Vacuum filter tank and vacuum pump system

Abstract

The application discloses a vacuum filter tank and a vacuum pump system. The vacuum filter tank comprises a tank body, a filter screen and a spray pipe. The tank body is provided with a vacuum air inlet and a vacuum air outlet. The filter screen is arranged in the tank body and covers the whole cross section of the tank body. The vacuum air inlet is arranged on the lower side of the filter screen, and the vacuum air outlet is arranged on the upper side of the filter screen. The spray pipe is rotatably arranged around the axis of the filter screen, and the side of the spray pipe close to the filter screen is provided with a strip-shaped nozzle. Air flow is sprayed out through the strip-shaped nozzle to clean the filter screen. The vacuum filter tank of the application is arranged to be rotatable around the axis of the filter screen. Thus, when the filter screen is blown and cleaned, the full coverage blowing and cleaning of the filter screen can be realized by controlling the rotation of the spray pipe, thereby improving the dust removal effect of the vacuum filter tank.

Description

Technical Field

[0001] This invention relates to the field of vacuum pumps, and particularly to a vacuum filter canister and a vacuum pump system. Background Technology

[0002] Vacuum pump systems are widely used in factories. However, due to the high dust levels in factory workshops, a large amount of dust is drawn into the vacuum pump equipment along with the vacuum airflow, causing contamination and malfunctions. Therefore, a filter canister needs to be installed before the vacuum airflow enters the vacuum pump equipment to filter the dust in the vacuum airflow.

[0003] Improving the dust removal efficiency of this filter canister is an urgent problem to be solved. Summary of the Invention

[0004] This invention provides a vacuum filter canister and a vacuum pump system to improve the dust removal effect.

[0005] The first aspect of the present invention provides a vacuum filter canister, comprising:

[0006] The tank body has a vacuum inlet and a vacuum outlet;

[0007] A filter screen is installed inside the tank and covers the entire cross-section of the tank. The vacuum inlet is located on the lower side of the filter screen, and the vacuum outlet is located on the upper side of the filter screen.

[0008] The nozzle is rotatably arranged around the axis of the filter screen, and a strip-shaped nozzle is provided on the side of the nozzle closest to the filter screen. Airflow is ejected through the strip-shaped nozzle to clean the filter screen.

[0009] In some embodiments, the airflow from the strip nozzle is angled relative to the axis of the filter screen so that the nozzle rotates under the reaction force of the airflow.

[0010] In some embodiments, the nozzle is positioned close to the filter screen, and there is a gap between the nozzle and the filter screen.

[0011] In some embodiments, the nozzle is located above the filter screen.

[0012] In some embodiments, the vacuum filter canister further includes a support rod extending along the axis of the filter screen and rotatably disposed on the filter screen, and a rotator connected to the support rod, with the nozzle connected to the rotator.

[0013] In some embodiments, the end of the nozzle is connected to the rotator via a flexible tube.

[0014] In some embodiments, the vacuum filter canister further includes a toothed retaining ring disposed on the inner wall of the canister and extending circumferentially along the inner wall. The toothed retaining ring is disposed on the upper side of the nozzle and includes a plurality of toothed grooves distributed circumferentially. When the nozzle is tilted upward under the reaction force of the airflow, the nozzle is embedded in the toothed grooves in the toothed retaining ring.

[0015] In some embodiments, the vacuum filter canister further includes a differential pressure gauge for detecting the pressure difference between the upper and lower sides of the filter screen and a controller. The controller is coupled to the differential pressure gauge to control the working mode of the vacuum filter canister according to the pressure difference value detected by the differential pressure gauge. When the pressure difference value is greater than or equal to a set value, the controller controls the vacuum filter canister to enter the cleaning mode; when the pressure difference value is less than the set value, the controller controls the vacuum filter canister to enter the vacuum working mode.

[0016] In some embodiments, the vacuum filter canister further includes an air pipe for supplying positive pressure air to the nozzle, a vacuum inlet pipe connected to the vacuum inlet, and a vacuum outlet pipe connected to the vacuum outlet. The controller controls the on / off state of the air pipe, the vacuum inlet pipe, and the vacuum outlet pipe according to the operating mode.

