Steel expansion piece for pipeline

Abstract

The utility model relates to the technical field of pipeline connection, in particular to a steel expansion piece for a pipeline, which comprises a limiting short pipe, a placing shell is integrally arranged on the outer pipe wall at the flange connecting end of the limiting short pipe, the interior of the placing shell is communicated with the interior of the limiting short pipe, and mounting plates are symmetrically arranged on the upper surface and the lower surface of the interior of the placing shell. A telescopic rod is detachably and fixedly arranged on the mounting plate, an adjusting block is detachably and fixedly arranged at the telescopic end of the telescopic rod, and an adjusting plate is detachably and fixedly arranged on the opposite face of the side face, connected with the telescopic rod, of the adjusting block; according to the steel expansion piece for the pipeline, the adjusting block can drive the adjusting plate on the adjusting block to be matched with the sealing strips on the upper side and the lower side, so that the cross sectional area of an inner pipe channel at the position is reduced, the flow speed of media in the inner pipe and the end is further changed, the impact force of the media on the annular groove is increased, and dirt attached to the groove wall is easily loosened and stripped; faults and maintenance are reduced, the service life of the expansion piece is prolonged, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a steel expansion joint for pipelines. Background Art

[0002] Pipe expansion joints are mainly used to transport various media similar to sewage, such as seawater, fresh water, hot and cold water, drinking water, domestic sewage, crude oil, fuel oil, lubricating oil, refined oil, etc. According to the connection between the flanges on both sides and the pipeline or pipeline equipment, it can effectively play the role of a flexible element to compensate for axial deformation. It mainly absorbs the displacement of the pipeline through its own elastic deformation. The types of pipeline expansion joints are mainly divided into the following types: SSQ cast iron expansion joints, SF steel expansion joints, CS heat pipe expansion joints, SSLW filter expansion joints, etc.

[0003] SSQ cast iron expansion joint is also called expansion joint and compensation joint. This product provides great convenience for the installation and replacement of drainage pipes, water towers, water pumps and water meter valves, and plays a good regulating role in the expansion and contraction of long-distance pipelines due to temperature differences. The inner pipes of SSQ cast iron expansion joint are divided into three types: cast iron (HF), galvanized (DX) and steel (SF). The working pressures are divided into PN6, PN10 and PN16. Before installation, the gland bolts must be loosened, the product must be pulled to the installation length, and then tightened diagonally. When the existing pipeline steel expansion joint is in use, a circle of annular grooves will be formed at the connection port between the expansion joint body and the limit short pipe. Through long-term conveying of the medium, the annular groove is easy to hide dust and accumulate dirt, which in turn affects the digestion, absorption and compensation effect of the pipeline expansion joint in the axial force direction. Utility Model Content

[0004] The purpose of the invention of the utility model is to overcome the defects described in the background technology, thereby realizing a steel expansion joint for pipelines, which can make the adjustment block drive the adjustment plate thereon to cooperate with the sealing strips on the upper and lower sides, so that the cross-sectional area of ​​the inner pipe channel at this place becomes smaller, thereby changing the flow rate of the inner pipe and the end medium, thereby increasing the impact force on the annular groove, making it easy to loosen and peel off the dirt attached to the groove wall, reducing failures and maintenance, extending the service life of the expansion joint, and improving its working efficiency.

[0005] To achieve the above-mentioned purpose of the invention, the technical solution of the utility model is: a steel expansion joint for a pipeline, comprising a limiting short tube, the outer tube wall at the flange connection end of the limiting short tube is integrally provided with a placement shell, the interior of the placement shell is connected to the interior of the limiting short tube, and mounting plates are symmetrically arranged on the upper and lower surfaces of the placement shell, a telescopic rod is detachably fixedly arranged on the mounting plate, an adjustment block is detachably fixedly arranged on the telescopic end of the telescopic rod, and an adjustment plate is detachably fixedly arranged on the opposite surface of the side where the adjustment block is connected to the telescopic rod.

[0006] In the above steel expansion joint for pipeline, the side surface and the opposite surface of the adjusting block connected to the expansion rod are both arc-shaped surfaces, and the top surface and the bottom surface of the adjusting block are planes parallel to each other.

