Efficient finned tube heat exchanger

Abstract

The invention discloses an efficient finned tube heat exchanger, and relates to the technical field of heat exchangers. According to the efficient finned tube heat exchanger, through cooperation of the U-shaped pipelines and the cooling fins, when liquid flows through the multiple U-shaped pipelines, the multiple cooling fins make contact with the outer surfaces of the U-shaped pipelines, the heat exchange area of the U-shaped pipelines can be increased, and the heat exchange effect of equipment is further guaranteed; the heat dissipation fins on the two sides can be separated from the corresponding U-shaped pipelines by rotating the concave side frames, the U-shaped pipelines and the heat dissipation fins can be conveniently disassembled, overhauled and cleaned, and the use effect and maintenance convenience of the equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and specifically relates to a high-efficiency finned tube heat exchanger. Background Art

[0002] The finned tube heat exchanger is one of the earliest and most successful discoveries in the process of improving tube heat transfer. This method is still the most widely used one among all various methods for enhancing heat transfer of tube heat transfer surfaces. It is not only applicable to single finned tube heat exchangers and is widely used in power, chemical, petrochemical, air conditioning engineering, and refrigeration engineering; referring to the Chinese patent with the publication number: "CN117329878B" for "A high-efficiency finned tube heat exchanger", this patent points out that when the existing finned tube heat exchanger is in use, as the liquid flows through the tube, only part of the liquid comes into contact with the inner wall of the pipe on the inner side of the finned tube heat exchanger, resulting in an unclear heat exchange effect and thus a low heat exchange efficiency; however, this device still has problems with the convenience of maintenance, resulting in poor cleaning effects of the pipes and fins, affecting the heat exchange efficiency. For this reason, we propose a high-efficiency finned tube heat exchanger to solve the above problems. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a high-efficiency finned tube heat exchanger, which solves the problems raised in the above background art.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A high-efficiency finned tube heat exchanger includes a heat exchanger body. A connection plate frame is fixedly installed on the side of the heat exchanger body. An inlet liquid pipe and a drain pipe are respectively fixedly installed on the outside of the connection plate frame. A plurality of U-shaped pipes are fixedly installed on the side of the connection plate frame close to the heat exchanger body for transporting the liquid.

[0005] Both sides of the heat exchanger body are rotatably connected with concave side frames. A positioning bolt is installed on the side of the concave side frame. Threaded holes adapted to the positioning bolts are opened at both ends of the heat exchanger body. A plurality of positioning rods are fixedly installed inside the concave side frame. A plurality of heat dissipation fins are fixedly installed on the outside of the plurality of positioning rods. The installation positions of the heat dissipation fins are located outside the U-shaped pipes and are in contact with the U-shaped pipes for heat exchange operations.

[0006] A plurality of positioning ends are slidably connected to the side of the connection plate frame. The positioning ends are used to lock the ends of the U-shaped pipes.

[0007] Preferably, a plurality of annular limiting grooves are formed inside the connecting plate frame, the positioning end is slidably installed inside the corresponding annular limiting groove, a limiting ring is slidably installed inside the annular limiting groove, a support spring is fixedly installed between the inner wall of the annular limiting groove and the limiting ring, and the limiting ring is rotatably connected to the positioning end for driving the positioning end to reset. An adapter end adapted to the positioning end is fixedly installed at the end of the U-shaped pipe.

[0008] Preferably, through the arrangement of the positioning end, when disassembling the U-shaped pipe, the positioning end can be rotated until the positioning end is separated from the adapter end. At this time, the positioning end retracts into the annular limiting groove, and then the U-shaped pipe can be disassembled and replaced. The installation is the same, which is convenient for disassembling and assembling the U-shaped pipe. Compared with the traditional U-shaped pipe, it is more convenient for maintenance.

[0009] Preferably, a plurality of arc-shaped liquid through grooves are formed inside the connecting plate frame, the arc-shaped liquid through grooves communicate with the corresponding U-shaped pipes, through holes are formed at both ends of the connecting plate frame, and the through holes communicate with the U-shaped pipes, the inlet pipe and the drain pipe respectively.

