A protection and fixing device for mechanical seal in multi-stage pump maintenance process

Abstract

The utility model discloses a kind of protection fixing devices of mechanical seal in multistage pump maintenance process, it is related to coal chemical engineering pump maintenance technical field;Including main frame and connecting assembly;Main frame includes horizontal support plate, and first long circular groove and second long circular groove are symmetrically opened on horizontal support plate, connecting assembly includes first round steel connecting rod and second round steel connecting rod, and one end of first round steel connecting rod is connected with dog claw;One end of second round steel connecting rod is connected with clamping rod;The end of first round steel connecting rod, which is provided with threaded structure, is slidably connected in first long circular groove, and the end of second round steel connecting rod, which is provided with threaded structure, is slidably connected in second long circular groove;The utility model can effectively fix rotor, avoid mechanical seal damage, simplify maintenance process, reduce cost, improve maintenance efficiency and mechanical seal service life.

Description

Technical Field

[0001] This utility model relates to the field of maintenance technology for pumps in coal chemical machinery, specifically a protective and fixing device for mechanical seals during the overhaul of multi-stage pumps. Background Technology

[0002] A multistage pump is a high-lift device that achieves progressive pressurization of liquid by connecting multiple impellers in series. Its core structure can be divided into four major systems: stator, rotor, seal, and support. The stator includes the pump casing, guide vanes, and inlet / outlet sections. The pump casing is a horizontally split split structure or a segmented bolted connection. The guide vanes are a double volute design to balance radial forces. The guide vanes are the part that converts kinetic energy into pressure energy. The inlet / outlet sections are typically for horizontal suction and vertical upward discharge.

[0003] The rotor section includes an impeller and a pump shaft. The impellers are closed impellers connected in series and arranged back to back to automatically balance axial forces. The pump shaft is thickened to improve rigidity, and the long shaft requires an intermediate support bearing.

[0004] Sealing systems include mechanical seals (high-pressure areas) or packing seals (normal operating conditions). The support system includes bearings and couplings. The bearings are typically a combination of angular contact ball bearings and cylindrical roller bearings, grease-lubricated or forced-cooled. The couplings provide flexible shock absorption, and diaphragm type is easy to maintain.

[0005] During the maintenance of multi-stage pumps, the pump shaft center needs to be repeatedly adjusted. When the pump shaft center on one side of the pump body is adjusted, the mechanical seal between the pump shaft and the bearing on the other side of the pump body will be damaged. This requires repeated adjustment of the pump shaft center and mechanical seal on both sides of the pump body, which increases the risk of mechanical seal damage and prolongs the maintenance time. Utility Model Content

[0006] This utility model overcomes the shortcomings of the prior art and proposes a protective fixing device for the mechanical seal during the maintenance of a multi-stage pump. To achieve the above objectives, this utility model is implemented through the following technical solution: A protective fixing device for the mechanical seal during the maintenance of a multi-stage pump includes a main frame and connecting components; the main frame includes a horizontal support plate, on which a first elongated groove is symmetrically formed, and a second elongated groove is symmetrically formed, with the first elongated groove located outside the second elongated groove. The connecting assembly includes a first round steel connecting rod and a second round steel connecting rod. One end of the first round steel connecting rod and one end of the second round steel connecting rod are provided with a threaded structure. The other end of the first round steel connecting rod is connected to a claw. The claw is used to clamp and fix it on the pump cover of the multi-stage pump. The other end of the second round steel connecting rod is connected to a clamping rod. The clamping rod is used to clamp and fix it on the coupling of the multi-stage pump. One end of the first round steel connecting rod with a threaded structure is slidably connected in the first elongated cylindrical groove, and a first bolt is connected to the threaded structure of the first round steel connecting rod, which fixes the first round steel connecting rod and the horizontal support plate. One end of the second round steel connecting rod with a threaded structure is slidably connected in the second elongated cylindrical groove, and a second bolt is connected to the threaded structure of the second round steel connecting rod, which fixes the second round steel connecting rod and the horizontal support plate.

[0007] Furthermore, the horizontal support plate is made of channel steel.

[0008] Furthermore, the inner diameter and length of the first elongated circular groove are both greater than the inner diameter and length of the second elongated circular groove.

[0009] Furthermore, graduations are provided along the long sides of the first and second elongated grooves.

[0010] Furthermore, the length of the first round steel connecting rod is greater than the length of the second round steel connecting rod.

