Coiled pipe type convection heating surface pipe and pipe connecting device

Abstract

The utility model relates to the technical field of boiler parts, and discloses a coiled pipe type convection heating surface pipe and pipe connecting device which comprises a first fixing mechanism, a connecting mechanism is fixedly installed at the front end of the first fixing mechanism, and a second fixing mechanism is fixedly installed at the front end of the connecting mechanism. The first fixing mechanism is composed of a left clamping piece and a right clamping piece, the right clamping piece is movably installed at the front end of the left clamping piece, and a hinge is arranged at the right end connecting position of the left clamping piece and the right clamping piece. Through cooperation of the first fixing mechanism, the connecting mechanism and the second fixing mechanism, the transverse pitch between the coiled pipes can be well guaranteed while the limiting effect on the coiled pipes is achieved, free expansion of the coiled pipes in the longitudinal direction is guaranteed, the coiled pipes can better and more evenly receive convection heat from flue gas, and the service life of the coiled pipes is prolonged. And a better heat exchange effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler parts, and particularly relates to a connecting device for serpentine convection heating surface tubes and tubes. Background Technique

[0002] A boiler is an energy conversion device. The energy input into the boiler includes the chemical energy in fuel, electric energy, and the boiler outputs steam with a certain heat energy, high-temperature water or organic heat carrier. Among the boiler parts, there is a serpentine tube. The serpentine tube convection heating surface is widely used in boilers. In order to ensure the effective and uniform heat absorption of the serpentine tube, the distance between the serpentine tubes is required to be uniform, so as to ensure the uniform flue gas flow rate;

[0003] During operation, problems often occur due to different expansion amounts or disturbances from external flue gas and internal steam medium, causing the tubes or the fixed parts with pipe clamps to shake and impact, resulting in problems such as misalignment, disorder, deformation of the serpentine tube group and tube damage, bringing potential hidden dangers and problems to the safe operation of the unit;

[0004] Chinese Patent (Publication No.: CN207455559U) discloses a fixing device for a serpentine tube group of a boiler convection heating surface. Through the setting of structures such as a membrane water wall tube, a U-shaped horizontal cooling fixing tube, a water supply valve, a sealing component, etc., the service life of the heating surface serpentine tube screen is extended, and the safe, stable and economic operation of the boiler is ensured;

[0005] Although this technology solves the potential hidden dangers existing in the operation of the device, there are still certain defects. At present, the serpentine tube heating surfaces are all clamped with splints or directly welded with connecting steel plates between the tubes to control the distance between the convection heating surface tubes. The splint structure requires die pressing, and the steel plate connection limits the mutual expansion of the tubes. Especially for the convection heating surface with a large coefficient of thermal expansion such as stainless steel in the high-temperature heating surface, expansion inconsistency often occurs, resulting in weld cracking and operation accidents. Therefore, a connecting device is needed to effectively control the distance between the serpentine tube heating surfaces and ensure that the tubes have a certain free expansion distance. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the utility model provides a connecting device for serpentine convection heating surface tubes and tubes. Through the cooperation between the first fixing mechanism, the connecting mechanism and the second fixing mechanism, while playing a limiting role on the serpentine tube, it can well ensure the lateral pitch between the serpentine tubes, and ensure the free expansion of the serpentine tube in the longitudinal direction, so that the serpentine tube can better and more uniformly receive the convection heat from the flue gas, achieving a better heat exchange effect, and solving the problem that the existing connecting device restricts the mutual expansion of the tubes.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A connecting device for a serpentine tube type convective heating surface tube and a tube, including a first fixing mechanism, a connecting mechanism is fixedly installed at the front end of the first fixing mechanism, and a second fixing mechanism is fixedly installed at the front end of the connecting mechanism;

[0008] The first fixing mechanism is composed of a left clamping piece and a right clamping piece. The right clamping piece is movably installed at the front end of the left clamping piece. A hinge is provided at the connection between the right ends of the left clamping piece and the right clamping piece. The connecting mechanism is composed of a first splicing plate and a second splicing plate. The first splicing plate is fixedly installed at the front end of the first fixing mechanism, and the second splicing plate is fixedly installed at the rear end of the second fixing mechanism. Through the cooperation among the first fixing mechanism, the connecting mechanism, and the second fixing mechanism, while playing a limiting role on the serpentine tube, it can well ensure the lateral pitch between the serpentine tubes and ensure the free expansion of the serpentine tube in the longitudinal direction, enabling the serpentine tube to better and more evenly receive the convective heat from the flue gas and achieving a better heat exchange effect.

