Self-cleaning filter screen structure

Abstract

The utility model relates to the technical field of filter screen cleaning, in particular to a self-cleaning filter screen structure. The rotating assembly can drive the conical filter screen to rotate, and at least the long working side wall located at the downstream in the two oppositely-arranged long working side walls of the flow guide scraping plate is attached to the conical filter screen, so that in the rotating process of the conical filter screen, impurities filtered by the conical filter screen are covered by the flow guide scraping plate; due to the fact that water flows from the large end of the conical filter screen to the small end of the conical filter screen and the water pressure of the position, covered by the flow guide scraping plate, of the conical filter screen is smaller than that of other positions of the conical filter screen, the water flows back into the conical filter screen in the reverse direction, and then impurities attached to the conical filter screen are flushed into an area formed by the conical filter screen and the flow guide scraping plate. And in the rotating process of the conical filter screen, the flow guide scraping plate can scrape the impurities into an area formed by the conical filter screen and the flow guide scraping plate, so that the impurities can flow to the blow-off pipe under the guide of the flow guide scraping plate, and the self-cleaning efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter screen cleaning, in particular to a self-cleaning filter screen structure. Background Art

[0002] Flushing of nuclear circuit system is a prerequisite for debugging of related systems of nuclear island primary circuit. The progress and quality of flushing of related systems play an important role in the entire debugging cycle. After the installation of some large-diameter pipes and systems (such as equipment cooling water system, normal waste heat removal system, etc.), the system is circulated and flushed using the closed circuit formed. Temporary conical filters are installed at the inlet of pumps or equipment in the system to remove foreign matter or solid impurities and avoid damage to formal equipment such as water pumps and heat exchangers. The conical filters currently used for flushing of nuclear circuit systems have a simple structure, are fixed by pipe flanges, and have no self-cleaning function.

[0003] Each time the system is started and flushed for a period of time, the conical filter will be completely blocked by foreign matter or solid impurities in the system. At this time, the system needs to be shut down, the pipeline flange bolts removed, and the conical filter taken out for manual cleaning. After cleaning, the conical filter and related pipelines need to be reinstalled. The whole process is time-consuming and labor-intensive, and the frequent cleaning of the filter dismembers the entire nuclear circuit flushing work into a non-continuous operation state, which seriously restricts the normal and continuous flushing of the nuclear circuit system.

[0004] Therefore, a self-cleaning filter structure is urgently needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a self-cleaning filter screen structure, which can self-clean the conical filter screen and ensure the continuity of nuclear circuit flushing work.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Self-cleaning filter structure, including:

[0008] A conical filter screen is arranged in the pipeline, and the conical filter screen is used to filter the flushing water;

[0009] A rotating assembly, the rotating assembly is connected to the conical filter and is used to drive the conical filter to rotate along the central axis of the pipeline;

[0010] A guide scraper is arranged in the conical filter screen, the guide scraper has two long working side walls arranged opposite to each other, and along the rotation direction of the conical filter screen, at least the long working side wall located downstream is arranged in contact with the inner wall of the conical filter screen;

[0011] A sewage pipe, one end of which is connected to the small end of the conical filter screen, and the area surrounded by the guide scraper and the conical filter screen is connected to the sewage pipe to guide impurities into the sewage pipe.

[0012] As a preferred technical solution of the above-mentioned self-cleaning filter structure, the other end of the sewage pipe passes through the pipeline.

[0013] As a preferred technical solution of the above-mentioned self-cleaning filter structure, a pneumatic drain valve is provided at the other end of the drain pipe.

[0014] As an optimal technical solution for the above-mentioned self-cleaning filter structure, the rotating assembly includes a limiting cylinder, a first bevel gear, a second bevel gear and a motor, bearings are respectively provided at both ends of the limiting cylinder, the bearing is sleeved on one end of the sewage pipe and embedded in the first bevel gear, the limiting cylinder is sleeved on one end of the sewage pipe and penetrated into the first bevel gear, the guide scraper extends into the first bevel gear and is connected with the sewage pipe, the small end of the conical filter is fixedly connected to the first bevel gear, the second bevel gear is connected to the output shaft of the motor, the first bevel gear is meshed with the second bevel gear, the motor is arranged outside the pipeline, and the limiting cylinder, the first bevel gear and the second bevel gear are all arranged in the pipeline.

