Water flow relieving device and built-in refueling water tank of nuclear power station containment

Abstract

The utility model belongs to the technical field of nuclear power station containment vessels, and particularly relates to a water flow relieving device and a refueling water tank in a nuclear power station containment vessel. The water flow relieving device comprises a first buffering disc, a second buffering disc, a first elastic piece, a second elastic piece and an outer cylinder. The outer cylinder is provided with an inner space, and a water inlet hole and a water outlet hole which are communicated with the inner space; a plurality of first through holes are formed in the first buffer disc, and a plurality of second through holes are formed in the second buffer disc; the second buffer discs are slidably mounted in the internal space and are used for dividing the internal space into a first space and a second space; the water inlet hole, the first space, the second space and the water outlet hole are communicated in sequence; the first buffer disc is slidably mounted in the first space; the first elastic piece is connected with the first buffer disc and the second buffer disc; the second elastic piece abuts against the second buffer disc. In the embodiment, the water flow relieving device has a good buffering effect on water flow, and the impact force of the water flow is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power plant containments, and particularly relates to a water flow mitigation device and a refueling water storage tank built in a nuclear power plant containment. Background Technique

[0002] As a refueling water storage tank of the nuclear power plant safety system, the refueling water storage tank built in the containment is built in the containment, which can better ensure the water volume balance of the boron-containing water in the reactor building. In the event of a break accident in the containment, the water bodies such as the spray water in the containment flow back to the refueling water storage tank built in the containment, and the water volume balance can be achieved. At present, the return water filtration of the refueling water storage tank built in the containment generally adopts the retention basket filtration method, and the leaked water and spray water are filtered and then recycled.

[0003] However, the existing refueling water storage tank built in the containment has the following disadvantages: the return water flows directly into the retention basket from above, and the impact force of the return water is all absorbed by the retention basket. The retention basket needs to bear a large impact load, which not only puts higher requirements on the material and support design of the retention basket, but also affects the operation stability of the refueling water storage tank built in the containment and increases the safety risk of the refueling water storage tank built in the containment. Summary of the Utility Model

[0004] Aiming at the technical problem that the retention basket in the prior art bears a large water flow impact force, the utility model provides a water flow mitigation device and a refueling water storage tank built in a nuclear power plant containment.

[0005] In view of the above technical problems, an embodiment of the utility model provides a water flow mitigation device, which includes a first buffer plate, a second buffer plate, a first elastic member, a second elastic member and an outer cylinder; an internal space is provided on the outer cylinder, and a water inlet hole and a water outlet hole that are both communicated with the internal space; a plurality of first through holes are provided on the first buffer plate, and a plurality of second through holes are provided on the second buffer plate;

[0006] The second buffer plate is slidably installed in the internal space and is used for dividing the internal space into a first space and a second space; the water inlet hole, the first space, the second space and the water outlet hole are sequentially communicated; the first buffer plate is slidably installed in the first space;

[0007] The opposite ends of the first elastic member are respectively connected to the first buffer plate and the second buffer plate; the second elastic member is installed in the second space and abuts against the second buffer plate.

[0008] Optionally, the water flow mitigation device further includes an annular mounting plate installed in the second space, and a plurality of first grooves are annularly and spacedly distributed on the annular mounting plate; a plurality of second grooves are annularly and spacedly distributed at one end of the second buffer plate facing away from the first space;

[0009] A plurality of the second elastic members are provided, and opposite ends of the second elastic members are respectively installed in the first groove and the second groove; the second elastic members, the first groove, and the second groove are provided in a one-to-one correspondence.

[0010] Optionally, the water flow mitigation device further includes a plurality of guide posts, and second guide holes are provided on the bottom wall of the second groove; the guide posts are installed on the annular mounting plate and are slidably inserted into the second guide holes; the guide posts and the second elastic members are provided in a one-to-one correspondence.

[0011] Optionally, one end of the first buffer plate facing the second buffer plate is provided with a third groove, and one end of the second buffer plate facing the first space is provided with a fourth groove, and opposite ends of the first elastic member are respectively installed in the third groove and the fourth groove.