[0009] Preferably, the left clamping piece and the right clamping piece have the same structure, and they are circular after being closed. The first fixing mechanism and the second fixing mechanism have the same structure.

[0010] Preferably, an arc-shaped groove chamber is opened inside the left clamping piece, and an inner clamping piece is movably installed inside the arc-shaped groove chamber.

[0011] Preferably, the inner clamping piece is located inside the inner ring of the left clamping piece. A plurality of groups of first springs are arranged between the inner clamping piece and the left clamping piece inside the arc-shaped groove chamber. The diameter of the circle formed by the two groups of inner clamping pieces after the left clamping piece and the right clamping piece are fixed is smaller than the diameter of the serpentine tube.

[0012] Preferably, a lock chamber is opened inside the first splicing plate. A group of lock plates are respectively arranged on the left and right sides inside the lock chamber, and a second spring is fixedly installed between the two groups of lock plates.

[0013] Preferably, two groups of pressing blocks are fixedly installed at the front ends of both sides of the lock plates, and both groups of pressing blocks extend out of the two side surfaces of the first splicing plate. Two groups of lock heads are fixedly installed at the rear ends of both sides of the lock plates, and the lock heads extend out of the two side surfaces of the first splicing plate.

[0014] Preferably, a splicing chamber is opened inside the second splicing plate. A plurality of groups of limiting grooves are opened on the left and right inner walls of the splicing chamber. The first splicing plate is inserted into the second splicing plate through the splicing chamber.

[0015] Preferably, the length of a group of limiting grooves is greater than the length of a group of pressing blocks, and the distance between the two groups of limiting grooves is smaller than the distance between the two groups of pressing blocks.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] 1. The connecting device for the serpentine tube convection heating surface tube and the tube, by installing devices such as left clamping pieces, inner clamping pieces, first springs, right clamping pieces, first splicing plates, second splicing plates, etc., through the cooperation between the first fixing mechanism, the connecting mechanism, and the second fixing mechanism, while playing a limiting role on the serpentine tube, can well ensure the lateral pitch between the serpentine tubes and ensure the free expansion of the serpentine tube in the longitudinal direction, so that the serpentine tube can better and more evenly receive the convective heat from the flue gas, achieving a better heat exchange effect.

[0018] 2. The connecting device for the serpentine tube convection heating surface tube and the tube, by installing devices such as first splicing plates, lock chambers, lock plates, lock heads, pressing blocks, second springs, second splicing plates, splicing chambers, limiting grooves, etc., achieves the purpose of improving the applicability of the device, and can adjust the distance between the first fixing mechanism and the second fixing mechanism according to the distance between the serpentine tube and the tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the installation structure of the connecting device of the present invention;

[0021] Figure 2 Schematic diagram of the structure of the first fixing mechanism of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the left clamping piece of the present invention;

[0023] Figure 4 Schematic diagram of the internal structure of the connecting mechanism of the present invention.

[0024] Description of the reference numerals:

[0025] 1. First fixing mechanism; 11. Left clamping piece; 12. Arc-shaped groove chamber; 13. Inner clamping piece; 14. First spring; 15. Hinge; 16. Right clamping piece; 2. Connecting mechanism; 21. First splicing plate; 22. Lock chamber; 23. Lock plate; 24. Lock head; 25. Pressing block; 26. Second spring; 27. Second splicing plate; 28. Splicing chamber; 29. Limiting groove; 3. Second fixing mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 to 4 , the present invention provides a technical solution:

