Explosion-proof powder storage equipment

Abstract

The utility model discloses explosion-proof powder storage equipment, which comprises a powder storage tank, a filter device, a first valve and a second valve, the filter device is arranged on the powder storage tank and comprises a shell and a filter element in the shell, and the first valve is arranged between the filter element and the powder storage tank and is configured to control the shell of the filter device to be communicated with or separated from the powder storage tank; the second valve is arranged on one side, far away from the powder storage tank, of the filter element, and is configured to control the communication or isolation of the shell of the filter device and the blowback air source; the volume of the filtering device is less than or equal to 200ml, and the powder storage equipment is not provided with an explosion-proof device or an explosion venting device; or, an explosion-proof device or an explosion venting device is arranged on the filter device larger than 200ml, and the powder storage tank is not provided with the explosion-proof device or the explosion venting device. According to the structure, in the reverse blowing stage, reverse blowing airflow does not carry powder on the filter element to float in the powder storage tank, the explosion risk of the powder is reduced, and the explosion-proof requirement that an explosion-proof valve or an explosion venting piece is allowed not to be installed is met.

Description

Technical Field

[0001] The utility model relates to the field of pneumatic conveying, in particular to an explosion-proof powder storage device. Background Art

[0002] Due to environmental requirements and the health of workers, etc., powder, especially micro-powder, is conveyed by pneumatic conveying to reduce dust pollution. The closed conveying method of the pneumatic conveying system can effectively prevent powder from flying, and at the same time can prevent water vapor, impurities, etc. from mixing into the material, and can also reduce labor costs and achieve high automation.

[0003] At present, a powder conveying tank is provided with a breather for balancing air flow, and a filter element is arranged inside it to adsorb powder to prevent it from flying outside the tank; over time, the filter element will be filled with powder, causing the air flow inside and outside the powder conveying tank to lose balance.

[0004] In order to reduce the frequency of replacing the filter element, a solution of backwashing the filter element after the feeding is completed is proposed. In the backwashing stage, the powder is mixed in the gas with a relatively large pressure and suspended in the upper space inside the tank; typically, an explosion-proof valve or a bursting disc needs to be arranged outside the powder storage tank or on the feeding pipeline to meet the explosion-proof requirements.

[0005] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the present application, and it does not necessarily belong to the prior art of the present application, nor will it necessarily give technical guidance; in the case where there is no clear evidence that the above content has been made public before the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an explosion-proof powder storage device that can be backwashed and explosion-proof without setting an explosion-proof valve or a bursting disc.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] An explosion-proof powder storage device, including a powder storage tank and a filtering device, wherein the filtering device is arranged on the powder storage tank, and the filtering device includes a housing and a filter element arranged inside the housing; the powder storage device further includes:

[0009] A first valve, which is arranged between the filter element and the powder storage tank, and is configured to control the communication or isolation between the housing of the filtering device and the powder storage tank;

[0010] A second valve, which is arranged on the side of the filter element away from the powder storage tank, and is configured to control the communication or isolation between the housing of the filtering device and the backwashing air source;

[0011] The volume of the filtering device is less than or equal to 200 ml, and the powder storage device is not provided with an explosion-proof device or a pressure relief device; or, the volume of the filtering device is greater than 200 ml, the powder storage tank is not provided with an explosion-proof device or a pressure relief device, and the filtering device is provided with an explosion-proof device or a pressure relief device; or, the number of the filtering devices is multiple, and the volume of each filtering device does not exceed 200 ml, and the powder storage device is not provided with an explosion-proof device or a pressure relief device; or, the number of the filtering devices is multiple, the volume of some or all of the filtering devices exceeds 200 ml, the powder storage tank is not provided with an explosion-proof device or a pressure relief device, and the filtering devices with a volume exceeding 200 ml are provided with an explosion-proof device or a pressure relief device.