[0015] As a preferred technical solution of the above-mentioned self-cleaning filter structure, the output shaft of the motor is connected to the second bevel gear through a transmission shaft.

[0016] As a preferred technical solution of the above-mentioned self-cleaning filter structure, the rotating assembly also includes a handwheel, and the handwheel is fixedly arranged at one end of the main body of the motor away from the output shaft.

[0017] As a preferred technical solution of the above self-cleaning filter structure, the guide scraper is welded to the sewage pipe.

[0018] As a preferred technical solution of the above-mentioned self-cleaning filter structure, the guide scraper includes an arc plate and a guide tube, the guide tube is at least partially arranged in the area surrounded by the conical filter, and one end of the guide tube is connected to the sewage pipe, the arc plate is arranged in the area surrounded by the conical filter and connected to the other end of the guide tube, the long working side wall is arranged on opposite sides of the arc plate, and the arc plate extends along the length direction of the conical filter.

[0019] As a preferred technical solution of the above self-cleaning filter structure, it also includes a timer, and the timer is electrically connected to the motor.

[0020] As an optimal technical solution of the above-mentioned self-cleaning filter structure, it also includes a differential pressure transmitter, one end of the pressure-inducing pipe of the differential pressure transmitter collects water upstream of the conical filter, and the other end collects water downstream of the conical filter.

[0021] The utility model has at least the following beneficial effects:

[0022] The rotating assembly can drive the cone filter to rotate. Since at least the downstream long working side wall of the two oppositely arranged long working side walls of the guide scraper is fitted with the cone filter, the impurities filtered by the cone filter are covered by the guide scraper during the rotation of the cone filter. Since the water flows from the large end to the small end of the cone filter, the water flows out through the mesh of the cone filter, and the water pressure at the position of the cone filter covered by the guide scraper is lower than the water pressure at other positions of the cone filter. In this way, the water flowing out from the mesh of the cone filter will flow into the area formed by the cone filter and the guide scraper. The water pressure flowing out through the mesh is greater than the water pressure in the area formed by the conical filter and the guide scraper, so that the water will flow back into the conical filter, and then flush the impurities attached to the conical filter into the area formed by the conical filter and the guide scraper, thereby achieving the purpose of self-cleaning. At least the long working side wall of the guide scraper located downstream is fitted with the conical filter. During the rotation of the conical filter, the guide scraper will also scrape the impurities into the area formed by the conical filter and the guide scraper, so that the impurities can flow to the sewage pipe under the guidance of the guide scraper, further improving the efficiency of self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of a state in which the self-cleaning filter structure provided by an embodiment of the utility model is arranged on a pipeline;

[0025] Figure 2 for Figure 1 Side view of

[0026] Figure 3 for Figure 2 Section view at AA;

[0027] Figure 4 A schematic structural diagram of a guide scraper provided in an embodiment of the utility model.

[0028] In the figure:

[0029] 1. Conical filter; 2. Rotating assembly; 21. Limiting cylinder; 22. First bevel gear; 23. Second bevel gear; 24. Motor; 25. Transmission shaft; 26. Hand wheel; 3. Guide scraper; 31. Arc plate; 32. Guide pipe; 33. Baffle; 4. Drain pipe; 5. Pneumatic drain valve; 6. Pressure pipe; 100. Pipeline. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The embodiment of the utility model provides a self-cleaning filter screen structure, which can achieve self-cleaning and ensure continuous operation during nuclear circuit flushing.

[0035] like Figures 1 to 3 As shown, the self-cleaning filter structure includes a conical filter 1, a rotating assembly 2, a guide scraper 3 and a drain pipe 4, the conical filter 1 is used to filter the nuclear circuit flushing water, and the conical filter 1 is arranged in the pipeline 100 of the nuclear circuit; the rotating assembly 2 is connected to the conical filter 1 and is used to drive the conical filter 1 to rotate along the central axis of the pipeline 100; the guide scraper 3 is arranged in the conical filter 1, and the guide scraper 3 has two oppositely arranged long working side walls, along the rotation direction of the conical filter 1, at least the long working side wall located downstream is arranged in contact with the inner wall of the conical filter 1; one end of the drain pipe 4 is connected to the small end of the conical filter 1, and the area enclosed by the guide scraper 3 and the conical filter 1 is connected to the drain pipe 4 to guide impurities into the drain pipe 4.

