Overpressure protection device for dust collector and control method thereof

Abstract

This invention relates to the technical field of dust removal equipment and discloses an overpressure protection device and its control method for a dust collector. To solve the problem of abnormally increased internal pressure in a bag filter, a filter bag piston seat drives the filter bag body to move inside the dust collector housing. The filter bag piston seat can move up and down along the center of the dust collector housing. Under normal conditions, the filter bag piston seat is pushed downward by a spring. When the air pressure input below the filter bag piston seat is too high, the upward movement of the filter bag piston seat can relatively increase the actual filtration space below the filter bag piston seat, preventing the air pressure inside the dust collector housing from becoming abnormally high, and ultimately achieving the effect of overpressure buffer protection.

Description

Technical Field

[0001] This invention relates to the technical field of dust removal equipment, and in particular to an overpressure protection device and its control method for a dust collector. Background Technology

[0002] In industrial production and environmental protection, dust control is a crucial task, and baghouse dust collectors play a vital role. Baghouse dust collectors are high-performance, high-efficiency dry dust collection devices that overcome the drawbacks of traditional wet dust collectors, such as water pollution, by employing a unique dry treatment method. Their core working principle is based on a filtration mechanism, cleverly utilizing the precision filtration characteristics of fiber or inorganic fiber filter cloth to accurately intercept dust particles mixed in the gas. When dust-laden gas flows through the filter cloth, the dust particles are firmly adhered to the filter cloth surface due to gravity, inertial collision, interception, diffusion, and electrostatic adsorption, while the clean gas passes smoothly through the filter cloth, achieving gas-solid separation and thus purifying the gas.

[0003] According to the search, CN208642077U discloses a bag filter dust collector, which includes: dust-laden gas entering the bag filter dust collector from the air inlet, passing through a number of filter bags in sequence in the bag filter dust collector, and during the dust removal process through the filter bags, an air compressor can be started at regular intervals. The air compressor can deliver compressed air through a compressed air pipe to a number of jet nozzles to blow air onto the filter bags, so as to prevent dust accumulation and blockage of the filter bags.

[0004] It is clear from the technical solutions disclosed in the aforementioned patents that most common baghouse dust collectors on the market currently employ a method of backflushing the inside of the bags using an air compressor to clean the blockage when dealing with the common problem of full filter bags. This method is indeed effective to a certain extent in removing accumulated dust from the surface of the bags and maintaining their air permeability and filtration performance. However, in actual applications, baghouse dust collectors face more complex and variable operating conditions. When the pressure of the gas input into the dust collector suddenly increases, such as due to an upstream equipment malfunction causing a sudden increase in gas flow, or when local blockages occur inside the dust collector, such as some filter bags being damaged and causing dust to accumulate in a localized area, the internal pressure of the dust collector will increase sharply. Once the internal pressure of the dust collector becomes abnormally high, and if effective pressure relief is not carried out in a timely manner, it will lead to a series of serious consequences. Excessive pressure will exert a great squeezing effect on the filter bags, making them prone to rupture under continuous high pressure. Once the filter bags rupture, not only will the dust removal efficiency decrease significantly, but unfiltered dust will also be directly emitted into the atmosphere, causing environmental pollution. Summary of the Invention

[0005] This invention proposes an overpressure protection device and its control method for dust collectors, which has an overpressure protection function and aims to effectively solve the problem of abnormal pressure increase inside bag dust collectors mentioned in the background art, and provide a reliable guarantee for the safe and stable operation of bag dust collectors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an overpressure protection device for a dust collector, comprising: a dust collector housing, wherein dust-laden airflow enters from the inlet pipe at the bottom of the outer side of the dust collector housing, and after purification treatment is completed inside the dust collector housing, clean air is discharged from the outlet pipe at the top of the outer side; a protective cover, fixed to the top of the dust collector housing, wherein a protective piston is fitted inside the protective cover, and a detection center rod is installed at the upper and lower ends of the protective piston, and the protective piston is pushed downward by a spring installed at the top of the inner side of the protective cover; a bag piston seat, fitted inside the dust collector housing, wherein the top of the bag piston seat is threadedly connected to the bottom end of the detection center rod, and a support base is fixed to the bottom of the bag piston seat, and the bottom surface of the bag piston seat and the surface of the support base can install and limit the bag body through a bag mounting seat; when the airflow input from the inlet pipe increases abnormally, the bag piston seat will push the protective piston upward through the detection center rod, and at the same time squeeze the spring above the protective piston, thereby achieving elastic buffering.

