Expansion joint and boiler deslagging device

Abstract

The utility model provides an expansion joint and a boiler deslagging device, and relates to the technical field of boilers, and the expansion joint comprises a first expansion body, a second expansion body and a flexible sealing filler. The first expansion body comprises a first outer cylinder, a first inner cylinder and a first annular plate, the first outer cylinder is arranged on the first inner cylinder in a sleeving mode, the first annular plate is arranged between the first outer cylinder and the first inner cylinder in a clamped mode and connected with the first outer cylinder and the first inner cylinder in a sealed mode, and a first annular groove is defined by the first outer cylinder, the first inner cylinder and the first annular plate. The second expansion body comprises a second outer cylinder, a second inner cylinder and a second annular plate, an opening of the first annular groove is opposite to an opening of the second annular groove, and the first outer cylinder extends into the second annular groove. The second annular groove is filled with flexible sealing filler, and the insertion end of the first outer cylinder body wraps the flexible sealing filler. The expansion joint can realize flexible connection and sealed connection between the first pipeline and the second pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to an expansion joint and a boiler slag discharge device. Background Art

[0002] Boilers are common heating devices in industry and life. During the operation of the boiler, high-temperature slag is generated. The high-temperature slag needs to be discharged through the boiler slag discharge device to the slag cooler for cooling to form low-temperature slag before it can be transported.

[0003] The boiler slag discharge device includes a furnace chamber, an air distribution plate, and a slag discharge pipe. The bottom of the furnace chamber contains a fluidized bed, and the air distribution plate is horizontally arranged within the fluidized bed. The top of the slag discharge pipe is fixedly connected to the air distribution plate, and the bottom of the slag discharge pipe is fixedly connected to a slag cooler fixed to the ground.

[0004] Because the furnace chamber is suspended from a steel beam at the top of the workshop, it sways, causing the slag discharge pipe to shift horizontally with this movement. Furthermore, as the boiler heats up during operation, the furnace chamber expands downward, with the amount of downward expansion increasing as the furnace approaches the bottom. Consequently, the slag discharge pipe shifts downward with this downward expansion. Because the slag cooler is fixed to the ground, concentrated stress is generated between the slag discharge pipe and the cooler, which can cause the pipe to tear.

[0005] To address this issue, conventional slag discharge pipes are typically configured as upper and lower slag discharge pipes, with an expansion joint installed between the bottom of the upper slag discharge pipe and the top of the lower slag discharge pipe. This expansion joint comprises a conical bottom shell and a top pipe. A socket is provided at the top of the conical shell, through which the top pipe is inserted into the conical shell. The top pipe communicates with the upper slag discharge pipe, which in turn communicates with the lower slag discharge pipe. The top pipe is slidably connected to the conical shell to ensure downward sliding relative to the conical shell. A gap exists between the top pipe and the socket to ensure horizontal displacement of the top pipe relative to the conical shell.

[0006] However, when high-temperature slag and high-temperature flue gas enter the lower slag discharge pipe through the upper slag discharge pipe at the same time, due to the gap between the top pipe and the socket, the high-temperature slag will be ejected from the gap under the action of the high-temperature flue gas, thus creating a danger. Utility Model Content

[0007] In view of this, the present invention provides an expansion joint and a boiler slag discharge device. When the expansion joint is used to connect a first pipe and a second pipe, relative displacement along the axial direction of the first pipe and displacement along the radial direction of the first pipe can be generated between the first and second pipes, thereby achieving a flexible connection between the first and second pipes. In addition, the expansion joint has good sealing performance, which can achieve a sealed connection between the first and second pipes.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0009] In a first aspect, the present invention discloses an expansion joint comprising: a first expansion body, a second expansion body, and a flexible sealing filler. The first expansion body comprises a first outer cylinder, a first inner cylinder, and a first annular plate. The first outer cylinder is sleeved within the first inner cylinder. The first annular plate is sandwiched between the first outer cylinder and the first inner cylinder and is sealed to the first outer cylinder and the first inner cylinder. The first outer cylinder, the first inner cylinder, and the first annular plate enclose a first annular groove.