[0012] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the powder storage tank includes a tank body and a tank cover, and the filtering device is arranged on the tank cover;

[0013] And / or, at least one feed port is further arranged on the powder storage tank, and the powder storage device sucks the powder into the powder storage tank through the feed port by the principle of vacuum pumping.

[0014] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the second valve is arranged outside the filtering device, the inlet of the second valve is configured to be connected to the backflush air source, and its outlet is communicated with the housing through a blowpipe.

[0015] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the second valve is an electromagnetic pulse valve, and the duty cycle of the electromagnetic pulse valve is set according to the pre-sampled particle size of the powder; the first valve (310) is a pneumatic butterfly valve.

[0016] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the backflush air source is an air bag configured to store compressed gas, and the air bag is provided with an air inlet pipe and an air inlet valve arranged on the air inlet pipe.

[0017] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the air bag is further provided with an exhaust valve and / or a blowdown valve arranged at the bottom of the air bag.

[0018] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the powder storage device provided by the present utility model further includes a stirring device, and the stirring device includes a shaft rod, stirring blades arranged on the shaft rod, and a power mechanism for driving the shaft rod to rotate;

[0019] The shaft rod is arranged in the powder storage tank, and an opening is arranged on the powder storage tank, and the output shaft of the power mechanism is connected to the shaft rod in a linked manner through the opening.

[0020] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the filter element of the filtering device includes a proximal core body, an intermediate core body, and a distal core body, and the proximal core body is closer to the first valve than the distal core body;

[0021] The outer diameter of the filter element first contracts and then expands in the direction from the proximal core body to the intermediate core body, and generally contracts in the direction from the intermediate core body to the distal core body.

[0022] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the filter element (220) of the filtering device (200) has a cylindrical structure with a uniform outer diameter.

[0023] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the powder storage tank is a metering tank;

[0024] Alternatively, the powder storage tank is a feeding tank, and its bottom is connected to a feeding pipeline through a feeding valve.

[0025] The beneficial effects brought by the technical solutions provided by the present utility model are as follows:

[0026] a. By adding an electronically controllable valve between the powder storage tank and the filtering device, the backwashing air flow during the backwashing stage will not carry the powder on the filter element and float in the powder storage tank, reducing the risk of powder explosion and meeting the explosion-proof requirements that allow not installing an explosion isolation valve or a rupture disc;

[0027] b. By improving the structural design of the filter element, the probability of powder escaping is reduced, and at the same time, the effect of backwashing the filter element is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 A perspective view of a powder storage device provided for an exemplary embodiment of the present utility model;

[0030] Figure 2 A cross-sectional schematic view of a powder storage device provided for an exemplary embodiment of the present utility model;

[0031] Figure 3 A top view of a powder storage device provided for an exemplary embodiment of the present utility model;

[0032] Figure 4 Schematic diagram of the structure for connecting a backflush air source to a filtering device provided for an exemplary embodiment of the present utility model;

[0033] Figure 5 Schematic diagram of the filter element structure of a filtering device provided for an exemplary embodiment of the present utility model.

[0034] Among them, the reference numerals include: 100 - powder storage tank, 110 - tank body, 120 - tank cover, 130 - feed inlet, 200 - filtering device, 210 - housing, 220 - filter element, 222 - proximal core body, 224 - intermediate section core body, 226 - distal core body, 310 - first valve, 320 - second valve, 330 - feeding valve, 410 - backflush air source, 420 - injection pipe, 430 - intake pipeline, 440 - intake valve, 450 - exhaust valve, 460 - sewage discharge valve, 510 - shaft rod, 520 - power mechanism. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0037] In an embodiment of the present utility model, a powder storage device is provided. Refer to Figure 1 and Figure 2, the powder storage device includes a powder storage tank 100 and a filtering device 200. Among them, the filtering device 200 is arranged on the powder storage tank 100, and the filtering device 200 includes a housing 210 and a filter element 220 arranged inside the housing 210. The present invention does not limit that Figure 2 the filtering device 200 is vertically arranged on the upper end face of the powder storage tank 100 as shown, and it can also be inclined at a certain angle, or vertically arranged on the upper part of the side wall of the powder storage tank.

