Low-temperature economizer with smoke leakage prevention function

Abstract

The low-temperature economizer with the smoke leakage prevention function comprises a box body, heat exchange pipes, a first pipe plate, a second pipe plate and a lantern ring, the left end and the right end of each heat exchange pipe are communicated with the ends of the adjacent heat exchange pipes through elbows respectively, and the multiple heat exchange pipes and the elbows penetrate through the first pipe plate and the second pipe plate in a snake-shaped reciprocating mode; the outer wall of the left end of the heat exchange tube is connected with the first tube plate in a full welding mode, the second tube plate is provided with a penetrating connection hole, and the outer wall face of the lantern ring is matched with the penetrating connection hole. A sealing ring I and a sealing ring II which are coaxial are respectively arranged on the outer wall surface and the inner wall surface of the inner end of the lantern ring; a baffle is arranged on the outer wall surface of the outer end of the lantern ring; the baffle abuts against the outer side face of the second tube plate, so that the first sealing ring tightly presses the inner side face of the second tube plate. The outer wall face of the right end of the heat exchange pipe penetrates through an inner hole slidably connected with the second sealing ring. The first sealing ring and the second sealing ring form a double-sealing structure, the sealing effect is good, and smoke is effectively prevented from leaking from gaps to corrode the elbow.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a low-temperature economizer with a smoke leakage prevention function. Background Art

[0002] Low-temperature economizer is a device used to recover waste heat from flue gas. Many devices are connected with low-temperature economizers to facilitate the recovery of heat from flue gas discharged by the equipment. In order to prevent uneven expansion of the heat exchange tube and the flue, the heat exchange tube and the tube sheet are usually arranged in a perforated manner. During the heat exchange of flue gas through the economizer, the flue gas passes through the gap between the tube sheet and the heat exchange tube to the area where the elbow is located; the flue gas is highly corrosive, and after running for a period of time, the elbow will wear and leak flue gas, and the flue gas condensate in the area where the elbow is located will corrode the elbow and the heat exchange tube; in the prior art, the method to prevent leakage at the elbow is to add a sealing sleeve at the tube hole; however, a small amount of flue gas still leaks from the sealing surface to the area where the elbow is located, corroding the elbow. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the above-mentioned prior art and provide a low-temperature economizer with a smoke leakage prevention function to solve the problem that the expansion end of the existing perforated low-temperature economizer is prone to smoke leakage and causes elbow corrosion.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A low-temperature economizer with a smoke leakage prevention function comprises a box body, a heat exchange tube, a tube sheet 1 and a tube sheet 2. The tube sheets 1 and 2 are welded to the box body on all sides to isolate the inside of the box body into three areas; the left and right ends of the heat exchange tube are connected to the ends of adjacent heat exchange tubes through elbows respectively, and a number of heat exchange tubes and elbows reciprocate through tube sheets 1 and 2 in a serpentine shape, and the heat exchange tube is connected to the water inlet pipe and the water outlet pipe outside the box body, and also comprises a collar; the outer wall of the left end of the heat exchange tube is fully welded to the tube sheet 1, and the tube sheet 2 is provided with a through hole; the outer wall surface of the collar cooperates with the through hole; the outer and inner wall surfaces of the inner end of the collar are respectively provided with coaxial sealing rings 1 and 2; the outer wall surface of the outer end of the collar is provided with a baffle; the baffle abuts against the outer side surface of the tube sheet 2, so that the sealing ring 1 presses the inner side surface of the tube sheet 2; the outer wall surface of the right end of the heat exchange tube passes through the inner hole of the sliding connection sealing ring 2.

[0006] Furthermore, it also includes a sealing sleeve composed of two semicircular cylinders; the inner hole of the sealing sleeve is provided with a sealing layer that matches the outer wall surface of the heat exchange tube; an elastic sealing strip is provided on the joint surface of the two semicircular cylinders, and the outer ends of the two semicircular cylinders are bolted together to connect the heat exchange tube; a sealing gasket is attached to the outer wall surface of the sealing sleeve; the inner hole of the second sealing ring is in contact with the sealing gasket to form an annular seal.

