space 31 under the action of gravity. Then, the diaphragm 3, which receives the material, rotates towards the discharge port 13 along with the impeller 2. When it rotates to the point where it is completely offset from the inlet 11, the receiving space 31 is surrounded by the diaphragm 3 and the cavity wall of the pumping chamber 12. At this time, the pressure medium circulation device 102 inputs pressure medium into the pressure chamber 21 to pressurize it. As the pressure chamber 21 is pressurized, the diaphragm 3 tends to bulge outwards from the impeller 2, that is, the diaphragm 3 deforms in the direction of compressing the receiving space 31. Since the receiving space 31 carries material, the diaphragm 3 cooperates with the cavity wall of the pumping chamber 12 to jointly squeeze the material in the receiving space 31, thereby pressurizing the material. Finally, as the impeller 2 rotates further, the diaphragm 3 gradually corresponds to the discharge port 13 below. The material in the receiving space 31 is completely squeezed out and falls downwards to the discharge port 13, eventually entering the high-pressure powder container corresponding to the discharge port 13. Afterward, the diaphragm 3 rotates back from the discharge port 13 to the inlet 11 for the next pressurized conveying process. In a pressurized conveying process, multiple pressure chambers 21 and multiple corresponding diaphragms 3 can be set up so that the diaphragms 3 corresponding to different pressure chambers 21 can simultaneously convey multiple portions of powder. For example, when one diaphragm 3 receives the powder by forming a receiving space 31 at the corresponding inlet 11, another diaphragm 3 can pressurize the powder by corresponding to the wall of the pumping chamber 12 or discharge the powder by corresponding to the discharge port 13.

[0067] In addition, it should be noted that the outlet 13 and the inlet 11 of the outer casing 1 have different pressure environments on both sides. The inlet 11 side is a relatively low-pressure environment, and the outlet 13 side is a relatively high-pressure environment. The pressurized conveying device is used to pressurize the powder, so that the powder is conveyed from the low-pressure side to the high-pressure side, and the pressure of the powder is matched with the high-pressure environment on the outlet 13 side.

[0068] Preferably, the impeller 2 has multiple pressure chambers 21 internally, distributed along the rotation direction of the impeller 2. These multiple pressure chambers 21 can simultaneously pressurize and convey materials, improving working efficiency. The distribution of the pressure chambers 21 along the rotation direction of the impeller 2 ensures that the pressure chambers 21 and their corresponding diaphragms 3 can sequentially pass through the inlet 11 and outlet 13. Furthermore, this preference refers to the fact that each pressure chamber 21 is strictly distributed along the rotation direction of the impeller 2, meaning that the partition surface between adjacent pressure chambers 21 is parallel to the axis of rotation of the impeller 2. Of course, the partition surface between adjacent pressure chambers 21 can also be slightly inclined relative to the axis of rotation of the impeller 2, for example, having an angle of no more than 30° between the partition surface and the axis of rotation, so that the pressure chambers 21 are still generally distributed along the rotation direction of the impeller 2.

[0069] In one embodiment, short shafts 4 serving as the rotating shafts of impeller 2 are respectively constructed on opposite sides of impeller 2. The short shafts 4 penetrate the housing and at least one short shaft 4 is connected to a power mechanism for driving impeller 2. At least one short shaft 4 is constructed as a hollow shaft, and the interior of the hollow shaft is constructed with a medium channel 41 that corresponds to and communicates with each pressure chamber 21. The pressure chamber 21 is constructed to be connected to a medium pipeline through the medium channel 41.

[0070] Specifically, as shown in the attached diagram. Figure 4 and Figure 5 As shown, short shafts 4 extend from both sides of the impeller 2. These two short shafts 4 penetrate the outer casing 1, providing support for the impeller 2 and serving as rotational coupling components between the impeller 2 and the outer casing 1. At least one of the short shafts 4 is connected to a power mechanism (not shown in the figures) for driving the impeller 2. In this embodiment, the power mechanism is a motor drive system (with corresponding reducers and other components). The output end of the motor drive system can be connected to the short shaft 4 via a coupling, gear transmission mechanism, or other means. Furthermore, at least one of the short shafts 4 is structurally constructed as a hollow shaft. The internal space of this hollow shaft contains one or more medium channels 41 corresponding to each pressure chamber 21. The corresponding medium pipelines are connected to the corresponding pressure chambers 21 through the medium channels 41. This allows the medium pipelines to connect to the hollow shaft only outside the outer casing 1, without entering the interior of the outer casing 1, facilitating the layout of the medium pipelines.