[0010] The second expansion body includes a second outer cylinder, a second inner cylinder and a second annular plate. The second outer cylinder is sleeved in the second inner cylinder. The second annular plate is clamped between the second outer cylinder and the second inner cylinder and is sealed with the second outer cylinder and the second inner cylinder. The second outer cylinder, the second inner cylinder and the second annular plate form a second annular groove. The opening of the first annular groove is arranged opposite to the opening of the second annular groove. The first outer cylinder extends into the second annular groove, and the second inner cylinder extends into the first annular groove.

[0011] The second annular groove is filled with a flexible sealing filler, and the insertion end of the first outer cylinder is wrapped by the flexible sealing filler.

[0012] Optionally, the flexible sealing filler is sand and gravel.

[0013] Optionally, the expansion joint further comprises a sealing ring, the inner annular surface of the sealing ring being fitted on the outer wall of the first outer cylinder and fitting on the inner wall of the second outer cylinder.

[0014] Optionally, the sealing ring is an aluminum silicate insulation cotton sealing ring.

[0015] Optionally, the expansion joint further includes a pressure plate and a tensioning member, the outer wall of the second outer cylinder is provided with a raised lug, the tensioning member connects the pressure plate and the raised lug, and the sealing ring is pressed onto the side of the pressure plate close to the second annular plate.

[0016] Optionally, the tensioning member is a tension spring.

[0017] Optionally, the pressure plate is an annular pressure plate, and the inner annular surface of the pressure plate is slidably connected to the outer wall of the first outer cylinder.

[0018] Optionally, the inner annular surface of the pressing plate is an arc surface.

[0019] Optionally, a flange is provided at one end of the first expansion body facing away from the second expansion body, and the flange is used to connect to a first pipeline.

[0020] In a second aspect, the utility model discloses a boiler slag discharge device, which includes an air distribution plate, a first pipe, a second pipe and the expansion joint described in any one of the first aspects above.

[0021] The first end of the first pipe is fixedly connected to the air distribution plate, the second end of the first pipe is connected to the first inner cylinder, the first end of the second pipe is connected to the second inner cylinder, and the second end of the second pipe is connected to the slag cooler.

[0022] Compared with the related art, the beneficial effects of this application are at least:

[0023] Because the first outer cylinder, the first inner cylinder, and the first annular plate enclose a first annular groove, and the second outer cylinder, the second inner cylinder, and the second annular plate enclose a second annular groove, the opening of the first annular groove and the opening of the second annular groove are arranged opposite each other, the first outer cylinder extends into the second annular groove, and the second inner cylinder extends into the first annular groove. In this way, the first outer cylinder can move relative to the second expansion body in the second annular groove along the axial direction or radial direction of the first outer cylinder, and at the same time, the second inner cylinder can move relative to the first expansion body in the first annular groove along the axial direction or radial direction of the second inner cylinder. In other words, the first expansion body and the second expansion body can move relative to each other along the axial direction or radial direction of the first outer cylinder.

[0024] The first inner cylinder is connected to the first pipe, and the second inner cylinder is connected to the second pipe. This allows the first pipe and the second pipe to be relatively displaced along the axial direction of the first pipe or along the radial direction of the first pipe, thereby achieving a flexible connection between the first pipe and the second pipe.

[0025] Then, since the second annular groove is filled with a flexible sealing filler, the insertion end of the first outer cylinder is wrapped with the flexible sealing filler. In this way, the flexible sealing filler can completely fill the gap between the second annular groove and the first outer cylinder, thereby forming a sealed channel inside the expansion joint and achieving a sealed connection between the first pipe and the second pipe.

[0026] In summary, when the expansion joint is used to connect the first pipeline and the second pipeline, a flexible connection and a sealed connection between the first pipeline and the second pipeline can be achieved.

[0027] The boiler slag discharge device of the present invention has the same or similar advantages as the prior art and the aforementioned expansion joint, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a structural diagram of an expansion joint provided by an embodiment of the utility model;

[0030] Figure 2 yes Figure 1 A schematic structural diagram of the expansion joint after relative displacement occurs between the first expansion body and the second expansion body;

[0031] Figure 3 yes Figure 1 A schematic structural diagram of the first expansion body in FIG;

[0032] Figure 4 yes Figure 1 A schematic structural diagram of the second expansion body in FIG.