[0012] Optionally, the water flow mitigation device further includes a guide cylinder, and a third through hole and a plurality of fourth through holes communicating with the third through hole are provided on the guide cylinder, and the inner diameter of the third through hole is larger than the inner diameter of the fourth through hole;

[0013] A third guide hole is provided on the bottom wall of the third groove, and a fourth guide hole is provided on the bottom wall of the fourth groove; the guide cylinder is slidably inserted into the third guide hole and the fourth guide hole;

[0014] The distance between the fourth through hole and the water inlet hole is less than the distance between the third through hole and the water inlet hole.

[0015] Optionally, the first space includes a first cylindrical space, a conical space, and a second cylindrical space that are sequentially communicated. One end of the first cylindrical space away from the conical space communicates with the water inlet hole, and one end of the second cylindrical space away from the conical space communicates with the second space;

[0016] The inner hole of the first cylindrical space is larger than the inner diameter of the water inlet hole and smaller than the inner diameter of the second cylindrical space;

[0017] The first buffer plate is slidably installed in the first cylindrical space and the conical space.

[0018] Optionally, the outer cylinder includes a first cylinder body and a second cylinder body. A first flange is provided on the first cylinder body, and a second flange is provided on the second cylinder body. The first cylinder body is installed on the second cylinder body through the mutually connected first flange and the second flange;

[0019] The water inlet hole is provided on the first cylinder body, and the water outlet hole is provided on the second cylinder body; the internal space is provided between the first cylinder body and the second cylinder body.

[0020] Optionally, the inner diameter of the first through hole is larger than that of the second through hole.

[0021] Optionally, the water flow mitigation device further includes a filter installed in the second space.

[0022] Another embodiment of the present utility model further provides a refueling water storage tank built in a nuclear power plant containment, including a water pool, a water pump, a retention basket, a support plate, and the above-mentioned water flow buffer device; the support plate is arranged above the water pool, and the outer cylinder is installed on the support plate; the retention basket is installed in the water pool, and the water outlet hole communicates with the inlet of the retention basket; the inlet of the water pump communicates with the water pool, and the outlet of the water pump communicates with the water inlet hole.

[0023] In the present utility model, water flow falls onto the first buffer plate through the water inlet hole, and the water flow will impact the first buffer plate. The first buffer plate moves in the first space and compresses the first elastic member; the water flow on the first buffer plate will fall onto the second buffer plate through the first through hole, and the water flow drives the second buffer plate to move in the internal space and compress the second elastic member. The water flow on the second buffer plate will flow into the second space through the second through hole and finally flow out through the water outlet hole. In this embodiment, the first buffer plate compresses the first elastic member, and the second buffer plate compresses the second elastic member, which can reduce the kinetic energy of the water flow, and the water flow impact force flowing out through the water outlet hole is smaller.

[0024] When the water outlet hole of the outer cylinder communicates with the inlet of the retention basket, the water flow impact force flowing into the retention basket through this water flow mitigation device is smaller. Description of the Drawings

[0025] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 is a cross-sectional view of a water flow mitigation device provided by an embodiment of the present utility model;

[0027] Figure 2 is a structural schematic diagram of a water flow mitigation device provided by an embodiment of the present utility model;

[0028] Figure 3 is a partial structural schematic diagram of a water flow mitigation device provided by an embodiment of the present utility model;

[0029] Figure 4 is a structural schematic diagram of the first buffer plate of a water flow mitigation device provided by an embodiment of the present utility model;

[0030] Figure 5It is a schematic structural view of the second buffer plate of the water flow mitigation device provided by an embodiment of the present utility model;

[0031] Figure 6 It is a schematic structural view of another perspective of the second buffer plate provided by an embodiment of the present utility model;

[0032] Figure 7 It is a cross-sectional view of the guide cylinder of the water flow mitigation device provided by an embodiment of the present utility model;

[0033] Figure 8 It is a schematic view of the in-containment refueling water storage tank of a nuclear power plant provided by an embodiment of the present utility model.