[0007] In the above-mentioned steel expansion joint for pipeline, the height and width of the adjusting block are consistent with the height and width of the inner cavity of the placement shell.

[0008] In the above-mentioned steel expansion joint for pipelines, sealing strips are provided at positions corresponding to the inner walls of the limiting short tubes at the top and bottom surfaces of the adjusting block, one side of the sealing strip is an arcuate surface which is fixedly fitted with the inner wall of the limiting short tube, and the other side of the sealing strip is a plane which is fitted with the top and bottom surfaces of the adjusting block.

[0009] In the above steel expansion joint for pipeline, one end of the sealing strip is flush with the side surface of the adjustment block away from the body, and the other end is close to the annular groove formed by the interface of the body and the limiting short pipe.

[0010] In the above-mentioned steel expansion joint for pipeline, the adjustment plate has the same length as the sealing strip, and the adjustment plate is vertically arranged on the side of the adjustment block below the sealing strip.

[0011] In the above steel expansion joint for pipeline, a waterproof sleeve is provided on the outer side of the expansion rod, one end of the waterproof sleeve is detachably fixed to the mounting plate, and the other end of the waterproof sleeve is detachably fixed to the side wall of the adjustment block.

[0012] In the above-mentioned steel expansion joint for pipeline, the waterproof sleeve and the sealing strip are both made of rubber material.

[0013] Compared with the prior art, the steel expansion joint for pipeline of the utility model has at least the following beneficial effects:

[0014] The utility model discloses a steel expansion joint for pipelines. The device can control an adjusting block to extend from a placement shell through a telescopic rod, and the adjusting block drives an adjusting plate thereon to fit with sealing strips on the upper and lower sides of the inner tube wall of a limiting short tube, so that the cross-sectional area of ​​the inner tube channel at that location becomes smaller, thereby changing the fluid flow rate at that location and the flow rate at the end of the adjusting plate, increasing the impact force of the fluid on the annular groove, thereby loosening and peeling off dirt attached to the groove wall, reducing failures and maintenance, extending the service life of the expansion joint, and improving its working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the steel expansion joint for pipelines of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the main body of the steel expansion joint for pipelines of the utility model;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of a limiting short pipe of a steel expansion joint for a pipeline of the utility model;

[0018] Figure 4 It is a side view structural diagram of a steel expansion joint for a pipeline of the utility model;

[0019] Figure 5 It is a schematic diagram of the overall top view cross-sectional structure of the steel expansion joint for pipelines of the utility model;

[0020] Figure 6 The utility model is a schematic diagram of the fluid flow direction of the steel expansion joint for pipelines.

[0021] In the figure: 1. short limiting tube; 2. placement shell; 3. mounting plate; 4. telescopic rod; 5. adjustment block; 6. adjustment plate; 7. main body; 8. sealing strip; 9. waterproof cover; 10. annular groove. DETAILED DESCRIPTION

[0022] The steel expansion joint for pipeline of the utility model is described in more detail below with reference to the accompanying drawings and through specific implementation methods.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The steel expansion joint for pipelines of this embodiment is shown in Figure 1-Figure 6 The device can make the adjustment block drive the adjustment plate thereon to cooperate with the sealing strips on the upper and lower sides, so that the cross-sectional area of ​​the inner tube channel at this place becomes smaller, thereby changing the flow rate of the inner tube and the end, increasing the impact force on the annular groove, making it easy to loosen and peel off the dirt attached to the groove wall, reducing failures and maintenance, extending the service life of the telescope, and improving its working efficiency. It includes a limiting short tube 1, and the outer tube wall at the flange connection end of the limiting short tube 1 is integrally provided with a placement shell 2, and a chamber is opened in the placement shell 2, and the internal chamber of the placement shell 2 is connected to the inside of the limiting short tube 1, and the upper and lower surfaces of the placement shell 2 are symmetrically fixedly provided with mounting plates 3, and the mounting plate 3 is detachably fixedly provided with a telescopic rod 4.