[0007] Furthermore, a bag baffle is fixedly installed on the top of the inner cavity of the dust collector housing, and the bottom of the bag baffle is movably fitted with the support base, so that the bag baffle can support the outer part of the filter bag body.

[0008] Furthermore, a high-pressure air pipe is installed on the outside of the protective cover to introduce compressed air into the inner cavity below the protective piston; a rotating sleeve is movably fitted in the middle of the baffle frame using a positioning seat, and backflush holes are opened at equal angles around the outside of the rotating sleeve. An air blowing pipe connected to the backflush holes is fastened to the top of the rotating sleeve, and the top of the air blowing pipe passes through the top of the dust collector housing and is located in the inner cavity of the protective cover.

[0009] Furthermore, a detection cylinder that communicates with the inner cavity of the protective cover is fixedly connected to the top of the protective cover. A detection piston is fitted inside the detection cylinder. The detection piston is pushed downward by a spring installed at the top of the inner cavity of the detection cylinder. The inner side of the detection piston is movably fitted with the detection center rod above the protective piston. A spring push rod is movably installed inside the detection piston. The spring push rod can abut against the arc-shaped annular groove on the outer side of the top of the detection center rod.

[0010] Furthermore, a vent hole is provided on the surface of the piston.

[0011] Furthermore, detection elements are fixedly installed on the top of the outer side of the protective cover and the bottom of the outer side of the detection cylinder.

[0012] Furthermore, a rectangular groove communicating with the inner cavity is opened at the bottom outer side of the protective cover, and a leak-proof sleeve located below the protective piston is installed inside the protective cover, with a spring installed between the bottom of the leak-proof sleeve and the top of the dust removal housing.

[0013] Furthermore, an axial flow fan blade is clamped and fastened between the bottom of the air blowing pipe and the top of the rotating sleeve.

[0014] Furthermore, a leak-detecting rod is movably installed at the bottom of the rotating sleeve and is pushed outward by a spring. After the leak-detecting rod is pushed outward, the alarm whistle fixed on the side of the leak-detecting rod will be connected to the air blowing pipe, and the high-pressure airflow will blow through the alarm whistle to realize the sound alarm.

[0015] A control method for an overpressure protection device for a dust collector includes the following steps:

[0016] S1. The fan draws the dust-laden airflow from the bottom of the outer side of the dust collector housing into the inner cavity of the dust collector housing, providing the airflow to be treated for subsequent air purification.

[0017] S2. The air input into the inner cavity of the dust collector housing passes through the filter bag body, which filters impurities in the air to complete the air purification process and remove pollutants such as dust from the air.

[0018] S3. The air purified by the filter bag body is discharged from the air outlet pipe at the top of the outer side of the dust collector housing, realizing the output of purified air.

[0019] S4. When the filter bag body is blocked or the upstream equipment fails, causing a sudden increase in gas flow, which in turn causes a sudden increase in air pressure in the inner cavity of the dust collector housing, the filter bag piston seat tends to move upward.

[0020] S5. The upward-moving bag piston seat pushes the protective piston upward synchronously according to the detection center rod. The upward-moving protective piston overcomes the elastic force of the upper spring, so that the protective piston and the bag piston seat have an upward trend.

[0021] S6. After the filter bag piston seat moves upward, it increases the actual space below it and is located in the inner cavity of the dust collector housing to avoid the pressure in the inner cavity of the dust collector housing from continuously rising and causing overpressure damage to the filter bag body.

[0022] The present invention has the following beneficial effects:

[0023] This invention provides an overpressure protection device and its control method for a dust collector. Specifically, the filter bag body is movably arranged in the internal space of the dust collector housing via a filter bag piston seat. This filter bag piston seat has the function of linearly moving up and down along the central axis of the dust collector housing. Under normal operating conditions, the filter bag piston seat is subjected to an elastic thrust applied by a spring, thus moving downwards and maintaining a stable position. When the air pressure input below the filter bag piston seat abnormally increases during dust collector operation, exceeding the normal operating range, the filter bag piston seat will overcome the spring force and move upwards under the action of the pressure difference. As the filter bag piston seat moves upwards, the area below it that was originally used to contain air and dust is relatively expanded, i.e., the actual filtration space increases. This change can effectively disperse and contain more air, preventing a sharp increase in air pressure within the dust collector housing and avoiding abnormally high pressure, ultimately achieving the purpose of overpressure buffer protection. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0025] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0026] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal planar cross-section and a partial method of the present invention;

[0029] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point E;

[0030] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point F;

[0031] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the protective cover of the present invention;

[0032] Figure 7 This is a schematic diagram of the three-dimensional structure of the assembled bag piston seat and support base of the present invention;

[0033] Figure 8 This is a schematic diagram of the installation of the rotating sleeve of the present invention and its internal three-dimensional structure.

