Closed soft water cooling tower coil pipe, manufacturing method thereof and centrifugal air compressor

Abstract

The invention discloses a closed type soft water cooling tower coil pipe, a manufacturing method thereof and a centrifugal air compressor. The closed type soft water cooling tower coil pipe comprises a long sealing plate, a fixing support, a round pipe, an elbow, two U-shaped grooves and a drainage valve. A small round hole and a large round hole are formed in the U-shaped groove; the fixing support comprises a first fixing plate and a second fixing plate which are arranged in parallel, a plurality of positioning holes used for positioning and penetrating of the round pipes are formed in the corresponding positions of the first fixing plate and the second fixing plate respectively, and the round pipes can move back and forth in the central axis direction of the positioning holes. A plurality of groups of circular pipes are sequentially arranged from top to bottom, and the end parts of the same ends of two adjacent groups of circular pipes are aligned and are sequentially connected in an S shape through elbows to form a snakelike circular pipe; the second end of the uppermost group of round pipes and the first end of the lowermost group of round pipes are respectively connected with the small round holes in the U-shaped grooves in a sealing manner; the long sealing plate is connected to the opening side of the U-shaped groove in a sealed mode. Large round holes of the two U-shaped grooves are connected with inlet and outlet pipes in a sealed mode, serve as a water outlet and a water inlet respectively and are provided with drainage valves.

Description

Technical Field

[0001] The present application belongs to the technical field of steel cord production, and relates to a closed soft water cooling tower coil and a manufacturing method thereof, and a centrifugal air compressor. Background Art

[0002] At present, centrifugal air compressors use closed soft water cooling towers. Due to the working characteristics of the equipment itself and the influence of the outdoor use environment, the heat exchange coils of the cooling towers have corroded, and the circulating cooling water in the coils has continuously leaked into the external water reservoir, causing water loss. Since the pure water in the coils is in a closed circulation and is used for oil level water cooling in centrifugal air compressor positions and gas tanks, once a leak occurs, the equipment temperature will be too high and it will be unable to operate normally.

[0003] The cooling tower's internal coils are typically constructed from 0.8mm-thick brass tubes, welded in a staggered pattern. Each coil is welded to a 76mm-diameter galvanized water pipe to form a single assembly. Once the copper tubes become corroded, online repair is virtually impossible due to the limited internal clearance and the difficulty of welding. Furthermore, due to design flaws in the coils, accumulated water cannot be drained, making them susceptible to frostbite in extremely cold weather. Summary of the Invention

[0004] Purpose: In view of at least one of the above technical problems, a series of problems such as coil corrosion, leakage, and low-temperature frostbite during operation of the cooling tower are solved. This application provides a closed soft water cooling tower coil and its manufacturing method, a centrifugal air compressor, which simplifies the welding process, facilitates operation, optimizes the drainage design, etc., thereby increasing the service life of the cooling tower and reducing maintenance costs.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted in this application is: In a first aspect, a closed soft water cooling tower coil is provided, comprising a long cover plate, a fixing bracket, a round pipe, an elbow, two U-shaped grooves and a drain valve; The U-shaped groove is provided with a small circular hole for sealing connection with the end of the circular tube and a large circular hole for connecting with the inlet and outlet pipes; The fixing bracket includes a first fixing plate and a second fixing plate arranged parallel to each other, and a plurality of positioning holes for the circular tube to pass through are respectively opened at corresponding positions on the first fixing plate and the second fixing plate, and the circular tube can move back and forth along the central axis direction of the positioning hole; Multiple groups of circular tubes are arranged sequentially from top to bottom. The ends of two adjacent groups of circular tubes at the same end are aligned and sequentially connected in an S-shape through elbows to form a serpentine circular tube; the second end of the top group of circular tubes and the first end of the bottom group of circular tubes are respectively sealed with a small circular hole on a U-shaped groove; a long sealing plate is sealed with the open side of the U-shaped groove; The large circular holes of the two U-shaped grooves are sealed to connect the inlet and outlet pipes, which serve as the water outlet and water inlet respectively. Drain valves are set at the water outlet and water inlet.