[0071] Furthermore, in this embodiment, for the hollow shaft with multiple media channels 41, based on the existing structure, the way to keep the media pipeline connected to the hollow shaft while it is rotating can be as follows: the multiple media channels 41 inside the hollow shaft are constructed as concentric circles, that is, different media channels 41 are nested in the radial direction, and the internal structure of the media pipeline is constructed as a concentric circle structure identical to the media channels 41, thereby forming multiple pipeline channels corresponding one-to-one with the multiple media channels 41; and the port of the media pipeline is connected to the end face of the hollow shaft, while maintaining relative rotation and sealing connection between them. Correspondingly, the hollow shaft can be fitted with gears, and the gear transmission mechanism can be used to drive the output end of the motor drive system.

[0072] In one embodiment, an outer sleeve 5 is fitted onto the portion of the hollow shaft outside the housing. One end of the outer sleeve 5 is fixed to the outer wall of the housing 1. The outer sleeve 5 has an interface connected to the medium pipeline. The interface includes an input interface 52 and an output interface 51 that are offset in the circumferential direction of the outer sleeve 5. A plurality of medium channels 41 are distributed along the circumferential direction of the hollow shaft. A plurality of through holes are opened on the hollow shaft, which are distributed in the circumferential direction and correspond one-to-one with each medium channel 41. The through holes can correspond to the input interface 52 and the output interface 51 as the impeller 2 rotates, so as to pressurize and depressurize the corresponding pressure chamber 21 respectively.

[0073] Specifically, in this embodiment, some structural designs are added to the hollow shaft to connect the medium pipeline and the medium channel 41 in another way. (See attached diagram.) Figure 4 and Figure 7 As shown, the hollow shaft is fitted with an outer sleeve 5, one end of which is fixed to the outer wall of the outer casing 1, maintaining a seal between the hollow shaft and the outer sleeve 5. The outer sleeve 5 has interfaces for connecting to the media pipeline, including an input interface 52 and an output interface 51 offset circumferentially. The input and output pipelines in the media pipeline are respectively connected to the input interface 52 and the output interface 51. The media channels 41 inside the hollow shaft are circumferentially distributed, and each media channel 41 on the hollow shaft has a through hole (not shown in the attached figure) corresponding to it. The through hole communicates with the corresponding media channel 41 radially. When the hollow shaft and impeller 2 rotate as a whole, the corresponding through hole can rotate to correspond to the input interface 52 and the output interface 51. When corresponding to the input interface 52, the pressure medium can enter the corresponding pressure chamber 21 for pressurization; when corresponding to the output interface 51, the pressure medium can exit from the corresponding pressure chamber 21 for depressurization. In this embodiment, multiple media channels 41 share the same input interface 52 and output interface 51 for pressurization and depressurization. As the impeller 2 rotates to different angles, the corresponding media channels 41 are connected to the input interface 52 or the output interface 51 through through holes.

[0074] Compared to the previous embodiment, the structural design of this embodiment further simplifies the structure of the medium pipeline and the connection method between it and the hollow shaft. Furthermore, in this embodiment, the end of the hollow shaft is closed, allowing it to be directly extended outwards from the outer sleeve 5 using a coupling to achieve a transmission connection with the motor drive system.

[0075] Preferably, the output end of the pressure medium circulation device 102 is connected to the input interface 52 through the input pipeline in the medium pipeline, and the input end of the pressure medium circulation device 102 is connected to the output interface 51 through the output pipeline in the medium pipeline, so as to realize the closed circulation of the pressure medium.

[0076] In one embodiment, a short shaft 4 is constructed as a hollow shaft, and the input interface 52 and the output interface 51 are constructed in the same outer sleeve 5. The input interface 52 and the output interface 51 are positioned axially in the outer sleeve 5 and correspond to the through holes on the hollow shaft.