[0034] In the diagram: 1. Dust collector housing; 2. Protective cover; 200. Protective piston; 201. Leak-proof sleeve; 202. Detection center rod; 203. One-way valve; 3. Detection cylinder; 300. Detection piston; 3001. Spring top rod; 3002. Vent hole; 4. Alarm light; 5. Detection element; 6. Bag piston seat; 601. Support base; 7. Bag body; 8. Bag baffle; 9. Rotating sleeve; 900. Backflush hole; 10. Air blowing pipe; 11. Axial flow fan blade; 12. Leak detection top rod; 120. Alarm whistle. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1, Figure 1 The diagram shows the overall external structure of this application. It is evident that the dust collector housing 1 is cylindrical, with multiple mounting brackets welded to its outer circumference. These brackets allow the dust collector housing 1 to be fixedly installed in the desired position. An air inlet pipe is welded to the bottom outer side of the dust collector housing 1. This inlet pipe is typically connected to components such as a fan. The fan delivers the air to be treated to the inner cavity of the dust collector housing 1, where air purification is completed, preventing untreated air from polluting the atmosphere. The purified air is discharged from the outlet pipe welded to the top outer side of the dust collector housing 1. A dust discharge hopper is installed at the bottom of the dust collector housing 1 using a flange. A valve is typically connected below the hopper. Normally, the valve is closed. When it is necessary to discharge filtered dust and impurities, the valve is opened. A protective cover 2 is bolted to the top of the dust collector housing 1. Figure 2 and Figure 6 As can be seen, a protective piston 200 is movably fitted inside the protective cover 2. The protective piston 200 and the inner side of the protective cover 2 are slidably sealed by a sealing ring. The protective piston 200 can reciprocate up and down along the central axis of the protective cover 2. A detection center rod 202 is threadedly connected to the upper and lower ends of the protective piston 200. A spring located on the outer side of the detection center rod 202 is movably installed between the top of the inner side of the protective cover 2 and the top of the protective piston 200. Pushed by the spring, the protective piston 200 always has a downward tendency. Finally, the detection center rod 202 below the protective piston 200 is inserted into the inner cavity of the dust collector housing 1.

[0037] Combination Figure 2 , Figure 3 and Figure 7It can be seen that inside the dust collector housing 1 is a bag piston seat 6 connected by a sealing ring. The bag piston seat 6 can reciprocate up and down along the central axis of the dust collector housing 1. The bottom end of the detection center rod 202 is threadedly connected to the bag piston seat 6. Under normal conditions, due to the downward push of the elastic force above the protective piston 200, the detection center rod 202 pushes the bag piston seat 6 down to the bottom as well. At the bottom of the bag piston seat 6 is a support base 601 fixed by a connecting threaded rod. The support base 601 is coaxially arranged with the bag piston seat 6. From Figure 5 and Figure 7 As can be seen, both the bottom surface of the bag piston seat 6 and the surface of the support base 601 have bag mounting seats secured by flanges. The upper and lower ends of the bag body 7 are secured to the mounting seats using clamps, thereby achieving the installation and fastening of the bag body 7. Regarding the number of bag bodies 7, this application uses four as an illustration; the actual number can be adjusted adaptively according to the actual scenario.

[0038] In application, the airflow direction is as follows Figure 3 As shown, the air to be treated is introduced into the dust collector housing 1 through the air inlet pipe at the bottom outside the dust collector housing 1 by a fan. After being filtered by the filter bag body 7, the air is purified. Finally, the purified air is discharged from the air outlet pipe at the top outside the dust collector housing 1.

[0039] Meanwhile, when the filter bag body 7 becomes blocked or an upstream equipment malfunction causes a sudden increase in gas flow, the air pressure inside the dust collector housing 1 increases sharply. To prevent excessive pressure from causing the filter bag body 7 to rupture, the overpressure protection mechanism proposed in this embodiment increases the pressure inside the dust collector housing 1, forcing the filter bag piston seat 6 to move upwards. The upward-moving filter bag piston seat 6 pushes the protection piston 200 upwards synchronously according to the detection center rod 202. The upward-moving protection piston 200 overcomes the elastic force of the upper spring, causing both the protection piston 200 and the filter bag piston seat 6 to move upwards. After the filter bag piston seat 6 moves upwards, the actual space below it and inside the dust collector housing 1 increases, preventing the pressure inside the dust collector housing 1 from continuously rising and causing overpressure damage to the filter bag body 7.