[0025] In order to change the inner diameter of the pipe near the main body of the steel expansion joint, in this embodiment, refer to Figure 3The telescopic end of the telescopic rod 4 is detachably fixed with an adjustment block 5. The side and the opposite surface of the adjustment block 5 connected to the telescopic rod 4 are both arc-shaped surfaces, so as to form a delivery channel approximately cylindrical with the inner wall of the relative limiting short tube 1, so that the internal fluid pressure borne by the inner wall point of the radial section of the inner tube at this location is approximately equal, which helps to prevent the inner tube from stress concentration due to uneven pressure resistance, and then deformation affects the sealing performance. The top and bottom surfaces of the adjustment block 5 are parallel planes to each other, and the height and width of the adjustment block 5 are consistent with the height and width of the internal cavity of the placement shell 2. When the telescopic rod 4 is contracted and adjusted, the adjustment block 5 shrinks into the internal cavity of the placement shell 2 and fits with the chamber. The outer side of the telescopic rod 4 is provided with a waterproof cover 9, one end of which is detachably fixed on the mounting plate 3, and the other end is detachably fixed on the side wall of the adjustment block 5. Preventing the medium from penetrating into the interior of the telescopic rod 4, thereby protecting the telescopic rod 4 from damage, thereby extending the service life of the telescopic rod 4, and the detachable design makes it easy to replace and clean, thereby increasing the service life of the telescopic device.

[0026] In order to make the inner diameter of the pipe near the body form an approximately cylindrical tubular inner wall, in this embodiment, see Figure 2-Figure 4 A sealing strip 8 is provided at the corresponding position of the inner wall of the limiting short tube 1 at the top and bottom surfaces of the adjusting block 5. One side of the sealing strip 8 is an arc surface, which is fixedly fitted with the inner wall of the limiting short tube 1. The other side of the sealing strip 8 is a plane, which is fitted with the top and bottom surfaces of the extended adjusting block 5, so that the inner diameter of the inner tube of the limiting short tube 1 near the body 7 forms an inner wall that is approximately cylindrical. One end of the sealing strip 8 is flush with the side of the adjusting block 5 away from the body 7, and the other end is close to the annular groove 10 formed by the interface between the body 7 and the limiting short tube 1. The waterproof cover 9 and the sealing strip 8 are both made of rubber material.

[0027] In this embodiment, see Figure 3-Figure 5 , an adjustment plate 6 is detachably fixedly provided on the opposite surface of the side where the adjustment block 5 is connected to the telescopic rod 4. The adjustment plate 6 is the same length as the sealing strip 8, and the adjustment plate 6 is vertically fixedly provided on the arc-shaped side of the adjustment block 5 below the sealing strip 8. Therefore, the inner diameter of the section of the pipeline from the adjustment block 5 to the vicinity of the main body 7 is constructed to form an inner wall that is approximately cylindrical, so that when the fluid medium passes through the reduced flow cross-section, the flow velocity of the fluid medium increases, that is, the flow velocity is inversely proportional to the flow cross-section. It can be understood that if we assume that the fluid is incompressible, then if Figure 6 As shown in the figure, the particle follows the streamline from point 1 to point 2, so the mass flow rate at point 1 and point 2 must be the same.

[0028] m1=m2 (1)

[0029] Mass flow rate refers to the mass of fluid passing through the effective cross-section of a closed pipe or open slot per unit time. Corresponding to volume flow rate (volume of fluid passing per unit time), it can be expressed as the product of volume flow rate and fluid density.

[0030] m=ρAV (2)

[0031] Therefore, from (1) (2) we can get

[0032] ρA1V1=ρA2V2 (3)

[0033] After deformation

[0034]

[0035] Obviously, from (4), when the fluid flows from point 1 to point 2, the cross-sectional area of ​​the pipe at point 1 is larger than that at point 2, that is, A1>A2, so V2>V1, and the impact force of the fluid on the annular groove 10 increases, thereby loosening and peeling off the dirt attached to the groove wall.

[0036] When the fluid medium flows in the constructed pipe, the increase in flow velocity is accompanied by a decrease in fluid pressure, and low pressure is generated near the fluid, thereby generating an adsorption effect, which in turn adsorbs the dirt in the annular groove, causing it to be peeled off and carried away by the fluid.