[0017] In some embodiments, the vacuum filter canister further includes a first control valve disposed on an air pipe, a second control valve disposed on a vacuum inlet pipe, and a third control valve disposed on a vacuum outlet pipe, wherein the controller is coupled to the first control valve, the second control valve, and the third control valve.

[0018] In some embodiments, the vacuum filter canister also includes a dust discharge pipe connected to the bottom of the canister.

[0019] A second aspect of the present invention provides a vacuum pump system, including a vacuum pump and the aforementioned vacuum filter canister, wherein the vacuum filter canister is disposed upstream of the vacuum pump to filter and remove dust from the vacuum airflow entering the vacuum pump.

[0020] Based on the technical solution provided by this invention, a vacuum filter canister includes a canister body, a filter screen, and a nozzle. The canister body has a vacuum inlet and a vacuum outlet. The filter screen is disposed inside the canister body and covers the entire cross-section of the canister body. The vacuum inlet is located on the lower side of the filter screen, and the vacuum outlet is located on the upper side of the filter screen. The nozzle is rotatably arranged around the axis of the filter screen, and a strip-shaped nozzle is provided on the side of the nozzle closest to the filter screen. Airflow is ejected through the strip-shaped nozzle to clean the filter screen. In this invention, the vacuum filter canister uses a nozzle that is rotatable around the axis of the filter screen. Thus, when cleaning and dusting the filter screen, the nozzle rotation can be controlled to achieve full coverage cleaning of the filter screen, thereby improving the dust removal effect of the vacuum filter canister.

[0021] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the vacuum filter tank according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A detailed structural diagram of a part.

[0025] Figure 3 This is a schematic diagram of the forces acting on the nozzle according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the nozzle being stuck in the serrated groove under the action of reaction force according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the nozzle detaching from the serrated groove according to an embodiment of the present invention. Detailed Implementation

[0028] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] In related technologies, after the vacuum pump stops, positive pressure air is sprayed in reverse through nozzles onto the filter screen, blowing off the dust accumulated on the screen. However, because the nozzles are fixed and few in number, they can only back-blow the area directly in front of the nozzle. On the one hand, the area of ​​the filter screen directly in front of the nozzle is constantly back-blown, making it prone to damage. On the other hand, only the area of ​​the filter screen aligned with the nozzle is cleaned, while most other areas remain unswept, resulting in dust not being blown off in time. This leads to a continuous increase in the pressure difference across the filter screen, increasing the energy consumption of the vacuum pump system.

[0032] To address the above problems, this invention proposes a vacuum filter canister. This vacuum filter canister achieves full coverage of the filter screen by setting the nozzle to be rotatable around the axis of the filter screen, thereby improving the dust removal effect of the vacuum filter canister.

[0033] refer to Figure 1 This invention provides a vacuum filter canister. The vacuum filter canister includes a canister body 1, a filter screen 10, and a nozzle 8. The canister body 1 has a vacuum inlet and a vacuum outlet. The filter screen 10 is disposed inside the canister body 1 and covers the entire cross-section of the canister body 1. The vacuum inlet is located on the lower side of the filter screen 10, and the vacuum outlet is located on the upper side of the filter screen 10. The nozzle 8 is rotatably disposed about the axis of the filter screen 10, and the nozzle 8 extends outward along the surface of the filter screen 10. A strip-shaped nozzle 21 is provided on the side of the nozzle 8 closest to the filter screen 10, and airflow is ejected through the strip-shaped nozzle 21 to clean the filter screen 10.

[0034] In this embodiment of the invention, the vacuum filter canister has a nozzle 8 that is rotatable around the axis of the filter screen 10. This allows for full coverage cleaning of the filter screen by controlling the rotation of the nozzle 8 during dust removal, thereby improving the dust removal effect of the vacuum filter canister.