[0040] In summary, it can be seen that by using the method provided in this embodiment, after overpressure occurs in the inner cavity of the dust collector housing 1, the protective piston 200 and the bag piston seat 6 move upward to achieve elastic buffering, thus avoiding the problem of damage to the bag body 7 caused by overpressure in the inner cavity of the dust collector housing 1.

[0041] Example 2 is a supplement to Example 1; please refer to [link / reference]. Figure 2 , Figure 3 and Figure 8It can be seen that a bag baffle 8 is fixedly installed at the top of the inner cavity of the dust collector housing 1. The bag baffle 8 is composed of multiple cylindrical rods arranged in a ring at equal angles; the bottom of the bag baffle 8 passes through the support base 601 and is fitted together with the support base 601. From Figure 3 and Figure 5 As can be seen, the bag baffle 8 is located inside the bag body 7. When the pressure inside the dust collector housing 1 is too high, the bag baffle 8 can provide some support and limit the movement of the bag body 7. Furthermore, when the bag piston seat 6 moves upward, since the support base 601 and the bag baffle 8 can move relative to each other, the bag baffle 8 will not obstruct the upward movement of the bag piston seat 6 and the bag body 7.

[0042] When the filter bag body 7 filters for an extended period, filtered dust accumulates on its outer side. Currently, dust removal primarily employs a high-pressure backflushing method. Specifically, a high-pressure airflow nozzle is installed at the top of the inner cavity of the filter bag body 7. This nozzle uses a high-pressure pulsed airflow to momentarily impact the filter bag, generating vibration and a reverse airflow to peel off the accumulated dust. Because the filter bag body 7 has a certain length, the intensity of the high-pressure airflow gradually decreases as it moves downwards, resulting in less effective airflow to the lower filter bag. To address this issue, a new method is developed... Figure 2 , Figure 3 and Figure 6 As shown, a high-pressure air pipe is welded to the outside of the protective cover 2 to supply high-pressure air into its inner cavity. The high-pressure air pipe is generally connected to an air storage tank. A solenoid valve is generally installed on the high-pressure air pipe. After the solenoid valve is opened, the high-pressure air in the air storage tank will be delivered to the inner cavity located below the protective piston 200.

[0043] Combination Figure 3 , Figure 5 and Figure 8 It can be seen that two positioning seats are fixed in the middle of the bag-blocking frame 8. The positioning seats are fastened to the bag-blocking frame 8, thereby limiting the position of multiple bag-blocking frames 8. A certain distance is left between the two positioning seats in terms of vertical height, and within this distance, a rotating sleeve 9 is movably installed between the positioning seats. Figure 8 As shown, ball bearings are installed between the upper and lower ends of the rotating sleeve 9 and the positioning seat, allowing the rotating sleeve 9 to rotate along the central axis of the positioning seat. Multiple backflush holes 900 are evenly spaced on the outer circumference of the rotating sleeve 9. Simultaneously, an air blowing pipe 10, connected to the multiple backflush holes 900, is threadedly fastened to the top of the rotating sleeve 9. (Reference) Figure 3It is known that the top of the air blowing pipe 10 passes through the top of the dust collector housing 1 and is located in the inner cavity of the protective cover 2. A ball bearing is provided between the air blowing pipe 10 and the dust collector housing 1, allowing the air blowing pipe 10 to rotate. In actual installation, a sealing ring is used to seal the relative rotation between the air blowing pipe 10 and the dust collector housing 1, preventing direct communication between the inner cavity of the protective cover 2 and the inner cavity of the dust collector housing 1. When backflushing cleaning of the filter bag body 7 is required, high-pressure airflow is input into the protective cover 2 through the high-pressure air pipe. The high-pressure airflow is ejected from the backflushing hole 900 through the air blowing pipe 10 and acts on the filter bag body 7 to achieve backflushing cleaning. On the other hand, the high-pressure air delivered to the inner cavity of the protective cover 2 also pushes the protective piston 200 upward, while compressing the spring above the protective piston 200. When the protective piston 200 moves upward, the detection center rod 202 will drag the filter bag piston seat 6 and the support base 601 to move upward synchronously. As the bag piston seat 6 and the support base 601 drive the bag body 7 upward, the bag body 7 moves upward relative to the rotating sleeve 9. The high-pressure airflow ejected from the back punch 900 is used to blow air in the reverse direction on the bag body 7, ensuring that the high-pressure airflow thoroughly cleans the side of the bag body 7.

