Elbow and heat exchanger thereof

Abstract

The utility model provides an elbow and a heat exchanger thereof, the elbow is used for being matched with an internal thread pipe of the heat exchanger, and the elbow comprises a pipe part; the plurality of flaring parts are connected with one another through the pipe parts; and the plurality of flaring parts are sleeved on the internal thread pipe, so that the elbow is fixed on the heat exchanger. According to the utility model, the internal thread pipe does not need to be flared and is more stable, and the process efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and more specifically, to an elbow and its heat exchanger. Background Technology

[0002] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements. It is also a key component for improving energy efficiency. Common heat exchangers typically use flared internally threaded tubes paired with elbows that lack end forming. However, because the wall thickness of a threaded tube of the same specification is thinner than that of an elbow, further flaring the internally threaded tube will reduce its wall thickness. After salt spray testing and water pressure testing, the rupture location often occurs at the root of the flared internally threaded tube. Utility Model Content

[0003] Therefore, this utility model provides an elbow and its heat exchanger, which makes the internal threaded pipe more stable without the need for flaring, while improving the efficiency of the manufacturing process.

[0004] To solve the above problems, this utility model provides an elbow for use with the internally threaded pipe of a heat exchanger. The elbow includes: a pipe section; multiple flared sections connected to each other through the pipe section; and the multiple flared sections are fitted onto the internally threaded pipe to fix the elbow to the heat exchanger.

[0005] Compared to existing technologies, the technical advantages of this solution are as follows: Compared to the common connection method of flaring the ends of internally threaded pipes without flaring, this solution adds a flared section to the pipe end without flaring the internally threaded pipe itself. This makes the internally threaded pipe more stable and reduces the risk of wall thinning, thus making the internally threaded pipe more stable when operating in the heat exchanger and improving system reliability. Furthermore, the elimination of the flaring process for internally threaded pipes leads to faster manufacturing and higher efficiency.

[0006] In one embodiment of this utility model, the inner diameter of the flared part is larger than the outer diameter of the internally threaded pipe.

[0007] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting the inner diameter of the flared part to be larger than the outer diameter of the internally threaded pipe, it is more convenient and faster to install the elbow to the internally threaded pipe, and it is more stable when the flared part is fitted onto the internally threaded pipe, thereby improving the overall stability of the elbow after connecting to the internally threaded pipe, and thus improving the overall stability and reliability of the system.

[0008] In one embodiment of this utility model, twice the single-sided clearance is defined as equal to the inner diameter minus the outer diameter, denoted as Δd, with the inner diameter as D1 and the outer diameter as D2, and Δd = (D1 - D2) / 2; the single-sided clearance of the flared part is 0.03mm~0.2mm.

[0009] Compared with existing technologies, the technical advantages of this solution are as follows: If the gap is too small, the flared part will make hard contact with the mating parts during assembly, resulting in localized stress concentration and fatigue cracking after long-term use; if the gap is too large, additional preload is required for compensation, accelerating wear. Simultaneously, this solution ensures minimum contact pressure within this range to prevent media leakage, avoids sealing failure due to excessive gap, and is compatible with assembly tolerances.

[0010] In one embodiment of this utility model, the heat exchanger is provided with a side plate, and an internally threaded tube is installed through the side plate. The height of the flared part is less than the height of the protrusion of the internally threaded tube through the side plate.

[0011] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting the height of the flared part to be smaller than that of the internally threaded pipe, it is easier to weld later. This method makes the overall installation efficiency higher, and the system more stable and reliable after installation.

[0012] In one embodiment of this utility model, the tube is semi-circular or claw-shaped.

[0013] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting the pipe part to be semi-circular or claw-shaped, the pipe part can adapt to different usage conditions, making installation more convenient, thereby making the elbow more practical and compatible, better adapting to different installation positions, and thus improving the overall installation efficiency.