[0006] In some embodiments, five groups of circular tubes are arranged in sequence from top to bottom, the first ends of the circular tubes of the first and second groups are connected by an elbow, the second ends of the circular tubes of the second and third groups are connected by an elbow, the first ends of the circular tubes of the third and fourth groups are connected by an elbow, and the second ends of the circular tubes of the fourth and fifth groups are connected by an elbow to form serpentine circular tubes, the second end of the topmost group of circular tubes is used to be sealed and connected to the small circular hole on a U-shaped groove, and the first end of the bottommost group of circular tubes is used to be sealed and connected to the small circular hole on another U-shaped groove.

[0007] In some embodiments, each group of circular tubes is divided into two upper and lower rows and arranged alternately.

[0008] In some embodiments, each group of round tubes includes 42 round tubes.

[0009] In some embodiments, the closed soft water cooling tower coils are made of 316L stainless steel.

[0010] In some embodiments, the diameter of the circular tube is 22 mm. The diameter of the inlet and outlet tubes is 76 mm.

[0011] In some embodiments, the elbow is a 180-degree elbow.

[0012] In a second aspect, a centrifugal air compressor is provided, comprising the closed soft water cooling tower coil.

[0013] In a third aspect, a method for manufacturing the closed soft water cooling tower coil is provided, comprising: S1: Use CNC sawing machine to cut 22mm diameter round tubes and 76mm diameter inlet and outlet tubes, use laser cutting machine to cut the U-shaped groove plane to unfold the plate and bend it, and prepare long cover plates; Among them, the diameter of the small circular hole on the U-shaped groove needs to increase 0.5mm based on the outer diameter of the 22mm diameter round tube; The diameter of the large circular hole can be the inner diameter of the 76mm diameter inlet and outlet pipe. In order to enable the subsequent welding operation to vertically weld the 76mm diameter inlet and outlet pipe on the U-shaped groove, the two ends of the 76mm diameter inlet and outlet pipe are flattened using a lathe, and the parallelism of the two end surfaces is ensured to facilitate welding; The length of the 22mm diameter round tube needs to be increased by 4mm on the specified length of the blanking. In order to allow the 22mm diameter round tube to pass through the small round hole of the U-shaped groove, both ends of the 22mm diameter round tube base material protrude 2mm into the inside of the U-shaped groove. The subsequent welding operation passes through the inside of the self-melting base material, without adding welding wire, which facilitates the welding operation. S2: After all the 22mm diameter round tubes inside the U-shaped groove are self-melting welded, a long cover plate is used to cover the open side of the U-shaped groove to close the U-shaped groove and perform full welding to form a closed loop; S3: Open a large circular hole at the end of the U-shaped groove, weld the inlet and outlet pipes, and install a drain valve to drain the fluid inside the coil when the cooling tower is shut down.