[0044] In order to enable the bag body 7 to be cleaned at the appropriate time, from Figure 3 , Figure 4 and Figure 6 As can be seen, a detection cylinder 3 is fixedly connected to the top of the protective cover 2 and arranged coaxially therewith, and the inner cavity of the detection cylinder 3 is in communication with the inner cavity of the protective cover 2. A detection piston 300 is sealed inside the detection cylinder 3, and the detection piston 300 can reciprocate up and down along the central axis of the detection cylinder 3. Figure 4 As shown, a spring connects the top of the detection piston 300 to the top of the inner cavity of the detection cylinder 3. Driven by the spring, the detection piston 300 is always inclined to move downwards. The inner side of the detection piston 300 is movably fitted with the detection center rod 202 above the protective piston 200. A spring push rod 3001 is movably installed on the inner side of the detection piston 300. The spring push rod 3001 can abut against the arc-shaped groove on the outer side of the top of the detection center rod 202. It should be noted that the spring push rod 3001 refers to a round rod pushed outwards by a spring, with its top abutting against the arc groove. When the relative motion between the detection piston 300 and the detection center rod 202 is too strong and overcomes the spring push rod 3001, causing it to disengage from the arc groove, the detection piston 300 will not move synchronously with the detection center rod 202. The surface of the detection piston 300 is also provided with a vent hole 3002. The vent hole 3002 can be used to connect the inner cavity of the protective cover 2 and the cavity above the protective piston 200 with the outside. Since the vent hole 3002 is a fine round hole, it can prevent the airflow in the inner cavity of the protective cover 2 from being discharged out quickly.

[0045] The significance of this design lies in its ability to, in practical applications, [from...] Figure 2 As can be seen, detection elements 5 are fixedly installed on the top outer side of the protective cover 2 and the bottom outer side of the detection cylinder 3. Detection elements 5 are generally connected to a control unit, such as a PLC controller. Detection elements 5 serve as position detection elements and can be selected from components such as jog switches or proximity sensors. Under normal conditions, such as... Figure 3 As shown, the protective piston 200 is pushed by the top spring, positioning it at the bottom of the inner cavity of the protective cover 2; the detection piston 300 is also pushed by the top spring, positioning it at the bottom of the inner cavity of the detection cylinder 3. At this time, the detection piston 300 contacts the detection element 5 on the detection cylinder 3, while the protective piston 200 does not contact the detection element 5 on the protective cover 2, and the solenoid valve connected to the high-pressure air pipe is also in a blocked state. Simultaneously, the detection piston 300, descending to the bottom, causes the spring push rod 3001 to abut against the top annular groove of the detection center rod 202.

[0046] According to the description in Embodiment 1, the air is filtered and purified. After prolonged filtration, the filter bag body 7 becomes clogged, which leads to a relative increase in air pressure inside the dust collector housing 1, pushing the filter bag piston seat 6 upward. When the filter bag piston seat 6 pushes the protective piston 200 upward via the detection center rod 202, the detection center rod 202 above the protective piston 200 drives the detection piston 300 to move upward synchronously according to the spring push rod 3001 until the detection piston 300 moves away from the detection element 5. At this time, after the detection element 5 on the detection cylinder 3 detects the upward signal of the detection piston 300, the detection element 5 will send an electrical signal to the control unit to keep the solenoid valve continuously connected.

[0047] The high-pressure airflow in the gas tank is delivered into the inner cavity of the protective cover 2, which in turn pushes the protective piston 200 to move further upward. On the one hand, the upward movement of the protective piston 200 will drive the detection piston 300 to move further upward until the detection piston 300 compresses the upper spring to its limit, forcing the spring push rod 3001 and the ring groove to disengage. Afterward, since the airflow in the inner cavity of the protective cover 2 can only flow out slowly from the vent hole 3002, the air in the inner cavity of the protective cover 2 still has resistance to the downward movement of the detection piston 300, which forces the detection piston 300 to be unable to move downward and contact the detection element 5 on the detection cylinder 3 during the continuous upward movement of the protective piston 200. On the other hand, the high-pressure airflow in the protective cover 2 passes through the air blowing pipe 10 and is ejected from the backflush hole 900, using the airflow ejected from the backflush hole 900 to perform a comprehensive reverse jet cleaning of the bag body 7.

