Negative pressure self-alarm filter device

Abstract

The application relates to the field of liquid treatment, in particular to a negative pressure self-alarming filter device which comprises a rigid vertical cylinder, a quick-release inner filter is arranged in the inside of the rigid vertical cylinder, a feeding pipe is arranged on the outer sidewall of the rigid vertical cylinder at the upper portion of the quick-release inner filter; a plugging bottom cover is tightly screwed on the bottom of the rigid vertical cylinder, a discharging pipe is arranged on the outer sidewall of the lower portion of the rigid vertical cylinder, a plugging top cover is arranged on the upper connecting flange of the top of the rigid vertical cylinder, one side of the plugging top cover is connected with the upper connecting flange through a lifting lug bolt, a pressure reference control component is arranged at the center hole of the plugging top cover, and an output end pressure component matched with the pressure reference control component is arranged on the rear sidewall of the lower portion of the rigid vertical cylinder.

Description

Technical Field

[0001] This invention relates to the field of liquid treatment, and particularly to a filtration device that can filter out solids larger than a designed diameter when a liquid contains solids of different diameters, especially a negative pressure self-alarm filtration device. Background Technology

[0002] In the process of liquid processing, if the liquid contains solid objects of different diameters, larger solid objects may cause blockage of pipes or impeller jamming during pumping.

[0003] Existing filters typically use a screen as a frame, with a filter bag placed inside. Excessive impurities are filtered out through the filter bag. However, the filter bag is usually not reusable after use, which undoubtedly leads to a waste of resources and increased costs.

[0004] Therefore, many organizations have proposed improvement solutions to address the problems of the existing filter bags. For example, patent document CN201820697817.2 discloses an enhanced liquid filter bag, whose main structure includes an inlet pipe (1) and a water pump (2). The inlet pipe (1) is equipped with a water pump (2). The filter bag is characterized by having a screen (3) fixedly connected to the inner cavity of the inlet pipe (1), and having a trapezoidal through hole that penetrates the top wall of the waste collection box (4) on the bottom wall of the inlet pipe (1). The upper end of the waste collection box (4) is connected to the inlet pipe (3). The lower end of the side wall of the liquid pipe (1) is fixedly connected. A cleaning brush (5) is abutted on the side wall of the screen (3) near the water pump (2). The upper middle part of the cleaning brush (5) is vertically connected to the lower end of the T-shaped rod (6). A horizontal section of the T-shaped rod (6) penetrates the top wall of the liquid inlet pipe (1) and reaches the outer cavity of the liquid inlet pipe (1). A strip-shaped through hole is opened on the horizontal section of the T-shaped rod (6). A slider is slidably connected in the strip-shaped through hole. The end of the slider away from the water pump (2) is vertically connected to the edge of one side wall of the circular turntable (7). The middle part of the other side wall of the circular turntable (7) is vertically connected to... The rotating shaft on the motor (8) is connected, and the motor (8) is fixedly connected to the upper end of the liquid inlet pipe (1) through the bracket. The output end of the liquid inlet pipe (1) is connected through to the input end of the enhanced filter device (9). The enhanced filter device (9) consists of a first connecting pipe (91), a second connecting pipe (92), a U-shaped frame (93), a ring (94), a sleeve (95), and an L-shaped filter bag (96). The output end of the liquid inlet pipe (1) is connected through to the input end of the first connecting pipe (91), and the output end of the first connecting pipe (91) is connected through to the side wall of the second connecting pipe (92). In the middle, the two ends of the second connecting pipe (92) are vertically connected to the opposite inner sidewalls of the U-shaped frame (93), and multiple sleeves (95) are fixedly connected through the sidewall of the second connecting pipe (92) away from the first connecting pipe (91). The inner sidewall of the sleeve (95) is threadedly connected to the outer sidewall of the ring (94). A transverse section of the L-shaped filter bag (96) is fixedly connected to the sidewall of the ring (94) away from the second connecting pipe (92), and the outer sidewall of the L-shaped filter bag (96) away from the ring (94) is fixedly connected to the inner sidewall of the U-shaped frame (93).

[0005] In summary, it can be seen that its overall structure is relatively complex. Although it can use a screen to achieve primary filtration to extend the service life and effectiveness of the L-shaped filter bag 96, from an overall perspective, after filtering out too much solid matter, the solid matter accumulated inside the filter bag will block the liquid flow, causing the flow rate to gradually decrease. Moreover, during the gradual blockage process, the entire process is within a sealed container, which cannot be observed or detected, and it is impossible to determine whether cleaning is necessary.

