Rubber expansion joint backflow device

Abstract

The utility model relates to the technical field of pulping equipment, and particularly discloses a rubber expansion joint backflow device which comprises a circulating pump installed on a pulp mill, an expansion joint is arranged at a pipeline outlet of the circulating pump, an inner lining plate is arranged in an outlet area of the expansion joint, one end of the inner lining plate is arranged on a reducing joint of the expansion joint, and the other end of the inner lining plate is arranged on a sealing ring. The other end extends to the inner surface of the expansion joint from the outlet and is pressed on the expansion joint; the inner lining plate is of an arc-shaped structure, and the arc length of the inner lining plate is one third to one half of the circumference length of the expansion joint. The inner surface of the easy-to-wear part of the expansion joint is shielded, so that the expansion joint is prevented from being directly scoured by slurry due to bias flow, and the service life of the expansion joint is prolonged and the production and maintenance cost is reduced under the condition that the function of the expansion joint is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of pulping equipment technology, specifically to a rubber expansion joint backflow device. Background Technology

[0002] In a pulping system, the mill recirculation pump circulates the ground slurry to designated locations within the system to ensure the continuity and efficiency of the pulping process. To prevent damage caused by deformation of the recirculation pump piping due to temperature changes, an expansion joint is installed at the mill recirculation pump outlet. Currently, most expansion joints are made of rubber, utilizing the elastic element of the expansion joint to protect the piping system from stress and damage caused by displacement.

[0003] However, in actual operation, the slurry contains a large number of solid particles and corrosive substances. Under the action of the high-speed flowing slurry, these substances continuously erode and wear down the inner wall of the rubber expansion joint, resulting in a significant reduction in the service life of the expansion joint. According to statistics, the average service life of this type of expansion joint is only 7 days, and in extreme cases, the shortest operating time is only 3 days before leakage occurs due to severe wear.

[0004] Damage to expansion joints not only leads to slurry leakage, increasing the workload of on-site cleaning and maintenance, and affecting the cleanliness and civilized production level of the production environment, but more importantly, frequent replacement and repair severely affects the continuous and stable operation of the pulping system, reducing equipment reliability and overall production efficiency. Furthermore, slurry leakage may also pollute the surrounding environment, increasing environmental risks.

[0005] Therefore, in order to solve the problem of severe wear and short service life of the expansion joint at the outlet of the existing mill recirculation pump, it is now necessary to provide a rubber expansion joint backflow device. Utility Model Content

[0006] The present invention aims to provide a rubber expansion joint backflow device to solve the problem of severe wear and short service life of the existing mill recirculation pump outlet expansion joint.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a rubber expansion joint backflow device, which can alleviate the problem of severe wear and frequent replacement of expansion joints, while ensuring the performance of expansion joints and effectively extending their service life. Specifically, the device includes a circulating pump installed on a slurry mill, with an expansion joint at the outlet of the circulating pump. An inner liner plate is provided in the outlet area of ​​the expansion joint. One end of the inner liner plate is located on the reducing joint of the expansion joint, and the other end extends from the outlet to the inner surface of the expansion joint and presses against it. The inner liner plate has an arc-shaped structure, and the arc length of the inner liner plate is one-third to one-half of the circumference of the expansion joint.

[0009] The principles and advantages of this scheme are:

[0010] Rubber expansion joints are widely used to absorb axial, radial, and angular displacements in pipelines caused by temperature changes, pressure fluctuations, or media flow due to their good flexibility, corrosion resistance, and certain elasticity. This protects the pipeline from stress and damage caused by displacement. However, due to the material properties and application environment of expansion joints, they need to be located outside the pipeline and have sufficient strain space and elasticity to ensure their protective function. Consequently, expansion joints must be installed on the inner wall of the pipeline and in contact with the slurry. This leads to direct impact from the slurry on the expansion joint, causing severe wear problems.

[0011] However, due to the need for elastic expansion joints, and the inability to fully coat or add anti-wear structures to the surface of the expansion joints, the expansion joints can easily lose their effectiveness, making it difficult to protect the pipeline and thus causing greater accidents and losses. This makes it difficult to effectively solve the problems of wear and durability of expansion joints.