[0048] Finally, as the protective piston 200 continues to move upward, it eventually reaches its top limit and comes into contact with the detection element 5 on the outside of the protective cover 2. The backflush hole 900 has also cleared all the blockages in the bag body 7. At this point, the rotating sleeve 9 is in the inner cavity of the bag mounting seat on the support base 601. Since the protective piston 200 cannot continue to move upward after reaching its top limit, the spring pushes the detection piston 300 downward. The detection piston 300 eventually moves back to the side of the detection element 5. At this point, both detection elements 5 detect the corresponding detection piston 300 and protective piston 200, and then send an electrical signal to the control unit, causing the solenoid valve to close, and the inner cavity of the protective cover 2 no longer receives high-pressure airflow. Pushed by the spring above the protective piston 200, the protective piston 200 moves downward, and the detection center rod 202 pushes the bag piston seat 6 downward synchronously until it returns to its normal position. During this process, to facilitate the rapid descent of the protective piston 200, from... Figure 1 and Figure 4 It can be seen that a one-way valve 203 is fixedly installed on the top of the protective cover 2, and the one-way valve 203 enables the external airflow to be delivered unidirectionally into the inner cavity of the protective cover 2, ensuring that the protective piston 200 can fall quickly during the recovery process.

[0049] To ensure that the bag filter piston seat 6 tends to move rapidly upwards after a sudden increase in pressure within the dust collector housing 1, combined with... Figure 2 , Figure 3 and Figure 6 As can be seen, a rectangular groove communicating with its inner cavity is opened on the bottom outer side of the protective cover 2. A leak-proof sleeve 201 is installed inside the protective cover 2, located below the protective piston 200. A spring is installed between the bottom of the leak-proof sleeve 201 and the top of the dust collector housing 1. The spring force is less than the spring force above the protective piston 200. Under normal conditions, when the protective piston 200 descends to its bottom limit, the rectangular groove is above the protective piston 200. When the airflow in the dust collector housing 1 suddenly increases, the airflow in the inner cavity of the protective cover 2 can quickly escape through the rectangular groove when the protective piston 200 moves upward, ensuring that the bag filter piston seat 6 has a certain upward buffer space. In conjunction with the above, when the protective piston 200 moves upward a certain distance, it will cause the high-pressure air pipe to input high-pressure airflow into the inner cavity of the protective cover 2. Most of the high-pressure airflow will push the protective piston 200 upward, forcing the protective piston 200 to move rapidly upward before crossing the rectangular groove, thereby alleviating the instantaneous high pressure in the inner cavity of the dust collector housing 1. Subsequently, as the high-pressure airflow is continuously input into the protection piston 200, the backflushing and clearing of the filter bag body 7 is achieved again.

[0050] Example 3 is a further improvement on Example 2. Because the filter bag body 7 may leak during prolonged operation, the air purification effect deteriorates. To detect whether the filter bag body 7 is damaged, [the following is implemented]... Figure 3 , Figure 5 and Figure 8 As can be seen, an axial flow fan blade 11 is clamped and fastened between the bottom of the air blowing pipe 10 and the top of the rotating sleeve 9. When the airflow in the air blowing pipe 10 blows the axial flow fan blade 11, it can drive the rotating sleeve 9 to rotate synchronously. The rotating backflush hole 900 blows the bag body 7 in the opposite direction, thereby reducing the dead angle of reverse cleaning.

[0051] A leak-detecting rod 12, pushed outward by a spring, is movably mounted at the bottom of the rotating sleeve 9. When the leak-detecting rod 12 is fully extended outward, an alarm whistle 120 fixed to the side of the leak-detecting rod 12 connects to the air blowing pipe 10. High-pressure airflow from the air blowing pipe 10 quickly passes through the alarm whistle 120, causing it to emit a sharp sound. Similarly, when the leak-detecting rod 12 retracts into the rotating sleeve 9, the alarm whistle 120 and the air blowing pipe 10 are misaligned, and the side of the leak-detecting rod 12 blocks the connection between them. More specifically, the leak-detecting rod 12 is T-shaped with an elliptical end cross-section. When the leak-detecting rod 12 is pushed outward by the spring, the increased length of the end of the leak-detecting rod 12 ensures that the alarm whistle 120 can connect to the air blowing pipe 10 after the leak-detecting rod 12 is fully extended.