[0014] Beneficial effects: The closed soft water cooling tower coil and centrifugal air compressor provided by this application have the following advantages: 1. The serpentine round tube welding guides the welding by adjusting the fixed plate on the fixed bracket left and right, guiding the welding of the elbows at both ends of the round tube, which greatly reduces the difficulty of welding in limited space; 2. The copper tubes originally used were oxygen-welded to the outer surface of the galvanized tubes. Now, by improving the U-shaped slot bend, the tubes are self-melted inside the slot, solving the problem of densely packed external coils that cannot be repaired. At the same time, the fixed brackets have been improved to effectively support the coils and reduce the stress on the coil welds, greatly extending the coil life and ensuring long-term durability. 3. Add a U-shaped drain outlet and design a valve to facilitate the drainage of all the accumulated water in the coil when the equipment is shut down in winter. This also ensures that no water accumulates in the coil to prevent the pipes from being damaged by freezing in extremely cold weather. 4. By improving the coil material, it can resist the erosion of harsh environments such as various acid and alkali media. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of a closed soft water cooling tower coil according to one embodiment of the present application; Figure 2 This is a schematic structural diagram of a U-shaped groove according to an embodiment of the present application; Figure 3 Schematic diagram of the installation of a drain valve on a U-shaped groove according to one embodiment of the present application; Figure 4 Schematic diagram of the arrangement of the water outlet and water inlet on the U-shaped trough according to one embodiment of the present application; In the figure: long sealing plate 1, U-shaped groove 2, inlet and outlet pipes 3, fixed bracket 4: first fixed plate 401 and second fixed plate 402; round pipe 5, elbow 6, small round hole 7, large round hole 8, drain valve 9, water outlet 10, water inlet 11. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0017] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0018] Example 1: Figures 1 to 4 As shown, a closed soft water cooling tower coil comprises a long sealing plate 1, a fixing bracket 4, a round pipe 5, an elbow 6, two U-shaped grooves 2 and a drain valve 9; like Figure 2 As shown, the U-shaped groove 2 is provided with a small circular hole 7 for sealingly connecting with the end of the circular tube 5 and a large circular hole 8 for connecting with the inlet and outlet pipes 3; The fixing bracket 4 includes a first fixing plate 401 and a second fixing plate 402 arranged parallel to each other. A plurality of positioning holes for the circular tube 5 to pass through are respectively opened at corresponding positions on the first fixing plate 401 and the second fixing plate 402, and the circular tube 5 can move back and forth along the central axis direction of the positioning holes; like Figure 1 、 Figure 3 As shown, multiple groups of circular tubes are arranged in sequence from top to bottom, and the ends of the same end of two adjacent groups of circular tubes are aligned and sequentially connected in an S-shape through elbows 6 to form serpentine circular tubes; the second end of the topmost group of circular tubes and the first end of the bottommost group of circular tubes are respectively sealed with a small circular hole 7 on a U-shaped groove 2; the long sealing plate 1 is sealed with the opening side of the U-shaped groove 2; The large circular holes 8 of the two U-shaped grooves 2 are sealedly connected to the inlet and outlet pipes 3, which serve as the water outlet 10 and the water inlet 11 respectively. Drain valves 9 are set at the water outlet 10 and the water inlet 11.

[0019] In this embodiment, a small circular hole 7 is provided on the side of the U-shaped groove 2 facing the circular tube 5, and the other side is open for later connection and sealing via the long sealing plate 1. A large circular hole 8 is provided at the axial end of the U-shaped groove 2.

[0020] In this embodiment, five groups of circular tubes are arranged in sequence from top to bottom, the first ends of the circular tubes 5 of the first and second groups are connected by an elbow 6, the second ends of the circular tubes 5 of the second and third groups are connected by an elbow 6, the first ends of the circular tubes 5 of the third and fourth groups are connected by an elbow 6, and the second ends of the circular tubes 5 of the fourth and fifth groups are connected by an elbow 6 to form a serpentine circular tube, the second end of the topmost first group of circular tubes 5 is used to be sealed and connected to the small circular hole 7 on one U-shaped groove 2, and the first end of the bottom fifth group of circular tubes 5 is used to be sealed and connected to the small circular hole 7 on another U-shaped groove 2; Furthermore, in this embodiment, if Figures 1 to 3 As shown, each group of circular tubes is divided into two rows, upper and lower, and arranged in a staggered manner. More specifically, in this embodiment, each group of circular tubes includes 42 circular tubes.

[0021] In some embodiments, the closed soft water cooling tower coils are made of 316L stainless steel, which can resist corrosion from a variety of acidic and alkaline media.

[0022] In this embodiment, the diameter of the circular tube 5 is 22 mm. The diameter of the inlet and outlet pipes 3 is 76 mm. The elbow 6 is a 180-degree elbow.