[0028] A connecting device for a serpentine tube convection heating surface tube and a tube, comprising a first fixing mechanism 1. A connecting mechanism 2 is fixedly installed at the front end of the first fixing mechanism 1. A second fixing mechanism 3 is fixedly installed at the front end of the connecting mechanism 2. The first fixing mechanism 1 is composed of a left clamping piece 11 and a right clamping piece 16. The right clamping piece 16 is movably installed at the front end of the left clamping piece 11. A hinge 15 is provided at the connection between the right ends of the left clamping piece 11 and the right clamping piece 16. The connecting mechanism 2 is composed of a first splicing plate 21 and a second splicing plate 27. The first splicing plate 21 is fixedly installed at the front end of the first fixing mechanism 1. The second splicing plate 27 is fixedly installed at the rear end of the second fixing mechanism 3. Through the cooperation among the first fixing mechanism 1, the connecting mechanism 2, and the second fixing mechanism 3, while playing a limiting role on the serpentine tube, it can well ensure the lateral pitch between the serpentine tubes and ensure the free expansion of the serpentine tube in the longitudinal direction, enabling the serpentine tube to better and more evenly receive the convective heat from the flue gas and achieving a better heat exchange effect. The left clamping piece 11 and the right clamping piece 16 have the same structure, and they are circular after being closed. The first fixing mechanism 1 and the second fixing mechanism 3 have the same structure. An arc-shaped chamber 12 is opened inside the left clamping piece 11. An inner clamping piece 13 is movably installed inside the arc-shaped chamber 12. The inner clamping piece 13 is located inside the inner ring of the left clamping piece 11. A number of first springs 14 are provided between the inner clamping piece 13 and the left clamping piece 11 inside the arc-shaped chamber 12. The diameter of the circle formed by the two groups of inner clamping pieces 13 after the left clamping piece 11 and the right clamping piece 16 are fixed is smaller than the diameter of the serpentine tube. The length of one group of limiting grooves 29 is greater than the length of one group of pressing blocks 25. The distance between the two groups of limiting grooves 29 is smaller than the distance between the two groups of pressing blocks 25.

[0029] By adopting the above technical solution, the current serpentine tube heating surface controls the spacing of the convective heating surface tubes by clamping the tubes with splints or directly welding connecting steel plates between the tubes. The splint structure requires die pressing, and the steel plate connection limits the expansion between the tubes. Especially for the convective heating surface with a large coefficient of thermal expansion such as stainless steel in the high-temperature heating surface, the inconsistent expansion often causes the weld to crack and leads to operation accidents. This device solves such problems through the design of the first fixing mechanism 1, the connecting mechanism 2, and the second fixing mechanism 3. When in use, the left clip 11 and the right clip 16 of the first fixing mechanism 1 and the left clip 11 and the right clip 16 of the second fixing mechanism 3 are opened, and they are respectively sleeved on the corresponding serpentine tube. Then, the left clip 11 and the right clip 16 are fixed by welding. After the left clip 11 and the right clip 16 are fixed, the diameter of the circle formed by the two sets of inner clips 13 inside is smaller than the diameter of the serpentine tube, so that the two sets of inner clips 13 are clamped on both sides of the tube. When the serpentine tube expands due to heat, the arc-shaped chamber 12 allows the inner clip 13 to have a certain space for movement. Thus, the inner clip 13 inside the first fixing mechanism 1 and the second fixing mechanism 3 will contract inward and compress the first spring 14. When the serpentine tube cools down and shrinks after no longer being heated, the first spring 14 keeps the inner clip 13 in a state of clamping the tube all the time. The first fixing mechanism 1 and the second fixing mechanism 3 are connected by the connecting mechanism 2. Through the design that the length of a set of limit slots 29 is greater than the length of a set of pressing blocks 25, and the distance between the two sets of limit slots 29 is less than the distance between the two sets of pressing blocks 25, the distance between the two sets of tubes is reduced when the serpentine tube expands, and the distance between the first fixing mechanism 1 and the second fixing mechanism 3 can also be reduced through the connecting mechanism 2. Through the above design, while this device has a limiting effect on the serpentine tubes, it avoids the occurrence of operation accidents.