[0077] Specifically, based on the previous embodiment, in this embodiment, only one short shaft 4 is constructed as a hollow shaft. The input interface 52 and the output interface 51 are both set on the outer sleeve 5 corresponding to the hollow shaft. The axial position of the through hole on the hollow shaft corresponds to the axial position of the input interface 52 and the output interface 51. When the hollow shaft rotates to the output interface 51 corresponding to the through hole of a certain medium channel 41, the diaphragm 3 of the corresponding pressure chamber 21 corresponds to the feed port 11. The pressure medium in the pressure chamber 21 is discharged through the output interface 51, causing the diaphragm 3 to be concave to form a receiving space 31. Then, when the hollow shaft rotates to a certain angle, the receiving space 31 is completely offset from the feed port 11 and completely corresponds to the cavity wall of the pumping chamber 12. At this time, the through hole of the medium channel 41 corresponding to the pressure chamber 21 corresponds to the input interface 52. The pressure medium is input through the input interface 52 to pressurize the pressure chamber 21 and pressurize the powder in the receiving space 31. Finally, the receiving space 31 rotates further beyond the feed port 13, and the corresponding through hole is offset from the input interface 52. The receiving space 31 at least partially corresponds to the discharge port 13, so that the pressure of the pressurized pressure chamber 21 forces the diaphragm 3 to bulge completely outward and completely squeeze out all the material in the receiving space 31. In this embodiment, one pressure chamber 21 corresponds to only one medium channel 41, and the pressure chamber 21 is used for both pressurization and depressurization through the through hole of the medium channel 41.

[0078] In one embodiment, both short shafts 4 are constructed as hollow shafts, with an input interface 52 constructed in one of the outer sleeves 5 and an output interface 51 constructed in the other outer sleeve 5. The positions of the input interface 52 and the output interface 51 in the axial direction of the corresponding outer sleeves 5 correspond to the through holes on the corresponding hollow shafts.

[0079] Specifically, in this embodiment, both short shafts 4 are constructed as hollow shafts, as shown in the attached figure. Figure 4As shown, the input interface 52 and the output interface 51 are respectively located on the two outer sleeves 5 corresponding to the two hollow shafts. The axial position of the through hole on the hollow shaft corresponds to the input interface 52 or the output interface 51 on the outer sleeve 5 corresponding to the hollow shaft. In this embodiment, one pressure chamber 21 corresponds to two medium channels 41. The two through holes respectively provided on the two medium channels 41 are used for pressurization and depressurization of the pressure chamber 21, and the two through holes are aligned in the circumferential direction of the hollow shaft. This ensures that when one through hole corresponds to the input interface 52, the other through hole is offset from the output interface 51, guaranteeing that the pressure chamber 21 only pressurizes or depressurizes at the same time. The process of pressurization and depressurization of the pressure chamber 21 in conjunction with powder conveying is described in the previous embodiment and will not be repeated in this embodiment.

[0080] In one embodiment, the impeller 2 is provided with a baffle 22 for separating multiple pressure chambers 21. The side edge of the baffle 22 corresponds to the corresponding hollow shaft and extends into the hollow shaft to separate multiple medium channels 41 within the hollow shaft.

[0081] Specifically, as shown in the attached diagram. Figure 6 As shown, the impeller 2 and the hollow shaft are separated into corresponding pressure chambers 21 and medium channels 41 by the same partition 22. In this embodiment, the partition 22 is a flat plate that coincides with the rotation axis of the impeller 2, dividing the impeller 2 and the hollow shaft into two pressure chambers 21 and two medium channels 41. The structure of the partition 22 can also be adjusted according to the required number of pressure chambers 21 and medium channels 41. For example, a cross-shaped partition 22 can be used to divide the impeller 2 and the hollow shaft into four pressure chambers 21 and four medium channels 41.

[0082] Preferably, the internal space of the impeller 2 is uniformly divided into multiple pressure chambers 21. This ensures that, under the same pressurization and depressurization process parameters, the pressure change of each pressure chamber 21 is consistent, which is beneficial to ensure the uniformity and consistency of the conveying volume and pressurization degree of each powder when using the diaphragm 3 of different pressure chambers 21 to convey powder.

[0083] In one embodiment, the pumping chamber 12 is configured as a spherical cavity, the impeller 2 is configured as a spherical shell structure, and the diaphragm 3 is configured as a spherical structure that can bulge outward to maintain the same radius of curvature as the spherical surface of the impeller 2.