[0036] The rotating assembly 2 can drive the conical filter 1 to rotate. Since at least the downstream long working side wall of the two oppositely arranged long working side walls of the guide scraper 3 is arranged in close contact with the conical filter 1, during the rotation of the conical filter 1, the impurities filtered by the conical filter 1 are covered by the guide scraper 3. Since the water flows from the large end to the small end of the conical filter 1, the water flows out through the mesh of the conical filter 1, and the water pressure at the position of the conical filter 1 covered by the guide scraper 3 is lower than the water pressure at other positions of the conical filter 1. In this way, the water flowing out from the mesh of the conical filter 1 will flow into the area formed by the conical filter 1 and the guide scraper 3. The water pressure flowing out through the mesh is greater than the water pressure in the area formed by the conical filter 1 and the guide scraper 3, so that the water will flow back into the conical filter 1, and then the impurities attached to the conical filter 1 will be flushed into the area formed by the conical filter 1 and the guide scraper 3, so as to achieve the purpose of self-cleaning. At least the long working side wall of the guide scraper 3 located downstream is arranged in close contact with the conical filter 1. When the conical filter 1 rotates, the guide scraper 3 will also scrape the impurities into the area formed by the conical filter 1 and the guide scraper 3, so that the impurities can flow to the sewage pipe 4 under the guidance of the guide scraper 3, so as to further improve the efficiency of self-cleaning.

[0037] In order to facilitate the drainage of water with impurities, in some embodiments, the other end of the sewage pipe 4 passes through the pipeline 100 and is placed outside the pipeline 100. It can be understood that the sewage pipe 4 can be L-shaped, which is convenient for passing through the pipeline 100, reducing the overall length of the sewage pipe 4, and facilitating the outflow of impurities.

[0038] Furthermore, the other end of the drain pipe 4 extending out of the pipe 100 is provided with a pneumatic drain valve 5. The pneumatic drain valve 5 can provide power for impurities to flow out of the drain pipe 4, thereby preventing impurities from accumulating and remaining in the drain pipe 4. The pneumatic drain valve 5 can also prevent the filter core loop flushing water from flowing out of the pipe 100 through the drain pipe 4 when it is not self-cleaning.

[0039] Specifically, Figure 3As shown, the rotating assembly 2 includes a limiting cylinder 21, a first bevel gear 22, a second bevel gear 23 and a motor 24. The two ends of the limiting cylinder 21 are respectively provided with bearings. The bearing is sleeved on one end of the sewage pipe 4 and embedded in the first bevel gear 22. In this way, when the first bevel gear 22 rotates, the sewage pipe 4 will not rotate accordingly, ensuring that the sewage pipe 4 is stationary relative to the first bevel gear 22. The limiting cylinder 21 is used between the two bearings to limit the relative movement of the bearings. The limiting cylinder 21 is sleeved on one end of the sewage pipe 4 and embedded in the first bevel gear 22. The limiting cylinder 21 is sleeved on one end of the sewage pipe 4 and penetrated in the first bevel gear 22. The guide scraper 3 extends into the first bevel gear 22 and is connected to the sewage pipe 4. It can be understood that one end of the guide scraper 3 can be connected to the sewage pipe 4 by extending into the sewage pipe 4 in an interference fit manner, or the guide scraper 3 can be welded to the sewage pipe 4. The small end of the conical filter 1 is fixedly connected to the first bevel gear 22, so that the second bevel gear 23 is connected to the output shaft of the motor 24, and the first bevel gear 22 is meshed with the second bevel gear 23. The first bevel gear 22, driven by the second bevel gear 23, can cause the conical filter 1 fixedly connected to the first bevel gear 22 to rotate relative to the guide scraper 3. In order to make the motor 24 work stably and reduce the difficulty of assembly, in this embodiment, the motor 24 is arranged outside the pipeline 100, and the limiting cylinder 21, the first bevel gear 22 and the second bevel gear 23 are all arranged in the pipeline 100 to ensure that the conical filter 1 rotates relative to the guide scraper 3, and the impurities are guided into the sewage pipe 4 through the guide scraper 3 to be discharged.

[0040] Furthermore, the rotating assembly 2 also includes a bearing limit baffle, which is arranged on both sides of the limit cylinder 21. The bearing limit baffle and the limit cylinder 21 work together to limit the axial movement of the bearing and achieve axial limitation of the bearing.