[0034] The reference numerals in the specification are as follows:

[0035] 1. First buffer plate; 11. First through hole; 12. Third groove; 13. Third guide hole; 2. Second buffer plate; 21. Second through hole; 22. Second groove; 23. Second guide hole; 24. Fourth groove; 25. Fourth guide hole; 3. First elastic member; 4. Second elastic member; 5. Outer cylinder; 51. Internal space; 511. First space; 5111. First cylindrical space; 5112. Conical space; 5113. Second cylindrical space; 512. Second space; 52. Water inlet hole; 53. Water outlet hole; 54. First cylinder; 541. First flange; 55. Second cylinder; 551. Second flange; 6. Ring-shaped mounting plate; 61. First groove; 7. Guide post; 8. Guide cylinder; 81. Third through hole; 82. Fourth through hole; 101. Water pool; 102. Retention basket; 103. Support plate. Detailed implementation manners

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0038] Such as Figures 1 to 3As shown in the figure, a water flow mitigation device provided by an embodiment of the present utility model includes a first buffer plate 1, a second buffer plate 2, a first elastic member 3, a second elastic member 4, and an outer cylinder 5; an internal space 51 is provided on the outer cylinder 5, and a water inlet hole 52 and a water outlet hole 53 that are both communicated with the internal space 51; a plurality of first through holes 11 are provided on the first buffer plate 1, and a plurality of second through holes 21 are provided on the second buffer plate 2; it can be understood that the first elastic member 3 and the second elastic member 4 include but are not limited to springs, leaf springs, etc., the first buffer plate 1 is covered with the first through holes 11, and the second buffer plate 2 is covered with the second through holes 21. Preferably, the inner diameter of the first through hole 11 is greater than the inner diameter of the second through hole 21.

[0039] The second buffer plate 2 is slidably installed in the internal space 51 and is used to divide the internal space 51 into a first space 511 and a second space 512; the water inlet hole 52, the first space 511, the second space 512, and the water outlet hole 53 are sequentially communicated; the first buffer plate 1 is slidably installed in the first space 511; opposite ends of the first elastic member 3 are respectively connected to the first buffer plate 1 and the second buffer plate 2; the second elastic member 4 is installed in the second space 512 and abuts against the second buffer plate 2.

[0040] Specifically, water flow falls onto the first buffer plate 1 through the water inlet hole 52, and the water flow will impact the first buffer plate 1. The first buffer plate 1 moves in the first space 511 and compresses the first elastic member 3; the water flow on the first buffer plate 1 will fall onto the second buffer plate 2 through the first through holes 11, and the water flow drives the second buffer plate 2 to move in the internal space 51 and compress the second elastic member 4. The water flow on the second buffer plate 2 will flow into the second space 512 through the second through holes 21 and finally flow out through the water outlet hole 53. In this embodiment, the first buffer plate 1 compresses the first elastic member 3, and the second buffer plate 2 compresses the second elastic member 4, which can reduce the kinetic energy of the water flow, and the water flow impact force flowing out through the water outlet hole 53 is smaller.

[0041] When the water outlet hole 53 of the outer cylinder 5 is communicated with the inlet of the retention basket 102, the water flow impact force flowing into the retention basket 102 through this water flow mitigation device is smaller.

[0042] In one embodiment, as Figure 1 and Figures 3 to 5As shown, the water flow mitigation device further includes an annular mounting plate 6 installed in the second space 512. A plurality of first grooves 61 are annularly and spacedly distributed on the annular mounting plate 6. At one end of the second buffer plate 2 facing away from the first space 511, a plurality of second grooves 22 are annularly and spacedly distributed. Preferably, the annular mounting plate 6 and the outer cylinder 5 are integrally formed, and the number of the first grooves 61 and the second grooves 22 can be set according to actual requirements.

[0043] A plurality of the second elastic members 4 are provided. Opposite ends of the second elastic members 4 are respectively installed in the first grooves 61 and the second grooves 22. The second elastic members 4, the first grooves 61, and the second grooves 22 are arranged in one-to-one correspondence. In this embodiment, the design of the plurality of second elastic members 4 further improves the buffering force of the second buffer plate 2 on the water flow. In addition, opposite ends of the second elastic members 4 are respectively installed in the first grooves 61 and the second grooves 22, ensuring the stability of the second elastic members 4 installed between the second buffer plate 2 and the annular mounting plate 6.

