A packaged mechanical seal apparatus

Abstract

This invention relates to the field of mechanical seal technology, specifically to a cartridge mechanical seal device, comprising a housing, a shaft horizontally mounted on the cylindrical axis of the housing, penetrating the left and right side walls of the housing, a plurality of mounting holes for installation on the right flange wall of the housing, a fixed ring mounted on the right side wall inside the housing, the fixed ring and the shaft being concentrically fitted together, a friction plate mounted on the left side of the fixed ring, a rotating ring movably fitted on the shaft, the right side of the rotating ring engaging with the friction plate, a groove on the rotating ring containing a sealing ring engaging with the shaft, a spring seat fitted on the shaft, a main spring fitted on the right side of the spring seat, the other end of the main spring fitted onto the rotating ring, allowing for flexible adjustment of the pressure of the rotating ring on the friction plate according to external pressure to adapt to different working conditions, reducing wear and heat of the friction plate while ensuring sealing effect, and extending service life.

Description

Technical Field

[0001] This invention relates to the field of mechanical seal technology, specifically to a cartridge-type mechanical seal device. Background Technology

[0002] A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps and reactors. Because the drive shaft runs through the inside and outside of the equipment, there is a circumferential clearance between the shaft and the equipment. If the pressure inside the equipment is lower than the external pressure, the external medium will leak into the equipment. The mechanical seal is the device that prevents this leakage.

[0003] Existing mechanical seals have only a few main structural parts, are simple in structure and have relatively low component costs, and have stable performance, and have been widely used in various industries.

[0004] Existing technologies use the elastic force of springs or the magnetic force of magnetic materials to apply pressure to soft sealing materials, utilizing the elasticity and self-lubricating properties of the soft sealing materials to prevent leakage at the shaft end face. In existing mechanical seal equipment, the elastic force of springs or the magnetic force of magnetic materials are mostly fixed. When the external pressure changes, insufficient pressure on the soft sealing material can lead to leakage of the mechanical seal, while excessive pressure on the soft sealing material can cause overheating and accelerated wear.

[0005] Therefore, a containerized mechanical seal device is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a cartridge mechanical seal device that uses an adjustable clamping device to adjust the pressure of the rotating ring on the friction plate, thereby solving the problems mentioned in the background art.

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

[0008] A cartridge-type mechanical seal device, comprising:

[0009] The outer casing has a shaft horizontally mounted on its cylindrical axis that penetrates the left and right side walls of the casing, and the right flange wall of the outer casing has multiple mounting holes for installation.

[0010] A fixed ring is installed on the right side wall inside the housing. The fixed ring and the shaft are concentrically fitted together. A friction plate is installed on the left side of the fixed ring.

[0011] A rotating ring is movably sleeved on the shaft. The right side of the rotating ring cooperates with the friction plate. The rotating ring has a groove, and a sealing ring is installed in the groove. The sealing ring cooperates with the shaft.

[0012] A spring seat is sleeved on the shaft, a main spring is sleeved on the right side of the spring seat, and the other end of the main spring is sleeved on the rotating ring;

[0013] Also includes:

[0014] An adjustable clamping device is also installed on the housing. The adjustable clamping device is used to adjust the pressure of the moving ring on the friction plate.

[0015] Preferably, the adjustable clamping device includes an adjusting ring, which is installed on the left side wall of the housing. The adjusting ring is threadedly connected to the housing, and the adjusting ring cooperates with the spring seat.

[0016] Preferably, a thrust ball bearing is installed at the right end of the adjusting ring, and the right end of the thrust ball bearing cooperates with the spring seat.

[0017] Preferably, the adjusting ring is equipped with a plurality of radial ball bearings, the outer ring of the radial ball bearings mates with the adjusting ring, and the inner ring of the radial ball bearings mates with the shaft.

[0018] Preferably, the adjusting ring is fitted with an anti-loosening nut, which is located on the left outer wall of the housing.

[0019] Preferably, the adjusting ring is equipped with a ring pointer, and a scale is fixedly installed on the left side wall of the outer casing.