[0035] The first end of the nozzle 8 is rotatably connected to the axis of the filter screen 10. The nozzle 8 extends outward along the surface of the filter screen 10 so that the second end of the nozzle 8 is located at the edge of the filter screen 10. In other words, the nozzle 8 itself extends from the axis of the filter screen 10 outward to the outer periphery. Furthermore, the extension direction of the strip-shaped nozzle 21 on the nozzle 8 is the same as the extension direction of the nozzle 8, thereby achieving comprehensive purging of the filter screen 10 from the center to the outer periphery. For example, if the filter screen 10 is circular, the nozzle 8 can extend radially along the filter screen 10. Of course, the shape of the nozzle 8 can be straight or curved, as long as its strip-shaped nozzle can extend from the center of the filter screen 10 to the circumferential edge to achieve comprehensive purging in the radial direction.

[0036] exist Figure 1 In this embodiment, the axis of the filter screen 10 is coaxial with the axis of the tank body 1, and the filter screen 10 covers the entire cross-section of the tank body 1, with an area equal to the cross-sectional area of ​​the tank body 10. Of course, in other embodiments not shown in the figures, the axis of the filter screen 10 may also be inclined relative to the axis of the tank body 1. In this case, the filter screen 10 covers the entire cross-section of the tank body 1, and the area of ​​the filter screen 10 is larger than the cross-sectional area of ​​the tank body 10. In this case, the rotation axis of the nozzle 8 is still coaxial with the axis of the filter screen 10, thereby achieving complete purging of the filter screen 10.

[0037] To simplify the structure of the vacuum filter canister, the nozzle 8 in this embodiment can rotate under the reverse action of the airflow without the need for a separate dedicated drive mechanism. In some embodiments, the airflow direction ejected from the strip nozzle 21 is inclined relative to the axis of the filter screen 10 so that the nozzle 8 rotates under the reaction force of the airflow.

[0038] refer to Figure 3 The airflow ejected from the strip nozzle 21 exerts a downward force F0 on the filter screen 10. Since the filter screen 10 is clogged, the airflow, after impacting the filter screen 10, generates a reaction force on the nozzle 8 in the opposite direction to F0. This reaction force is decomposed into a vertical force F1 and a horizontal force F2. The nozzle 8 rotates under the action of the horizontal force F2. This embodiment of the invention controls the rotation of the nozzle 8 by controlling the direction of the airflow ejected from the nozzle 8. In other words, the airflow ejected from the nozzle 8 not only sweeps away dust but also drives the rotation of the nozzle 8. Eliminating the need for a dedicated drive mechanism simplifies the overall structure and saves energy.

[0039] The direction of the airflow emitted from the strip nozzle 21 is controlled by specially setting the opening position of the strip nozzle 21. Specifically, the strip nozzle 21 is set obliquely below the nozzle 8. Obliquely below means that the plane where the strip nozzle 21 is located is inclined relative to the vertical plane of the nozzle 8 axis and the strip nozzle 21 is located below the horizontal plane of the nozzle 8 axis.

[0040] Specifically, for example, the angle between the airflow ejected from the strip nozzle 21 and the plane where the filter screen 10 is located is close to 90°, for example, 85°.

[0041] To improve the dust removal effect on the filter screen 10 and to control the rotation of the nozzle 8 using the reaction force of the airflow, in some embodiments, the nozzle 8 is positioned close to the filter screen 10. Furthermore, there is a gap between the nozzle 8 and the filter screen 10. That is, the nozzle 8 is installed as close as possible to the filter screen 10, but does not touch it.

[0042] like Figure 1 As shown, the vacuum airflow enters the tank 1 through the vacuum inlet located on the lower side and exits from the tank 1 through the vacuum outlet located on the upper side. The filter screen 10 is positioned in the flow path of the vacuum airflow to filter the dust in the vacuum airflow. Therefore, dust will be deposited on the lower side of the filter screen 10. In order to back-blow the dust on the filter screen 10, in some embodiments, the nozzle 8 is located above the filter screen 10. In this way, the nozzle 8 blows the filter screen 10, that is, it blows from the leeward side to the windward side. The dust after back-blowing falls into the bottom cone of the tank 1 under its own gravity, and can then be discharged through the dust discharge pipe 19 located at the bottom of the tank 1.