[0084] Specifically, as shown in the attached diagram. Figures 3 to 6As shown, the pumping chamber 12 and impeller 2 are preferably constructed as a spherical structure. The advantages of using a spherical structure are: the spherical surface extends continuously and smoothly, so that there are no dead corners between the impeller 2 and the pumping chamber 12, avoiding the problem that powder may enter between the impeller 2 and the pumping chamber 12 and accumulate in the dead corners; based on the spherical structure of the impeller 2, by designing the specific material and elastic coefficient of the diaphragm 3 and combining the design of the pressurization and depressurization process parameters, the diaphragm 3 can be made to have the same radius of curvature as the spherical surface of the impeller 2 when it is fully bulging at the corresponding discharge port 13, that is, as part of the spherical surface. This can completely compress and eliminate the receiving space 31 formed when the diaphragm 3 is concave, so that the diaphragm 3 can fit against the inner wall of the pumping chamber 12 when it turns from the discharge port 13 to the inlet 11, thereby preventing the gas in the high-pressure environment on the discharge port 13 side from entering the low-pressure environment on the inlet 11 side due to the residual receiving space 31 after incomplete compression, and avoiding changes in the environmental pressure difference between the discharge port 13 and the inlet 11.

[0085] Furthermore, the spherical impeller 2 and pumping chamber 12 have the advantage of utilizing the continuous and smooth extension of the spherical surface, which allows the outer spherical surface of the impeller 2 to be in close contact with the inner spherical surface of the pumping chamber 12. When the impeller 2 rotates, the edge of the connection port 121, which connects one end of the feed channel and the discharge channel corresponding to the feed port 11 and the discharge port 13 to the pumping chamber 12, has a scraping effect on the surface of the impeller 2, thereby scraping off the powder adhering to the surface of the impeller 2 and preventing the powder from entering between the impeller 2 and the pumping chamber 12, thus avoiding the erosion of the outer wall of the impeller 2 and the inner wall of the pumping chamber 12 by the powder.

[0086] In one embodiment, the pumping chamber 12 is configured with connection ports 121 corresponding to the feed inlet 11 and the discharge outlet 13 respectively, and a sealing gasket 6 is provided at the edge of the connection port 121 to seal against the outer surface of the impeller 2.

[0087] Specifically, as shown in the attached diagram. Figure 5 As shown, the connection port 121 is the part where one end of the feed channel and the discharge channel corresponding to the feed port 11 and the discharge port 13 are connected to the pumping chamber 12. A sealing gasket 6 is provided at the connection port 121, which can enhance the sealing at the connection port 121 and the scraping effect of the edge of the connection port 121 on the powder adhering to the outer wall of the impeller 2, further reducing the possibility of powder entering between the impeller 2 and the pumping chamber 12. In addition, by enhancing the sealing, it can prevent the high-pressure environment gas on the discharge port 13 side from flowing into the low-pressure environment on the feed port 11 side through the space between the impeller 2 and the pumping chamber 12.

[0088] An embodiment of the present invention provides a method for pressurizing and conveying powder, which is applied to the above-mentioned powder pressurizing and conveying system. The conveying method includes the following steps:

[0089] The pressure chamber 21 inside the pumping device 101 is depressurized by the pressure medium circulation device 102, so that the diaphragm 3 corresponding to the pressure chamber 21 is recessed inward to form a receiving space 31 corresponding to the material receiving direction of the feed storage tank 20. The receiving space 31 is used to accommodate the powder falling from the feed storage tank 20 into the pumping device 101.

[0090] Start the power unit connected to the pumping device 101, drive the impeller 2 in the pressure chamber 21 to rotate to the receiving space 31 so that it is offset from the incoming material direction and corresponds to the inner wall of the pumping device 101.

[0091] The pressure chamber 21 is pressurized by the pressure medium circulation device 102, causing the diaphragm 3 to bulge outward and compress the receiving space 31, and together with the inner wall of the pumping device 101, the powder in the receiving space 31 is squeezed.

[0092] Start the power unit and drive the impeller 2 to rotate so that the discharge direction of the receiving space 31 and the discharge storage tank 30 are aligned, so that the diaphragm 3 bulges outward and forces the powder in the receiving space 31 to fall into the discharge storage tank 30.

[0093] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0094] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other embodiments.

Claims

1. A powder pressurized conveying system, characterized in that, include: The feed storage tank is constructed such that the internal pressure is maintained at a primary pressure. A pressurized pumping system includes a pumping device with an internal pressure chamber and a pressure medium circulation device connected to the pressure chamber via a medium pipeline. The inlet of the pumping device is connected to the outlet of the feed tank, and the pressure chamber has an elastic diaphragm embedded in its cavity wall. as well as The discharge storage tank is constructed such that the internal pressure is maintained at a second pressure, which is greater than the first pressure, and the inlet of the discharge storage tank is connected to the outlet of the pumping device. The diaphragm can be recessed to form a receiving space for receiving powder when the pressure chamber is depressurized, and the diaphragm can be bulged outward to compress the receiving space when the pressure chamber is pressurized, so as to pressurize the powder by squeezing to match the second pressure.