[0041] Furthermore, the output shaft of the motor 24 is connected to the second bevel gear 23 via a transmission shaft 25 . The provision of the transmission shaft 25 can ensure the connection between the motor 24 and the second bevel gear 23 .

[0042] In some embodiments, the rotating assembly 2 further includes a hand wheel 26, which is fixedly disposed at one end of the main body of the motor 24 away from the output shaft. The hand wheel 26 can drive the output shaft of the motor 24 to rotate without using electrical energy, and can ensure that the cone filter 1 rotates in the power-off state to achieve the purpose of self-cleaning.

[0043] Preferably, the conical filter screen 1 is welded to the first bevel gear 22, and the guide scraper 3 is welded to the sewage pipe 4. Welding can ensure that the first bevel gear 22 and the conical filter screen 1 are firmly connected, and the guide scraper 3 is firmly connected to the sewage pipe 4 to prevent falling off.

[0044] In order to achieve automatic timing self-cleaning, in some embodiments, the self-cleaning filter structure also includes a timer, and the timer is electrically connected to the motor 24. The timer can set the time to drive the motor 24 to work, so as to avoid the filter being blocked due to forgetting to clean.

[0045] In some embodiments, in order to achieve intelligent self-cleaning, the self-cleaning filter structure further includes a differential pressure transmitter, one end of the pressure-inducing pipe 6 of the differential pressure transmitter collects water upstream of the conical filter 1, and the other end collects water downstream of the conical filter 1. In this way, when the differential pressure detected by the differential pressure transmitter exceeds the preset differential pressure, the controller can control the motor 24 to work, thereby achieving the purpose of automatic cleaning.

[0046] In some embodiments, Figure 4 As shown, the guide scraper 3 includes an arc plate 31 and a guide pipe 32, wherein the guide pipe 32 is at least partially arranged in the area surrounded by the conical filter 1, and one end of the guide pipe 32 is connected to the sewage pipe 4, specifically, the guide pipe 32 and the sewage pipe 4 are welded, the arc plate 31 is arranged in the area surrounded by the conical filter 1 and connected to the other end of the guide pipe 32, the long working side walls are arranged on the opposite sides of the arc plate 31, and the arc plate 31 is connected along the length direction of the conical filter 1. In this way, the arc plate 31 is used to collect impurities and guide the impurities into the guide pipe 32 when rotating, so as to prevent the impurities from dispersing and flowing out from the small end of the conical filter 1.

[0047] In some embodiments, the guide scraper 3 further includes a baffle 33, and the baffle 33 and the guide pipe 32 are respectively arranged at both ends of the arc plate 31, and the baffle 33 can prevent impurities from flowing out of the area surrounded by the arc plate 31. It should be noted that the two long working arms of the arc plate 31 are both arranged close to the conical filter 1.

[0048] In some embodiments, a slide ring is provided on the inner wall of the pipe 100 , and the slide ring can axially limit the conical filter screen 1 while ensuring the rotation of the conical filter screen 1 .

[0049] It should be noted that, in this embodiment, the operation mode of the self-cleaning filter structure can be divided into hand wheel 26 drive and motor 24 drive according to different driving mechanisms, and the motor 24 drive can be divided into manual operation and automatic operation. The self-cleaning filter structure can also realize two fully automatic operation modes such as pressure difference control and timing control through PLC, pressure difference transmitter, timer and predetermined program.

[0050] When the hand wheel 26 is used for driving, the torque is transmitted to the conical filter screen 1 by rotating the hand wheel 26, using the transmission shaft 25, the first bevel gear 22 and the second bevel gear 23. Due to the pressure difference, the foreign matter or solid impurities attached to the inner surface of the conical filter screen 1 fall off into the area formed by the conical filter screen 1 and the guide scraper 3 during the rotation process. After the pneumatic drain valve 5 is manually opened, the foreign matter or solid impurities in the system will be discharged from the system along the drain pipe 4. After the system flushing is completed, the pneumatic drain valve 5 is manually closed.

[0051] Motor 24 drive (manual operation mode): manually start the motor 24, use the motor 24 to drive the transmission shaft 25, the first bevel gear 22, the second bevel gear 23, and the conical filter 1 to rotate, manually open the pneumatic drain valve 5 to drain the sewage, and after the system flushing is completed, manually stop the motor 24 and close the pneumatic drain valve 5.