[0020] Preferably, two adjustment handles are installed on the left side of the adjustment ring.

[0021] Preferably, the fixed ring has an annular groove on the left side, in which multiple wear switches are installed. The moving ring has an annular protrusion on the right side, and the annular protrusion cooperates with the annular groove. When the friction plate is not worn, the distance between the annular protrusion and the wear switch is half the thickness of the friction plate. The wear switch is electrically connected to an external alarm.

[0022] Preferably, the part of the moving ring that contacts the main spring is a groove, and the right side of the main spring is fitted inside the groove.

[0023] Preferably, the main spring is a rectangular helical spring.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Compared with existing mainstream cartridge mechanical seal equipment, this invention can adjust the pressure of the rotating ring on the friction plate. It can flexibly adjust the pressure of the rotating ring on the friction plate according to the external pressure to adapt to different working conditions. When the external pressure increases, the pressure of the rotating ring on the friction plate is increased to ensure the sealing effect. When the external pressure decreases, the pressure of the rotating ring on the friction plate is decreased to reduce the wear and heat of the friction plate and extend the service life of the friction plate.

[0026] 2. The adjustable clamping device of the mechanical seal equipment is equipped with a scale and a ring pointer, which can clearly observe the depth of the adjusting ring screwed into the housing. By adjusting the change in the depth of the adjusting ring screwed into the housing, the increase in the elastic force on the main spring can be calculated by Hooke's Law, thereby determining the pressure increase of the moving ring on the friction plate.

[0027] 3. The grooves on the spring seat and the moving ring restrict the eccentric rotation of the main spring, ensuring a uniform distribution of the main spring thrust. At the same time, the main spring is a rectangular helical spring. Compared with ordinary circular helical springs, the characteristic curve of a rectangular helical spring is closer to a straight line. The whole system has better coaxial stability, can distribute the pressure of the main spring more evenly, reduce the spring offset, reduce the wear of the friction plate caused by uneven pressure distribution, and thus greatly improve the reliability of the mechanical seal equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the appearance of the present invention;

[0029] Figure 2 This is a diagram of the internal structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the appearance of the adjusting ring of the present invention;

[0031] Figure 4 For the present invention Figure 2 Enlarged view of part A.

[0032] In the diagram: 1. Shaft; 2. Housing; 21. Mounting hole; 22. Scale; 3. Fixed ring; 31. Wear switch; 4. Friction plate; 5. Moving ring; 51. Sealing ring; 6. Main spring; 7. Spring seat; 8. Adjusting ring; 81. Thrust ball bearing; 82. Radial ball bearing; 83. Nut; 84. Ring pointer; 85. Adjusting handle. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 4 This invention provides a containerized mechanical seal device, the technical solution of which is as follows:

[0035] A cartridge-type mechanical seal device, comprising:

[0036] The outer casing 2 has a shaft 1 horizontally mounted on its cylindrical axis, penetrating the left and right side walls of the outer casing 2. The right flange wall of the outer casing 2 is provided with multiple mounting holes 21 for installation.

[0037] Fixed ring 3 is installed on the right inner wall inside the outer casing 2. Fixed ring 3 and shaft 1 are concentrically fitted together. Friction plate 4 is installed on the left side of fixed ring 3.

[0038] A rotating ring 5 is movably sleeved on the shaft 1. The right side of the rotating ring 5 cooperates with the friction plate 4. The rotating ring 5 has a groove, and a sealing ring 51 is installed in the groove. The sealing ring 51 and the shaft 1 cooperate with each other.

[0039] Spring seat 7 is sleeved on shaft 1. A main spring 6 is sleeved on the right side of spring seat 7. The other end of the main spring 6 is sleeved on the moving ring 5.

[0040] Also includes:

[0041] An adjustable clamping device is also installed on the outer casing 2. The adjustable clamping device is used to adjust the pressure of the moving ring 5 on the friction plate 4.

[0042] During the rotation of shaft 1, the main spring 6 on spring seat 7 pushes the moving ring 5 to the right. The moving ring 5 will press the friction plate 4 installed on the fixed ring 3 to the right, and the elasticity and self-lubricating properties of the friction plate 4 will be used to prevent leakage at the end face of shaft 1.