[0043] In some embodiments, the vacuum filter canister further includes a support rod 15 rotatably disposed on the filter screen 10 and extending along the axis of the filter screen 10, and a rotator 9 connected to the support rod 15. A nozzle 8 is connected to the rotator 9. The support rod 15 is rotatably disposed, thereby allowing the nozzle 8 to be rotatably disposed, so that the nozzle 8 can rotate under the reaction force of the airflow.

[0044] The inventors of this invention also discovered during their research that if the nozzle 8 only rotates under the action of airflow, it may not be able to effectively clean some severely clogged parts of the filter screen 10. Therefore, it is necessary to clean the filter screen 10 according to the degree of clogging in different parts. To address this problem, in some embodiments, the vacuum filter can also include a toothed retaining ring 7 disposed on the inner wall of the can body 1 and extending circumferentially along the inner wall. The toothed retaining ring 7 is disposed on the upper side of the nozzle 8 and includes a plurality of toothed grooves distributed circumferentially. When the nozzle 8 tilts upward under the reaction force of the airflow, the end of the nozzle 8 is embedded in the toothed groove of the toothed retaining ring 7.

[0045] Specifically, the toothed retaining ring 7 has its toothed groove facing downwards, and the toothed retaining ring 7 is fixedly installed on the inner side wall of the tank body 1.

[0046] like Figure 4 As shown, when a certain part of the filter screen 10 is severely clogged, the backflushing air has poor penetration, which increases the reaction force on the nozzle 8. At this point, the vertical upward component of this reaction force is large, causing the nozzle 8 to tilt upwards relative to its connection point with the rotator 9. This causes the free end of the nozzle 8 to get stuck in the toothed groove. The nozzle 8 will then be unable to rotate due to the force exerted by the toothed groove, and the nozzle 8 will continue to backflush at this point until the filtration performance of the filter screen 10 meets the requirements, the penetration of the backflushing air increases, and the vertical component of the force on the nozzle 8 decreases. Figure 5 As shown, when the weight of the nozzle 8 is greater than the vertical component of the force, the nozzle 8 will disengage from the toothed groove. Then, under the action of the horizontal component of the force, the nozzle 8 rotates to the next backflushing section until the entire filter screen 10 completes its backflushing operation.

[0047] In some embodiments, the end of the nozzle 8 is connected to the rotator 9 via an elastic tube 22. Thus, when the nozzle 8 is subjected to a vertical reaction force, the elastic tube 22 will deform and bend, causing the free end of the nozzle 8 to tilt upwards and be caught by the toothed groove.

[0048] The elastic tube 22 can be a rubber tube.

[0049] In some embodiments, the vacuum filter canister further includes a differential pressure gauge 11 for detecting the pressure difference between the upper and lower sides of the filter screen 10 and a controller. The controller is coupled to the differential pressure gauge 11 to control the operating mode of the vacuum filter canister based on the pressure difference value detected by the differential pressure gauge 11. When the pressure difference value is greater than or equal to a set value, the controller controls the vacuum filter canister to enter a cleaning mode; when the pressure difference value is less than the set value, the controller controls the vacuum filter canister to enter a vacuum operating mode. In this way, the pressure difference between the upper and lower sides of the filter screen 10 is detected in real time by the differential pressure gauge 11, and the controller can directly and automatically control the operating mode of the vacuum filter canister based on the detected pressure difference value, thereby further improving cleaning efficiency and automation level.

[0050] In some embodiments, the vacuum filter canister further includes an air pipe 4 for supplying air to the nozzle 8, a vacuum inlet pipe 14 connected to the vacuum inlet, and a vacuum outlet pipe 6 connected to the vacuum outlet. The controller controls the on / off state of the air pipe 4, the vacuum inlet pipe 14, and the vacuum outlet pipe 6 according to the operating mode. In cleaning mode, the controller controls both the vacuum inlet pipe 14 and the vacuum outlet pipe 6 to be disconnected, and controls the air pipe 4 to be connected to supply positive pressure air to the nozzle 8 for purging. In vacuum operating mode, the controller controls the air pipe 4 to be disconnected, and controls the vacuum inlet pipe 14 and the vacuum outlet pipe 6 to be connected.