[0006] If this continues for a long time, the pump may become unable to pump liquid during operation, which can easily lead to overload and damage to the pump.

[0007] Therefore, this application proposes a new filtration device that can filter out solids larger than the designed diameter when a liquid is mixed with solids of different diameters. This device, when applied in our company's water treatment process, can effectively solve the problems existing in the prior art. Summary of the Invention

[0008] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: a negative pressure self-alarm filter device, wherein the negative pressure self-alarm filter device is installed upstream of an external power pump body and used in conjunction with the power pump body; impurities first pass through the negative pressure self-alarm filter device and then through the power pump body, and negative pressure extraction is achieved through the operation of the power pump body.

[0009] The negative pressure self-alarm filter device includes a rigid vertical cylinder, inside which a quick-release internal filter is installed, and an inlet pipe is provided on the outer wall of the rigid vertical cylinder above the quick-release internal filter.

[0010] The bottom of the rigid cylinder is sealed with a bottom cover. A discharge pipe is provided on the outer side wall of the lower part of the rigid cylinder. A top cover is installed on the upper connecting flange at the top of the rigid cylinder. One side of the top cover is connected to the upper connecting flange by a lifting lug bolt. A pressure reference control component is installed at the center hole of the top cover. An output pressure component that cooperates with the pressure reference control component is installed on the lower rear side wall of the rigid cylinder.

[0011] In any of the above embodiments, it is preferred that the quick-release internal filter includes a filter screen cylinder coaxially arranged with the rigid vertical cylinder, and a plurality of screen mesh holes are provided on the bottom and outer side wall surface of the filter screen cylinder. The top of the filter screen cylinder is open, and an inner connecting flange is fixedly installed on the top of the filter screen cylinder. The inner connecting flange is bolted and fixed to the inner wall of the rigid vertical cylinder.

[0012] In any of the above embodiments, it is preferred that the pressure reference control component includes a top air inlet pipe, and an upper tee is installed on the top of the top air inlet pipe. The two inlet ends of the upper tee are respectively connected to a reference vacuum gauge and an upper ball valve through a straight pipe, a bent pipe, and a core connector.

[0013] In any of the above embodiments, it is preferred that a venting pipe with a venting ball valve is provided on the lower outer wall of the rigid vertical cylinder on the opposite side of the discharge pipe, and the height of the venting pipe is lower than the height of the discharge pipe.

[0014] In any of the above embodiments, it is preferred that a sealing gasket is provided between the sealing top cover and the upper connecting flange.

[0015] In any of the above embodiments, the preferred embodiment is that the output pressure component includes a lower tee installed on the lower rear outer side wall of the rigid vertical cylinder, and an electric contact pressure gauge and a lower opening and closing regulating valve are respectively connected to the two branch pipe openings of the lower tee; when the electric contact pressure gauge reaches the set pressure, it will activate the alarm connected to it and trigger an alarm.

[0016] Electrical contact pressure gauges are used to measure the pressure of fluids entering the system. They are used in conjunction with appropriate external electrical devices (such as relays and frequency converters).

[0017] In any of the above solutions, it is preferred that the mesh size of the filter cylinder is selected based on the maximum diameter of the solid material that can pass through the power pump body that it is paired with.

[0018] In any of the above embodiments, it is preferred that a plurality of pulse nozzles are fixedly installed on the inner side wall of the rigid vertical cylinder outside the filter screen cylinder. Each pulse nozzle is used to spray high-pressure airflow from the outside to the inside in the radial direction to clear the blocked mesh holes on the filter screen cylinder. The pulse nozzles are connected to an external pulse air source.

[0019] In any of the above solutions, it is preferred that the jetting action of each pulse nozzle is synchronized with the action of the alarm.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This system uses a rigid filter cylinder instead of a traditional filter bag, which can be reused and effectively filters impurities in the feed when working with an external power pump, thus providing better protection for the pump.

[0022] 2. The cooperation between the pressure reference control component and the output pressure component of this system can trigger an alarm when the pressure inside the rigid cylinder reaches the set value. The set value is the upper limit index that the current filter screen can withstand. That is, when the alarm sounds, it means that the internal blockage of the filter screen cylinder is relatively serious and needs to be cleaned and replaced in time. This effectively converts the invisible internal blockage into a signal that can be intuitively judged, and better realizes the pre-protection of the pump body.