[0030] Specifically, as Figure 3 shown, a lock chamber 22 is opened inside the first splicing plate 21. A set of lock plates 23 are respectively arranged on the left and right sides inside the lock chamber 22. A second spring 26 is fixedly installed between the two sets of lock plates 23. Two groups of pressing blocks 25 are fixedly installed at the front ends of the two sets of lock plates 23, and the two groups of pressing blocks 25 both extend out of the two side surfaces of the first splicing plate 21. Two groups of lock heads 24 are fixedly installed at the rear ends of the two sets of lock plates 23, and the lock heads 24 both extend out of the two side surfaces of the first splicing plate 21. A splicing chamber 28 is opened inside the second splicing plate 27. A number of groups of limit slots 29 are opened on the left and right inner walls of the splicing chamber 28. The first splicing plate 21 is inserted into the second splicing plate 27 through the splicing chamber 28.

[0031] By adopting the above technical solution, the models of the serpentine tubes are different, resulting in different distances between the serpentine tubes. The device is designed with a connecting mechanism 2 to have the ability to adjust the distance between the first fixing mechanism 1 and the second fixing mechanism 3, improving the applicability of the device. The connecting mechanism 2 is composed of a first splicing plate 21 and a second splicing plate 27. A lock is arranged in the first splicing plate 21, which is composed of two groups of lock plates 23. A corresponding limiting groove 29 is arranged in the second splicing plate 27. When adjusting the distance between the first fixing mechanism 1 and the second fixing mechanism 3, first press the lock heads 24 on the left and right sides of the first splicing plate 21 to reduce the distance between the two groups of lock plates 23 in the lock chamber 22, so that the pressing block 25 extending out of the first splicing plate 21 retracts into the lock chamber 22. At this time, the distance between the first fixing mechanism 1 and the second fixing mechanism 3 is adjusted according to the distance between the tubes. After adjustment, release the lock head 24. Due to the existence of the second spring 26, the pressing block 25 extends out of the first splicing plate 21 again, and the pressing block 25 is inserted into the limiting groove 29 to complete the adjustment of the first splicing plate 21 and the second splicing plate 27.

[0032] Working principle: When in use, open the left clip 11 and the right clip 16 of the first fixing mechanism 1 and the left clip 11 and the right clip 16 of the second fixing mechanism 3, and respectively put them on the corresponding serpentine tube. Then fix the left clip 11 and the right clip 16 by welding. After the left clip 11 and the right clip 16 are fixed, the circular diameter formed by the two sets of inner clips 13 inside is smaller than the diameter of the serpentine tube, so that the two sets of inner clips 13 clamp on both sides of the tube. When the serpentine tube expands due to heat, the arc-shaped chamber 12 enables the inner clip 13 to have a certain movement space. Thus, the inner clip 13 inside the first fixing mechanism 1 and the second fixing mechanism 3 will shrink inward and compress the first spring 14. When the serpentine tube no longer heats up and cools down and shrinks, the first spring 14 enables the inner clip 13 to always maintain the state of clamping the tube. The first fixing mechanism 1 and the second fixing mechanism 3 are connected by a connecting mechanism 2. Through the design that the length of a set of limit slots 29 is greater than the length of a set of pressing blocks 25, and the distance between the two sets of limit slots 29 is less than the distance between the two sets of pressing blocks 25, when the serpentine tube expands, the distance between the two sets of tubes shrinks, and the distance between the first fixing mechanism 1 and the second fixing mechanism 3 can also be reduced through the connecting mechanism 2. Through the above design, the device has a limiting effect on the serpentine tubes and avoids the occurrence of operating accidents; through the design of the connecting mechanism 2, it has the ability to adjust the distance between the first fixing mechanism 1 and the second fixing mechanism 3, improving the applicability of the device. The connecting mechanism 2 consists of a first splicing plate 21 and a second splicing plate 27. A lock formed by two sets of lock plates 23 is arranged inside the first splicing plate 21, and corresponding limit slots 29 are arranged inside the second splicing plate 27. When adjusting the distance between the first fixing mechanism 1 and the second fixing mechanism 3, first press the lock heads 24 on the left and right sides of the first splicing plate 21 to reduce the distance between the two sets of lock plates 23 inside the lock chamber 22, so that the pressing blocks 25 extending out of the first splicing plate 21 retract into the lock chamber 22. At this time, adjust the distance between the first fixing mechanism 1 and the second fixing mechanism 3 according to the distance between the tubes. After adjustment, release the lock heads 24. Due to the existence of the second spring 26, the pressing blocks 25 extend out of the first splicing plate 21 again, and the pressing blocks 25 are stuck into the limit slots 29 to complete the adjustment of the first splicing plate 21 and the second splicing plate 27.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connecting device for a serpentine tube convection heating surface tube and a tube, comprising a first fixing mechanism (1), characterized in that: A connecting mechanism (2) is fixedly installed at the front end of the first fixing mechanism (1), and a second fixing mechanism (3) is fixedly installed at the front end of the connecting mechanism (2). The first fixing mechanism (1) is composed of a left clamping piece (11) and a right clamping piece (16). The right clamping piece (16) is movably installed at the front end of the left clamping piece (11). A hinge (15) is arranged at the connection between the right ends of the left clamping piece (11) and the right clamping piece (16). The connecting mechanism (2) is composed of a first splicing plate (21) and a second splicing plate (27). The first splicing plate (21) is fixedly installed at the front end of the first fixing mechanism (1), and the second splicing plate (27) is fixedly installed at the rear end of the second fixing mechanism (3). Through the cooperation among the first fixing mechanism (1), the connecting mechanism (2), and the second fixing mechanism (3), while playing a limiting role on the serpentine tube, it can well ensure the lateral pitch between the serpentine tubes and ensure the free expansion of the serpentine tube in the longitudinal direction, so that the serpentine tube can better and more evenly receive the convective heat from the flue gas and achieve a better heat exchange effect.