[0044] In one embodiment, as Figures 3 to 5 shown, the water flow mitigation device further includes a plurality of guide posts 7. Second guide holes 23 are provided on the bottom wall of the second grooves 22. The guide posts 7 are installed on the annular mounting plate 6 and are slidably inserted into the second guide holes 23. The guide posts 7 and the second elastic members 4 are arranged in one-to-one correspondence. It can be understood that the number of the guide posts 7 is equal to the number of the second elastic members 4. One end of the guide posts 7 away from the second buffer plate 2 of the second annular plate is installed in the first grooves 61. Preferably, the second elastic members 4 are sleeved on the guide posts 7.

[0045] In this embodiment, during the movement of the second buffer plate 2 in the internal space 51, the second buffer plate 2 slides along the guide posts 7 through the second guide holes 23, thereby ensuring the stability of the second buffer plate 2 moving in the internal space 51.

[0046] In one embodiment, a first limiting portion is provided at one end of the guide posts 7 away from the annular mounting plate 6. The first limiting portion is used to limit the sliding stroke of the second buffer plate 2 along the guide posts 7.

[0047] In one embodiment, as Figure 3 、 Figure 4 and Figure 6As shown, one end of the first buffer plate 1 facing the second buffer plate 2 is provided with a third groove 12, and one end of the second buffer plate 2 facing the first space 511 is provided with a fourth groove 24. Opposite ends of the first elastic member 3 are respectively installed in the third groove 12 and the fourth groove 24. It can be understood that the third groove 12 is provided at the central position of the first buffer plate 1, and the fourth groove 24 is provided at the central position of the second buffer plate 2. In this embodiment, the first elastic member 3 can be stably installed between the first buffer plate 1 and the second buffer plate 2.

[0048] In one embodiment, as Figures 3 to 7 shown, the water flow mitigation device further includes a guide cylinder 8. The guide cylinder 8 is provided with a third through hole 81 and a plurality of fourth through holes 82 communicating with the third through hole 81. The inner diameter of the third through hole 81 is larger than the inner diameter of the fourth through hole 82. It can be understood that the third through hole 81 communicates below the fourth through hole 82.

[0049] A third guide hole 13 is provided on the bottom wall of the third groove 12, and a fourth guide hole 25 is provided on the bottom wall of the fourth groove 24. The guide cylinder 8 is slidably inserted into the third guide hole 13 and the fourth guide hole 25. The distance between the fourth through hole 82 and the water inlet hole 52 is less than the distance between the third through hole 81 and the water inlet hole 52. Preferably, the first elastic member 3 is sleeved on the guide cylinder 8.

[0050] In this embodiment, during the movement of the first buffer plate 1 and the second annular plate (the second buffer plate 2) in the internal space 51, the first buffer plate 1 slides along the guide cylinder 8 through the third guide hole 13, and the second buffer plate 2 slides along the guide cylinder 8 through the fourth guide hole 25, thereby ensuring the stability of the movement of the first buffer plate 1 and the second buffer plate 2 in the internal space 51. In addition, the design of the fourth through hole 82 and the third through hole 81 on the guide cylinder 8 enables the guide cylinder 8 not to block the flow of water in the internal space 51, ensuring the smoothness of the water flow in the internal space 51.

[0051] In one embodiment, opposite ends of the guide cylinder 8 are respectively provided with a second limiting portion and a third limiting portion. The second limiting portion is used to limit the sliding stroke of the first buffer plate 1 along the guide cylinder 8, and the third limiting portion is used to limit the sliding stroke of the second buffer plate 2 along the guide cylinder 8.

[0052] In one embodiment, as Figure 1As shown, the first space 511 includes a first cylindrical space 5111, a conical space 5112, and a second cylindrical space 5113 that are connected in sequence. One end of the first cylindrical space 5111 away from the conical space 5112 is connected to the water inlet hole 52, and one end of the second cylindrical space 5113 away from the conical space 5112 is connected to the second space 512. Understandably, the water inlet hole 52 is connected to the water outlet hole 53 through the first cylindrical space 5111, the conical space 5112, the second cylindrical space 5113, and the second space 512 in sequence.