[0038] Taking the filtering device 200 being arranged on the upper end face of the powder storage tank 100 as an example, in a specific embodiment of the present invention, the powder storage tank 100 includes a tank body 110 and a tank cover 120. The tank body 110 is a container with an open upper end, and the tank cover 120 is covered on the open upper end of the tank body 110. As Figure 3 shown, at least one feed inlet 130 is further provided on the tank cover 120, and the powder storage device sucks the powder into the tank body 110 through the feed inlet 130 by the principle of vacuum pumping.

[0039] The filtering device 200 is arranged on the tank cover 120. As Figure 2 shown, the filtering device 200 can be vertically arranged on the tank cover 120.

[0040] The powder storage device further includes:

[0041] A first valve 310, which is arranged between the filter element 220 and the powder storage tank 100, and is configured to control the communication or isolation between the housing 210 of the filtering device 200 and the tank body 110;

[0042] A second valve 320, which is arranged on the side of the filter element 220 away from the powder storage tank 100, and is configured to control the communication or isolation between the housing 210 of the filtering device 200 and the backflush gas source 410;

[0043] In addition, the device further includes a feed valve (not shown) arranged at the feed inlet 130.

[0044] The powder storage device further includes a control module for controlling the first valve 310, the second valve 320, and the feed valve, and is configured to perform the following steps:

[0045] If the powder storage device is in the feeding stage, that is, the feed valve is in the open state under the control of the control module, then control the first valve 310 to open, and control the second valve 320 to close (that is, cut off the backflush gas source 410); at this time, the housing 210 of the filtering device 200 forms a communicating space with the tank body 110; see Figure 4, the upper end surface of the filtering device 200 is provided with a filter screen, so the filtering device 200 is also commonly known as a breathing tank, which is used to balance the internal and external air pressures of the powder storage tank 100; during the process of sucking the powder into the tank body 110 through the feed port 130, the filter element 220 of the filtering device 200 can adsorb the powder, that is, while achieving air flow balance, preventing the powder that should be stored in the tank body 110 from leaving the powder storage device. At this time, the backflush function of the device is turned off.

[0046] After the feeding stage of the powder storage device ends, control the first valve 310 to close, and after controlling the second valve 320 to open for a period of time, control the second valve 320 to close, and control the first valve 310 to open: that is, the control module responds to the instruction to stop feeding and controls the feeding valve to close, and then the backflush function of the device can be turned on. At this time, first close the first valve 310, and then open the second valve 320, that is, connect the backflush air source 410, and the powder adsorbed on the filter element 220 of the filtering module 200 can be blown off and fall onto the first valve 310 under the action of gravity. In one embodiment, a backflush timer is preset through a program, for example, it is set to control the second valve to close after backflushing for 30 seconds. In this case, opening the first valve 310 can make the powder accumulated on the first valve 310 fall into the tank body 110. Since the first valve 310 isolates the filtering device 200 from the powder storage tank 100 during the backflush process, the powder is only blown off inside the housing 210 of the filtering device 200, and dust explosion will not occur, improving the backflush safety of the powder storage device.

[0047] In a specific embodiment, the volume of the filtering device 200 is less than or equal to 200 ml; this volume meets the safety volume for explosion protection. Therefore, the powder storage device (powder storage tank 100 and filtering device 200) is allowed not to be provided with an explosion isolation device (such as an explosion isolation valve) or an explosion relief device (such as an explosion relief disk), nor does it need to be explosion-proof treated, greatly reducing the explosion-proof cost.