[0012] Therefore, after careful observation and analysis of the causes and locations of wear on the expansion joint, this solution reveals that the wear is not primarily due to impact, but rather to the uneven flow of the slurry. The slurry fails to fill the entire cross-section of the pipeline, resulting in uneven flow distribution. Consequently, the wear is concentrated on the outer part of the pump outlet, while other areas experience less wear. Based on this, this solution employs a semi-circular inner liner plate at the wear location to shield the inner surface of the easily worn areas of the expansion joint, thus preventing the slurry from directly eroding the joint due to uneven flow. Simultaneously, the inner liner plate does not completely cover or restrict the expansion joint, ensuring its activity and providing shock absorption and expansion for the pipeline. This achieves wear protection for the expansion joint without compromising its function, extending its service life, while also simplifying the structure and reducing manufacturing costs.

[0013] Furthermore, the inner lining plate is formed by bending a trapezoidal sheet material structure. This allows it to be applied to expansion joints with various structures, enhancing versatility and flexibility.

[0014] Furthermore, the upper bottom edge of the inner liner is located on the reducing joint. This facilitates installation, ensures the stability of the inner liner, and does not affect the use of the expansion joint, thus guaranteeing its normal operation.

[0015] Furthermore, the lower bottom edge of the inner liner plate presses against the inner surface of the expansion joint. Providing a wider bottom edge inside the expansion joint effectively increases the wear-resistant area, reduces the impact of flow deviation, and does not restrict the expansion or deformation of the expansion joint.

[0016] Furthermore, the inner liner plate has an upper bottom edge length of 150mm, a lower bottom edge length of 250mm, and a height of 180mm. The specific dimensions of the inner liner plate are determined based on the wear location and area to minimize wear on the expansion joint while reducing constraints on it.

[0017] Furthermore, the thickness of the inner liner is 2-4mm. This ensures the wear resistance of the inner liner, effectively extending its service life, while not affecting the inner diameter space of the expansion joint, thus ensuring shock absorption and expansion effects.

[0018] Furthermore, the inner lining plate is fixed to the reducing joint by half-width welding.

[0019] Furthermore, the inner liner is disposed on the inner edge of the upper flange of the reducing joint.

[0020] Furthermore, the inner lining plate is made of stainless steel to ensure its stability and wear resistance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a rubber expansion joint backflow device according to the present invention;

[0022] Figure 2 This is a schematic diagram of the planar structure of the inner liner of a rubber expansion joint backflow device according to this utility model;

[0023] Figure 3 This is a top view of a rubber expansion joint backflow device according to the present invention. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] The reference numerals in the accompanying drawings include: expansion joint 1, inner flange 2, and reducing joint 3.

[0026] Example 1

[0027] This embodiment is basically as shown in the appendix. Figure 1As shown: A rubber expansion joint backflow device is provided, in which a semi-circular inner liner is installed at the wear location of the expansion joint to prevent the slurry from eroding the expansion joint while ensuring the damping and expansion function of the expansion joint. It includes a circulating pump installed on a slurry mill, with an expansion joint 1 located at the outlet of the circulating pump's pipe. An inner liner 2 is welded to the outlet area of ​​the expansion joint 1, with one end of the inner liner 2 attached to the reducing joint 3 of the expansion joint 1, and the other end extending from the outlet to the inner surface of the expansion joint 1 and pressing against it.

[0028] In this embodiment, as shown in the appendix Figure 2 As shown, the inner lining plate 2 is made of stainless steel plate with a thickness of 2-4mm, and the specific thickness can be set to 3mm to ensure the strength and stability of the inner lining plate 2, and improve its wear resistance and corrosion resistance. (See attached image) Figure 3 As shown, the inner lining plate 2 is an arc-shaped structure formed by bending a plate structure with a trapezoidal plane. The arc length of the inner lining plate 2 is one-third to one-half of the circumference of the expansion joint 1, so as to ensure that it protects the main wear position of the expansion joint 1 without affecting the performance of the expansion joint.