[0053] The inner diameter of the first cylindrical space 5111 is larger than the inner diameter of the water inlet hole 52 and smaller than the inner diameter of the second cylindrical space 5113. The first buffer plate 1 is slidably installed in the first cylindrical space 5111 and the conical space 5112. Understandably, from the first cylindrical space 5111 towards the second cylindrical space 5113, the inner diameter of the conical space 5112 gradually increases.

[0054] Specifically, when the impact force of the water flow flowing into the water inlet hole 52 is small, the first buffer plate 1 moves in the first cylindrical space 5111, and the compression amount of the first elastic member 3 is small. When the impact force of the water flow flowing into the water inlet hole 52 is large, the first buffer plate 1 flows from the first cylindrical space 5111 into the conical space 5112, and the compression amount of the first elastic member 3 is large. Moreover, the water flow can not only flow into the second annular disk second buffer plate 2 through the first through hole 11, but also flow into the second annular disk second buffer plate 2 through the gap between the first buffer plate 1 and the inner side wall of the conical space 5112, thus ensuring the smoothness of the water flow in the internal space 51.

[0055] In one embodiment, as Figure 1 and Figure 2 shown, the outer cylinder 5 includes a first cylinder body 54 and a second cylinder body 55. A first flange 541 is provided on the first cylinder body 54, and a second flange 551 is provided on the second cylinder body 55. The first cylinder body 54 is installed on the second cylinder body 55 through the mutually connected first flange 541 and second flange 551. Understandably, the first flange 541 is provided on the outer wall of the first cylinder body 54, the second flange 551 is provided on the outer wall of the second cylinder body 55. A plurality of first mounting holes are annularly and spacedly distributed on the first flange 541, and a plurality of second mounting holes are annularly and spacedly distributed on the second flange 551. The first flange 541 and the second flange 551 can be connected by fixing members inserted into the first mounting holes and the second mounting holes, and the fixing members include but are not limited to bolts, screws, etc.

[0056] The water inlet hole 52 is arranged on the first cylinder 54, and the water outlet hole 53 is arranged on the second cylinder 55; the internal space 51 is arranged between the first cylinder 54 and the second cylinder 55. In this embodiment, the outer cylinder 5 includes the first cylinder 54 and the second cylinder 55, and the disassembly and assembly operation between the first cylinder 54 and the second cylinder 55 is simple, so that it is convenient to disassemble and assemble the components in the internal space 51.

[0057] In one embodiment, the water flow mitigation device further includes a filter (not shown in the figure) installed in the second space 512. It can be understood that the water flow in the second space 512 flows out through the water outlet hole 53 after being filtered by the filter, ensuring the cleanliness of the water flowing out of the water outlet hole 53.

[0058] As Figure 8 shown, another embodiment of the present utility model further provides a refueling water tank built in a nuclear power plant containment, including a water pool 101, a water pump (not shown in the figure), a retention basket 102, a support plate 103, and the above-mentioned water flow buffering device; the support plate 103 is arranged above the water pool 101, and the outer cylinder 5 is installed on the support plate 103; the retention basket 102 is installed in the water pool 101, and the water outlet hole 53 communicates with the inlet of the retention basket 102; the inlet of the water pump communicates with the water pool 101, and the outlet of the water pump communicates with the water inlet hole 52.

[0059] Specifically, when a break accident occurs in the nuclear power plant containment, the water bodies such as the spray water in the containment flow back into the water pool 101, the water pump pumps the water in the water pool 101 into the internal space 51 of the outer cylinder 5. During the process of the water flow flowing in the internal space 51, the first buffer plate 1 compresses the first elastic member 3, and the second annular plate and the second buffer plate 2 compress the second elastic member 4, which can reduce the kinetic energy of the water flow. Finally, the kinetic energy of the water flowing into the retention basket 102 through the water outlet hole 53 is small, and the water in the retention basket 102 flows back into the water pool 101 through the filter outlet on it. The refueling water tank built in the nuclear power plant containment operates stably and has high safety.

