Elastic buffer type expansion joint

Abstract

The utility model belongs to the field of expansion joints, and particularly relates to an elastic buffer type expansion joint. The expansion joint comprises a vertically arranged expansion joint body, a plurality of positioning sleeves are vertically fixed to the upper end of the outer side wall of the expansion joint body, a plurality of mounting plates aligned with the positioning sleeves are horizontally fixed to the lower end of the outer side wall of the expansion joint body, outer pipes are detachably and vertically mounted on all the mounting plates, and inner rods are independently mounted in all the positioning sleeves in a penetrating mode; the lower end of each inner rod is independently arranged in the corresponding outer pipe in a penetrating mode, a locking assembly is arranged between each positioning sleeve and the corresponding inner rod, the lower end of each inner rod is sleeved with a steel ball sleeve, and the upper end of each outer pipe is detachably sleeved with a sealing cover used for preventing the steel ball sleeve from disengaging. Buffering assemblies are arranged between all the sealing covers and the corresponding adjusting assemblies. The service life of the expansion joint is prolonged, and the situation that working personnel misjudge the use state of the expansion joint due to abnormal sound generated during telescopic deformation is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of expansion joints, in particular to an elastic buffer type expansion joint. Background Art

[0002] Expansion joints, also known as compensators, are devices used to absorb thermal expansion and contraction deformation caused by temperature changes, mechanical displacement and other factors in pipeline systems. They protect equipment and prevent stress damage in pipeline systems. Expansion joints are widely used in various industrial and engineering fields, especially in pipeline systems that need to cope with thermal expansion and contraction or mechanical displacement, such as urban central heating systems, building water supply and drainage systems, boilers, steam turbines and steam pipeline systems.

[0003] When the existing expansion joint is in use, it is necessary to install several support rods between the flanges at both ends of the existing expansion joint body, and the support rods are used to support and fix the expansion joint body to prevent excessive displacement or deformation during operation. When the expansion joint body is retracting, the support rods can guide the direction of its movement to ensure that it is retracted in a predetermined direction and avoid unnecessary lateral movement. By adjusting the length or position of the support rods, the telescopic range of the support rods can be adjusted to meet different working conditions. However, when the existing expansion joint is retracted along the support rods, friction will occur between the support rods and the installation part, and the two ends of the support rods on the existing expansion joints are mostly threads. The threads on the two ends of the support rods are very easy to be damaged during the friction with the installation part, which affects the service life of the expansion joint, and strange noises will be emitted during the friction, which may easily cause the staff to misjudge the use status of the expansion joint. Utility Model Content

[0004] The utility model aims to provide an elastic buffer expansion joint, which can improve the service life of the expansion joint and avoid abnormal noise during telescopic deformation, thereby preventing staff from misjudging the use status of the expansion joint.

[0005] The elastic buffering expansion joint comprises a vertically arranged expansion joint body, a plurality of positioning sleeves are vertically fixed to the upper end of the outer side wall of the expansion joint body, a plurality of mounting plates respectively aligned with the positioning sleeves are horizontally fixed to the lower end of the outer side wall of the expansion joint body, outer tubes are detachably mounted vertically on all mounting plates, inner rods are independently installed in all positioning sleeves, the lower end of each inner rod is independently installed in the outer tube aligned therewith, a locking assembly for locking the inner rod after movement is arranged between all positioning sleeves and the corresponding inner rods, a steel ball sleeve for reducing the friction between the inner rod and the outer tube is sleeved on the lower end of each inner rod, a sealing cover for preventing the steel ball sleeve from falling out is detachably sleeved on the upper end of the outer tube, and a buffer assembly for buffering the force exerted on the expansion joint body is arranged between all sealing covers and the corresponding adjustment assemblies.

[0006] Furthermore, the locking assembly includes a limiting nut, the upper end of the inner rod is provided with an external thread, the limiting nut is sleeved on the upper end of the inner rod and threadedly matched therewith, the limiting nut is fitted with the top of the positioning sleeve, the upper end of the inner rod is sleeved with a locking nut threadedly matched therewith, and the locking nut is fitted with the bottom of the positioning sleeve.