[0043] The pressure of the rotating ring 5 on the friction plate 4 directly determines the sealing effect. However, excessive pressure from the rotating ring 5 on the friction plate 4 can also cause the friction plate 4 to overheat and wear more, reducing the life of the friction plate 4. The adjustable clamping device installed on the housing 2 can adjust the pressure of the rotating ring 5 on the friction plate 4 according to the actual working conditions, so as to reduce the wear of the friction plate 4 while ensuring the sealing effect and improving the service life of the entire mechanical seal equipment.

[0044] As one embodiment of the present invention, refer to Figures 1 to 3 The adjustable clamping device includes an adjusting ring 8. The adjusting ring 8 is installed on the left side wall of the housing 2. The adjusting ring 8 and the housing 2 are connected by threads, and the adjusting ring 8 cooperates with the spring seat 7.

[0045] To increase the pressure of the moving ring 5 on the friction plate 4, rotate the adjusting ring 8 on the left side wall of the outer casing 2 towards the direction closer to the outer casing 2. At this time, the adjusting ring 8 pushes the spring seat 7 to the right. Since the fixed ring 3 is installed on the right inner wall inside the outer casing 2, pushing the spring seat 7 to the right will compress the main spring 6. At this time, the compression of the main spring 6 increases, and the main spring 6 provides additional thrust to the fixed ring 3 to the right, thus increasing the pressure of the moving ring 5 on the friction plate 4.

[0046] When it is necessary to reduce the pressure of the moving ring 5 on the friction plate 4, rotate the adjusting ring 8 on the left side wall of the outer casing 2 away from the outer casing 2. As the adjusting ring 8 moves away from the outer casing 2, the main spring 6 will push the spring seat 7 towards the adjusting ring 8. At this time, the compression of the main spring 6 decreases, and the thrust of the main spring 6 on the moving ring 5 decreases, thus reducing the pressure of the moving ring 5 on the friction plate 4.

[0047] As one embodiment of the present invention, refer to Figure 2 The right end of the adjusting ring 8 is equipped with a thrust ball bearing 81, and the right end of the thrust ball bearing 81 cooperates with the spring seat 7.

[0048] Shaft 1 rotates, and adjusting ring 8 is threaded onto housing 2. Driven by shaft 1, spring seat 7 rotates relative to adjusting ring 8 to a certain extent. Adjusting ring 8 always maintains a large thrust on spring seat 7. While ensuring the support force of shaft 1, the thrust ball bearing 81 installed at the right end of adjusting ring 8 can greatly reduce the friction between adjusting ring 8 and spring seat 7, improve the transmission efficiency of the system, and reduce the energy loss of the system.

[0049] As one embodiment of the present invention, refer to Figure 2 Multiple radial ball bearings 82 are installed on the adjusting ring 8. The outer ring of the radial ball bearing 82 is fitted with the adjusting ring 8, and the inner ring of the radial ball bearing 82 is fitted with the shaft 1.

[0050] Shaft 1 rotates and passes through adjusting ring 8. Adjusting ring 8 needs to provide centripetal support force to shaft 1. Multiple centripetal ball bearings 82 are set between adjusting ring 8 and shaft 1 to ensure that adjusting ring 8 provides centripetal support force to shaft 1 while reducing friction between adjusting ring 8 and shaft 1, improving transmission efficiency and reducing system energy loss.

[0051] As one embodiment of the present invention, refer to Figure 2 and Figure 3 The adjusting ring 8 is fitted with an anti-loosening nut 83, which cooperates with the outer wall of the left side of the outer casing 2.