[0010] Preferably, sealing gasket rings are fixedly installed on the sides of the arc-shaped liquid through grooves and the through holes.

[0011] Preferably, the distance between two adjacent heat dissipation fins is the same and always remains parallel.

[0012] Preferably, a positioning shaft is fixedly installed at the end of the concave side frame, an outer shaft sleeve is fixedly installed on the outside of the connecting plate frame, and the positioning shaft is rotatably connected inside the corresponding outer shaft sleeve.

[0013] Preferably, a negative pressure fan is fixedly installed inside one of the concave side frames, the concave side frame communicates with the negative pressure fan, and a plurality of exhaust slots are formed inside the concave side frame.

[0014] Preferably, the inside of the concave side frame is hollow, and the opening directions of the plurality of exhaust slots are all inclined towards the U-shaped pipe.

[0015] Preferably, a plurality of end positioning screws are provided on the side of the heat exchanger body, and the end positioning screws are used to lock the corresponding U-shaped pipes.

[0016] Preferably, a plurality of threaded bushings are fixedly installed on the side of the heat exchanger body, the end positioning screws are respectively rotatably connected inside the corresponding threaded bushings, and a limit support end is rotatably connected to one end of the end positioning screw close to the U-shaped pipe, and the limit support end is used to lock the U-shaped pipe.

[0017] The present invention provides an efficient finned tube heat exchanger. Compared with the prior art, it has the following beneficial effects:

[0018] (1) In this efficient finned tube heat exchanger, through the cooperation of U-shaped pipes and heat dissipation fins, when the liquid flows through multiple U-shaped pipes, multiple heat dissipation fins contact the outer surface of the U-shaped pipes, which can increase the heat exchange area of the U-shaped pipes, further ensuring the heat exchange effect of the equipment. When the equipment needs to be maintained and cleaned, the concave side frames can be rotated, enabling the heat dissipation fins on both sides to be separated from the corresponding U-shaped pipes respectively, facilitating the disassembly, maintenance, and cleaning of the U-shaped pipes and heat dissipation fins, and improving the use effect and maintenance convenience of the equipment.

[0019] (2) In this efficient finned tube heat exchanger, through the setting of the concave side frames, during the heat exchange process of the equipment, when the negative pressure fan operates, external air can be conveyed into the concave side frames, and then blown towards multiple heat dissipation fins and U-shaped pipes through multiple exhaust notches, further improving the heat exchange effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is of the present invention Figure 1 front view structure schematic diagram;

[0022] Figure 3 is of the present invention Figure 1 explosion structure schematic diagram;

[0023] Figure 4 is of the present invention Figure 3 magnified structure schematic diagram at A in;

[0024] Figure 5 is the sectional view structure schematic diagram of the connection plate frame of the present invention;

[0025] Figure 6 is of the present invention Figure 5 magnified structure schematic diagram at B in;

[0026] Figure 7 is of the present invention Figure 5 front view structure schematic diagram;

[0027] Figure 8 is the sectional view structure schematic diagram of the concave side frame of the present invention.

[0028] In the figure: 1. Heat exchanger body; 101. Threaded hole; 2. Connecting plate frame; 201. Arc-shaped liquid passage groove; 202. Annular limiting groove; 203. Through hole; 204. Sealing gasket ring; 3. Liquid inlet pipe; 4. Liquid discharge pipe; 5. U-shaped pipe; 501. Connecting end; 6. Concave side frame; 601. Positioning shaft; 6011. Outer shaft sleeve; 602. Positioning bolt; 603. Exhaust slot; 7. Negative pressure fan; 8. Heat dissipation fins; 801. Positioning rod; 9. End positioning screw; 901. Limiting support end; 10. Threaded bushing; 11. Positioning end; 12. Limiting ring; 1201. Support spring. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1-8 , the present invention provides two technical solutions, specifically including the following embodiments:

[0031] Embodiment 1: In the embodiment of the present invention, an efficient finned tube heat exchanger includes a heat exchanger body 1. A connecting plate frame 2 is fixedly installed on the side of the heat exchanger body 1. A liquid inlet pipe 3 and a liquid discharge pipe 4 are respectively fixedly installed on the outside of the connecting plate frame 2. A plurality of U-shaped pipes 5 are fixedly installed on the side of the connecting plate frame 2 close to the heat exchanger body 1 for transporting liquid.