[0007] Furthermore, the buffer assembly includes two buffer washers, a spring is independently mounted on the inner rod, the spring is located between the locking nut and the sealing cover, the two buffer washers are independently mounted on the inner rod, one of the buffer washers is located between the upper end of the spring and the locking nut, and the other buffer washer is located between the lower end of the spring and the sealing cover.

[0008] Furthermore, the inner rods are all provided with protective washers, which are located between the limiting nut and the positioning sleeve on the inner rod.

[0009] Furthermore, the inner rods are each independently sleeved with a protective sleeve, and the protective sleeve is located between the positioning sleeve and the inner rod.

[0010] Furthermore, chamfers are provided at the corners between the inner side walls and the top of all outer tubes.

[0011] Furthermore, all the inner side walls of the positioning sleeves are provided with beveled corners between the top and the bottom.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] When the expansion joint body is telescopically moved, it will drive the lower end of the inner rod to move along the inside of the outer tube, and the steel ball sleeve mounted on the lower end of the inner rod can achieve gapless cooperation with the outer tube, and when the inner rod moves along the inside of the outer tube to guide the direction of the telescopic movement of the expansion joint body, it can be more accurate, avoiding excessive displacement or deformation of the expansion joint body during telescopic movement, ensuring accurate telescopic movement of the expansion joint body, and when the steel ball sleeve moves, the steel balls thereon will roll along the inner tube wall of the outer tube, avoiding direct friction contact between the inner rod and the inner tube wall of the outer tube, and the friction between the steel balls and the inner tube wall of the outer tube is small, thereby avoiding wear between the inner rod and the outer tube, increasing the service life of the inner rod and the outer tube, and avoiding strange noises due to excessive friction between the inner rod and the outer tube, preventing staff from misjudging the use status of the expansion joint due to strange noises. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a three-dimensional diagram of the utility model;

[0016] Figure 3 It is an exploded view of the utility model;

[0017] The names of the components in the figure are: 1, inner rod 2, limit nut 3, protective washer 4, protective sleeve 5, expansion joint body 6, mounting plate 7, outer tube 8, steel ball sleeve 9, sealing cover 10, buffer washer 11, spring 12, locking nut 13, positioning sleeve. DETAILED DESCRIPTION

[0018] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0019] Example 1

[0020] The elastic buffer expansion joint described in this embodiment is as follows Figure 1 , Figure 2 and Figure 3 As shown, it includes a vertically arranged expansion joint body 5, the expansion joint body 5 includes a bellows and two flanges, and the two flanges are fixed to the ends of both ends of the bellows;

[0021] A plurality of positioning sleeves 13 are vertically fixed to the upper end of the outer side wall of the expansion joint body 5, and a plurality of mounting plates 6 are horizontally fixed to the lower end of the outer side wall of the expansion joint body 5, which are respectively aligned with the positioning sleeves 13. The positioning sleeves 13 are circular sleeves. In this embodiment, the positioning sleeves 13 and the mounting plates 6 are respectively in three groups, and all the positioning sleeves 13 are evenly fixed on the outer circumferential surface of the flange at the upper end of the expansion joint body 5 along the circumferential direction, and all the mounting plates 6 are evenly fixed on the outer circumferential surface of the flange at the lower end of the expansion joint body 5 along the circumferential direction;

[0022] All mounting plates 6 are detachably vertically mounted with outer tubes 7, and all mounting plates 6 are provided with blind holes at the top for inserting the outer tubes 7; internal threads are provided in the blind holes, and internal threads are provided at the lower ends of all outer tubes 7 for threaded engagement therewith; the outer tubes 7 are detachably fixed vertically to the top of the mounting plates 6 by threaded engagement, so that the staff can disassemble and assemble the outer tubes 7; of course, the outer tubes 7 can also be fixed by screws, and a through hole is provided at the top of the mounting plates 6, which is connected from top to bottom and is used for inserting the outer tubes 7, and a mounting hole is provided on the side wall of the mounting plates 6 for the screws to pass through and which is connected to the through hole, and a threaded hole is provided on the outer tubes 7 corresponding to the mounting hole for threaded engagement with the screws, and during installation, the lower end of the outer tube 7 is inserted into the through hole, and then the threaded end of the screw is inserted through the installation, and the threaded end is inserted into the threaded hole for threaded engagement therewith;

