Filter cartridge for pit filter

Abstract

The utility model relates to a filter cartridge for a pit filter, and belongs to the technical field of pit filters. Comprising an inner cylinder and an outer cylinder, the outer cylinder is a hollow annular shell, the inner wall and the outer wall of the outer cylinder are each provided with a first through hole communicated with the interior of the outer cylinder, the inner cylinder is located in the outer cylinder, the inner cylinder and the outer cylinder are coaxially arranged, and the outer wall of the inner cylinder is provided with a second through hole communicated with the interior of the inner cylinder; an annular water inlet cavity is formed between the inner wall of the outer barrel and the outer wall of the inner barrel, the corresponding ends of the outer barrel and the inner barrel are open, and the end, close to the opening of the outer barrel, of the annular water inlet cavity is fixedly connected with an annular sealing plate. According to the utility model, the problem of low filtering efficiency of a pit filter in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to a filter cartridge for a pit filter, belonging to the technical field of pit filters. Background Art

[0002] The pit at the bottom of the reactor containment of a pressurized water reactor nuclear power plant is used to collect coolant from the primary circuit in case of major leakage. After a baseline accident such as a loss of coolant accident (LOCA) or a main steam line rupture accident (MSLB) occurs in a pressurized water reactor nuclear power plant, the coolant enters the containment pit through the rupture. The coolant will be filtered through the containment pit filter and then enter the safety injection system (RIS) and the containment spray system (EAS) through a pump device for reactor cooling to avoid serious damage to the core and overpressure in the containment.

[0003] Therefore, the containment pit filter is an important equipment of the safety system of the pressurized water reactor nuclear power plant. Its working condition under the recirculation condition directly affects the normal operation of the safety injection system and the containment spray system. After the accident, the coolant entering the containment pit is mixed with a large amount of insulation materials and other material fragments. These fragments must be filtered through the pit filter to ensure that the safety injection system and the containment spray system perform their safety functions.

[0004] At present, the power plants in operation in China basically use the original design of pit filters, which are composed of large debris racks (EAS004FD) and four filters (EAS005 / 006FI and RIS005 / 006FI). The four filters are located at the water inlets of EAS and RIS pumps, respectively, and are contained by EAS004FI in a cubic structure. The filtration area is only the side area of ​​the cube, which is very limited.

[0005] After searching, a Chinese patent with announcement number CN114177687B discloses a backwashing device and a pit filter, the technical highlights of which are: including a fluid delivery pipeline and a spray assembly; the fluid delivery pipeline is used to connect to an external cleaning medium; the spray assembly is connected to the fluid delivery pipeline and is used to spray the cleaning medium into the pit filter.

[0006] The filter with a single-cylinder structure used in the above solution still has a limited filtering area, resulting in low filtering efficiency.

[0007] Therefore, a new solution needs to be proposed to solve this problem. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a filter cartridge for a pit filter, which solves the problem of low filtering efficiency of the pit filter in the prior art.

[0009] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0010] A filter cartridge for a pit filter comprises an inner cartridge and an outer cartridge, wherein the outer cartridge is an annular shell with a hollow interior, the inner and outer walls of the outer cartridge are both provided with a first through hole communicating with the interior thereof, the inner cartridge is located inside the outer cartridge and is coaxially arranged with the outer cartridge, the outer wall of the inner cartridge is provided with a second through hole communicating with the interior thereof, an annular water inlet cavity is formed between the inner wall of the outer cartridge and the outer wall of the inner cartridge, the corresponding ends of the outer cartridge and the inner cartridge are both open, and an annular sealing plate is fixedly connected to the end of the annular water inlet cavity close to the open end of the outer cartridge.

[0011] The utility model is further configured as follows: a plurality of first support plates are arranged inside the outer cylinder, the plurality of first support plates extend axially along the outer cylinder and are evenly distributed around the circumference of the outer cylinder, and the first support plates are fixedly connected to the inner wall of the outer cylinder on both sides along the width direction thereof.

[0012] The utility model is further configured as follows: the first support plate is provided with a plurality of first water-passing grooves evenly distributed along the length direction thereof.

[0013] The utility model is further configured as follows: a plurality of second support plates are arranged inside the inner cylinder, the plurality of second support plates extend axially along the inner cylinder and are evenly distributed circumferentially around the inner cylinder, one side of the second support plate is fixedly connected to the inner wall of the inner cylinder, and the other sides of the plurality of second support plates are fixed to each other.

[0014] The utility model is further configured as follows: the second support plate is provided with a plurality of second water channels evenly distributed along the length direction thereof.

[0015] The utility model is further configured as follows: one end of each of the first supporting plates is fixedly connected with an extension plate extending toward the inner cylinder and fixedly connected to the end surface of the annular sealing plate.

[0016] The utility model is further configured as follows: a first reinforcement ring is fixedly connected to one end of the outer wall of the outer cylinder, and a second reinforcement ring is fixedly connected to the other end of the outer wall of the outer cylinder.