[0033] Figure 5 yes Figure 1 The cross-sectional view of the pressure plate in FIG is formed by cutting it through a plane passing through its own axis;

[0034] Figure 6 It is a structural schematic diagram of a boiler slag discharge device provided in an embodiment of the utility model.

[0035] Description of reference numerals:

[0036] 1-expansion joint, 11-first expansion body, 111-first outer cylinder, 112-first inner cylinder, 113-first annular plate, 114-first annular groove, 115-flange, 12-second expansion body, 121-second outer cylinder, 122-second inner cylinder, 123-second annular plate, 124-second annular groove, 13-flexible sealing filler, 14-sealing ring, 15-pressing plate, 151-second connecting hole, 152-arc surface, 16-tensile member, 17-raised ear, 171-first connecting hole, 2-air distribution plate, 3-first pipeline, 4-second pipeline, 100-boiler slag discharge device, G-slag cooler. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0039] It should be understood that references throughout this specification to "some embodiments" mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present invention. Therefore, the appearance of "in some embodiments" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0040] The expansion joint and boiler slag discharge device provided by the utility model are described in detail below by listing specific embodiments.

[0041] Figure 1 This is a structural diagram of an expansion joint 1 provided by an embodiment of the present utility model. Figure 2 yes Figure 1 A schematic diagram of the structure of the expansion joint 1 after relative displacement occurs between the first expansion body 11 and the second expansion body 12, Figure 3 yes Figure 1 A schematic structural diagram of the first expansion body 11 in FIG. Figure 4 yes Figure 1 Schematic diagram of the structure of the second expansion body 12.

[0042] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The expansion joint 1 includes: a first expansion body 11, a second expansion body 12 and a flexible sealing filler 13. The first expansion body 11 includes a first outer cylinder 111, a first inner cylinder 112 and a first annular plate 113. The first outer cylinder 111 is sleeved on the first inner cylinder 112. The first annular plate 113 is sandwiched between the first outer cylinder 111 and the first inner cylinder 112 and is sealed with the first outer cylinder 111 and the first inner cylinder 112. The first outer cylinder 111, the first inner cylinder 112 and the first annular plate 113 enclose a first annular groove 114.

[0043] The second expansion body 12 includes a second outer cylinder 121, a second inner cylinder 122 and a second annular plate 123. The second outer cylinder 121 is sleeved in the second inner cylinder 122. The second annular plate 123 is clamped between the second outer cylinder 121 and the second inner cylinder 122 and is sealed with the second outer cylinder 121 and the second inner cylinder 122. The second outer cylinder 121, the second inner cylinder 122 and the second annular plate 123 are combined to form a second annular groove 124. The opening of the first annular groove 114 is arranged opposite to the opening of the second annular groove 124. The first outer cylinder 111 extends into the second annular groove 124, and the second inner cylinder 122 extends into the first annular groove 114.

[0044] The second annular groove 124 is filled with a flexible sealing filler 13 , and the insertion end of the first outer cylinder 111 is wrapped by the flexible sealing filler 13 .

[0045] In the embodiment of the present application, the first outer cylinder 111, the first inner cylinder 112, and the first annular plate 113 enclose a first annular groove 114, and the second outer cylinder 121, the second inner cylinder 122, and the second annular plate 123 enclose a second annular groove 124. The opening of the first annular groove 114 and the opening of the second annular groove 124 are arranged opposite each other. The first outer cylinder 111 extends into the second annular groove 124, and the second inner cylinder 122 extends into the first annular groove 114. In this way, the first outer cylinder 111 can move relative to the second expansion body 12 in the second annular groove 124 along the axial direction or radial direction of the first outer cylinder 111. At the same time, the second inner cylinder 122 can move relative to the first expansion body 11 in the first annular groove 114 along the axial direction or radial direction of the second inner cylinder 122. In other words, the first expansion body 11 and the second expansion body 12 can move relative to each other in the axial direction or radial direction of the first outer cylinder 111.

[0046] The first inner cylinder 112 is in communication with the first pipe 3, and the second inner cylinder 122 is in communication with the second pipe 4. This allows relative displacement between the first pipe 3 and the second pipe 4 along the axial direction of the first pipe 3 or along the radial direction of the first pipe 3, thereby achieving a flexible connection between the first pipe 3 and the second pipe 4.