[0011] Furthermore, a set screw is connected to the claw.

[0012] Furthermore, the snap-fit ​​rod is perpendicular to the second round steel connecting rod.

[0013] The beneficial effects of this utility model compared to the prior art are as follows: This utility model proposes a multi-stage pump maintenance mechanical seal protection and fixing device, which can effectively fix the rotor, avoid damage to the mechanical seal, simplify the maintenance process, reduce costs, and improve maintenance efficiency and mechanical seal service life.

[0014] 1. High versatility: The connecting components of this utility model are adjustable, adaptable to different models and sizes of multi-stage pumps, thus expanding the application range.

[0015] 2. Simple and reliable structure: Made of common steel, with low manufacturing cost. The design of claws and buckles ensures firm installation and effectively fixes the rotor.

[0016] 3. Improve maintenance efficiency: No need to repeatedly adjust the pump shaft center, reducing the risk of mechanical seal damage and shortening maintenance time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the protective fixing device of this utility model connected to the multi-stage pump; Figure 2 yes Figure 1 A sectional view along line AA in the middle; In the diagram: 1. Horizontal support plate; 2. First elongated groove; 3. Second elongated groove; 4. First round steel connecting rod; 5. Second round steel connecting rod; 6. Claw; 7. Connecting rod; 8. First bolt; 9. Second bolt; 10. Set screw; 11. Pump cover; 12. Pump shaft; 13. Bearing; 14. Coupling; 15. Pump body. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0019] See Figures 1 to 2 This embodiment proposes a protective fixing device for the mechanical seal during the maintenance of a multi-stage pump, including a main frame and connecting components; The main frame includes a horizontal support plate 1 made of channel steel. The length of the horizontal support plate 1 is adapted to the installation space at the free end of the multi-stage pump, and the width and thickness ensure structural strength. A first elongated circular groove 2 and a second elongated circular groove 3 are symmetrically formed on the horizontal support plate 1. The inner diameter and length of the first elongated circular groove 2 are both larger than the inner diameter and length of the second elongated circular groove 3. The first elongated circular groove 2 is located outside the second elongated circular groove 3. Scale markings are provided along the long sides of the first elongated circular groove 2 and the second elongated circular groove 3.

[0020] The connecting assembly includes a first round steel connecting rod 4 and a second round steel connecting rod 5. One end of the first round steel connecting rod 4 and one end of the second round steel connecting rod 5 are both provided with a threaded structure. The other end of the first round steel connecting rod 4 is connected to a claw 6. A set screw 10 is connected to the claw 6. The other end of the second round steel connecting rod 5 is connected to a locking rod 7. The locking rod 7 is perpendicular to the second round steel connecting rod 5.

[0021] The length of the first round steel connecting rod 4 is greater than the length of the second round steel connecting rod 5; one end of the first round steel connecting rod 4 with a threaded structure is slidably connected in the first elongated circular groove 2, and a first bolt 8 is connected to the threaded structure of the first round steel connecting rod 4, thereby fixing the first round steel connecting rod 4 and the horizontal support plate 1 together; one end of the second round steel connecting rod 5 with a threaded structure is slidably connected in the second elongated circular groove 3, and a second bolt 9 is connected to the threaded structure of the second round steel connecting rod 5, thereby fixing the second round steel connecting rod 5 and the horizontal support plate 1 together; The multistage pump has an existing structure, including a pump body 15, with pump covers 11 at both ends of the pump body 15; a pump shaft 12 is rotatably connected to the center of the pump body 15 along an axis; both ends of the pump shaft 12 pass through the pump covers 11 at both ends and are rotatably connected to the pump covers 11; a bearing 13 is connected to the pump shaft 12; a coupling 14 is connected to one end of the pump shaft 12; and a mechanical seal is provided between the pump cover 11 and the pump shaft 12.

[0022] When overhauling the pump shaft 12 and bearing 13 on one side of the pump body 15, the mechanical seal between the pump shaft 12 and the pump cover 11 on the other side of the pump body 15 will be affected and thus fail. It is often necessary to repeatedly adjust the center of the pump shaft on both sides of the pump body 10, and after adjusting one side, the mechanical seal on the other side will fail. The protective fixing device described in this utility model can effectively solve this problem. Its specific usage method is as follows: Taking the P215A three-line pump as an example: 1. Preparation: Measure the dimensions of the free end of the pump body 15, including the distance between the connecting parts of the pump body 15 and the rotor shaft diameter, etc. Adjust the position of the pawl 6 of the protection and fixing device so that the distance between the two first round steel connecting rods 4 is appropriate and the opening angle of the pawl 6 corresponds to the pump cover 11.