[0052] During operation, the equipment inevitably generates some vibration. The threaded connection between the adjusting ring 8 and the outer shell 2 is prone to loosening under vibration conditions. After setting the mating position of the adjusting ring 8 into the outer shell 2, tighten the anti-loosening nut 83 installed on the adjusting ring 8 along the adjusting ring 8 towards the left outer wall of the outer shell 2. This can prevent the adjusting ring 8 and the outer shell 2 from loosening to a certain extent. When it is necessary to adjust the mating position of the adjusting ring 8 and the outer shell 2, the anti-loosening nut 83 should first be screwed out in the direction away from the outer shell 2. After setting the mating position of the adjusting ring 8 and the outer shell 2, tighten the anti-loosening nut 83 along the adjusting ring 8 towards the left outer wall of the outer shell 2.

[0053] As one embodiment of the present invention, refer to Figure 2 and Figure 3 The adjusting ring 8 is equipped with a ring pointer 84, and a scale 22 is fixedly installed on the left side wall of the outer casing 2.

[0054] The ring pointer 84 mounted on the adjusting ring 8 and the scale 22 mounted on the left side wall of the outer casing 2 work together to clearly observe the depth to which the adjusting ring 8 is screwed into the outer casing 2, calculate the change in the depth of the adjusting ring 8 being screwed into the outer casing 2, and then calculate the increase in the elastic force on the main spring 6 through Hooke's Law. Thus, the pressure increment of the moving ring 5 on the friction plate 4 can be determined, and the pressure increment of the moving ring 5 on the friction plate 4 can be controlled relatively accurately.

[0055] As one embodiment of the present invention, refer to Figure 2 and Figure 3 Two adjustment handles 85 are installed on the left side of the adjustment ring 8.

[0056] Because a scale 22 is installed on the upper part of the left side wall of the outer casing 2, there is no position where force can be applied near the outer casing 2 to adjust the position of the adjusting ring 8 when it is necessary to adjust the fitting position of the adjusting ring 8 into the outer casing 2. This can be achieved by pulling the two adjusting handles 85 on the adjusting ring 8 to adjust the fitting position of the adjusting ring 8 into the outer casing 2, thereby adjusting the pressure of the moving ring 5 on the friction plate 4.

[0057] As one embodiment of the present invention, refer to Figure 2 and Figure 4 The fixed ring 3 has an annular groove on the left side, and multiple wear switches 31 are installed in the annular groove. The moving ring 5 has an annular protrusion on the right side, and the annular protrusion cooperates with the annular groove. When the friction plate 4 is not worn, the distance between the annular protrusion and the wear switch 31 is half the thickness of the friction plate 4. The wear switch 31 is electrically connected to an external alarm.

[0058] When the cartridge mechanical seal equipment is working normally, the friction plate 4 and the passive ring 5 are in contact and rotate to squeeze the moving ring 5. The thickness of the friction plate 4 becomes thinner due to uniform wear. When the thickness of the friction plate 4 is worn down to half of its original thickness, the annular protrusion on the right side of the moving ring 5 will contact the wear switch 31 in the annular groove on the left side of the fixed ring 3. The wear switch 31 connects to the external alarm and sends a signal that the service life of the friction plate 4 is about to end, reminding the user to prepare to replace the friction plate 4.

[0059] As one embodiment of the present invention, refer to Figure 2 and Figure 4 The part of the moving ring 5 that contacts the main spring 6 is a groove, and the right side of the main spring 6 is fitted inside the groove.

[0060] Under normal operation of the mechanical seal equipment, the spring seat 7 and the main spring 6 rotate with the shaft 1. When the main spring 6 rotates with the shaft 1, it moves up and down slightly under the action of centrifugal force, resulting in uneven thrust of the main spring 6 on the fixed ring 3. Uneven thrust on the fixed ring 3 will accelerate the wear of the friction plate 4. The groove set on the fixed ring 3 can limit the up and down movement of the right end of the main spring 6, so that the thrust of the main spring 6 on the fixed ring 3 remains uniform and stable, reducing the wear of the friction plate 4 and extending the service life of the friction plate 4.

[0061] As one embodiment of the present invention, refer to Figure 2 and Figure 4 The main spring 6 is a rectangular helical spring.

[0062] Compared to ordinary circular helical springs, rectangular helical springs have a characteristic curve that is closer to a straight line, and their stiffness is closer to a fixed constant. The entire system has better coaxial stability and can distribute the pressure of the main spring more evenly, thus improving the reliability of the entire system.