[0023] 3. At the same time, multiple pulse air nozzles installed on the side wall of the rigid cylinder can clean in time when an alarm occurs, which can further effectively serve the purpose of temporarily cleaning the filter screen mesh. After cleaning, the alarm is canceled, ensuring normal use in the short term, thus providing a safe extension period for short-term extended maintenance and avoiding pump damage caused by untimely maintenance. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0027] Figure 3 This is a top-view internal cross-sectional structural diagram of the present invention.

[0028] In the diagram, 1. Rigid vertical cylinder; 2. Feed pipe; 3. Sealing bottom cover; 4. Discharge pipe; 5. Upper connecting flange; 6. Sealing top cover; 7. Lifting lug bolt; 8. Filter screen cylinder; 9. Inner connecting flange; 10. Top air inlet pipe; 11. Upper tee; 12. Reference vacuum gauge; 13. Upper opening and closing regulating valve; 14. Venting ball valve; 15. Venting pipe; 16. Sealing gasket; 17. Lower tee; 18. Electrical contact pressure gauge; 19. Lower opening and closing regulating valve; 20. Alarm; 21. Pulse nozzle. Detailed Implementation

[0029] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. The specific structure of the present invention is as follows: Figure 1-3 As shown in the image.

[0030] Example 1:

[0031] A negative pressure self-alarm filter device is installed upstream of an external power pump body and used in conjunction with the power pump body. Impurities first pass through the negative pressure self-alarm filter device and then through the power pump body. The negative pressure is extracted through the operation of the power pump body.

[0032] The negative pressure self-alarm filter device includes a rigid vertical cylinder 1, a quick-release internal filter is installed inside the rigid vertical cylinder 1, and a feed pipe 2 is provided on the outer wall of the rigid vertical cylinder 1 above the quick-release internal filter.

[0033] The built-in quick-release internal filter can effectively filter the liquid containing impurities entering through the feed pipe 2, thereby ensuring that the output liquid contains as few large impurities as possible and effectively protecting the downstream power pump body.

[0034] The bottom of the rigid vertical cylinder 1 is sealed with a bottom cover 3. A discharge pipe 4 is provided on the outer side wall of the lower part of the rigid vertical cylinder 1. A top cover 6 is installed on the upper connecting flange 5 at the top of the rigid vertical cylinder 1. One side of the top cover 6 is connected to the upper connecting flange 5 by a lifting bolt 7. A pressure reference control component is installed at the center hole of the top cover 6. An output pressure component that cooperates with the pressure reference control component is installed on the lower rear side wall of the rigid vertical cylinder 1.

[0035] The pressure reference control component and the output pressure component work together to trigger an alarm when the pressure inside the rigid cylinder 1 reaches the set value. The set value is the upper limit index that the current filter screen can withstand. That is, when the alarm 20 sounds, it means that the internal blockage of the filter screen cylinder 8 is quite serious and needs to be cleaned and replaced in time. This effectively converts the invisible internal blockage into a signal that can be judged intuitively, and better realizes the pre-protection of the pump body.

[0036] In any of the above embodiments, it is preferred that the quick-release internal filter includes a filter screen cylinder 8 coaxially arranged with the rigid vertical cylinder 1, and a plurality of screen mesh holes are provided on the bottom and outer side wall surface of the filter screen cylinder 8. The top of the filter screen cylinder 8 is open, and an inner connecting flange 9 is fixedly installed on the top of the filter screen cylinder 8. The inner connecting flange 9 is bolted and fixed to the inner wall of the rigid vertical cylinder 1.

[0037] When installing the quick-release internal filter, simply remove the lifting lug bolts 7 from the top of the rigid cylinder 1, then remove the sealing top cover 6, and then fix the inner connecting flange 9 on the inner side wall of the rigid cylinder 1. The installation is then complete. Finally, reinstall the sealing top cover 6.

[0038] The mesh size of the filter cylinder 8 is selected based on the maximum diameter of the solid material that can pass through the power pump body it is paired with.

[0039] In any of the above embodiments, it is preferred that the pressure reference control component includes a top air inlet pipe 10, and an upper tee 11 is installed on the top of the top air inlet pipe 10. The two inlet ends of the upper tee 11 are respectively connected to the reference vacuum gauge 12 and the upper opening and closing regulating valve 13 through a straight pipe, a bent pipe and a core connector.