[0007] Furthermore, a plurality of elastic convex rings are closely arranged on the outer surface of the sealing gasket along the axial direction of the sealing sleeve.

[0008] Furthermore, the diameters of the elastic convex rings on the sealing gasket increase gradually from the inside to the outside.

[0009] Furthermore, the baffle is rotatably connected to the outer end of the collar by means of rivets; after the baffle is rotated to the outside of the collar, it abuts against the outer side surface of the tube sheet 2.

[0010] Furthermore, the baffle is a spring sheet, and the elastic force of the baffle acts on the outer side surface of the second tube sheet, so that the sealing ring 1 presses the inner side surface of the second tube sheet.

[0011] The utility model has the following beneficial effects:

[0012] 1. The utility model provides a low-temperature economizer with a smoke leakage prevention function, including a box body, a heat exchange tube, a tube sheet 1, a tube sheet 2, and a collar located in the through hole of the tube sheet 2. A sealing ring 1 and a sealing ring 2 are arranged at the inner end of the collar; a baffle is arranged at the outer end; the baffle abuts against the outer side surface of the tube sheet 2, and the sealing ring 1 is pressed and contacts the inner side surface of the tube sheet 2; the sealing ring 2 is sleeved on the outer wall surface of the heat exchange tube to be tightly slidably connected. The sealing ring 1 and the sealing ring 2 form a double sealing structure with good sealing effect, which effectively prevents smoke from leaking from the gap between the collar and the heat exchange tube, and from the gap between the collar and the tube sheet, and avoids corrosion damage in the elbow area.

[0013] 2. A sealing sleeve composed of two semicircular cylinders is provided; the inner hole of the sealing sleeve is matched with the sleeve of the heat exchange tube; a sealing gasket is provided on the outer wall of the sealing sleeve; the sealing ring 2 is sleeved with the sealing gasket to form an annular seal; when the expansion of the heat exchange tube and the box body is uneven, the sealing ring 2 slides axially against the sealing gasket to adapt to the expansion difference, and an elastic sealing structure is formed by the sealing ring 2 and the sealing gasket, so that the sealing effect is good.

[0014] 3. Several elastic convex rings with increasing diameters are closely arranged on the outer surface of the sealing gasket, so that the second sealing ring is tightly attached between the two elastic convex rings. Through the change of the diameter of the elastic convex ring, the contact condition of the sealing surface automatically adapts to the change of the expansion difference between the heat exchange tube and the box body, and always maintains a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] Figure 1 It is the front view of the utility model;

[0017] Figure 2 for Figure 1 Middle A-direction view;

[0018] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure;

[0019] Figure 4 This is a schematic diagram of the connection structure between the sealing sleeve and the heat exchange tube of the utility model;

[0020] Figure 5 This is a schematic diagram of the sleeve structure of the utility model;

[0021] Figure 6 for Figure 2 Sectional view at the middle BB;

[0022] Figure 7 for Figure 6 A partial enlarged view of point C in the middle.

[0023] In the figure, 1, box body; 2, heat exchange tube; 3, tube sheet 1; 4, tube sheet 2; 41, connecting hole; 5, elbow; 6, collar; 61, sealing ring 1; 62, sealing ring 2; 63, baffle; 7, sealing sleeve; 71, sealing layer; 72, sealing gasket; 73, elastic convex ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments.

[0025] like Figure 1-3 As shown, the utility model provides a low-temperature economizer with a smoke leakage prevention function, including a box body 1, a heat exchange tube 2, a tube sheet 1 3, and a tube sheet 2 4. The four sides of the tube sheet 1 3 and the tube sheet 2 4 are welded and connected to the box body 1, and the inside of the box body 1 is blocked to form three areas; the high-temperature smoke enters the area between the tube sheet 1 3 and the tube sheet 2 4 from the smoke inlet, and after heat exchange with the heat exchange tube 2, it is discharged from the box body 1 through the smoke outlet. The left and right ends of the heat exchange tube 2 are respectively connected to the ends of the adjacent heat exchange tubes 2 through the elbow 5, and a plurality of heat exchange tubes 2 and the elbow 5 reciprocate through the tube sheet 1 3 and the tube sheet 2 4 in a serpentine shape, and the heat exchange tube 2 is connected to the water inlet pipe and the water outlet pipe outside the box body 1.