[0051] Specifically, the vacuum filter canister also includes a first control valve 3 disposed on the air pipe 4, a second control valve 13 disposed on the vacuum inlet pipe 14, and a third control valve 5 disposed on the vacuum outlet pipe 6. The controller is coupled to the first control valve 3, the second control valve 13, and the third control valve 5.

[0052] In some embodiments, the vacuum filter canister further includes a dust discharge pipe 19 connected to the bottom of the canister 1. A fourth control valve 20 is provided on the dust discharge pipe 19. In cleaning mode, the controller opens the fourth control valve 20, thereby allowing dust to be discharged through the dust discharge pipe 19 to the outside of the canister 1.

[0053] This application also provides a vacuum pump system, including a vacuum pump and the aforementioned vacuum filter canister. The vacuum filter canister is disposed upstream of the vacuum pump to filter and remove dust from the vacuum gas flow entering the vacuum pump.

[0054] The following is based on Figures 1 to 5 The structure and working process of a vacuum filter can of a specific embodiment of the present invention will be described in detail.

[0055] like Figure 1 As shown, the vacuum filter canister of this embodiment includes a canister body 1, a dust removal air delivery pipe 2, a first control valve 3, an air pipe 4, a rotator 9, a nozzle 8, a strip nozzle 21, a toothed fixing ring 7, a filter screen 10, a differential pressure gauge 11, a filter screen support 12, a support rod 15, a gasket 16, a nut 17, a vacuum inlet pipe 14, a second control valve 13, a vacuum outlet pipe 6, a third control valve 5, a dust discharge pipe 19, a fourth control valve 20, an elastic tube 22, a rotator outlet 23, an air pipe outlet 24, a bearing 25, and a mechanical seal 26.

[0056] A filter screen support 12 is installed on the inner wall of the tank body 1. The filter screen support 12 is used to support and fix the filter screen 10. Specifically, the cross-section of the tank body 1 in this embodiment is circular, and correspondingly, the filter screen support 12 is an annular support extending circumferentially along the tank body 1. In order to prevent the filter screen 10 from rotating under the action of airflow, at least two connecting members are provided on the filter screen support 12 at intervals. The at least two connecting members pass through corresponding reserved holes on the filter screen 10 to fix the filter screen 10.

[0057] The main body of tank 1 is cylindrical and made of steel. The bottom of tank 1 is conical.

[0058] Specifically, the filter screen is a plate filter with its outer frame fitted to the inner wall of the tank 1. A filter screen support is installed around the inner wall of the tank 1, which serves two purposes: supporting the filter screen and sealing the gaps between the filter screen and the inner wall of the tank, reducing the flow of unfiltered air through these gaps.

[0059] The vacuum inlet pipe 14 is installed on the lower side of the filter screen 10, and a second control valve 13 is installed on the vacuum inlet pipe 14. The vacuum outlet pipe 6 is installed on the upper side of the filter screen 10, and a third control valve 5 is installed on the vacuum outlet pipe 6.

[0060] The differential pressure gauge 11 is used to detect the pressure difference between the upper and lower sides of the filter screen 10 in real time. When the vacuum pump is running normally, if the pressure difference exceeds the set value, such as 300Pa, the vacuum pump is stopped, and the dust removal air delivery pipe 2 delivers dust removal airflow into the nozzle 8, thereby automatically starting the back-blowing and purging of the filter screen 10.

[0061] The dust removal air delivery pipe 2 is connected to the air pipe 4, and the air pipe 4 is connected to the rotator 9. The rotator 9 is connected to the nozzle 8. In this way, the dust removal air enters the nozzle 8 sequentially through the dust removal air delivery pipe 2, the air pipe 4, and the rotator 9, and is ejected through the strip-shaped nozzle of the nozzle 8. In some embodiments, the air pipe 4 is a steel pipe, and its upper end is fixedly connected to the tank body 1, specifically, for example, by welding or threading. The lower end of the air pipe 4 is connected to the rotator 9. The air pipe 4 serves as a compressed air flow channel and also supports and fixes the rotator 9 and the support rod 15.

[0062] The rotator 9 is a hollow cylinder, and its axis is connected to the air pipe 4 through a mechanical seal and bearings. As a sealed cavity that can rotate freely around the air pipe 4, the rotator 9 supports the rotation of the elastic tube 22 and the nozzle 8 on the one hand; on the other hand, it serves as an airflow channel to deliver air from the air pipe to the elastic tube.