[0032] In the embodiment of the present invention, specifically, during use, by connecting the liquid transportation pipeline to the liquid inlet pipe 3 and the liquid discharge pipe 4, the liquid to be heat-exchanged can enter the connecting plate frame 2 through the liquid inlet pipe 3, and then flow through a plurality of U-shaped pipes 5 and be discharged through the liquid discharge pipe 4 to complete the heat exchange process.

[0033] In the embodiment of the present invention, specifically, concave side frames 6 are rotatably connected to both sides of the heat exchanger body 1. A positioning bolt 602 is installed on the side of the concave side frame 6. Threaded holes 101 adapted to the positioning bolts 602 are respectively opened at both ends of the heat exchanger body 1. A plurality of positioning rods 801 are fixedly installed inside the concave side frame 6. A plurality of heat dissipation fins 8 are fixedly installed on the outside of the plurality of positioning rods 801. The installation position of the heat dissipation fins 8 is located outside the U-shaped pipes 5 and is in contact with the U-shaped pipes 5 for heat exchange operation.

[0034] In the embodiments of the present invention, specifically, when the liquid flows through multiple U-shaped pipes 5, the heat exchange area of the U-shaped pipes 5 can be increased by contacting multiple heat dissipation fins 8 with the outer surface of the U-shaped pipes 5, further ensuring the heat exchange effect of the device; when the device needs to be maintained and cleaned, the concave side frames 6 can be rotated so that the heat dissipation fins 8 on both sides can be separated from the corresponding U-shaped pipes 5 respectively, facilitating the maintenance and cleaning of the U-shaped pipes 5 and the heat dissipation fins 8, and improving the use effect and maintenance convenience of the device;

[0035] In the embodiments of the present invention, specifically, a plurality of positioning ends 11 are slidably connected to the side surface of the connecting plate frame 2, and the positioning ends 11 are used to lock the ends of the U-shaped pipes 5;

[0036] In the embodiments of the present invention, specifically, a plurality of annular limiting grooves 202 are formed inside the connecting plate frame 2, the positioning ends 11 are slidably installed inside the corresponding annular limiting grooves 202, a limiting ring 12 is slidably installed inside the annular limiting grooves 202, a support spring 1201 is fixedly installed between the inner wall of the annular limiting grooves 202 and the limiting ring 12, and the limiting ring 12 is rotatably connected to the positioning ends 11 for driving the positioning ends 11 to reset. A connecting end 501 adapted to the positioning ends 11 is fixedly installed at the end of the U-shaped pipe 5;

[0037] In the embodiments of the present invention, specifically, through the arrangement of the positioning ends 11, when disassembling the U-shaped pipes 5, the positioning ends 11 can be rotated until the positioning ends 11 are separated from the connecting ends 501. At this time, the positioning ends 11 retract into the annular limiting grooves 202, and then the U-shaped pipes 5 can be disassembled and replaced. The installation is the same, facilitating the disassembly and assembly of the U-shaped pipes 5. Compared with the traditional U-shaped pipes 5, it is more convenient for maintenance;

[0038] In the embodiments of the present invention, specifically, a plurality of arc-shaped liquid through grooves 201 are formed inside the connecting plate frame 2, the arc-shaped liquid through grooves 201 communicate with the corresponding U-shaped pipes 5, and through holes 203 are formed at both ends of the connecting plate frame 2, and the through holes 203 communicate with the U-shaped pipes 5, the liquid inlet pipe 3 and the liquid discharge pipe 4 respectively;

[0039] In the embodiments of the present invention, specifically, when the liquid passes through the liquid inlet pipe 3, it can enter the U-shaped pipes 5 through the through holes 203, and then flow inside the multiple U-shaped pipes 5 through the arc-shaped liquid through grooves 201 until it is discharged through the through holes 203 and the liquid discharge pipe 4;