[0014] This utility model also provides a heat exchanger, which is provided with elbows as described above. The heat exchanger is composed of fins, side plates, multiple internally threaded tubes and multiple elbows. The multiple elbows and multiple internally threaded tubes are connected in a one-to-one manner. The heat exchanger also includes: each internally threaded tube passes through the fins and side plates; and after each internally threaded tube passes through the side plates and fins, it is expanded and interference-fitted with the fins and side plates.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: By using an internally threaded tube that passes through the side plate and fins before expansion, an interference fit can be achieved between the tube wall and the fins and side plate, resulting in a tight fit between the tube wall and the fins and side plate, eliminating contact gaps. Simultaneously, the radial compressive stress generated by the tube expansion suppresses the relative displacement between the fins and the tube body. The plastic deformation after expansion provides a buffer for thermal expansion, preventing tensile stress between the tube body and the fins, thus improving the overall system reliability and stability.

[0016] In one embodiment of this utility model, the outer diameter of each internally threaded pipe before expansion is the same as the outer diameter of each elbow before flaring.

[0017] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting the outer diameter of the internal threaded tube before expansion to be the same as the outer diameter of the tube before flaring, the internal fluid flow rate is more stable, and it is also more convenient and stable during docking and installation, thus ensuring the stability and reliability of the heat exchanger during subsequent operation.

[0018] In one embodiment of this utility model, the multiple elbows and multiple internally threaded pipes are fixed by welding, and the welding method is high-frequency welding.

[0019] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by setting up high-frequency welding, there is no need to use welding rings. High-frequency current flows through the contact surface of the parts to generate resistance heat, and pressure is applied or not applied to connect the parts, reducing the occurrence of overheating and weld leakage in manual welding, and improving the manufacturing qualification rate.

[0020] By adopting the technical solution of this utility model, the following technical effects can be achieved:

[0021] (1) Compared with the traditional flaring of internally threaded pipes, the common connection method of not flaring the pipe end increases the stability of the internally threaded pipe by adding a flared part to the pipe end without flaring the internally threaded pipe. Moreover, not flaring reduces the risk of wall thinning, thus making the internally threaded pipe more stable when working in the heat exchanger and the system more reliable. At the same time, the internally threaded pipe does not need to be flared, which makes the process faster and more efficient.

[0022] (2) By setting the height of the flared part to be less than that of the internal threaded pipe, it is easier to weld later. This method makes the overall installation efficiency higher and the system more stable and reliable after installation. By setting the pipe part to be semi-circular or claw-shaped, the pipe part can adapt to different usage conditions, making the installation easier. This makes the elbow more practical and compatible, and can better adapt to different installation positions, thus making the overall installation efficiency higher.

[0023] (3) By setting the internally threaded tube to pass through the side plate and fins and then expanding the tube, it can be interference-fitted with the fins and side plate, so that the tube wall is tightly attached to the fins and side plate, eliminating the contact gap. At the same time, the radial compressive stress generated by the tube expansion can suppress the relative displacement between the fins and the tube body. The plastic deformation after tube expansion provides a buffer for thermal expansion, avoids tensile stress between the tube body and the fins, and improves the reliability and stability of the overall system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of an elbow provided in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100, Elbow; 110, Pipe section; 120, Flared section; 130, Inner diameter of the flared section; 140, Height of the flared section; 200, Heat exchanger; 210, Internally threaded pipe; 220, Fin; 230, Side plate; 240, Outer diameter of the internally threaded pipe; 250, Outcrop height. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] [First Embodiment]

[0031] See Figures 1-2 This utility model provides an elbow 100, which is used to cooperate with the internally threaded pipe 210 of the heat exchanger 200. The elbow 100 includes: a pipe section 110; a plurality of flared sections 120, which are connected to each other through the pipe section 110; and the plurality of flared sections 120 are sleeved on the internally threaded pipe 210, so that the elbow 100 is fixed to the heat exchanger 200.