[0060] The above are only embodiments of the water flow mitigation device and the refueling water tank built in the nuclear power plant containment of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A water flow relief device, characterized in that: It includes a first buffer tray, a second buffer tray, a first elastic member, a second elastic member and an outer cylinder; the outer cylinder is provided with an internal space and a water inlet hole and a water outlet hole both connected to the internal space; the first buffer tray is provided with a plurality of first through holes, and the second buffer tray is provided with a plurality of second through holes; The second buffer tray is slidably installed in the internal space and is used to divide the internal space into a first space and a second space; the water inlet, the first space, the second space and the water outlet are connected in sequence; the first buffer tray is slidably installed in the first space; The opposite ends of the first elastic member are respectively connected to the first buffer tray and the second buffer tray; the second elastic member is installed in the second space and abuts against the second buffer tray.

2. The water flow mitigation device according to claim 1, characterized in that: The water flow relief device further comprises an annular mounting plate installed in the second space, the annular mounting plate is provided with a plurality of first grooves distributed in annular intervals; the second buffer plate is provided with a plurality of second grooves distributed in annular intervals at one end away from the first space; There are multiple second elastic members, and opposite ends of the second elastic members are respectively installed in the first groove and the second groove; the second elastic members, the first groove and the second groove are arranged in a one-to-one correspondence.

3. The water flow relief device according to claim 2, characterized in that: The water flow relief device also includes a plurality of guide columns, and a second guide hole is provided on the bottom wall of the second groove; the guide column is installed on the annular mounting plate and slidably inserted in the second guide hole; the guide column and the second elastic member are arranged in a one-to-one correspondence.

4. The water flow mitigation device according to claim 1, characterized in that: A third groove is formed at one end of the first buffer tray facing the second buffer tray, a fourth groove is formed at one end of the second buffer tray facing the first space, and opposite ends of the first elastic member are respectively installed in the third groove and the fourth groove.

5. The water flow mitigation device according to claim 4, characterized in that: The water flow relief device further comprises a guide cylinder, the guide cylinder is provided with a third through hole and a plurality of fourth through holes communicating with the third through hole, the inner diameter of the third through hole is greater than the inner diameter of the fourth through hole; A third guide hole is provided on the bottom wall of the third groove, and a fourth guide hole is provided on the bottom wall of the fourth groove; the guide cylinder is slidably inserted in the third guide hole and the fourth guide hole; The distance between the fourth through hole and the water inlet hole is smaller than the distance between the third through hole and the water inlet hole.

6. The water flow mitigation device according to claim 1, characterized in that: The first space includes a first cylindrical space, a conical space and a second cylindrical space which are connected in sequence, one end of the first cylindrical space away from the conical space is connected to the water inlet hole, and one end of the second cylindrical space away from the conical space is connected to the second space; The inner diameter of the first cylindrical space is larger than the inner diameter of the water inlet hole, and smaller than the inner diameter of the second cylindrical space; The first buffer tray is slidably installed in the first cylindrical space and the conical space.

7. The water flow mitigation device according to claim 1, characterized in that: The outer cylinder comprises a first cylinder body and a second cylinder body, the first cylinder body is provided with a first flange, the second cylinder body is provided with a second flange, and the first cylinder body is mounted on the second cylinder body through the first flange and the second flange connected to each other; The water inlet is arranged on the first cylinder, and the water outlet is arranged on the second cylinder; the internal space is arranged between the first cylinder and the second cylinder.

8. The water flow mitigation device according to claim 1, characterized in that: An inner diameter of the first through hole is greater than an inner diameter of the second through hole.

9. The water flow mitigation device according to claim 1, characterized in that: The water flow mitigation device further includes a filter installed in the second space.

10. A refueling water tank in a nuclear power plant containment, characterized in that: It comprises a water pool, a water pump, a retention basket, a support plate and the water flow buffer device according to any one of claims 1 to 9; the support plate is arranged above the water pool, and the outer cylinder is installed on the support plate; the retention basket is installed in the water pool, and the water outlet is connected to the inlet of the retention basket; the inlet of the water pump is connected to the water pool, and the outlet of the water pump is connected to the water inlet.

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