[0040] The reference vacuum gauge 12 is mainly used as a reference gauge at the upper end. When used with the electrical contact pressure gauge 18 at the lower end, it is used as a reference to adjust and set the set value of the electrical contact pressure gauge 18, so as to adapt to the negative pressure caused by the liquid level difference generated by different liquid level heights. By opening the upper opening and closing regulating valve 13, the internal environment can be connected with the external atmospheric pressure. Of course, in specific use, the opening and closing of the upper opening and closing regulating valve 13 can be adjusted as needed.

[0041] In any of the above embodiments, it is preferred that a venting pipe 15 with a venting ball valve 14 is provided on the lower outer wall of the rigid vertical cylinder 1 on the opposite side of the discharge pipe 4, and the height of the venting pipe 15 is lower than the height of the discharge pipe 4.

[0042] The vent pipe 15 is mainly used to open the vent ball valve 14 during maintenance or repair and to completely release the liquid inside the rigid vertical cylinder 1, thus achieving rapid venting.

[0043] In any of the above solutions, it is preferred that a sealing gasket 16 is provided between the sealing top cover 6 and the upper connecting flange 5, which can serve as a sealing device.

[0044] In any of the above embodiments, the preferred embodiment is that the output pressure component includes a lower tee 17 installed on the lower rear outer side wall of the rigid vertical cylinder 1, and an electric contact pressure gauge 18 and a lower end opening and closing regulating valve 19 are respectively connected to the two branch pipe openings of the lower tee 17; when the electric contact pressure gauge 18 reaches the set pressure, it will activate the alarm 20 electrically connected to it and trigger an alarm.

[0045] The electric contact pressure gauge 18 is used to measure the pressure of the fluid entering the system. It is used in conjunction with appropriate external electrical devices (such as relays and frequency converters).

[0046] The electric contact pressure gauge 18 is used as a terminal to measure the pressure brought by the liquid above it. By comparing it with the set value, it can determine whether the current filter screen 8 is heavily clogged, thereby effectively preventing pump overload. After the warning, the filter screen 8 can be quickly removed and cleaned to reduce the pressure value, providing a basis for maintenance and making the downstream pump safer and more reliable when transporting liquids with more impurities.

[0047] Example 2:

[0048] A negative pressure self-alarm filter device is installed upstream of an external power pump body and used in conjunction with the power pump body. Impurities first pass through the negative pressure self-alarm filter device and then through the power pump body. The negative pressure is extracted through the operation of the power pump body.

[0049] The negative pressure self-alarm filter device includes a rigid vertical cylinder 1, a quick-release internal filter is installed inside the rigid vertical cylinder 1, and a feed pipe 2 is provided on the outer wall of the rigid vertical cylinder 1 above the quick-release internal filter.

[0050] The built-in quick-release internal filter can effectively filter the liquid containing impurities entering through the feed pipe 2, thereby ensuring that the output liquid contains as few large impurities as possible and effectively protecting the downstream power pump body.

[0051] The bottom of the rigid vertical cylinder 1 is sealed with a bottom cover 3. A discharge pipe 4 is provided on the outer side wall of the lower part of the rigid vertical cylinder 1. A top cover 6 is installed on the upper connecting flange 5 at the top of the rigid vertical cylinder 1. One side of the top cover 6 is connected to the upper connecting flange 5 by a lifting bolt 7. A pressure reference control component is installed at the center hole of the top cover 6. An output pressure component that cooperates with the pressure reference control component is installed on the lower rear side wall of the rigid vertical cylinder 1.

[0052] The pressure reference control component and the output pressure component work together to trigger an alarm when the pressure inside the rigid cylinder 1 reaches the set value. The set value is the upper limit index that the current filter screen can withstand. That is, when the alarm 20 sounds, it means that the internal blockage of the filter screen cylinder 8 is quite serious and needs to be cleaned and replaced in time. This effectively converts the invisible internal blockage into a signal that can be judged intuitively, and better realizes the pre-protection of the pump body.

[0053] In any of the above embodiments, it is preferred that the quick-release internal filter includes a filter screen cylinder 8 coaxially arranged with the rigid vertical cylinder 1, and a plurality of screen mesh holes are provided on the bottom and outer side wall surface of the filter screen cylinder 8. The top of the filter screen cylinder 8 is open, and an inner connecting flange 9 is fixedly installed on the top of the filter screen cylinder 8. The inner connecting flange 9 is bolted and fixed to the inner wall of the rigid vertical cylinder 1.