[0023] In this application, the original product is decomposed and two 90×90 stainless steel 316L bent square tubes (wall thickness 5 mm) are used to make the U-shaped groove 2, 42 316L stainless steel round tubes with a diameter of 22 mm (wall thickness 1 mm) are used to make the round tube 5, and 168 180-degree 316L stainless steel elbows with a diameter of 22 mm (wall thickness 1 mm) are used as the elbow 6.

[0024] Due to the characteristics of the 22mm diameter round tube 5 itself, if it is welded and formed first, it will not be able to pass through the fixed plate and the bracket for assembly later. Each assembled 22mm diameter serpentine round tube is welded by 5 round tubes 5 and 4 180-degree elbows 6 to ensure that the circulating cooling water will transfer heat to the tube wall when flowing through the entire round tube, and then transfer it to the external fluid through the tube wall. The serpentine round tube increases the time for the cooling fluid to release heat, increases the heat exchange area through the curved pipe, improves the heat exchange efficiency, and effectively realizes the transfer of heat energy. Because of such a dense arrangement of serpentine round tubes, the argon arc welding gun cannot weld at all. Even if the welding operation is performed reluctantly, it is difficult to ensure its sealing. Once one of the 42 pipes after forming fails to meet the sealing standard, it cannot be reworked later and can only be scrapped. Therefore, this application proposes the following production process and additional precautions.

[0025] The production, processing and disassembly of this application is divided into seven parts: 22mm diameter round tube, 180 degree elbow, U-shaped groove, long cover plate, 76mm diameter inlet and outlet pipe, fixing plate, and fixing bracket. The specific disassembly parts are as follows: Figure 1 shown.

[0026] Example 2: Based on Example 1, this example provides a method for manufacturing the closed soft water cooling tower coil, comprising: 1: Use CNC sawing machine to cut 22mm diameter round tube and 76mm diameter inlet and outlet tube, and use laser cutting machine to cut the U-shaped groove plane to unfold the plate and bend it (such as Figure 1 As shown), long cover, notes: 1.1: The diameter of the small round hole 7 needs to be increased by 0.5mm based on the outer diameter of the 22mm diameter round tube, so that the 22mm diameter round tube can smoothly pass through the small round hole 7 of the U-shaped groove during subsequent welding operations.

[0027] 1.2: The diameter of the large circular hole 8 can be the inner diameter of the 76mm diameter inlet and outlet pipe. In order to enable the subsequent welding operation to vertically weld the 76mm diameter inlet and outlet pipe on the U-shaped groove, the two ends of the 76mm diameter inlet and outlet pipe are flattened using a lathe, while ensuring the parallelism of the two end surfaces to facilitate welding.

[0028] 1.3: The length of the 22mm diameter round tube needs to be increased by 4mm on the specified length of blanking. In order to allow the 22mm diameter round tube to protrude 2mm into the U-shaped groove when passing through the small round hole 7 of the U-shaped groove, the subsequent welding operation can pass through the inside of the self-melting base material (the outside is densely arranged due to the argon arc welding gun cannot be welded), without adding welding wire, which facilitates the welding operation.

[0029] 2: After all the 22mm diameter round tubes inside the U-shaped groove are self-melting welded, use a long cover plate to cover the open side of the U-shaped groove to close the U-shaped groove and perform full welding to form a closed loop.

[0030] 3: Open a large round hole 8 at the end of the U-shaped groove, weld the inlet and outlet pipes 3, and install a drain valve to drain the fluid inside the coil when the cooling tower is shut down to prevent freezing and cracking of the 22mm diameter round pipe (such as Figure 3 、 Figure 4 shown).