[0047] Then, since the second annular groove 124 is filled with the flexible sealing filler 13, the insertion end of the first outer cylinder 111 is wrapped in the flexible sealing filler 13. In this way, the flexible sealing filler 13 can completely fill the gap between the second annular groove 124 and the first outer cylinder 111, thereby forming a sealed channel inside the expansion joint 1 and achieving a sealed connection between the first pipe 3 and the second pipe 4.

[0048] In summary, when the expansion joint 1 is used to connect the first pipeline 3 and the second pipeline 4 , a flexible connection and a sealed connection between the first pipeline 3 and the second pipeline 4 can be achieved.

[0049] It should be noted that the first outer cylinder 111 , the first inner cylinder 112 , the second outer cylinder 121 and the second inner cylinder 122 may be cylindrical or square cylinders, or cylinders of other shapes, which is not limited in the embodiment of the present application.

[0050] It should also be noted that the first annular plate 113 may be a circular ring, a square ring, or other ring shapes, the specific shape of which depends on the shapes of the first outer cylinder 111 and the first inner cylinder 112, and is not limited in this embodiment of the present application. Similarly, the second annular plate 123 may be a circular ring, a square ring, or other ring shapes, the specific shape of which depends on the shapes of the second outer cylinder 121 and the second inner cylinder 122, and is not limited in this embodiment of the present application.

[0051] It should also be noted that the above-mentioned sealing connection method can be welding or bonding, or other sealing connection methods, and the embodiments of the present application do not limit this.

[0052] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The flexible sealing filler 13 is sand and gravel. The sand and gravel is clean coarse river sand, and the range of its particle size d is d≤2mm.

[0053] In this way, the gaps between the sand and gravel are very small. When the sand and gravel are filled into the second annular groove 124 as the flexible sealing filler 13 , it is possible to prevent other fluids except gas from overflowing from the gaps of the expansion joint 1 .

[0054] In addition, since the sand and gravel are flowing solids, when the first outer cylinder 111 is relatively displaced relative to the second annular groove 124, the sand and gravel can adaptively flow and deform according to the displacement of the first outer cylinder 111 to ensure that the expansion joint 1 is always in a sealed state.

[0055] It should be noted that, in addition to sand and gravel, the flexible sealing filler 13 may also be made of flowable solids such as slag or silicon powder, and this embodiment of the present application does not limit this.

[0056] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The expansion joint 1 further includes a sealing ring 14 , the inner annular surface of the sealing ring 14 is fitted on the outer wall of the first outer cylinder 111 and the inner wall of the second outer cylinder 121 .

[0057] In this way, the sealing ring 14 can further block the gap between the first outer cylinder 111 and the second outer cylinder 121 , thereby further enhancing the sealing effect of the expansion joint 1 .

[0058] It should be noted that the sealing ring 14 can be circular or square, or other shapes, which depends on the shapes of the first outer cylinder 111 and the second outer cylinder 121, and this embodiment of the application does not limit this.

[0059] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the sealing ring 14 is an aluminum silicate insulation cotton sealing ring.

[0060] Since the aluminum silicate insulation cotton has high temperature stability, the sealing ring 14 will not be damaged by the high temperature when the high temperature fluid passes through the expansion joint 1. This not only can play a sealing role, but also can prevent itself from being damaged by the high temperature.

[0061] Specifically, aluminum silicate insulation cotton is composed of alumina and silicate as the main components. It has excellent high-temperature stability and can maintain stable performance in high-temperature environments. It is not easy to deform, shrink or melt.

[0062] In this way, when high-temperature slag passes through the expansion joint 1, the sealing ring 14 will not be damaged due to the high temperature.

[0063] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The expansion joint 1 also includes a pressure plate 15 and a tensile member 16. The outer wall of the second outer cylinder 121 is provided with a protruding ear 17. The tensile member 16 connects the pressure plate 15 and the protruding ear 17. The sealing ring 14 is pressed on the side of the pressure plate 15 close to the second annular plate 123.

[0064] In the embodiment of the present application, the tensioning member 16 can exert a force on the pressure plate 15 directed toward the protruding lug 17, thereby pressing the pressure plate 15 tightly against the surface of the sealing ring 14. Since the sealing ring 14 is deformable, it can fit more closely with the outer wall of the first outer cylinder 111 and the inner wall of the second outer cylinder 121. Therefore, the sealing performance of the expansion joint 1 can be further enhanced.