2. The powder pressurized conveying system according to claim 1, characterized in that, The feed tank and the discharge tank are respectively connected to a first gas source and a second gas source via pipelines. The first gas source and the second gas source are used to deliver pressurized gas with pressure matching the first pressure and the second pressure to the feed tank and the discharge tank, respectively.

3. The powder pressurized conveying system according to claim 2, characterized in that, A first activation conveyor and a second activation conveyor are respectively provided between the feed tank and the pumping device and at the outlet end of the discharge tank. The first gas source and the second gas source are respectively connected to the first activation conveyor and the second activation conveyor through branch pipelines.

4. The powder pressurized conveying system according to claim 3, characterized in that, It also includes a powder filter that is connected to the feed tank and the discharge tank respectively by pipelines. The powder filter is provided with a gas vent and a powder recovery port connected to the feed tank.

5. The powder pressurized conveying system according to claim 2, characterized in that, The first gas source delivers nitrogen gas, and the second gas source delivers either nitrogen gas or carbon dioxide gas.

6. The powder pressurized conveying system according to claim 1, characterized in that, The pumping device includes: The outer casing has an inlet, a pumping chamber, and an outlet sequentially distributed along a first direction; and The impeller is constructed as a rotating housing structure filled within the pumping chamber, the axis of the rotating housing structure being orthogonal to the first direction, the impeller being constructed to rotate about the axis of the rotating housing structure, the pressure chamber being constructed inside the impeller, and the diaphragm being embedded in the housing of the impeller.

7. The powder pressurized conveying system according to claim 6, characterized in that, The impeller has multiple pressure chambers with uniform volume inside, and each pressure chamber corresponds to a diaphragm. Each pressure chamber and each diaphragm are distributed along the rotation direction of the impeller.

8. The powder pressurized conveying system according to claim 6 or 7, characterized in that, The impeller has short shafts on opposite sides, which serve as the impeller shafts. The short shafts pass through the housing and at least one of the short shafts is connected to a power mechanism for driving the impeller. Wherein, at least one of the short shafts is constructed as a hollow shaft, and the interior of the hollow shaft is divided into a plurality of medium channels that correspond one-to-one with each of the pressure chambers, and the pressure chambers are constructed to connect to the medium pipelines through the medium channels.

9. The powder pressurized conveying system according to claim 3, characterized in that, The hollow shaft is fitted with an outer sleeve on the portion outside the housing. One end of the outer sleeve is fixed to the outer wall of the housing. The outer sleeve has an interface connected to the medium pipeline. The interface includes an input interface and an output interface that are offset from each other in the circumferential direction of the outer sleeve. The plurality of medium channels are distributed circumferentially along the hollow shaft, and the hollow shaft is provided with a plurality of through holes distributed circumferentially and corresponding one-to-one with each of the medium channels. The through holes can correspond to the input interface and the output interface as the impeller rotates, so as to pressurize and depressurize the corresponding pressure chambers respectively.

10. The powder pressurized conveying system according to claim 6, characterized in that, The pumping chamber is constructed as a spherical cavity, the impeller is constructed as a spherical shell structure, and the diaphragm is constructed as a spherical structure whose radius of curvature is consistent with that of the impeller spherical surface when it bulges outward.

11. A method for pressurized conveying of powder, characterized in that, The powder pressurized conveying system as described in any one of claims 1 to 10, the conveying method comprising the following steps: The pressure chamber inside the pumping device is depressurized by a pressure medium circulation device, causing the diaphragm corresponding to the pressure chamber to be recessed inward to form a receiving space corresponding to the material receiving direction of the feed tank. The receiving space is used to accommodate the powder falling from the feed tank into the pumping device. Start the power unit connected to the pumping device to drive the impeller where the pressure chamber is located to rotate to the receiving space, which is offset from the incoming material direction and corresponds to the inner wall of the pumping device; The pressure chamber is pressurized by the pressure medium circulation device, causing the diaphragm to bulge outward and compress the receiving space, and together with the inner wall of the pumping device, it squeezes the powder in the receiving space. Start the power unit to drive the impeller to rotate so that the discharge direction of the receiving space and the discharge tank corresponds to that of the discharge tank, so that the diaphragm bulges outward and forces the powder in the receiving space to fall into the discharge tank.

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