2. The tube connection device between the serpentine convective heating surface tubes and tubes according to claim 1, wherein: The left clamping piece (11) and the right clamping piece (16) have the same structure, and they are circular after being closed. The first fixing mechanism (1) and the second fixing mechanism (3) have the same structure.

3. The tube connection device for a serpentine convective heating surface tube according to claim 2, characterized in that: An arc-shaped chamber (12) is opened inside the left clamping piece (11), and an inner clamping piece (13) is movably installed inside the arc-shaped chamber (12).

4. The pipe connection device between the serpentine tube convection heating surface tubes according to claim 3, characterized in that: The inner clamping piece (13) is located inside the inner ring of the left clamping piece (11). A number of groups of first springs (14) are arranged between the inner clamping piece (13) and the left clamping piece (11) inside the arc-shaped chamber (12). After the left clamping piece (11) and the right clamping piece (16) are fixed, the diameter of the circle formed by the two groups of inner clamping pieces (13) is smaller than the diameter of the serpentine tube.

5. The tube connection device between the serpentine tube convective heating surface tube and the tube according to claim 1, characterized in that: A lock chamber (22) is opened inside the first splicing plate (21). A group of lock plates (23) are respectively arranged on the left and right sides inside the lock chamber (22), and a second spring (26) is fixedly installed between the two groups of lock plates (23).

6. The tube connection device for a serpentine tube convection heating surface tube according to claim 5, characterized in that: Two groups of pressing blocks (25) are fixedly installed at the front ends of the two sides of the lock plates (23), and the two groups of pressing blocks (25) both extend out of the two side surfaces of the first splicing plate (21). Two groups of lock heads (24) are fixedly installed at the rear ends of the two sides of the lock plates (23), and the lock heads (24) both extend out of the two side surfaces of the first splicing plate (21).

7. A connecting device for a serpentine tube convection heating surface tube and a tube according to claim 1, characterized in that: A splicing chamber (28) is opened inside the second splicing plate (27). A number of groups of limiting grooves (29) are opened on the left and right inner side walls of the splicing chamber (28). The first splicing plate (21) is inserted into the second splicing plate (27) through the splicing chamber (28).

8. A connecting device between a serpentine tube convection heating surface tube and a tube according to claim 7, characterized in that: The length of a group of limiting grooves (29) is greater than the length of a group of pressing blocks (25), and the distance between the two groups of limiting grooves (29) is smaller than the distance between the two groups of pressing blocks (25).

Images