[0065] It should be noted that the pressing plate 15 can be a metal plate or a ceramic plate, or a pressing plate 15 made of other materials, which is not limited in the embodiment of the present application.

[0066] It should also be noted that the raised lug 17 is a trapezoidal plate, the longer base of which is fixedly connected to the outer surface of the second outer cylinder 121, and one end of its shorter base protrudes relative to the second outer cylinder 121. The first end of the tensioning member 16 is connected to one end of the shorter base of the raised lug 17, and the second end is connected to the outer edge of the pressure plate 15.

[0067] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the tension member 16 is a tension spring.

[0068] In the embodiment of the present application, since the tension spring has a tendency to contract when stretched, it can apply a pulling force to the pressure plate 15 directed toward the second annular plate 123 , thereby enabling the pressure plate 15 to be tightly pressed against the surface of the sealing ring 14 .

[0069] To facilitate the connection of the tension spring, a first connection hole 171 is provided at one end of the shorter bottom edge of the raised lug 17. A second connection hole 151 is provided on the outer edge of the pressure plate 15. One end of the tension spring is inserted into the first connection hole 171, and the other end of the tension spring is inserted into the second connection hole 151.

[0070] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The pressing plate 15 is an annular pressing plate 15 , and the inner annular surface of the pressing plate 15 is slidably connected to the outer wall of the first outer cylinder 111 .

[0071] In this way, when the sealing ring 14 is pressed by the pressure plate 15, the pressure applied by the pressure plate 15 to the sealing ring 14 can be evenly distributed on the surface of the sealing ring 14 along the circumference of the sealing ring 14, thereby making the deformation of the sealing ring 14 more uniform, thereby strengthening the sealing effect of the sealing ring 14.

[0072] In addition, since the inner annular surface of the pressure plate 15 is slidingly connected to the outer wall of the first outer cylinder 111, when the first expansion body 11 produces relative displacement in the axial direction relative to the second expansion body 12, the inner annular surface of the pressure plate 15 can slide relative to the outer wall of the first outer cylinder 111, thereby reducing the friction resistance when the first expansion body 11 produces relative displacement relative to the second expansion body 12, thereby making the telescopic deformation of the expansion joint 1 more flexible.

[0073] Alternatively, in some embodiments, see Figure 1 、 Figure 2 and Figure 5The inner annular surface of the pressing plate 15 is an arc surface 152. When the arc surface 152 contacts the outer wall of the first outer cylinder 111, the friction force generated at the contact surface is smaller.

[0074] In this way, when the inner annular surface of the pressure plate 15 slides relative to the outer wall of the first outer cylinder 111, the friction resistance when the first expansion body 11 is relatively displaced relative to the second expansion body 12 can be further reduced, thereby further enhancing the flexibility of the expansion joint 1 in telescopic deformation.

[0075] Alternatively, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A flange 115 is provided at one end of the first expansion body 11 away from the second expansion body 12 , and the flange 115 is used to connect to the first pipeline 3 .

[0076] Since the pipelines are connected more firmly by the flange 115 , the stability of the joint can be enhanced when the expansion joint 1 is connected to the first pipeline 3 by the flange 115 .

[0077] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The specific structure of an expansion joint 1 is as follows: the expansion joint 1 includes an upper expansion body, a lower expansion body, an upper cover plate, a tension spring, a thermal insulation cotton sealing ring, and a sand filler. Among them, the upper expansion body is the first expansion body 11, the lower expansion body is the second expansion body 12, the upper cover plate is the pressure plate 15, the tension spring is the tension member 16, the thermal insulation cotton sealing ring is the sealing ring 14, and the sand filler is the flexible sealing filler 13.