[0029] In this embodiment, the inner liner 2 has an upper bottom edge length of 150mm, a lower bottom edge length of 250mm, and a height of 180mm. The upper bottom edge of the inner liner 2, i.e., the shorter side (150mm), is welded to the inner edge of the upper flange of the expansion joint 1 on the wear side of the expansion joint 1, following the arc of the pump outlet reducer 3. In this embodiment, the inner liner 2 is fixed to the reducer 1 using a half-width welding method to ensure the expansion joint's damping and expansion function. The lower bottom edge of the inner liner 2, i.e., the longer side, is pressed against the inner surface of the expansion joint 1 as much as possible to protect the wear area of ​​the expansion joint 1 without affecting its performance.

[0030] The specific implementation process is as follows:

[0031] As attached Figure 1 To be continued Figure 3 As shown, during installation, the inner liner 2 is bent into an arc shape according to the dimensions and structure of the wear side of the expansion joint 1 outlet. The bottom edge of the inner liner 2 is inserted into the pipe of the expansion joint 1, and the top edge of the inner liner 2 is welded to the inner edge of the flange of the reducer 3 on the wear side of the expansion joint using a half-width welding method. Then, the bottom edge of the inner liner 2 is pressed as much as possible against the inner surface of the expansion joint 1, so that the inner liner 2 rests against the surface of the wear area of ​​the expansion joint 1. After installation, it is put into use.

[0032] In this embodiment, after a careful and in-depth analysis of the wear location and cause of expansion joint 1, it was found that the main cause of wear on expansion joint 1 was slurry deviation, resulting in the wear area being concentrated at the outlet of expansion joint 1. Therefore, based on this finding, a localized protective method can be used to prevent wear on the worn areas of the expansion joint. This is achieved by using a simple and low-cost inner liner structure to shield the wear location of expansion joint 1, achieving wear prevention without altering the original circulating pump structure. Simultaneously, the damping and expansion functions of expansion joint 1 are preserved, without affecting its inherent performance.

[0033] During the implementation of this solution, the service life of expansion joint 1 was effectively improved, greatly mitigating the problem of easy wear and frequent replacement of expansion joint 1. According to actual data, the service life of expansion joint 1 in this embodiment was increased from 3-7 days to half a year, greatly improving the efficiency of expansion joint use, ensuring the stability and safety of slurry production, and reducing production and maintenance costs.

[0034] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A rubber expansion joint reversing device, comprising a circulating pump installed on a slurry mill, wherein an expansion joint is provided at the outlet of the circulating pump pipe, characterized in that: An inner liner is provided in the outlet area of ​​the expansion joint. One end of the inner liner is located on the reducing joint of the expansion joint, and the other end extends from the outlet to the inner surface of the expansion joint and presses against the expansion joint. The inner liner has an arc-shaped structure, and the arc length of the inner liner is one-third to one-half of the circumference of the expansion joint.

2. The rubber expansion joint backflow device according to claim 1, characterized in that: The inner lining is formed by bending a trapezoidal sheet material structure.

3. The rubber expansion joint backflow device according to claim 2, characterized in that: The upper bottom edge of the inner lining plate is located on the reducing joint.

4. The rubber expansion joint backflow device according to claim 2, characterized in that: The bottom edge of the inner liner plate presses against the inner surface of the expansion joint.

5. The rubber expansion joint backflow device according to claim 2, characterized in that: The inner lining plate has an upper bottom edge length of 150mm, a lower bottom edge length of 250mm, and a height of 180mm.

6. The rubber expansion joint backflow device according to claim 1, characterized in that: The thickness of the inner lining plate is 2-4 mm.

7. The rubber expansion joint backflow device according to claim 1, characterized in that: The inner lining plate is fixed to the reducing joint by half-width welding.

8. The rubber expansion joint backflow device according to claim 1, characterized in that: The inner liner is located on the inner edge of the upper flange of the reducing joint.

9. A rubber expansion joint backflow device according to claim 2, characterized in that: The inner lining plate is made of stainless steel.

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