[0023] All the positioning sleeves 13 are independently installed with inner rods 1, and the inner rods 1 can move in the corresponding positioning sleeves 13. During installation, the inner rods 1 can be moved up and down to adjust the length of the lower end of the inner rods 1 passing through the positioning sleeves 13; the inner rods 1 are round rods;

[0024] All the corners between the inner side wall and the top and bottom of the positioning sleeve 13 are provided with bevels; during the installation process, if Figure 1 As shown, when the inner rod 1 is inserted into the positioning sleeve 13 from bottom to top or from top to bottom, the bevel can guide the inner rod 1, so that the inner rod 1 can be inserted into the positioning sleeve 13 more easily, thereby facilitating installation by the staff;

[0025] The lower end of each inner rod 1 is independently installed in the outer tube 7 aligned with it, and the lower end of the inner rod 1 can move along the inside of the outer tube 7, and the outer tube is a circular tube; the inner rod 1 and the outer tube 7 are made of carbon steel, alloy steel, alloy, stainless steel and other materials;

[0026] To further explain, Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment preferably includes a limit nut 2, the upper end of the inner rod 1 is provided with an external thread, the limit nut 2 is sleeved on the upper end of the inner rod 1 and threadedly matched therewith, the limit nut 2 is fitted with the top of the positioning sleeve 13, the upper end of the inner rod 1 is sleeved with a locking nut 12 threadedly matched therewith, and the locking nut 12 is fitted with the bottom of the positioning sleeve 13; when the upper end of the inner rod 1 is inserted into the positioning sleeve 13, by adjusting the positions of the limit nut 2 and the locking nut 12 on the inner rod 1, the limit nut 2 and the locking nut 12 are moved and clamped and fitted at the upper and lower ends of the positioning sleeve 13, thereby locking the inner rod 1, and by adjusting the limit nut 2 and the locking nut upward or downward at the same time 12 is positioned on the inner rod 1, the length of the positioning sleeve 13 through which the lower end of the inner rod 1 passes is adjusted, and the overall telescopic length of the outer tube 7 and the inner rod 1 is adjusted, thereby adjusting the telescopic range of the expansion joint body 5; this scheme as a whole constitutes a locking component for locking the moved inner rod 1. Of course, the locking component can also use a positioning pin. A through hole communicating with the inside and outside is opened on the side wall of the positioning sleeve 13, and a plurality of positioning holes arranged at equal intervals are opened along the length direction of the inner rod 1. One end of the positioning pin passes through the through hole and is installed in one of the positioning holes aligned with it. The positioning pin and the through hole are in an interference fit, so that the positioning pin is not easy to loosen, thereby locking the moved inner rod 1.

[0027] The inner rod 1 is provided with a protective washer 3, which is located between the limit nut 2 and the positioning sleeve 13; when the expansion joint body 5 is extended, the positioning sleeve 13 is driven to move upward, so that the positioning sleeve 13 is tightly fitted with the limit nut 2, and the protective washer 3 can isolate the limit nut 2 and the positioning sleeve 13, prevent wear between the limit nut 2 and the positioning sleeve 13, and avoid the limit nut 2 or the positioning sleeve 13 from being damaged too easily;

[0028] The inner rod 1 is independently covered with a protective sleeve 4, which is located between the positioning sleeve 13 and the inner rod 1; the protective sleeve 4 is made of rubber, nylon, PTFE and other materials, and is mainly used to protect the threads on the upper end of the inner rod 1 to prevent excessive friction between the inner wall of the positioning sleeve 13 and the inner rod 1, which may cause the threads on the upper end of the inner rod 1 to fail, and can effectively increase the service life of the inner rod 1, thereby reducing the maintenance frequency of the expansion joint and reducing the use cost;