[0040] In the embodiments of the present invention, specifically, sealing gasket rings 204 are fixedly installed on the sides of the arc-shaped liquid through grooves 201 and the through holes 203, and the sealing gasket rings 204 are fixedly connected to the connecting plate frame 2, which can improve the sealing effect between the U-shaped pipes 5 and the connecting plate frame 2;

[0041] In the embodiment of the present invention, specifically, the distances between two adjacent heat dissipation fins 8 are the same and always remain parallel;

[0042] In the embodiment of the present invention, specifically, a positioning shaft 601 is fixedly installed at the end of the concave side frame 6, and an outer shaft sleeve 6011 is fixedly installed on the outer side of the connection plate frame 2. The positioning shaft 601 is rotatably connected inside the corresponding outer shaft sleeve 6011. Through the cooperation of the positioning shaft 601 and the outer shaft sleeve 6011, the concave side frame 6 can be separated from the heat exchanger body 1 by rotation, and thus it is convenient to complete the disassembly process of the heat dissipation fins 8.

[0043] Embodiment 2: Based on Embodiment 1, an efficient finned tube heat exchanger includes a heat exchanger body 1. A connection plate frame 2 is fixedly installed on the side of the heat exchanger body 1. An inlet pipe 3 and a drain pipe 4 are respectively fixedly installed on the outer side of the connection plate frame 2. A plurality of U-shaped pipes 5 are fixedly installed on the side of the connection plate frame 2 close to the heat exchanger body 1 for transporting liquid;

[0044] In the embodiment of the present invention, specifically, during use, by connecting the liquid transportation pipeline to the inlet pipe 3 and the drain pipe 4, the liquid to be heat-exchanged can enter the connection plate frame 2 through the inlet pipe 3, and then flow through a plurality of U-shaped pipes 5 and be discharged through the drain pipe 4 to complete the heat exchange process;

[0045] In the embodiment of the present invention, specifically, concave side frames 6 are rotatably connected to both sides of the heat exchanger body 1. A positioning bolt 602 is installed on the side of the concave side frame 6. Threaded holes 101 adapted to the positioning bolt 602 are respectively opened at both ends of the heat exchanger body 1. A plurality of positioning rods 801 are fixedly installed inside the concave side frame 6. A plurality of heat dissipation fins 8 are fixedly installed on the outer sides of the plurality of positioning rods 801. The installation positions of the heat dissipation fins 8 are located outside the U-shaped pipes 5 and are in contact with the U-shaped pipes 5 for heat exchange operations;

[0046] In the embodiment of the present invention, specifically, when the liquid flows through a plurality of U-shaped pipes 5, the heat exchange area of the U-shaped pipes 5 can be increased by the contact between the plurality of heat dissipation fins 8 and the outer surface of the U-shaped pipes 5, further ensuring the heat exchange effect of the equipment; when the equipment needs to be maintained and cleaned, the concave side frames 6 can be rotated so that the heat dissipation fins 8 on both sides can be separated from the corresponding U-shaped pipes 5 respectively, facilitating the maintenance and cleaning of the U-shaped pipes 5 and the heat dissipation fins 8, and improving the use effect and maintenance convenience of the equipment;

[0047] In the embodiment of the present invention, specifically, a plurality of positioning ends 11 are slidably connected to the side of the connection plate frame 2, and the positioning ends 11 are used to lock the ends of the U-shaped pipes 5;

[0048] In the embodiment of the present invention, specifically, a plurality of annular limiting grooves 202 are formed inside the connection plate frame 2. The positioning end 11 is slidably installed inside the corresponding annular limiting groove 202. A limiting ring 12 is slidably installed inside the annular limiting groove 202. A support spring 1201 is fixedly installed between the inner wall of the limiting ring 12 and the annular limiting groove 202. And the limiting ring 12 is rotatably connected to the positioning end 11 for driving the positioning end 11 to reset. The end of the U-shaped pipe 5 is fixedly installed with a connection end 501 adapted to the positioning end 11;