[0052] The advantage of this design is that, under normal circumstances, such as Figure 3 and Figure 5 As shown, the rotating sleeve 9 is located above the bag piston seat 6, and the top of the bag piston seat 6 has a conical sleeve that is fastened with bolts. When the bag piston seat 6 moves upward due to excessive pressure at the bottom, it will push the conical sleeve to move upward synchronously, forcing the leak detection rod 12 to retract into the rotating sleeve 9.

[0053] Subsequently, as described in Embodiment 2 above, the backflush hole 900 moves to the inside of the bag body 7 and backflushs to clear blockages. During this process, the airflow in the blowing pipe 10 blows the axial flow fan blade 11, forcing the rotating sleeve 9 to rotate. When the rotating sleeve 9 drives the backflush hole 900 to rotate, it can perform more uniform airflow backflush to clear blockages on the bag body 7, avoiding dead zones in the clearing process. Moreover, when the rotating sleeve 9 rotates, the leak detection rod 12 will abut against the inside of the bag body 7 and rotate synchronously with the rotating sleeve 9. When the bag body 7 is intact, the leak detection rod 12 will not extend fully due to the constraint of the bag body 7. When the bag body 7 is damaged and the leak detection rod 12 passes through the broken part, the leak detection rod 12, pushed by the spring, will be pushed out from the broken part, thereby connecting the alarm whistle 120 and the air blowing pipe 10. The high-pressure airflow in the air blowing pipe 10 will be continuously discharged from the alarm whistle 120 and emit a sharp sound, thereby warning external personnel that the bag body 7 has been damaged and needs to be replaced.

[0054] Furthermore, when the leak detection rod 12 is inserted into the damaged bag body 7, it tends to obstruct the upward movement of the bag body 7. This prevents the protective piston 200 from continuing to drive the bag piston seat 6 upward, and the protective piston 200 will not contact the detection element 5. Subsequently, since the protective piston 200 does not have an upward tendency, it will not further compress the airflow in the inner cavity of the protective cover 2. Then, the top of the detection piston 300 will be pushed downward by the spring until the detection piston 300 moves to the detection element 5. Since the detection element 5 on the protective cover 2 does not detect the presence of the protective piston 200 at this time, the solenoid valve will not close, and the high-pressure airflow will continue to enter the protective cover 2, and the alarm whistle 120 will continue to sound. To further enhance the warning effect, when the detection piston 300 contacts the detection element 5, the protective piston 200 does not contact the detection element 5, and the solenoid valve is working normally, these three factors act as activation signals, enabling the alarm light 4 fixed on the protective cover 2 to start working. The alarm light 4 will start flashing, thereby increasing the warning effect. Subsequently, when maintenance personnel replace the broken filter bag body 7, they only need to check whether the leak detection rod 12 on the filter bag body 7 is extended to quickly determine the location of the breakage, which facilitates the replacement.

[0055] It should be added that when the leak detection rod 12 is inserted into the damaged part of the filter bag body 7, even if the high-pressure airflow is delivered to the protective cover 2, causing the upward force of the protective piston 200 to continuously increase, and the upward force of the filter bag piston seat 6 to increase, the filter bag body 7 will tear and move upward along with the filter bag piston seat 6 because the leak detection rod 12 has already extended. Therefore, the filter bag mounting seat on the support base 601 will be blocked by the extended leak detection rod 12, forcing the alarm effect to remain active. The torn filter bag body 7 is also easier for operators to find during subsequent maintenance.