[0017] The utility model is further configured as follows: the inner wall of the second reinforcement ring is fixedly connected with a first reinforcement plate and a second reinforcement plate, the first reinforcement plate and the second reinforcement plate are vertically arranged and fixed to each other, wherein four extension plates are fixed to the first reinforcement plate or the second reinforcement plate, and one end of the second support plate extends out of the inner cylinder and is fixed to the first reinforcement plate or the second reinforcement plate.

[0018] The utility model is further configured as follows: one end of the second reinforcement ring is fixedly connected with a flange ring.

[0019] The utility model is further configured as follows: the outer cylinder and the other end surfaces of the inner cylinder are fixedly connected with a connecting plate extending in the radial direction.

[0020] The beneficial effects of the utility model are:

[0021] 1. By arranging the outer cylinder and the inner cylinder, the cooling water enters through the annular water inlet cavity and is filtered through the first through hole and the second through hole, thereby greatly increasing the filtering area, improving the space utilization rate and the filtering efficiency;

[0022] 2. The outer tube and the inner tube are respectively provided with a first support plate and a second support plate to strengthen the structure of the outer tube and the inner tube, thereby improving the overall service life;

[0023] 3. By respectively arranging a first reinforcement ring and a second reinforcement ring at both ends of the outer wall of the outer cylinder, the strength of the outer cylinder is improved so that the outer cylinder is not easily deformed under the action of external force;

[0024] 4. The flange ring is provided to facilitate installation and disassembly of the filter cartridge as a whole;

[0025] 5. By fixing the connecting plates at the ends of the outer tube and the inner tube, the coaxiality between the outer tube and the inner tube is improved, making the annular water inlet cavity more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] Figure 2 It is an overall sectional view of the utility model.

[0028] Figure 3 It is a schematic diagram of the overall structure of the utility model.

[0029] In the figure: 1. inner tube; 2. outer tube; 3. connecting plate; 4. annular water inlet chamber; 5. first through hole; 6. second through hole; 7. annular sealing plate; 8. first support plate; 9. first water trough; 10. extension plate; 11. second support plate; 12. second water trough; 13. first reinforcement ring; 14. second reinforcement ring; 15. flange ring; 16. first reinforcement plate; 17. second reinforcement plate. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific illustrations.

[0031] like Figure 1-Figure 3As shown, a filter cartridge for a pit filter comprises an inner cylinder 1 and an outer cylinder 2, wherein the outer cylinder 2 is an annular shell with a hollow interior, the inner cylinder 1 is located inside the outer cylinder 2 and is coaxially arranged with the outer cylinder 2, and the other end faces of the outer cylinder 2 and the inner cylinder 1 are fixedly connected with a connecting plate 3 extending in the radial direction, and the connecting plate 3 is fixed at the ends of the outer cylinder 2 and the inner cylinder 1 to improve the coaxiality between the outer cylinder 2 and the inner cylinder 1.

[0032] An annular water inlet chamber 4 is formed between the inner wall of the outer cylinder 2 and the outer wall of the inner cylinder 1. The inner wall and the outer wall of the outer cylinder 2 are both provided with a first through hole 5 connected to the interior thereof, and the outer wall of the inner cylinder 1 is provided with a second through hole 6 connected to the interior thereof. The corresponding ends of the outer cylinder 2 and the inner cylinder 1 are both open, and the other ends are both closed. An annular sealing plate 7 is fixedly connected to the open end of the annular water inlet chamber 4 close to the outer cylinder 2.

[0033] A plurality of first support plates 8 are provided inside the outer cylinder 2. The plurality of first support plates 8 extend axially along the outer cylinder 2 and are evenly distributed around the outer cylinder 2. Both sides of the first support plates 8 along the width direction are fixedly connected to the inner wall of the outer cylinder 2. The first support plates 8 are provided with a plurality of first water-passing grooves 9 evenly distributed along the length direction. One end of each of the first support plates 8 is fixedly connected to an extension plate 10 extending toward the inner cylinder 1 and fixedly connected to the end surface of the annular sealing plate 7.

[0034] A plurality of second support plates 11 are provided inside the inner cylinder 1. The plurality of second support plates 11 extend axially along the inner cylinder 1 and are evenly distributed around the inner cylinder 1. One side of the second support plate 11 is fixedly connected to the inner wall of the inner cylinder 1, and the other sides of the plurality of second support plates 11 are fixed to each other. The second support plate 11 is provided with a plurality of second water-passing grooves 12 evenly distributed along its length direction.

[0035] By respectively arranging the first support plate 8 and the second support plate 11 on the outer tube 2 and the inner tube 1 , the structure of the outer tube 2 and the inner tube 1 is strengthened to increase the overall service life.