[0063] A support rod 15 is connected to the lower end of the rotator 9. The support rod 15 passes through the filter screen 10, and a nut 17 is threadedly connected to the support rod 15. The support rod 15 is connected to the filter screen 10 through a washer 16 and a nut 17, providing support for the center of the filter screen 10 and ensuring that the filter screen 10 does not deform or sag due to its own weight or the backflow of positive pressure air. Furthermore, the nut 17 and washer 16 prevent the filter screen 10 from moving up and down. However, the nut 17 cannot be tightened to ensure that the rotator 9 can rotate freely.

[0064] like Figure 2As shown, the upper end face of the rotator 9 is connected to the air pipe 4 via a mechanical seal 26. The lower end face of the rotator 9 is connected to the air pipe 4 via a bearing 25. Neither the bearing 25 nor the air pipe 4 penetrates the lower end face of the rotator 9 to ensure the airtightness of the rotator 9. The outer ring of the bearing 25 is fixed to the lower end face of the rotator 9. The inner ring of the bearing 24 is connected to the outer wall of the air pipe 4. An air outlet 24 is provided on the portion of the air pipe 4 located inside the rotator 9. Air from the air pipe 4 enters the rotator 9 through the air outlet 24, and then flows into the nozzle 8 through the rotator outlet 23 located on the side of the rotator 9.

[0065] The nozzle 8 is connected to the rotator outlet 23 on the side of the rotator 9 via an elastic tube 22. The elastic tube 22 is a highly elastic tube, and the nozzle 8 has a strip-shaped nozzle 21, the length of which is close to the radius of the circular filter screen 10.

[0066] On the inner wall of the tank 1, a toothed retaining ring 7 with its toothed grooves facing downwards is adhered and installed. The toothed retaining ring 7 includes multiple toothed grooves on its lower side. Each toothed groove along the rotation direction of the nozzle 8 includes an upwardly inclined section and a downwardly vertical section. The horizontal projection length of each upwardly inclined section is consistent with the arc length of each rotation of the free end of the nozzle, that is, consistent with the arc length of the circumference of the filter screen 10 corresponding to the maximum arc of the cleaning airflow blown out by the strip nozzle. The height of the downwardly vertical section is such that the nozzle can rotate freely when the filter screen meets the cleaning requirements, and can hold the nozzle in place when it is clogged.

[0067] Furthermore, the elastic tube 22 is made of rubber and plastic, making it relatively easy to bend and fully recover its original shape. By adjusting the material of the elastic tube, or adjusting the length of the elastic tube, or adjusting the installation height and depth of the toothed groove, the vertical upward reaction force generated by the backflushing of the strip nozzle when the filter screen is clogged can be achieved, causing the elastic tube to bend and the nozzle to be locked into the toothed groove. After the filter screen is cleaned, the nozzle detaches from the toothed groove.

[0068] When the vacuum pump stops and the filter screen is back-blown, the second control valve 13 on the vacuum inlet pipe 14 is closed, the third control valve 5 on the vacuum outlet pipe 6 is closed, the fourth control valve 20 on the dust discharge pipe 19 is opened, and the first control valve 3 on the dust removal air delivery pipe 2 is opened. In this way, positive pressure air enters the nozzle 8 through the air pipe 4, the air pipe outlet 24, the rotator 9, the rotator outlet 23, and the elastic pipe 22, and back-blown the filter screen 10 through the strip nozzle 21.

[0069] When a part of the filter screen becomes severely clogged, the filtration pressure difference increases, and the reaction force of the backflushing also increases, resulting in a greater upward vertical force on the nozzle 8. The elastic tube 22 will bend upward, causing the nozzle 8 to rotate upward and become lodged in the toothed groove. The nozzle will pause at this position and continue backflushing until the filter screen meets the requirements. At this point, the reaction force of the backflushing decreases, the bending of the elastic tube decreases, the upward rotation angle of the nozzle decreases, and it disengages from the toothed groove. Under the action of the horizontal component force, the nozzle rotates to the next part for backflushing.