[0063] Working principle: This invention uses an adjustable clamping device to adjust the pressure of the rotating ring on the friction plate to adapt to different external pressure environments. When the external pressure increases, the pressure of the rotating ring on the friction plate is increased to ensure the sealing effect. When the external pressure decreases, the pressure of the rotating ring on the friction plate is decreased to reduce the wear and heat of the friction plate and extend its service life.

[0064] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power via transformers. The main controller can be a conventional known device such as a computer for control. The product models provided in this invention are only for use based on the structural features of the product in this technical solution. The product will be adjusted and modified after purchase to better match and conform to the technical solution of this invention. It is an optimal application of this technical solution. The product models can be replaced and modified according to the required technical parameters. This is well known to those skilled in the art. Therefore, those skilled in the art can clearly obtain the corresponding usage effects through the technical solution provided by this invention.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cartridge-type mechanical seal device, comprising: The outer casing (2) has a shaft (1) horizontally mounted on its cylindrical axis, penetrating the left and right side walls of the casing (2). Multiple mounting holes (21) are provided on the right flange wall of the outer casing (2). A fixed ring is mounted on the right side wall inside the outer casing (2). The fixed ring and shaft (1) are concentrically fitted together. A friction plate (4) is mounted on the left side of the fixed ring. A movable ring (5) is movably fitted onto the shaft (1). The right side of the movable ring (5) engages with the friction plate (4). 5) A groove is provided on the shaft (1), and a sealing ring (51) is installed in the groove. The sealing ring (51) and the shaft (1) cooperate with each other. A spring seat (7) is provided on the shaft (1). A main spring (6) is provided on the right side of the spring seat (7). The other end of the main spring (6) is provided on the moving ring (5). The feature is that it also includes: an adjustable clamping device. An adjustable clamping device is also provided on the outer shell (2). The adjustable clamping device is used to adjust the pressure of the moving ring (5) on the friction plate (4). The adjustable clamping device includes an adjusting ring (8), which is installed on the left side wall of the outer shell (2). The adjusting ring (8) and the outer shell (2) are threadedly connected, and the adjusting ring (8) cooperates with the spring seat (7).

2. The cartridge-type mechanical seal device according to claim 1, characterized in that: The right end of the adjusting ring (8) is equipped with a thrust ball bearing (81), and the right end of the thrust ball bearing (81) cooperates with the spring seat (7).

3. The cartridge-type mechanical seal device according to claim 1, characterized in that: Multiple radial ball bearings (82) are installed on the adjusting ring (8). The outer ring of the radial ball bearing (82) is engaged with the adjusting ring (8), and the inner ring of the radial ball bearing (82) is engaged with the shaft (1).

4. A cartridge-type mechanical seal device according to claim 1, characterized in that: The adjusting ring (8) is fitted with a locking nut (83), which is located on the left outer wall of the outer shell (2).

5. A cartridge-type mechanical seal device according to claim 1, characterized in that: The adjusting ring (8) is equipped with a ring pointer (84), and a scale is fixedly installed on the left side wall of the outer casing (2).

6. A cartridge-type mechanical seal device according to claim 1, characterized in that: Two adjustment handles (85) are installed on the left side of the adjustment ring (8).

7. A cartridge-type mechanical seal device according to claim 1, characterized in that: The fixed ring has an annular groove on the left side, and multiple wear switches (31) are installed in the annular groove. The moving ring (5) has an annular protrusion on the right side, and the annular protrusion cooperates with the annular groove. When the friction plate (4) is not worn, the distance between the annular protrusion and the wear switch (31) is half the thickness of the friction plate (4). The wear switch (31) is electrically connected to the external alarm.

8. A cartridge-type mechanical seal device according to claim 1, characterized in that: The contact portion between the moving ring (5) and the main spring (6) is a groove, and the right side of the main spring (6) is fitted inside the groove.

9. A cartridge-type mechanical seal device according to claim 1, characterized in that: The main spring (6) is a rectangular helical spring.

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