[0029] The lower end of each inner rod 1 is sleeved with a steel ball sleeve 8 for reducing the friction between the inner rod 1 and the outer tube 7. The steel ball sleeve is mainly composed of a matrix and steel balls. The matrix is ​​processed into a number of regular holes according to industry standards, and the steel balls are installed therein. The steel balls can move flexibly and are not easy to fall off; the steel ball sleeve has high-precision axial movement and radial movement, and adopts interference fit when used with the shaft and the sleeve, which can achieve gapless assembly and has extremely high combination accuracy. Therefore, it is widely used in the mold industry, the machinery and equipment industry, and industries with high-precision operation or movement; in this embodiment, the steel ball sleeve 8 is sleeved on the lower end of the inner rod 1; when the expansion joint body 5 telescopes, it will drive the inner rod 1 and the outer tube 7 to move, so that the lower end of the inner rod 1 moves along the inside of the outer tube 7, and when the inner rod 1 drives the steel ball sleeve 8 to move in the outer tube 7, the steel balls The sleeve 8 can achieve a gapless fit with the outer tube 7. When the inner rod 1 moves along the inner side of the outer tube 7 to guide the direction of the telescopic movement of the expansion joint body 5, it can be more accurate, avoiding excessive displacement or deformation of the expansion joint body 5 during the telescopic movement, ensuring accurate telescopic movement of the expansion joint body 5, and when the steel ball sleeve 8 moves, the steel balls thereon will roll along the inner tube wall of the outer tube 7, avoiding direct friction contact between the inner rod 1 and the inner tube wall of the outer tube 7, and the friction between the steel balls and the inner tube wall of the outer tube 7 is small, thereby avoiding wear between the inner rod 1 and the outer tube 7, improving the service life of the inner rod 1 and the outer tube 7, and avoiding strange noises due to excessive friction between the inner rod 1 and the outer tube 7, preventing the staff from misjudging the use status of the expansion joint due to strange noises;

[0030] All corners between the inner side wall and the top of the outer tube 7 are chamfered; during the installation process, when the lower end of the inner rod 1 drives the steel ball sleeve 8 to be inserted into the outer tube 7, the chamfer can guide the inner rod 1 and the steel ball sleeve 8, so that the lower end of the inner rod 1 and the steel ball sleeve 8 can enter the outer tube 7 more easily, thereby facilitating the installation of the staff;

[0031] The upper end of the outer tube 7 is detachably provided with a sealing cover 9 for preventing the steel ball sleeve 8 from coming out. The sealing cover 9 is installed on the upper end of the outer tube 7 by threaded cooperation. The sealing cover 9 is provided with an internal thread, and the upper end of the outer tube 7 is provided with an external thread. The sealing cover 9 is installed on the upper end of the outer tube 7 by cooperation of the internal and external threads. Of course, the sealing cover 9 can also be installed on the upper end of the outer tube 7 by screws. The side wall of the sealing cover 9 is provided with a threaded hole threadedly matched with the screw, and the threaded end of the screw passes through the threaded hole on the outer tube 7; Figure 1 As shown, a through hole is provided at the top of the sealing cover 9 for the lower end of the outer tube 7 to pass through, and the steel ball sleeve 8 sleeved on the lower end of the outer tube 7 is blocked by the sealing cover 9 to prevent the steel ball sleeve 8 and the lower end of the inner rod 1 sleeved with the steel ball sleeve 8 from escaping from the outer tube 7;

[0032] To further explain, Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, two buffer washers 10 are preferably included, a spring 11 is independently mounted on the inner rod 1, the spring 11 is located between the locking nut 12 and the sealing cover 9, and the two buffer washers 10 are independently mounted on the inner rod 1, one of the buffer washers 10 is located between the upper end of the spring 11 and the locking nut 12, and the other buffer washers 10 is located between the lower end of the spring 11 and the sealing cover 9; in this embodiment, the buffer washers 10 are made of polystyrene foam (such as EPS), polyurethane foam (PU), EVA foam, silicone and other materials; when the expansion joint body 5 contracts, it will drive the inner rod 1 to move in the direction of the outer tube 7, and the outer tube 7 moves in the direction of the inner rod 1, so that the two buffer washers 10 are respectively in the locking nut 12 and The spring 11 is squeezed under the push of the sealing cover 9, and the spring 11 contracts under the squeezing, and the thrust forcing the expansion joint body 5 to contract and the elastic force of the spring 11 will be buffered by the two buffer washers 10. When the expansion joint body 5 is extended, the elastic force of the spring 11 can push the positioning sleeve 13, so that the positioning sleeve 13 drives the inner rod 1 to reset, and at the same time can assist the expansion joint body 5 to extend or reset, effectively increasing the working efficiency of the expansion joint; this scheme as a whole constitutes a buffer component for buffering the force exerted on the expansion joint body 5; of course, the buffer component can also use a buffer rubber sleeve, which is mounted on the inner rod 1 and is located between the locking nut 12 and the sealing cover 9, and the force exerted on the expansion joint body 5 is buffered by the buffer rubber sleeve.