[0032] Specifically, when assembling the heat exchanger 200, an internally threaded tube 210 is first installed. The internally threaded tube 210 can be a long U-shape. For example, the specifications of the internally threaded tube 210 can be an outer diameter of 7mm, a wall thickness of 0.23mm, and a tube spacing of 20.5mm. After the internally threaded tube 210 passes through the fins 220 and the side plate 230, the inner diameter of the internally threaded tube 210 is expanded using a tube expander to make it interference fit with the fins 220 and the side plate 230. After the tube is expanded, no further flaring process is required.

[0033] Furthermore, after assembly, elbows 100 of different shapes are selected according to the flow path conditions. Semi-circular or claw-shaped elbows can be chosen. Taking a semi-circular elbow as an example, its specifications can be an outer diameter of 7mm and a wall thickness of 0.41mm. The end of the elbow 110 is flared to form a flared section 120, which is then fitted with the internally threaded pipe 210. The fitting method can be high-frequency welding, without the need for a welding ring. After the elbow 100 is fitted, it is welded to the internally threaded pipe 210 using high-frequency welding.

[0034] Preferably, compared to the common connection method of not flaring the pipe end of the traditional internally threaded pipe 210, by adding a flared section 120 to the pipe end without flaring the internally threaded pipe 210, the internally threaded pipe 210 becomes more stable. Furthermore, not flaring reduces the risk of wall thinning, thus making the internally threaded pipe 210 more stable when operating within the heat exchanger 200, and enhancing system reliability. Simultaneously, the internally threaded pipe 210 does not require a flaring process, resulting in faster manufacturing and higher efficiency.

[0035] Specifically, the inner diameter of the flared part, 130, is greater than the outer diameter of the internally threaded pipe, 240.

[0036] Preferably, by setting the inner diameter 130 of the flared part to be larger than the outer diameter 240 of the internally threaded pipe, it is more convenient and faster to install the elbow 100 to the internally threaded pipe 210, and it is more stable when the flared part 120 is fitted onto the internally threaded pipe 210, thereby improving the overall stability of the elbow 100 after connecting to the internally threaded pipe 210, and thus improving the overall stability and reliability of the system.

[0037] Specifically, the single-sided clearance is defined as twice the inner diameter 130 minus the outer diameter 240, and the single-sided clearance is denoted as Δd, the inner diameter 130 is D1, the outer diameter 240 is D2, and Δd = (D1 - D2) / 2; the single-sided clearance of the flared part 120 is 0.03mm~0.2mm.

[0038] Preferably, if the gap is too small, the flared part 120 will make hard contact with the mating part during assembly, resulting in local stress concentration, which is prone to fatigue cracking after long-term use; if the gap is too large, additional preload is required to compensate, which accelerates wear. At the same time, it is necessary to ensure minimum contact pressure within this range to prevent media leakage, avoid sealing failure due to excessive gap, and be compatible with assembly tolerances.

[0039] Specifically, the heat exchanger 200 is provided with a side plate 230, and the internally threaded tube 210 is installed through the side plate 230. The height 140 of the flared part is less than the protrusion height 250 of the internally threaded tube 210 through the side plate 230.

[0040] Preferably, by setting the height of the flared part 140 to be less than that of the internally threaded pipe 210, it is easier to weld later. This method makes the overall installation efficiency higher, and the system more stable and reliable after installation.

[0041] Specifically, the tube 110 is semi-circular or claw-shaped.

[0042] Preferably, by setting the pipe section 110 to be semi-circular or claw-shaped, the pipe section 110 can adapt to different usage conditions, making installation more convenient, thereby making the elbow 100 more practical and compatible, better adapting to different installation positions, and thus making the overall installation efficiency higher.