[0026] The left end outer wall of the heat exchange tube 2 is fully welded to the tube sheet 1 3, and the tube sheet 2 4 is provided with a through hole 41; Figure 5 As shown, it also includes a collar 6, the outer wall surface of the collar 6 cooperates with the penetration hole 41; the outer and inner wall surfaces of the inner end of the collar 6 are respectively provided with coaxial sealing ring 1 61 and sealing ring 2 62; the outer wall surface of the outer end of the collar 6 is provided with a baffle 63; the baffle 63 abuts against the outer side surface of the tube sheet 2 4, so that the sealing ring 1 61 presses the inner side surface of the tube sheet 2 4; the outer wall surface of the right end of the heat exchange tube 2 passes through the inner hole of the sliding connection sealing ring 2 62.

[0027] like Figure 4 As shown, the present application is also provided with a sealing sleeve 7 composed of two semicircular cylinders; the inner hole of the sealing sleeve 7 is provided with a sealing layer 71 matched with the outer wall surface of the heat exchange tube 2; an elastic sealing strip is provided on the joint surface of the two semicircular cylinders, and the outer ends of the two semicircular cylinders are connected to the heat exchange tube 2 by bolts; the two semicircular cylinders are first buckled on the heat exchange tube 2, and then the sealing sleeve 7 is moved along the heat exchange tube 2 so that the inner end of the sealing sleeve 7 enters the inner hole of the sealing ring 62, and the inner end of the sealing sleeve 7 is elastically constrained by the sealing ring 62, and finally the two semicircular cylinders are fixed and buckled by bolts to connect the sealing sleeve 7 to the heat exchange tube 2.

[0028] The outer wall of the sealing sleeve 7 is provided with a sealing gasket 72; the inner hole of the sealing ring 2 62 contacts the sealing gasket 72 to form an annular seal. This design avoids the situation where the heat exchange tube 2 and the through hole 41 are in hard contact and cause smoke leakage; when the expansion of the heat exchange tube 2 and the box body 1 is uneven, the position of the tube sheet 1 3 and the heat exchange tube 2 connected by welding remains unchanged, and the tube sheet 2 4 expands to one side, driving the sealing ring 2 62 to slide axially against the sealing gasket 72, so that the heat exchange tube 2 and the through hole 41 form an elastic contact sealing structure through the sealing ring 2 62 and the sealing gasket 72, and the sealing effect is good.

[0029] like Figure 4 , 7 As shown, a plurality of elastic convex rings 73 are closely arranged on the outer surface of the sealing gasket 72 along the axial direction of the sealing sleeve 7. The sealing ring 62 is tightly attached between the two elastic convex rings 73; the elastic convex rings 73 improve the sealing effect of the sealing surface.

[0030] The diameter of the elastic convex ring 73 on the sealing gasket 72 increases gradually from the inside to the outside. That is, the diameter of the elastic convex ring 73 close to the inner end of the sealing sleeve 7 is smaller; therefore, when the expansion difference between the heat exchange tube 2 and the box body 1 gradually increases, the sealing ring 62 slides axially to different positions of the elastic convex ring 73 close to the sealing gasket 72, and the sealing effect of the sealing ring 62 and the sealing gasket 72 is gradually improved through the change of the diameter of the elastic convex ring 73.

[0031] like Figure 5 As shown, the baffle 63 is rotatably connected to the outer end of the collar 6 by rivets; after the baffle 63 is rotated to the outside of the collar 6, it abuts against the outer side of the tube sheet 2 4. This design simplifies the installation process of the baffle 63, and the baffle 63 can be made integrally with the collar 6 and pre-installed in the penetration hole 41.