[0033] In actual use, when the expansion joint body 5 contracts, the inner rod 1 is driven to move toward the outer tube 7 through the positioning sleeve 13, and the outer tube 7 moves toward the direction of the inner rod 1, so that the two buffer washers 10 squeeze the spring 11 under the push of the locking nut 12 and the sealing cover 9 respectively, and the spring 11 contracts under the extrusion, forcing the thrust of the expansion joint body 5 to contract and the elastic force of the spring 11 to be buffered by the two buffer washers 10, and the inner rod 1 drives the steel ball sleeve 8 to move in the outer tube 7, and the steel balls on the steel ball sleeve 8 roll along the inner tube wall of the outer tube 7 to avoid direct friction contact between the inner rod 1 and the inner tube wall of the outer tube 7. The movement of the inner rod 1 along the inside of the outer tube 7 can guide the direction of the telescopic movement of the expansion joint body 5, and prevent the expansion joint body 5 from excessive displacement or deformation during the telescopic movement; when the expansion joint body 5 is extended, the elastic force of the spring 11 can push the positioning sleeve 13, so that the positioning sleeve 13 drives the inner rod 1 to move and reset, and at the same time can assist the expansion joint body 5 to extend or reset, effectively increasing the working efficiency of the expansion joint.

Claims

1. An elastic buffer expansion joint, comprising a vertically arranged expansion joint body (5), characterized in that: A plurality of positioning sleeves (13) are vertically fixed to the upper end of the outer wall of the expansion joint body (5), a plurality of mounting plates (6) respectively aligned with the positioning sleeves (13) are horizontally fixed to the lower end of the outer wall of the expansion joint body (5), an outer tube (7) is detachably mounted vertically on all mounting plates (6), an inner rod (1) is independently inserted into all positioning sleeves (13), the lower end of each inner rod (1) is independently inserted into the outer tube (7) aligned therewith, a locking assembly for locking the inner rod (1) after movement is arranged between all positioning sleeves (13) and the corresponding inner rod (1), a steel ball sleeve (8) for reducing the friction between the inner rod (1) and the outer tube (7) is sleeved on the lower end of each inner rod (1), a sealing cover (9) for preventing the steel ball sleeve (8) from falling out is detachably sleeved on the upper end of the outer tube (7), and a buffer assembly for buffering the force applied to the expansion joint body (5) is arranged between all sealing covers (9) and the corresponding adjustment assembly.

2. The elastic buffer expansion joint according to claim 1, characterized in that: The locking assembly comprises a limiting nut (2), the upper end of the inner rod (1) is provided with an external thread, the limiting nut (2) is sleeved on the upper end of the inner rod (1) and threadedly matched therewith, the limiting nut (2) is fitted with the top of a positioning sleeve (13), the upper end of the inner rod (1) is sleeved with a locking nut (12) threadedly matched therewith, and the locking nut (12) is fitted with the bottom of the positioning sleeve (13).

3. The elastic buffer expansion joint according to claim 2 is characterized in that: The buffer assembly comprises two buffer washers (10), a spring (11) is independently mounted on the inner rod (1), the spring (11) is located between a locking nut (12) and a sealing cover (9), the two buffer washers (10) are independently mounted on the inner rod (1), one of the buffer washers (10) is located between the upper end of the spring (11) and the locking nut (12), and the other buffer washers (10) is located between the lower end of the spring (11) and the sealing cover (9).

4. The elastic buffer expansion joint according to claim 2 is characterized in that: The inner rod (1) is provided with a protective washer (3), and the protective washer (3) is located between the limiting nut (2) and the positioning sleeve (13) on the inner rod (1).

5. The elastic buffer expansion joint according to claim 2, characterized in that: The inner rod (1) is independently sleeved with a protective sleeve (4), and the protective sleeve (4) is located between the positioning sleeve (13) and the inner rod (1).

6. The elastic buffer expansion joint according to claim 1, characterized in that: The corners between the inner side walls and the tops of all the outer tubes (7) are chamfered.

7. The elastic buffer expansion joint according to claim 1, characterized in that: All the positioning sleeves (13) have beveled corners at the corners between the inner side walls and the top and bottom.

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