[0048] The required volume of the filtering device 200 is usually designed according to the size specification of the powder storage tank. If the required volume of the filtering device 200 exceeds 200 ml, such as 450 ml, then there are several ways as follows:

[0049] Method 1: Set a single filtering device 200 with a volume of 450 ml, and set an explosion isolation device or an explosion relief device on the filtering device 200, or perform explosion-proof treatment on it; while the powder storage tank 100 is not provided with an explosion isolation device or an explosion relief device, nor does it need to be explosion-proof treated;

[0050] Method 2: Set up three 150 ml filtering devices 200, and each filtering device 200 is correspondingly equipped with a backflush device. A first valve 310 is provided between the filter element 220 of each filtering device 200 and the powder storage tank 100. The powder storage equipment (powder storage tank 100 and filtering device 200) is not equipped with an explosion isolation device or explosion venting device, nor does it need to be explosion-proof treated;

[0051] Method 3: Set up a 200 ml first filtering device and a 250 ml second filtering device. An explosion isolation device or explosion venting device is provided on the second filtering device, or it is explosion-proof treated; while the powder storage tank 100 is not equipped with an explosion isolation device or explosion venting device, nor does it need to be explosion-proof treated.

[0052] In a specific embodiment, the second valve 320 is arranged outside the filtering device 200. The inlet of the second valve 320 is configured to be connected to the backflush gas source 410, and its outlet is communicated with the housing 210 through a blowpipe 420. As Figure 4 shown, the backflush gas source 410 is an air bag configured to store compressed gas. The air bag is provided with an intake pipeline 430 and an intake valve 440 arranged on the intake pipeline 430; further, the air bag can also be provided with an exhaust valve 450 and a drain valve 460 arranged at the bottom of the air bag.

[0053] When the backflush function is turned on, the second valve 320 and the intake valve 440 are opened, and the first valve 310, the exhaust valve 450, and the drain valve 460 are all closed; if the backflush function is not used for a long time, the gas in the air bag needs to be discharged. At this time, the exhaust valve 450 is opened, and the second valve 320, the intake valve 440, and the drain valve 460 are all closed; since compressed air usually contains moisture, the accumulated sewage can be drained away by opening the drain valve 460 while the second valve 320, the intake valve 440, and the exhaust valve 450 are all closed.

[0054] In a specific embodiment, the first valve 310 can be a pneumatic butterfly valve, and the second valve 320 is an electromagnetic pulse valve, specifically a right-angle electromagnetic pulse valve. The duty cycle of the electromagnetic pulse valve is set according to the pre-sampled powder particle size: if the average particle size of the powder is less than a certain threshold, such as less than or equal to 75 μm, then control the duty cycle of the electromagnetic pulse valve to be greater than or equal to 60%, which can effectively prevent too small powder from being secondarily adsorbed by the filter element 220 during backflush; if the average particle size of the powder is greater than a certain threshold, such as greater than or equal to 0.5 mm, then control the duty cycle of the electromagnetic pulse valve to be less than or equal to 20%, which can effectively extend the service life of the electromagnetic pulse valve; if the average particle size of the powder is between 75 μm and 0.5 mm, then the duty cycle is correspondingly set to be between 20% and 60%.

[0055] AsFigure 2 As shown in the figure, the powder storage device provided by the present utility model further includes a stirring device, and the stirring device includes a shaft rod 510, stirring blades arranged on the shaft rod 510, and a power mechanism 520 for driving the rotation of the shaft rod; the shaft rod 510 is arranged in the tank body 110, and an opening is provided on the tank cover 120, and the output shaft of the power mechanism 520 is connected to the shaft rod 510 in a linked manner through the opening. The stirring device is used to prevent the powder from agglomerating in the tank body 110 and blocking the feeding channel.

[0056] In one embodiment, the filter element 220 of the filtering device 200 is a columnar structure with the same outer diameter up and down.