[0054] When installing the quick-release internal filter, simply remove the lifting lug bolts 7 from the top of the rigid cylinder 1, then remove the sealing top cover 6, and then fix the inner connecting flange 9 on the inner side wall of the rigid cylinder 1. The installation is then complete. Finally, reinstall the sealing top cover 6.

[0055] The mesh size of the filter cylinder 8 is selected based on the maximum diameter of the solid material that can pass through the power pump body it is paired with.

[0056] In any of the above embodiments, it is preferred that the pressure reference control component includes a top air inlet pipe 10, and an upper tee 11 is installed on the top of the top air inlet pipe 10. The two inlet ends of the upper tee 11 are respectively connected to the reference vacuum gauge 12 and the upper opening and closing regulating valve 13 through a straight pipe, a bent pipe and a core connector.

[0057] The reference vacuum gauge 12 is mainly used as a reference gauge at the upper end. When used with the electrical contact pressure gauge 18 at the lower end, it is used as a reference to adjust and set the set value of the electrical contact pressure gauge 18, so as to adapt to the negative pressure caused by the liquid level difference generated by different liquid level heights. By opening the upper opening and closing regulating valve 13, the internal environment can be connected with the external atmospheric pressure. Of course, in specific use, the opening and closing of the upper opening and closing regulating valve 13 can be adjusted as needed.

[0058] In any of the above embodiments, it is preferred that a venting pipe 15 with a venting ball valve 14 is provided on the lower outer wall of the rigid vertical cylinder 1 on the opposite side of the discharge pipe 4, and the height of the venting pipe 15 is lower than the height of the discharge pipe 4.

[0059] The vent pipe 15 is mainly used to open the vent ball valve 14 during maintenance or repair and to completely release the liquid inside the rigid vertical cylinder 1, thus achieving rapid venting.

[0060] In any of the above solutions, it is preferred that a sealing gasket 16 is provided between the sealing top cover 6 and the upper connecting flange 5, which can serve as a sealing device.

[0061] In any of the above embodiments, the preferred embodiment is that the output pressure component includes a lower tee 17 installed on the lower rear outer side wall of the rigid vertical cylinder 1, and an electric contact pressure gauge 18 and a lower end opening and closing regulating valve 19 are respectively connected to the two branch pipe openings of the lower tee 17; when the electric contact pressure gauge 18 reaches the set pressure, it will activate the alarm 20 electrically connected to it and trigger an alarm.

[0062] The electric contact pressure gauge 18 is used to measure the pressure of the fluid entering the system. It is used in conjunction with appropriate external electrical devices (such as relays and frequency converters).

[0063] The electric contact pressure gauge 18 is used as a terminal to measure the pressure brought by the liquid above it. By comparing it with the set value, it can determine whether the current filter screen 8 is heavily clogged, thereby effectively preventing pump overload. After the warning, the filter screen 8 can be quickly removed and cleaned to reduce the pressure value, providing a basis for maintenance and making the downstream pump safer and more reliable when transporting liquids with more impurities.

[0064] In any of the above solutions, it is preferable that the lower tee 17 is located on the side wall of the rigid vertical cylinder 1 below the filter screen cylinder 8, which can make the measured value more accurate.

[0065] In any of the above embodiments, it is preferred that a plurality of pulse nozzles 21 are fixedly installed on the inner wall of the rigid vertical cylinder 1 outside the filter cylinder 8. Each pulse nozzle 21 is used to spray high-pressure airflow from the outside to the inside in the radial direction to clear the blocked mesh holes on the filter cylinder 8. The pulse nozzles 21 are connected to an external pulse air source.

[0066] Multiple pulse air nozzles installed on the side wall of the rigid vertical cylinder 1 can be cleaned in time when an alarm occurs, thereby effectively cleaning the mesh of the filter cylinder 8 temporarily. After cleaning, the alarm is canceled, ensuring normal use in the short term and providing a safe extension period for short-term extended maintenance, thus avoiding pump damage caused by untimely maintenance.

[0067] In any of the above solutions, it is preferred that the jetting action of each pulse nozzle 21 is synchronized with the action of the alarm 20.