[0036] A first reinforcement ring 13 is fixedly connected to one end of the outer wall of the outer cylinder 2, a second reinforcement ring 14 is fixedly connected to the other end of the outer wall of the outer cylinder 2, and a flange ring 15 is fixedly connected to one end of the second reinforcement ring 14. The flange ring 15 is provided to facilitate installation and removal of the filter cylinder as a whole. The first reinforcement ring 13 and the second reinforcement ring 14 are respectively provided at both ends of the outer wall of the outer cylinder 2, thereby improving the strength of the outer cylinder 2, so that the outer cylinder 2 is not easily deformed under the action of external force.

[0037] In order to further enhance the structural strength of the outer tube 2 and the inner tube 1, the inner wall of the second reinforcement ring 14 is fixedly connected with the first reinforcement plate 16 and the second reinforcement plate 17. The first reinforcement plate 16 and the second reinforcement plate 17 are vertically arranged and fixed to each other, wherein the four extension plates 10 are fixed to the first reinforcement plate 16 or the second reinforcement plate 17, and one end of the second support plate 11 extends out of the inner tube 1 and is fixed to the first reinforcement plate 16 or the second reinforcement plate 17.

[0038] The implementation principle of the utility model is:

[0039] By providing the outer cylinder 2 and the inner cylinder 1, cooling water enters through the annular water inlet cavity 4 and is filtered through the first through hole 5 and the second through hole 6, thereby greatly increasing the filtering area, improving the space utilization rate and the filtering efficiency.

[0040] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A filter cartridge for a pit filter, characterized in that: The invention comprises an inner cylinder (1) and an outer cylinder (2), wherein the outer cylinder (2) is an annular shell with a hollow interior, the inner wall and the outer wall of the outer cylinder (2) are both provided with a first through hole (5) communicating with the interior thereof, the inner cylinder (1) is located inside the outer cylinder (2) and is coaxially arranged with the outer cylinder (2), the outer wall of the inner cylinder (1) is provided with a second through hole (6) communicating with the interior thereof, an annular water inlet chamber (4) is formed between the inner wall of the outer cylinder (2) and the outer wall of the inner cylinder (1), the corresponding ends of the outer cylinder (2) and the inner cylinder (1) are both open, and an annular sealing plate (7) is fixedly connected to the end of the annular water inlet chamber (4) close to the open end of the outer cylinder (2).

2. A filter cartridge for a pit filter according to claim 1, characterized in that: A plurality of first support plates (8) are provided inside the outer cylinder (2), the plurality of first support plates (8) extending axially along the outer cylinder (2) and uniformly distributed circumferentially around the outer cylinder (2), and the first support plates (8) are respectively fixedly connected to the inner wall of the outer cylinder (2) on both sides along the width direction thereof.

3. A filter cartridge for a pit filter according to claim 2, characterized in that: The first support plate (8) is provided with a plurality of first water channels (9) evenly distributed along its length.

4. A filter cartridge for a pit filter according to claim 2, characterized in that: A plurality of second support plates (11) are provided inside the inner cylinder (1), the plurality of second support plates (11) extending axially along the inner cylinder (1) and uniformly distributed circumferentially around the inner cylinder (1), one side of the second support plate (11) being fixedly connected to the inner wall of the inner cylinder (1), and the other sides of the plurality of second support plates (11) being fixed to each other.

5. A filter cartridge for a pit filter according to claim 4, characterized in that: The second support plate (11) is provided with a plurality of second water channels (12) evenly distributed along its length direction.

6. A filter cartridge for a pit filter according to claim 4, characterized in that: One end of each of the first support plates (8) is fixedly connected to an extension plate (10) extending toward the inner cylinder (1) and fixedly connected to the end surface of the annular sealing plate (7).

7. A filter cartridge for a pit filter according to claim 6, characterized in that: A first reinforcement ring (13) is fixedly connected to one end of the outer wall of the outer cylinder (2), and a second reinforcement ring (14) is fixedly connected to the other end of the outer wall of the outer cylinder (2).

8. A filter cartridge for a pit filter according to claim 7, characterized in that: The inner wall of the second reinforcement ring (14) is fixedly connected with a first reinforcement plate (16) and a second reinforcement plate (17); the first reinforcement plate (16) and the second reinforcement plate (17) are vertically arranged and fixed to each other, wherein four extension plates (10) are fixed to the first reinforcement plate (16) or the second reinforcement plate (17); one end of the second support plate (11) extends out of the inner tube (1) and is fixed to the first reinforcement plate (16) or the second reinforcement plate (17).

9. A filter cartridge for a pit filter according to claim 8, characterized in that: One end of the second reinforcement ring (14) is fixedly connected to a flange ring (15).

10. A filter cartridge for a pit filter according to claim 1, characterized in that: The outer cylinder (2) and the other end surfaces of the inner cylinder (1) are fixedly connected with a connecting plate (3) extending in the radial direction.

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