[0049] In the embodiment of the present invention, specifically, through the setting of the positioning end 11, when disassembling the U-shaped pipe 5, the positioning end 11 can be rotated until the positioning end 11 is separated from the connection end 501. At this time, the positioning end 11 retracts into the annular limiting groove 202. At this time, the U-shaped pipe 5 can be disassembled and replaced. The installation is the same. It is convenient to disassemble and assemble the U-shaped pipe 5. Compared with the traditional U-shaped pipe 5, it is more convenient to maintain;

[0050] In the embodiment of the present invention, specifically, a plurality of arc-shaped liquid passing grooves 201 are formed inside the connection plate frame 2. The arc-shaped liquid passing grooves 201 communicate with the corresponding U-shaped pipes 5. Through holes 203 are formed at both ends of the connection plate frame 2. The through holes 203 communicate with the U-shaped pipes 5, the liquid inlet pipe 3 and the liquid discharge pipe 4 respectively;

[0051] In the embodiment of the present invention, specifically, when the liquid passes through the liquid inlet pipe 3, it can enter the U-shaped pipe 5 through the through hole 203, and then flow inside the plurality of U-shaped pipes 5 through the arc-shaped liquid passing grooves 201 until it is discharged through the through hole 203 and the liquid discharge pipe 4;

[0052] In the embodiment of the present invention, specifically, sealing gasket rings 204 are fixedly installed on the sides of the arc-shaped liquid passing grooves 201 and the through holes 203. The sealing gasket rings 204 are fixedly connected to the connection plate frame 2, which can improve the sealing effect between the U-shaped pipe 5 and the connection plate frame 2;

[0053] In the embodiment of the present invention, specifically, the distances between adjacent two heat dissipation fins 8 are the same and always remain parallel;

[0054] In the embodiment of the present invention, specifically, a positioning shaft 601 is fixedly installed at the end of the concave side frame 6. An outer shaft sleeve 6011 is fixedly installed on the outside of the connection plate frame 2. The positioning shaft 601 is rotatably connected inside the corresponding outer shaft sleeve 6011. Through the cooperation of the positioning shaft 601 and the outer shaft sleeve 6011, the concave side frame 6 can be separated from the heat exchanger body 1 by rotation, and then it is convenient to complete the disassembly process of the heat dissipation fins 8;

[0055] In an embodiment of the present invention, further, a negative pressure fan 7 is fixedly installed inside the concave side frame 6 on one side. The concave side frame 6 is in communication with the negative pressure fan 7, and a plurality of exhaust slots 603 are formed inside the concave side frame 6;

[0056] In an embodiment of the present invention, specifically, the inside of the concave side frame 6 is hollow, and the opening directions of the plurality of exhaust slots 603 all incline towards the U-shaped pipe 5;

[0057] In an embodiment of the present invention, the negative pressure fan 7 is an existing device. When the device is performing heat exchange, through the operation of the negative pressure fan 7, the external air can be conveyed into the concave side frame 6, and then blown towards the plurality of heat dissipation fins 8 and the U-shaped pipe 5 through the plurality of exhaust slots 603, further improving the heat exchange effect of the device;

[0058] In an embodiment of the present invention, specifically, a plurality of end positioning screws 9 are provided on the side of the heat exchanger body 1, and the end positioning screws 9 are used to lock the corresponding U-shaped pipes 5;

[0059] In an embodiment of the present invention, specifically, a plurality of threaded bushings 10 are fixedly installed on the side of the heat exchanger body 1. The end positioning screws 9 are respectively rotatably connected inside the corresponding threaded bushings 10. One end of the end positioning screw 9 close to the U-shaped pipe 5 is rotatably connected with a limit support end 901, and the limit support end 901 is used to lock the U-shaped pipe 5;

[0060] In an embodiment of the present invention, specifically, after the U-shaped pipe 5 is installed, by rotating the end positioning screw 9, the limit support end 901 can be driven to translate until the limit support end 901 contacts the U-shaped pipe 5, completing the locking of the end of the U-shaped pipe 5, and further improving the assembly stability of the U-shaped pipe 5.

[0061] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0062] The above has described an embodiment of the present invention in detail, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the present invention.