Claims

1. An overpressure protection device for a dust collector, characterized in that, include: Dust collector housing (1), dust-laden airflow enters from the inlet pipe at the bottom of the outer side of the dust collector housing (1), and after the purification process is completed inside the dust collector housing (1), the clean air is discharged from the outlet pipe at the top of its outer side; The protective cover (2) is fixed on the top of the dust collector housing (1). The protective cover (2) is fitted with a protective piston (200). The upper and lower ends of the protective piston (200) are equipped with detection center rods (202). The protective piston (200) is pushed by a spring installed on the top of the inner side of the protective cover (2) and has a tendency to move downward. The bag piston seat (6) is fitted inside the dust collector housing (1). The top of the bag piston seat (6) is threaded to the bottom of the detection center rod (202). The bottom of the bag piston seat (6) is fixed with a support base (601). The bottom surface of the bag piston seat (6) and the surface of the support base (601) can install and limit the bag body (7) through the bag mounting seat. When the airflow input into the intake pipe increases abnormally, the bag piston seat (6) will push the protective piston (200) upward through the detection center rod (202), and at the same time squeeze the spring above the protective piston (200) to achieve elastic buffering; A baffle frame (8) is fixedly installed on the top of the inner cavity of the dust collector housing (1), and the bottom of the baffle frame (8) is movably fitted with the support base (601). The baffle frame (8) can support the outer part of the cloth bag body (7). The protective cover (2) is equipped with a high-pressure air pipe that allows compressed air to be introduced into the inner cavity below the protective piston (200); The middle part of the baffle frame (8) is fitted with a rotating sleeve (9) using a positioning seat. The rotating sleeve (9) has back punch holes (900) at equal angles on the outer circumference. The top of the rotating sleeve (9) is fastened with an air blowing pipe (10) that communicates with the back punch holes (900). The top of the air blowing pipe (10) passes through the top of the dust collector housing (1) and is located in the inner cavity of the protective cover (2).

2. The overpressure protection device for a dust collector according to claim 1, characterized in that, The top of the protective cover (2) is fixedly connected to a detection cylinder (3) that communicates with the inner cavity of the protective cover (2). A detection piston (300) is fitted inside the detection cylinder (3). The detection piston (300) is pushed downward by a spring installed at the top of the inner cavity of the detection cylinder (3). The inner side of the detection piston (300) is movably fitted with the detection center rod (202) above the protective piston (200). A spring push rod (3001) is movably installed inside the detection piston (300). The spring push rod (3001) can abut against the arc-shaped annular groove on the outer side of the top of the detection center rod (202).

3. The overpressure protection device for a dust collector according to claim 2, characterized in that, The surface of the detection piston (300) is provided with a vent hole (3002).

4. The overpressure protection device for a dust collector according to claim 2, characterized in that, The top of the outer side of the protective cover (2) and the bottom of the outer side of the detection cylinder (3) are both fixedly installed with detection elements (5).

5. The overpressure protection device for a dust collector according to claim 2, characterized in that, A rectangular groove communicating with its inner cavity is opened on the bottom of the outer side of the protective cover (2). A leak-proof sleeve (201) located below the protective piston (200) is installed inside the protective cover (2), and a spring is provided between the bottom of the leak-proof sleeve (201) and the top of the dust removal housing (1).

6. The overpressure protection device for a dust collector according to claim 5, characterized in that, An axial flow fan blade (11) is clamped and fastened between the bottom of the air pipe (10) and the top of the rotating sleeve (9).

7. The overpressure protection device for a dust collector according to claim 6, characterized in that, The bottom of the rotating sleeve (9) is movably installed with a leak-testing rod (12) that is pushed outward by a spring. After the leak-testing rod (12) is pushed outward, the alarm whistle (120) fixed on the side of the leak-testing rod (12) will be connected to the air blowing pipe (10). High-pressure airflow is used to blow through the alarm whistle (120) and realize the sound alarm.

8. A control method for an overpressure protection device for a dust collector as described in claim 1, characterized in that, Includes the following steps: S1. The fan inputs the dust-laden airflow from the air inlet pipe at the bottom of the outer side of the dust collector housing (1) into the inner cavity of the dust collector housing (1) to provide the airflow to be treated for subsequent air purification treatment; S2. The air input into the inner cavity of the dust collector housing (1) passes through the bag body (7), and the bag body (7) filters the impurities in the air to complete the air purification process and remove dust pollutants from the air. S3. The air purified by the bag body (7) is discharged from the air outlet pipe at the top of the outer side of the dust collector housing (1) to realize the output of purified air; S4. When the bag body (7) is blocked or the upstream equipment fails, the gas flow rate increases instantaneously, which in turn causes the air pressure in the inner cavity of the dust collector housing (1) to increase sharply, the bag piston seat (6) tends to move upward. S5. The upward-moving bag piston seat (6) pushes the protective piston (200) upward synchronously according to the detection center rod (202). The upward-moving protective piston (200) overcomes the elastic force of the upper spring, so that the protective piston (200) and the bag piston seat (6) have an upward trend. S6. After the bag piston seat (6) moves upward, it increases the actual space below and is located in the inner cavity of the dust collector housing (1) to avoid the pressure in the inner cavity of the dust collector housing (1) from continuously rising and causing overpressure damage to the bag body (7).

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