[0078] The upper expansion body includes a first inner barrel body, a first outer barrel body, a top ring and a flange 115. Among them, the first inner barrel body is the first inner cylinder 112, the first outer barrel body is the first outer cylinder 111, and the top ring is the first annular plate 113. The first inner barrel body is made of the same material as the first pipe 3. The upper end of the first inner barrel body is provided with a flange 115 connected to the first pipe 3. The height of the first inner barrel body is suitable so that it does not contact the inner wall of the hopper of the slag cooler G when the boiler is running and the gap is as small as possible. The first outer barrel body is made of a steel pipe with a diameter 200mm larger than the first inner barrel body, a wall thickness of 5 to 10mm, and the lower end is processed into a blade shape. The height of the first outer barrel body is not less than 400mm. The top ring is annular, with an aperture the same as the outer diameter of the first inner barrel body and an outer diameter the same as that of the first outer barrel body. The first inner barrel body is inserted into the inner hole of the top ring and is sealed and welded. The welding position is close to the top of the first inner barrel body. The first outer barrel body is sealed and welded to the outer circle of the top ring. The first inner barrel body, the first outer barrel body and the top ring form an annular groove opening downward.

[0079] The lower expansion body includes a second inner barrel body, a second outer barrel body and a bottom ring. Among them, the second inner barrel body is the second inner barrel body 122, the second outer barrel body is the second outer barrel body 121, and the bottom ring is the second annular plate 123. The diameter of the second inner barrel body is larger than the diameter of the first inner barrel body, and the height is equal to the height of the first outer barrel body. The second outer barrel body is made of steel pipe, the diameter is larger than the diameter of the second inner barrel body, and the height is 30mm smaller than the height of the second inner barrel body. The second outer barrel body is evenly welded with multiple raised ears 17 along the side. The bottom ring is made of 15mm thick steel plate, the inner hole diameter is the same as the outer diameter of the second inner barrel body, and the outer circle diameter is the same as the inner diameter of the second outer barrel body. The second inner barrel body and the second outer barrel body are sealed and welded along the inner ring surface and outer ring surface of the bottom ring respectively to form an annular groove opening upward.

[0080] The sealing ring 14 is made of soft aluminum silicate material, and the sand and gravel are clean coarse river sand.

[0081] The upper cover plate is put on the upper expansion body, the upper expansion body is inserted into the lower expansion body from directly above, and then the upper expansion body is connected to the first pipe 3 through the flange 115. By adjusting the length of the first pipe 3 and the second pipe 4, the vertical expansion compensation amount is ensured to be 15mm more than the expansion amount of the boiler.

[0082] The expansion joint 1 can change the compensation capacity of the expansion joint 1 by changing the size of each component to adapt to the requirements of different boiler slag discharge devices 100.

[0083] See also Figure 1 、 Figure 2 and Figure 5 The present application also discloses a boiler slag discharge device 100, comprising an air distribution plate 2, a first pipe 3, a second pipe 4, and the expansion joint 1 according to any one of the first aspects described above. A first end of the first pipe 3 is fixedly connected to the air distribution plate 2, and a second end of the first pipe 3 is in communication with the first inner cylinder 112. A first end of the second pipe 4 is in communication with the second inner cylinder 122, and a second end of the second pipe 4 is in communication with a slag cooler G.

[0084] Specifically, the first pipe 3 is located at the top, with its upper end fixedly connected to the air distribution plate 2, and its lower end communicating with the first inner cylinder 112. The second pipe 4 is located at the bottom, with its upper end communicating with the second inner cylinder 122, and its lower end communicating with the slag cooler G.

[0085] When the boiler slag discharge device 100 is used to discharge the slag in the furnace cavity to the slag cooler G, the slag first flows from the air distribution plate 2 in the furnace cavity through the first pipe 3 to the expansion joint 1, and then flows through the expansion joint 1 through the second pipe 4 into the slag cooler G.

[0086] Since the first outer cylinder 111 can move relative to the second expansion body 12 along the axial or radial direction of the first outer cylinder 111 in the second annular groove 124, at the same time, the second inner cylinder 122 can move relative to the first expansion body 11 along the axial or radial direction of the second inner cylinder 122 in the first annular groove 114. That is, the first expansion body 11 and the second expansion body 12 can move relative to each other in the vertical direction or the horizontal direction. Among them, the first inner cylinder 112 is connected to the first pipe 3, and the second inner cylinder 122 is connected to the second pipe 4. In this way, a relative position in the vertical direction or the horizontal direction can be generated between the first pipe 3 and the second pipe 4, so that a flexible connection between the first pipe 3 and the second pipe 4 can be achieved. In addition, concentrated stress between the slag discharge pipe and the slag cooler G can be avoided, so the slag discharge pipe can be prevented from being torn.