Claims

1. An efficient finned tube heat exchanger, comprising a heat exchanger body (1), characterized in that: On the side of the heat exchanger body (1), a connecting plate frame (2) is fixedly installed. On the outside of the connecting plate frame (2), a liquid inlet pipe (3) and a liquid discharge pipe (4) are respectively fixedly installed. On the side of the connecting plate frame (2) close to the heat exchanger body (1), a plurality of U-shaped pipes (5) are fixedly installed for transporting liquid. On both sides of the heat exchanger body (1), concave side frames (6) are rotatably connected. On the side of the concave side frame (6), a positioning bolt (602) is installed. At both ends of the heat exchanger body (1), threaded holes (101) adapted to the positioning bolt (602) are opened. Inside the concave side frame (6), a plurality of positioning rods (801) are fixedly installed. On the outside of the plurality of positioning rods (801), a plurality of heat dissipation fins (8) are fixedly installed. The installation position of the heat dissipation fins (8) is located outside the U-shaped pipe (5) and is in contact with the U-shaped pipe (5) for heat exchange operation. A plurality of positioning ends (11) are slidably connected to the side of the connecting plate frame (2). The positioning ends (11) are used to lock the ends of the U-shaped pipes (5).

2. An efficient finned tube heat exchanger according to claim 1, characterized in that: A plurality of annular limiting grooves (202) are opened inside the connecting plate frame (2). The positioning ends (11) are slidably installed inside the corresponding annular limiting grooves (202). Inside the annular limiting grooves (202), limiting rings (12) are slidably installed. A support spring (1201) is fixedly installed between the inner wall of the annular limiting groove (202) and the limiting ring (12). And the limiting ring (12) is rotatably connected to the positioning end (11) for driving the positioning end (11) to reset. The end of the U-shaped pipe (5) is fixedly installed with a connecting end (501) adapted to the positioning end (11).

3. An efficient finned tube heat exchanger according to claim 1, characterized in that: A plurality of arc-shaped liquid passing grooves (201) are opened inside the connecting plate frame (2). The arc-shaped liquid passing grooves (201) are communicated with the corresponding U-shaped pipes (5). Through holes (203) are opened at both ends of the connecting plate frame (2). The through holes (203) are respectively communicated with the U-shaped pipes (5), the liquid inlet pipe (3) and the liquid discharge pipe (4).

4. An efficient finned tube heat exchanger according to claim 3, characterized in that: Sealing gasket rings (204) are fixedly installed on the sides of the arc-shaped liquid passing grooves (201) and the through holes (203).

5. An efficient finned tube heat exchanger according to claim 1, characterized in that: The distance between adjacent two heat dissipation fins (8) is the same and always remains parallel.

6. An efficient finned tube heat exchanger according to claim 1, characterized in that: At the end of the concave side frame (6), a positioning shaft (601) is fixedly installed. On the outside of the connecting plate frame (2), an outer shaft sleeve (6011) is fixedly installed. The positioning shaft (601) is rotatably connected inside the corresponding outer shaft sleeve (6011).

7. An efficient finned tube heat exchanger according to claim 1, characterized in that: Inside one of the concave side frames (6), a negative pressure fan (7) is fixedly installed. The concave side frame (6) is communicated with the negative pressure fan (7). A plurality of exhaust slots (603) are opened inside the concave side frame (6).

8. The high-efficiency finned tube heat exchanger according to claim 7, wherein: The inside of the concave side frame (6) is hollow. The opening directions of the plurality of exhaust slots (603) are inclined towards the U-shaped pipe (5).

9. An efficient finned tube heat exchanger according to claim 1, characterized in that: A plurality of end positioning screws (9) are provided on the side of the heat exchanger body (1), and the end positioning screws (9) are used to lock the corresponding U-shaped pipes (5).

10. The high-efficiency finned tube heat exchanger according to claim 9, characterized in that: A plurality of threaded bushings (10) are fixedly installed on the side of the heat exchanger body (1), the end positioning screws (9) are respectively rotatably connected inside the corresponding threaded bushings (10), and a limit support end (901) is rotatably connected to one end of the end positioning screw (9) close to the U-shaped pipe (5), and the limit support end (901) is used to lock the U-shaped pipe (5).

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