[0057] In another embodiment, the structure of the filter element 220 of the filtering device 200 is further improved as Figure 5 shown: the filter element 220 is divided into three parts from bottom to top, namely a proximal core body 222, an intermediate core body 224, and a distal core body 226 (the three parts form an integral structure to form a filtering channel from bottom to top). The proximal core body 222 is closer to the first valve 310 than the distal core body 226;

[0058] The outer diameter of the filter element 220 shows a trend of first shrinking and then expanding in the direction from the proximal core body 222 to the intermediate core body 224, and its outer diameter shows a generally shrinking trend in the direction from the intermediate core body 224 to the distal core body 226. As Figure 5 shown, the height of the proximal core body 222 accounts for more than 50% of the overall height of the filter element 220, its outer diameter remains unchanged, and the internal filtering channel is also straight; the intermediate core body 224 is in a small-waist shape, and the distal core body 226 is slightly in an eight-shaped shape, and the internal filtering channel thereof matches the outer contour accordingly. Such a filter element design enables, on the one hand, when filtering the powder, most of the powder can be adsorbed by the proximal core body 222 relatively smoothly, and the upper part of the small-waist shape of the intermediate core body 224 and the eight-shaped structure of the distal core body 226 are used to hinder the powder from continuing to rise and separating from the filter element 220, reducing the risk of powder escape; on the other hand, during the backwashing process, the small-waist shape structure of the intermediate core body 224 is used to further increase the air pressure and the flow rate in the filtering channel of the proximal core body 222, so that when the air flow reaches the proximal core body 222 from top to bottom, it is easier to blow off the accumulated powder adhered to its surface, which can save the backwashing air flow and improve the backwashing efficiency.

[0059] The powder storage tank 100 in this embodiment can be a metering tank or a feeding tank, and its bottom is connected to the feeding pipeline through a feeding valve 330; the control module is further configured to perform the following control operations: when or before controlling the feeding valve 330 to open, control the first valve 310 to close, that is, when the control module responds to the feeding instruction, first close the first valve 310, and then open the feeding valve 330. Since the first valve 310 is closed, the tank body 110 is isolated from the filtering device 200. Therefore, during the feeding process, no gas will enter the tank body 110 through the housing 210 of the filtering device 200, eliminating the safety hazard of dust mixing with air and being explosive above the interior of the tank body 110.

[0060] The backwashing operation process of the explosion-proof powder storage device of the present invention after the feeding ends is as follows:

[0061] A first valve is added between the powder storage tank and the filtering device of the powder storage device, and it is configured to control the communication or isolation between the filtering device and the powder storage tank;

[0062] If the control module receives a feeding instruction, it controls the first valve to open and the backwashing device to close; then it opens the feeding valve to start feeding;

[0063] If the control module then receives a stop feeding instruction, it controls the feeding valve to close, that is, locates that the feeding has ended;

[0064] After the feeding ends, control the first valve to switch from the open state to the closed state, and control the backwashing device to switch from the closed state to the open state;

[0065] The backwashing device performs a gas blowing operation on the filter element in the filtering device, so that the powder on the filter element is blown off in the direction of the first valve;

[0066] After the backwashing ends (for example, when the backwashing timing reaches 30 s), the backwashing device closes, and the first valve is controlled to resume the open state.

[0067] For the embodiment where the powder storage tank is a feeding tank, the feeding operation process of the powder storage device is as follows:

[0068] If the control module receives a feeding instruction, it first controls the first valve to switch to the closed state, and then controls the feeding valve to open to make the feeding pipeline conductive.

[0069] It should be noted that the control method provided in this embodiment and the powder storage device provided in the above embodiment belong to the same concept. Therefore, the entire content of the powder storage device embodiment is incorporated into this control method embodiment by way of full reference, and will not be repeated here.