[0043] This utility model also provides a heat exchanger 200, which is provided with elbows 100 as described above. The heat exchanger 200 is composed of fins 220, side plates 230, multiple internally threaded tubes 210 and multiple elbows 100. The multiple elbows 100 and the multiple internally threaded tubes 210 are connected in a one-to-one manner. The heat exchanger 200 further includes: each internally threaded tube 210 passing through the fins 220 and the side plates 230; and each internally threaded tube 210 passing through the side plates 230 and the fins 220, and after being expanded, it is interference-fitted with the fins 220 and the side plates 230.

[0044] Preferably, the expansion of the tube 210, which protrudes from the side plate 230, allows for an interference fit with the fins 220 and side plate 230, ensuring a tight fit between the tube wall and the fins 220 and side plate 230, thus eliminating contact gaps. Simultaneously, the radial compressive stress generated by the expansion suppresses relative displacement between the fins 220 and the tube body. The plastic deformation after expansion provides a buffer for thermal expansion, preventing tensile stress between the tube body and the fins 220, thereby improving the overall system reliability and stability.

[0045] Specifically, the outer diameter of each internally threaded pipe 210 before expansion is the same as the outer diameter of the pipe section 110 of each elbow 100 after flaring.

[0046] Preferably, by setting the outer diameter of the internally threaded tube 210 before expansion to be the same as the outer diameter of the tube section 110 after flaring, the internal fluid's flow rate becomes more stable, and docking and installation become more convenient and stable, ensuring the stability and reliability of the heat exchanger 200 during operation.

[0047] Specifically, the multiple elbows 100 and the multiple internally threaded pipes 210 are fixed by welding, and the welding method is high-frequency welding.

[0048] Preferably, by setting a high-frequency welding method, the use of welding rings is eliminated. High-frequency current flows through the contact surface of the parts to generate resistance heat, and pressure is applied or not applied to connect the parts. This reduces the occurrence of overheating and weld leakage in manual welding and improves the manufacturing qualification rate.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bend for mating with an internally threaded tube (210) of a heat exchanger (200), characterized in that, The elbow comprises: a pipe section (110); a plurality of flared sections (120) connected by the pipe section (110); and the plurality of flared sections (120) are sleeved on the internally threaded pipe (210) to fix the elbow on the heat exchanger (200).

2. The elbow according to claim 1, wherein the inner diameter (130) of the flared section is larger than the outer diameter (240) of the internally threaded pipe.

3. The elbow according to claim 2, wherein the double single-side gap is defined as the inner diameter (130) minus the outer diameter (240), denoted as Δd, the inner diameter (130) as D1, and the outer diameter (240) as D2, Δd = (D1-D2) / 2; the single-side gap of the flared section (120) is 0.03mm-0.2mm.

4. The elbow of claim 1, wherein The heat exchanger (200) is provided with a side plate (230), and the internally threaded pipe (210) is arranged through the side plate (230), the height (140) of the flared section is smaller than the exposed head height (250) of the internally threaded pipe (210) through the side plate (230).

5. The elbow according to claim 1, wherein the pipe section (110) is semicircular or claw-shaped.

6. A heat exchanger (200) provided with a bend according to any one of claims 1-5, characterized in that The heat exchanger (200) is composed of fins (220), the side plate (230), a plurality of the internally threaded pipes (210) and a plurality of the elbows, and a plurality of the elbows and a plurality of the internally threaded pipes (210) are connected one by one, and the heat exchanger (200) further comprises: each of the internally threaded pipes (210) passes through the fins (220) and the side plate (230); and each of the internally threaded pipes (210) passes through the fins (220) and the side plate (230) and then is expanded and is in interference fit with the fins (220) and the side plate (230).

7. The heat exchanger (200) according to claim 6, wherein the outer diameter of each of the internally threaded pipes (210) before expansion is the same as the outer diameter of the pipe section (110) of each of the elbows before flaring.

8. The heat exchanger (200) according to claim 7, wherein the fixing mode between a plurality of the elbows and a plurality of the internally threaded pipes (210) is welding, and the welding mode is high-frequency welding.

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