[0023] 2. First, move the two jaws 6 to both sides of the pump cover 11 and make both sides of the pump cover 11 inside the jaws 6. Tighten the set screw 10 to fix the jaws 6 and the pump cover 11. 3. Tighten the first bolt 8 at the other end of the first round steel connecting rod 4 to fix the first round steel connecting rod 4 to the horizontal support plate 1; at this time, the scale value on the outside of the first elongated groove 2 can be read to determine the approximate diameter of the pump cover 11, in preparation for subsequent operations. 4. Insert one end of the threaded structure of the second round steel connecting rod 5 into the second long round groove 3, and adjust the position of the second round steel connecting rod 5 in the second long round groove 3 so that the snap-fit ​​rod 7 is snapped into the inner side of the coupling 14. At this time, fix the second round steel connecting rod 5, the horizontal support plate 1, and the coupling 14 by the second bolt 9.

[0024] The above connection operation can fix the pump shaft 12 and the pump cover 11 on the other side of the pump body 15 into a whole. When the bearing 13 on one side of the pump body 15 is inspected and repaired, it will not affect the mechanical seal between the pump shaft 12 and the pump cover 11 on the other side of the pump body 15, and will not cause the mechanical seal to fail.

[0025] After installation, check the firmness and reliability of the fixing device. Through actual maintenance and testing, ensure that the pump shaft can be effectively fixed without displacement or rotation during maintenance, ensuring efficient and safe maintenance and improving equipment maintenance efficiency.

[0026] It should be noted that by setting the scale, the adjustment accuracy of the distance between the two jaws 6 can be improved to ±1mm, which can be adapted to the free end size of different pump models and improve the installation efficiency of the device.

[0027] The protective fixing device can also reserve a local pressure gauge installation position. During maintenance, the free end mechanical seal is pressurized and connected to the local pressure gauge to monitor the pressure changes in the mechanical seal cavity in real time, ensuring that the sealing condition is stable and the mechanical seal is in good condition during maintenance.

[0028] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump, characterized in that, It includes a main frame and connecting components; the main frame includes a horizontal support plate (1), on which a first elongated groove (2) is symmetrically opened, and on which a second elongated groove (3) is symmetrically opened, the first elongated groove (2) being located outside the second elongated groove (3); The connecting assembly includes a first round steel connecting rod (4) and a second round steel connecting rod (5). One end of the first round steel connecting rod (4) and one end of the second round steel connecting rod (5) are both provided with threaded structures. The other end of the first round steel connecting rod (4) is connected to a claw (6). The claw (6) is used to clamp and fix it on the pump cover (11) of the multi-stage pump. The other end of the second round steel connecting rod (5) is connected to a clamping rod (7). The clamping rod (7) is used to clamp and fix it on the coupling (14) of the multi-stage pump. The first round steel connecting rod (4) has a threaded end that is slidably connected in the first long round groove (2), and the first bolt (8) is connected to the threaded structure of the first round steel connecting rod (4). The first bolt (8) fixes the first round steel connecting rod (4) and the horizontal support plate (1) in place. The second round steel connecting rod (5) has a threaded end that is slidably connected in the second long round groove (3), and the second bolt (9) is connected to the threaded structure of the second round steel connecting rod (5). The second bolt (9) fixes the second round steel connecting rod (5) and the horizontal support plate (1) in place.

2. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 1, characterized in that, The horizontal support plate (1) is a channel steel.

3. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 1, characterized in that, The inner diameter and length of the first elongated circular groove (2) are both greater than the inner diameter and length of the second elongated circular groove (3).

4. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 3, characterized in that, Gratings are provided along the long side of the first elongated groove (2) and the second elongated groove (3).

5. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 1, characterized in that, The length of the first round steel connecting rod (4) is greater than the length of the second round steel connecting rod (5).

6. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 1, characterized in that, The jaw (6) is connected to a set screw (10).

7. The protective and fixing device for the mechanical seal during the maintenance of a multi-stage pump according to claim 1, characterized in that, The snap-fit ​​rod (7) is perpendicular to the second round steel connecting rod (5).

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