[0087] Furthermore, because the second annular groove 124 is filled with the flexible sealing filler 13, the insertion end of the first outer cylinder 111 is wrapped around the flexible sealing filler 13. This allows the flexible sealing filler 13 to completely and densely fill the gap between the second annular groove 124 and the first outer cylinder 111, thereby forming a sealed passage within the expansion joint 1 and achieving a sealed connection between the first pipe 3 and the second pipe 4. This prevents the high-temperature slag from being ejected from the gap, even when high-temperature slag and high-temperature flue gas simultaneously pass through the first pipe 3 and enter the second pipe 4, thereby ensuring safer production.

[0088] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An expansion joint (1), characterized in that: include: A first expansion body (11), the first expansion body (11) comprising a first outer cylinder (111), a first inner cylinder (112) and a first annular plate (113), the first outer cylinder (111) being sleeved on the first inner cylinder (112), the first annular plate (113) being sandwiched between the first outer cylinder (111) and the first inner cylinder (112) and being sealed to the first outer cylinder (111) and the first inner cylinder (112), the first outer cylinder (111), the first inner cylinder (112) and the first annular plate (113) forming a first annular groove (114); A second expansion body (12), the second expansion body (12) comprises a second outer cylinder (121), a second inner cylinder (122) and a second annular plate (123), the second outer cylinder (121) is sleeved on the second inner cylinder (122), the second annular plate (123) is sandwiched between the second outer cylinder (121) and the second inner cylinder (122) and is sealed with the second outer cylinder (121) and the second inner cylinder (122), the second outer cylinder (121), the second inner cylinder (122) and the second annular plate (123) enclose a second annular groove (124), the opening of the first annular groove (114) and the opening of the second annular groove (124) are arranged opposite to each other, the first outer cylinder (111) extends into the second annular groove (124), and the second inner cylinder (122) extends into the first annular groove (114); A flexible sealing filler (13), the second annular groove (124) is filled with the flexible sealing filler (13), and the insertion end of the first outer cylinder (111) is wrapped in the flexible sealing filler (13).

2. The expansion joint (1) according to claim 1, characterized in that The flexible sealing filler (13) is sand and gravel.

3. The expansion joint (1) according to claim 1, characterized in that The expansion joint (1) further comprises a sealing ring (14), the inner annular surface of which is fitted onto the outer wall of the first outer cylinder (111) and the inner wall of the second outer cylinder (121).

4. The expansion joint (1) according to claim 3, characterized in that The sealing ring (14) is an aluminum silicate thermal insulation cotton sealing ring.

5. The expansion joint (1) according to claim 3, characterized in that The expansion joint (1) further comprises a pressure plate (15) and a tensioning member (16); the outer wall of the second outer cylinder (121) is provided with a protruding lug (17); the tensioning member (16) connects the pressure plate (15) and the protruding lug (17); the sealing ring (14) is pressed onto a side of the pressure plate (15) close to the second annular plate (123).

6. The expansion joint (1) according to claim 5, characterized in that The stretching member (16) is a stretching spring.

7. The expansion joint (1) according to claim 5, characterized in that The pressure plate (15) is an annular pressure plate (15), and the inner annular surface of the pressure plate (15) is slidably connected to the outer wall of the first outer cylinder (111).

8. The expansion joint (1) according to claim 7, characterized in that The inner annular surface of the pressing plate (15) is an arc surface (152).

9. The expansion joint (1) according to claim 1, characterized in that A flange (115) is provided at one end of the first expansion body (11) facing away from the second expansion body (12), and the flange (115) is used to connect to the first pipeline (3).

10. A boiler slag discharge device (100), characterized in that: It comprises an air distribution plate (2), a first pipe (3), a second pipe (4) and an expansion joint (1) according to any one of claims 1 to 9; The first end of the first pipe (3) is fixedly connected to the air distribution plate (2), and the second end of the first pipe (3) is in communication with the first inner cylinder (112); The first end of the second pipe (4) is in communication with the second inner cylinder (122), and the second end of the second pipe (4) is in communication with the slag cooler G.

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