[0052] Automatic operation (pressure difference control mode): The universal pressure difference transmitter automatically detects the pressure difference signal before and after the conical filter 1. When the pressure difference of the conical filter 1 reaches the set value, the motor 24 is automatically started, and the pneumatic drain valve 5 is interlocked to open, and the conical filter 1 is rotated and drained until the pressure difference of the filter drops below the set value, and the motor 24 is automatically stopped and the pneumatic drain valve 5 is closed. This method has a high degree of automation and is particularly suitable for working conditions with poor and unstable water quality.

[0053] Automatic operation (timing control mode): In the timing control mode, the self-cleaning conical rotary filter can adjust the working cycle of the equipment according to the on-site conditions. After a period of time, the motor 24 is automatically started and the pneumatic drain valve 5 is opened in an interlock. After the rotation and drainage of the conical filter 1 are completed according to the set time, the motor 24 is automatically stopped and the pneumatic drain valve 5 is closed. It must be noted that the pressure difference control mode has a higher priority than the timing control mode. Within the pressure difference setting value (which can be set arbitrarily), the pressure difference control is prioritized for automatic cleaning.

[0054] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Self-cleaning filter structure, characterized in that: include: A conical filter (1) is arranged in the pipeline (100), and the conical filter (1) is used to filter flushing water; A rotating assembly (2), the rotating assembly (2) being connected to the conical filter (1) and used to drive the conical filter (1) to rotate along the central axis of the pipeline (100); A guide scraper (3) is arranged in the conical filter (1), the guide scraper (3) having two long working side walls arranged opposite to each other, and along the rotation direction of the conical filter (1), at least the long working side wall located downstream is arranged to fit the inner wall of the conical filter (1); A sewage pipe (4), one end of which is connected to the small end of the conical filter (1), and the area enclosed by the guide scraper (3) and the conical filter (1) is connected to the sewage pipe (4) to guide impurities into the sewage pipe (4).

2. The self-cleaning filter structure according to claim 1, characterized in that: The other end of the sewage discharge pipe (4) passes through the pipeline (100).

3. The self-cleaning filter structure according to claim 1, characterized in that: The other end of the sewage pipe (4) is provided with a pneumatic sewage valve (5).

4. The self-cleaning filter structure according to claim 1, characterized in that: The rotating assembly (2) comprises a limiting cylinder (21), a first bevel gear (22), a second bevel gear (23) and a motor (24); bearings are respectively arranged at both ends of the limiting cylinder (21); the bearings are sleeved on one end of the sewage discharge pipe (4) and embedded in the first bevel gear (22); the limiting cylinder (21) is sleeved on one end of the sewage discharge pipe (4) and penetrated in the first bevel gear (22); the guide scraper (3) extends into the first bevel gear (22) and The conical filter (1) is connected to the sewage discharge pipe (4), the small end of the conical filter screen (1) is fixedly connected to the first bevel gear (22), the second bevel gear (23) is connected to the output shaft of the motor (24), the first bevel gear (22) is meshed with the second bevel gear (23), the motor (24) is arranged outside the pipeline (100), and the limiting cylinder (21), the first bevel gear (22) and the second bevel gear (23) are all arranged inside the pipeline (100).

5. The self-cleaning filter structure according to claim 4, characterized in that: The output shaft of the motor (24) is connected to the second bevel gear (23) via a transmission shaft (25).

6. The self-cleaning filter structure according to claim 4, characterized in that: The guide scraper (3) is connected to the sewage discharge pipe (4) by welding.

7. The self-cleaning filter structure according to claim 4, characterized in that: The guide scraper (3) comprises an arc-shaped plate (31) and a guide pipe (32); the guide pipe (32) is at least partially arranged in the area surrounded by the conical filter (1), and one end of the guide pipe (32) is connected to the sewage pipe (4); the arc-shaped plate (31) is arranged in the area surrounded by the conical filter (1) and is connected to the other end of the guide pipe (32); the long working side walls are arranged on opposite sides of the arc-shaped plate (31); and the arc-shaped plate (31) extends along the length direction of the conical filter (1).

8. The self-cleaning filter structure according to claim 4, characterized in that: A timer is also included, and the timer is electrically connected to the motor (24).

9. The self-cleaning filter structure according to claim 1, characterized in that: It also comprises a differential pressure transmitter, wherein one end of a pressure-inducing pipe (6) of the differential pressure transmitter collects water upstream of the conical filter (1), and the other end collects water downstream of the conical filter (1).

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