[0031] Example 3: A centrifugal air compressor comprising the closed soft water cooling tower coil described in Example 1.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A closed soft water cooling tower coil, characterized in that: Includes long cover plate, fixing bracket, round pipe, elbow, two U-shaped grooves and drain valve; The U-shaped groove is provided with a small circular hole for sealing connection with the end of the circular tube and a large circular hole for connecting with the inlet and outlet pipes; The fixing bracket includes a first fixing plate and a second fixing plate arranged parallel to each other, and a plurality of positioning holes for the circular tube to pass through are respectively opened at corresponding positions on the first fixing plate and the second fixing plate, and the circular tube can move back and forth along the central axis direction of the positioning hole; Multiple groups of circular tubes are arranged sequentially from top to bottom. The ends of two adjacent groups of circular tubes at the same end are aligned and sequentially connected in an S-shape through elbows to form a serpentine circular tube; the second end of the top group of circular tubes and the first end of the bottom group of circular tubes are respectively sealed with a small circular hole on a U-shaped groove; a long sealing plate is sealed with the open side of the U-shaped groove; The large circular holes of the two U-shaped grooves are sealed to connect the inlet and outlet pipes, which serve as the water outlet and water inlet respectively. Drain valves are set at the water outlet and water inlet.

2. The closed soft water cooling tower coil according to claim 1, characterized in that: There are five groups of round tubes arranged from top to bottom, the first ends of the round tubes in the first and second groups are connected by an elbow, the second ends of the round tubes in the second and third groups are connected by an elbow, the first ends of the round tubes in the third and fourth groups are connected by an elbow, and the second ends of the round tubes in the fourth and fifth groups are connected by an elbow to form a serpentine round tube. The second end of the topmost group of round tubes is used to be sealed and connected to the small round hole on one U-shaped groove, and the first end of the bottommost group of round tubes is used to be sealed and connected to the small round hole on another U-shaped groove.

3. The closed soft water cooling tower coil according to claim 1, characterized in that: Each group of round tubes is divided into two rows, upper and lower, and arranged alternately.

4. The closed soft water cooling tower coil according to claim 1, characterized in that: Each group of round tubes includes 42 round tubes.

5. The closed soft water cooling tower coil according to claim 1, characterized in that: The closed soft water cooling tower coils are all made of 316L stainless steel.

6. The closed soft water cooling tower coil according to claim 1, characterized in that: The diameter of the round tube is 22 mm.

7. The closed soft water cooling tower coil according to claim 1, characterized in that: The diameter of the inlet and outlet pipes is 76 mm.

8. The closed soft water cooling tower coil according to claim 1, characterized in that: The elbow is a 180-degree elbow.

9. A centrifugal air compressor, characterized in that: The closed soft water cooling tower coil comprises the closed soft water cooling tower coil according to any one of claims 1 to 8.

10. A method for manufacturing a closed soft water cooling tower coil according to any one of claims 1 to 8, characterized in that: include: S1: Use CNC sawing machine to cut 22mm diameter round tubes and 76mm diameter inlet and outlet tubes, use laser cutting machine to cut the U-shaped groove plane to unfold the plate and bend it, and prepare long cover plates; Among them, the diameter of the small circular hole on the U-shaped groove needs to increase 0.5mm based on the outer diameter of the 22mm diameter round tube; The diameter of the large circular hole can be the inner diameter of the 76mm diameter inlet and outlet pipe. In order to enable the subsequent welding operation to vertically weld the 76mm diameter inlet and outlet pipe on the U-shaped groove, the two ends of the 76mm diameter inlet and outlet pipe are flattened using a lathe, and the parallelism of the two end surfaces is ensured to facilitate welding; The length of the 22mm diameter round tube needs to be increased by 4mm on the specified length of the blanking. In order to allow the 22mm diameter round tube to pass through the small round hole of the U-shaped groove, both ends of the 22mm diameter round tube base material protrude 2mm into the inside of the U-shaped groove. The subsequent welding operation passes through the inside of the self-melting base material, without adding welding wire, which facilitates the welding operation. S2: After all the 22mm diameter round tubes inside the U-shaped groove are self-melting welded, a long cover plate is used to cover the open side of the U-shaped groove to close the U-shaped groove and perform full welding to form a closed loop; S3: Open a large circular hole at the end of the U-shaped groove, weld the inlet and outlet pipes, and install a drain valve to drain the fluid inside the coil when the cooling tower is shut down.

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