[0032] The baffle 63 is a spring sheet, and the elastic force of the baffle 63 acts on the outer side of the tube sheet 2 4, so that the sealing ring 1 61 presses the inner side of the tube sheet 2 4. Relying on the elastic force of the baffle 63, the sealing ring 1 61 automatically presses the tube sheet 2 4 to maintain reliable contact of the sealing surface.

[0033] In the description of the present invention, terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", and "horizontal" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words for the convenience of describing the present invention, and do not necessarily require the present invention to be constructed or operated in a specific direction. They do not specifically refer to any component or element, and cannot be understood as limitations on the present invention.

[0034] The terms "connected" and "connection" in the present invention should be understood in a broad sense. For example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The embodiments of the utility model are only a part of the embodiments, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. This specification is described in accordance with the implementation mode, only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A low-temperature economizer with a smoke leakage prevention function, comprising a box body (1), a heat exchange tube (2), a tube sheet one (3), and a tube sheet two (4), wherein the four sides of the tube sheet one (3) and the tube sheet two (4) are welded to the box body (1), and the interior of the box body (1) is blocked to form three areas; the left end and the right end of the heat exchange tube (2) are respectively connected to the end of the adjacent heat exchange tube (2) through an elbow (5), and a plurality of heat exchange tubes (2) and elbows (5) are serpentinely reciprocated through the tube sheet one (3) and the tube sheet two (4), and the heat exchange tube (2) is connected to a water inlet pipe and a water outlet pipe outside the box body (1), characterized in that: It also includes a collar (6); the left end outer wall of the heat exchange tube (2) is fully welded to the tube sheet one (3); the tube sheet two (4) is provided with a through hole (41); the outer wall surface of the collar (6) is matched with the through hole (41); The outer and inner wall surfaces of the inner end of the collar (6) are respectively provided with coaxial sealing rings 1 (61) and 2 (62); the outer wall surface of the outer end of the collar (6) is provided with a baffle (63); the baffle (63) abuts against the outer side surface of the tube sheet 2 (4) so ​​that the sealing ring 1 (61) is pressed against the inner side surface of the tube sheet 2 (4); the outer wall surface of the right end of the heat exchange tube (2) passes through the inner hole of the sliding connection sealing ring 2 (62).

2. A low-temperature economizer with a smoke leakage prevention function as claimed in claim 1, characterized in that: It also includes a sealing sleeve (7) composed of two semicircular cylinders; the inner hole of the sealing sleeve (7) is provided with a sealing layer (71) that matches the outer wall surface of the heat exchange tube (2); the joint surface of the two semicircular cylinders is provided with an elastic sealing strip, and the outer ends of the two semicircular cylinders are bolted together to sleeve the heat exchange tube (2); the outer wall surface of the sealing sleeve (7) is provided with a sealing gasket (72); the inner hole of the second sealing ring (62) is in contact with the sealing gasket (72) to form an annular seal.

3. A low-temperature economizer with a smoke leakage prevention function as claimed in claim 2, characterized in that: A plurality of elastic convex rings (73) are closely arranged on the outer surface of the sealing gasket (72) along the axial direction of the sealing sleeve (7).

4. A low-temperature economizer with a smoke leakage prevention function as claimed in claim 3, characterized in that: The diameters of the elastic convex rings (73) on the sealing gasket (72) increase gradually from the inside to the outside.

5. A low-temperature economizer with a smoke leakage prevention function as claimed in claim 1, characterized in that: The baffle plate (63) is rotatably connected to the outer end of the collar (6) via rivets; after the baffle plate (63) is rotated to the outside of the collar (6), it abuts against the outer side surface of the second tube sheet (4).

6. A low-temperature economizer with a smoke leakage prevention function as claimed in claim 1, characterized in that: The baffle (63) is a spring sheet, and the elastic force of the baffle (63) acts on the outer side surface of the second tube sheet (4), so that the sealing ring (61) is pressed against the inner side surface of the second tube sheet (4).

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