[0070] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0071] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An explosion-proof powder storage device, characterized in that: The invention comprises a powder storage tank (100) and a filter device (200), wherein the filter device (200) is arranged on the powder storage tank (100), and the filter device (200) comprises a housing (210) and a filter element (220) arranged inside the housing (210); the powder storage device further comprises: a first valve (310), which is disposed between the filter element (220) and the powder storage tank (100), and is configured to control the communication or isolation between the housing (210) of the filter device (200) and the powder storage tank (100); a second valve (320), which is arranged on a side of the filter element (220) away from the powder storage tank (100), and is configured to control the connection or isolation between the housing (210) of the filter device (200) and the back-blowing gas source (410); The volume of the filter device (200) is less than or equal to 200 ml, and the powder storage device is not provided with a flameproof device or a flameproof device; or, the volume of the filter device (200) is greater than 200 ml, and the powder storage tank (100) is not provided with a flameproof device or a flameproof device, and the filter device (200) is provided with a flameproof device or a flameproof device; or, there are a plurality of filter devices (200), and the volume of each filter device (200) does not exceed 200 ml, and the powder storage device is not provided with a flameproof device or a flameproof device; or, there are a plurality of filter devices (200), and the volume of some or all of the filter devices (200) exceeds 200 ml, and the powder storage tank (100) is not provided with a flameproof device or a flameproof device, and the filter device (200) exceeding 200 ml is provided with a flameproof device or a flameproof device.

2. The explosion-proof powder storage device according to claim 1, characterized in that: The powder storage tank (100) comprises a tank body (110) and a tank cover (120), and the filtering device (200) is arranged on the tank cover (120); And / or, the powder storage tank (100) is further provided with at least one feed port (130), and the powder storage device sucks the powder into the powder storage tank (100) through the feed port (130) by using a vacuum principle.

3. The explosion-proof powder storage device according to claim 1, characterized in that: The second valve (320) is arranged outside the filtering device (200), the inlet of the second valve (320) is configured to be connected to the back-blowing gas source (410), and the outlet thereof is connected to the housing (210) via a blowing pipe (420).

4. The explosion-proof powder storage device according to claim 1, characterized in that: The second valve (320) is an electromagnetic pulse valve, or the first valve (310) is a pneumatic butterfly valve.

5. The explosion-proof powder storage device according to claim 1, characterized in that: The back-blowing gas source (410) is an air bag configured to store compressed gas, and the air bag is provided with an air intake valve (440) for connecting to an air intake pipeline (430) and arranged on the air intake pipeline (430).

6. The explosion-proof powder storage device according to claim 5, characterized in that: The air bag is also provided with an exhaust valve (450) and / or a sewage discharge valve (460) arranged at the bottom of the air bag.

7. The explosion-proof powder storage device according to claim 1, characterized in that: Also included is a stirring device, the stirring device comprising a shaft (510), a stirring blade disposed on the shaft (510), and a power mechanism (520) for driving the shaft to rotate; The shaft (510) is disposed in the powder storage tank (100), and an opening is provided on the powder storage tank (100), and the output shaft of the power mechanism (520) is linked to the shaft (510) through the opening.

8. The explosion-proof powder storage device according to claim 1, characterized in that: The filter element (220) of the filter device (200) comprises a proximal core body (222), a middle core body (224) and a distal core body (226), wherein the proximal core body (222) is closer to the first valve (310) than the distal core body (226); The outer diameter of the filter element (220) shows a trend of first contraction and then expansion in the direction from the proximal core body (222) to the middle section core body (224), and its outer diameter shows a trend of roughly contraction in the direction from the middle section core body (224) to the distal core body (226).

9. The explosion-proof powder storage device according to claim 1, characterized in that: The filter element (220) of the filtering device (200) is a columnar structure with a uniform outer diameter.

10. The explosion-proof powder storage device according to any one of claims 1 to 9, characterized in that: The powder storage tank (100) is a metering tank; Alternatively, the powder storage tank (100) is a feeding tank, the bottom of which is connected to a feeding pipeline via a feeding valve (330).

Images