[0070] The strip-shaped nozzle 21 is a narrow slit nozzle arranged along the length of the nozzle 8. The length of the strip-shaped nozzle 21 is close to the length of the nozzle, allowing the backflow airflow from the nozzle to completely cover and purge the filter screen when the nozzle 8 rotates. Adjusting the angle between the airflow from the nozzle and the filter screen allows for adjustment of the magnitude of the vertical upward reaction force on the nozzle and the horizontal reaction force that propels the nozzle to rotate around the filter screen's center, achieving a reasonable balance between these two reaction forces.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A vacuum filter canister, characterized in that, include: The tank (1) has a vacuum inlet and a vacuum outlet; A filter screen (10) is provided inside the tank (1) and covers the entire cross section of the tank (1). The vacuum inlet is provided on the lower side of the filter screen (10), and the vacuum outlet is provided on the upper side of the filter screen (10). The nozzle (8) is rotatably arranged around the axis of the filter screen (10), and a strip-shaped nozzle is provided on the side of the nozzle (8) near the filter screen (10). Airflow is ejected through the strip-shaped nozzle to clean the filter screen (10). The vacuum filter can also include a support rod (15) extending along the axis of the filter screen (10) and rotatably disposed on the filter screen (10), a rotator (9) connected to the support rod (15), and a toothed fixing ring (7) disposed on the inner wall of the can body (1) and extending circumferentially along the inner wall. The nozzle (8) is connected to the rotator (9). The toothed fixing ring (7) is disposed on the upper side of the nozzle (8) and includes a plurality of toothed grooves distributed circumferentially. When the nozzle (8) tilts upward under the reaction force of the airflow, the nozzle (8) is embedded in the toothed grooves in the toothed fixing ring (7).

2. The vacuum filter tank according to claim 1, characterized in that, The airflow from the strip nozzle is angled relative to the axis of the filter screen (10) so that the nozzle (8) rotates under the reaction force of the airflow.

3. The vacuum filter tank according to claim 1, characterized in that, The nozzle (8) is positioned close to the filter screen (10), and there is a gap between the nozzle (8) and the filter screen (10).

4. The vacuum filter tank according to claim 1, characterized in that, The nozzle (8) is located above the filter screen (10).

5. The vacuum filter canister according to claim 1, characterized in that, The end of the nozzle (8) is connected to the rotator (9) via an elastic tube (22).

6. The vacuum filter tank according to claim 1, characterized in that, The vacuum filter can also include a differential pressure gauge (11) for detecting the pressure difference between the upper and lower sides of the filter screen (10) and a controller. The controller is coupled to the differential pressure gauge (11) to control the working mode of the vacuum filter can according to the pressure difference value detected by the differential pressure gauge (11). When the pressure difference value is greater than or equal to a set value, the controller controls the vacuum filter can to enter the cleaning mode; when the pressure difference value is less than the set value, the controller controls the vacuum filter can to enter the vacuum working mode.

7. The vacuum filter tank according to claim 6, characterized in that, The vacuum filter canister also includes an air pipe (4) for supplying positive pressure air to the nozzle (8), a vacuum inlet pipe (14) connected to the vacuum inlet, and a vacuum outlet pipe (6) connected to the vacuum outlet. The controller controls the opening and closing of the air pipe (4), the vacuum inlet pipe (14), and the vacuum outlet pipe (6) according to the working mode.

8. The vacuum filter tank according to claim 7, characterized in that, The vacuum filter canister also includes a first control valve (3) disposed on the air pipe (4), a second control valve (13) disposed on the vacuum inlet pipe (14), and a third control valve (5) disposed on the vacuum outlet pipe (6). The controller is coupled to the first control valve (3), the second control valve (13), and the third control valve (5).

9. The vacuum filter tank according to claim 1, characterized in that, The vacuum filter can also include a dust discharge pipe (19) connected to the bottom of the can body.

10. A vacuum pump system, characterized in that, It includes a vacuum pump and a vacuum filter canister as described in any one of claims 1 to 9, the vacuum filter canister being disposed upstream of the vacuum pump to filter and remove dust from the vacuum airflow entering the vacuum pump.

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