[0068] Specific working principle:

[0069] The system is pre-installed, and the inlet pipe 2 and outlet pipe 4 are connected to the corresponding pipelines, ensuring the entire system works in conjunction with the power pump. Upon starting the power pump, the built-in quick-release internal filter effectively filters the liquid containing impurities entering through the inlet pipe 2, minimizing the amount of large impurities in the output liquid and effectively protecting the downstream power pump. The pressure reference control component, in conjunction with the output pressure component, triggers an alarm when the pressure inside the rigid cylinder 1 reaches a set value. The set value is the upper limit that the current filter screen can withstand. When alarm 20 sounds, it indicates that the filter cylinder 8 is severely clogged and requires immediate cleaning and replacement. This effectively transforms the invisible internal blockage into a readily identifiable signal, providing better pre-emptive protection for the pump. The reference vacuum gauge 12 is mainly used as a reference gauge at the upper end. When used with the lower electrical contact pressure gauge 18, it serves as a reference to adjust the set value of the electrical contact pressure gauge 18, thereby adapting to the negative pressure caused by the liquid level difference at different liquid levels. By opening the upper opening and closing regulating valve 13, the internal environment can be connected to the external atmospheric pressure. Of course, in actual use, the opening and closing of the upper opening and closing regulating valve 13 can be adjusted as needed. The electrical contact pressure gauge 18 serves as the terminal to measure the pressure brought by the liquid above it. By comparing it with the set value, it can determine whether the current filter screen 8 is heavily clogged, thereby effectively preventing pump overload. After the warning, the filter screen 8 can be quickly removed and cleaned to reduce the pressure value, providing a basis for maintenance and making the downstream pump safer and more reliable when transporting liquids with more impurities. Meanwhile, multiple pulse air nozzles installed on the side wall of the rigid vertical cylinder 1 can clean in time when an alarm occurs, thereby effectively cleaning the mesh of the filter cylinder 8 temporarily. After cleaning, the alarm is canceled, ensuring normal use in the short term and providing a safe extension period for short-term extended maintenance, thus avoiding pump damage caused by untimely maintenance.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention fall within the protection scope of the present invention.

[0071] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A negative pressure self-alarm filter device, characterized in that: The negative pressure self-alarm filter device is installed upstream of the external power pump body and is used in conjunction with the power pump body. Impurities first pass through the negative pressure self-alarm filter device and then through the power pump body. The negative pressure is extracted through the operation of the power pump body. The negative pressure self-alarm filter device includes a rigid vertical cylinder, inside which a quick-release internal filter is installed, and an inlet pipe is provided on the outer wall of the rigid vertical cylinder above the quick-release internal filter. The bottom of the rigid cylinder is sealed with a bottom cover. A discharge pipe is provided on the outer side wall of the lower part of the rigid cylinder. A top cover is installed on the upper connecting flange at the top of the rigid cylinder. One side of the top cover is connected to the upper connecting flange by a lifting lug bolt. A pressure reference control component is installed at the center hole of the top cover. An output pressure component that cooperates with the pressure reference control component is installed on the lower rear side wall of the rigid cylinder. The quick-release internal filter includes a filter screen cylinder coaxially arranged with the rigid vertical cylinder. Several screen holes are provided on the bottom and outer wall surface of the filter screen cylinder. The top of the filter screen cylinder is open. An internal connecting flange is fixedly installed on the top of the filter screen cylinder. The internal connecting flange is bolted to the inner wall of the rigid vertical cylinder. The pressure reference control component includes a top air inlet pipe, and an upper tee is installed on the top of the top air inlet pipe. The two inlet ends of the upper tee are respectively connected to a reference vacuum gauge and an upper ball valve through a straight pipe, a bent pipe and a core connector. The output pressure component includes a lower tee installed on the lower rear outer side wall of the rigid vertical cylinder. An electric contact pressure gauge and a lower opening and closing regulating valve are respectively connected to the two branch pipe openings of the lower tee. When the electric contact pressure gauge reaches the set pressure, it can activate the alarm connected to it and trigger an alarm. Several pulse nozzles are fixedly installed on the inner wall of the rigid vertical cylinder outside the filter screen cylinder. Each pulse nozzle is used to spray high-pressure airflow from the outside to the inside in the radial direction to clear the blocked screen mesh on the filter screen cylinder. The pulse nozzles are connected to an external pulse air source. The jetting action of each pulse nozzle is synchronized with the action of the alarm.

2. The negative pressure self-alarm filter device according to claim 1, characterized in that: A venting pipe with a venting ball valve is provided on the lower outer wall of the rigid vertical cylinder on the side opposite to the discharge pipe. The height of the venting pipe is lower than the height of the discharge pipe.

3. The negative pressure self-alarm filter device according to claim 2, characterized in that: A sealing gasket is provided between the sealing top cover and the upper connecting flange.

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