[0037] According to Bernoulli's principle,

[0038]

[0039] Substituting point 1 and point 2 into (5), we can obtain

[0040]

[0041] Since there is no significant difference in height between point 1 and point 2, after eliminating the potential energy term, we get:

[0042]

[0043] Substituting (4) into (7), we get

[0044]

[0045] It can be obtained that P1>P2, that is, the increase in flow rate is accompanied by a decrease in fluid pressure, which will generate low pressure near the fluid, thereby producing adsorption.

[0046] The working principle of the steel expansion joint for pipelines of the utility model is as follows: the device can control the adjustment block 5 to extend from the placement shell 2 through the telescopic rod 4, and the adjustment block 5 drives the adjustment plate 6 thereon to fit with the sealing strips 8 on the upper and lower sides of the inner tube wall of the limiting short tube 1, so that the cross-sectional area of ​​the inner tube channel at this location becomes smaller, thereby changing the fluid flow rate at this location and the flow rate at the end of the adjustment plate 6, so that the impact force of the fluid on the annular groove 10 is increased, thereby loosening and peeling off the dirt attached to the groove wall. When the fluid medium flows in the constructed pipe, the increase in flow rate is also accompanied by a decrease in fluid pressure, and low pressure is generated near the fluid, thereby generating an adsorption effect, thereby adsorbing the dirt in the annular groove 10 and causing it to be carried away by the fluid. Therefore, the failure and maintenance of the expansion joint can be reduced, the service life of the expansion joint can be extended, and the working efficiency can be improved.

[0047] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The use of "one" or "an" and other similar words in the specification and claims of this application does not necessarily indicate a quantitative limitation. "Include" or "comprises" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0048] The exemplary implementation of the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various combinations of the various technical features and structures proposed in the present invention can be made without exceeding the protection scope of the present invention.

Claims

1. A steel expansion joint for a pipeline, characterized in that: The invention comprises a positioning short tube (1), wherein the outer tube wall at the flange connection end of the positioning short tube (1) is integrally provided with a placement shell (2), the interior of the placement shell (2) is communicated with the interior of the positioning short tube (1), and mounting plates (3) are symmetrically arranged on the upper and lower surfaces of the placement shell (2), a telescopic rod (4) is detachably fixedly arranged on the mounting plate (3), an adjustment block (5) is detachably fixedly arranged at the telescopic end of the telescopic rod (4), and an adjustment plate (6) is detachably fixedly arranged on the opposite surface of the side where the adjustment block (5) is connected to the telescopic rod (4).

2. The steel expansion joint for pipeline according to claim 1, characterized in that: The side surface and the opposite surface of the adjusting block (5) connected to the telescopic rod (4) are both arc-shaped surfaces, and the top surface and the bottom surface of the adjusting block (5) are planes parallel to each other.

3. The steel expansion joint for pipeline according to claim 1, characterized in that: The height and width of the adjustment block (5) are consistent with the height and width of the internal cavity of the placement shell (2).

4. The steel expansion joint for pipeline according to claim 3, characterized in that: Sealing strips (8) are provided at positions corresponding to the inner wall of the limiting short tube (1) at the top and bottom surfaces of the adjusting block (5); one side of the sealing strip (8) is an arcuate surface, which is fixedly fitted with the inner wall of the limiting short tube (1); the other side of the sealing strip (8) is a plane, which is fitted with the top and bottom surfaces of the adjusting block (5).

5. The steel expansion joint for pipeline according to claim 4, characterized in that: One end of the sealing strip (8) is flush with the side of the adjustment block (5) away from the body (7), and the other end is close to the annular groove (10) formed by the interface between the body (7) and the limiting short tube (1).

6. The steel expansion joint for pipeline according to claim 5, characterized in that: The adjustment plate (6) has the same length as the sealing strip (8), and the adjustment plate (6) is vertically arranged on the side of the adjustment block (5) below the sealing strip (8).

7. The steel expansion joint for pipeline according to claim 1, characterized in that: The outer side of the telescopic rod (4) is provided with a waterproof sleeve (9), one end of the waterproof sleeve (9) is detachably fixed to the mounting plate (3), and the other end is detachably fixed to the side wall of the adjustment block (5).

8. The steel expansion joint for pipeline according to claim 7, characterized in that: The waterproof cover (9) and the sealing strip (8) are both made of rubber material.

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