Mechanical seal device for slurry pump resistant to dry grinding

Abstract

The utility model relates to mechanical seal technical field, and disclose the mechanical seal device for resisting dry grinding's slurry pump, including static ring and dynamic ring, dynamic ring rotatory installation is in static ring surface, and static ring can be connected with slurry pump pump shell fixedly, still include first sealing ring, second sealing ring and expansion assembly, first sealing ring and second sealing ring are all elastic members, first sealing ring installs in static ring, second sealing ring installs in dynamic ring, and second sealing ring and static ring end face are close, expansion assembly and first sealing ring and second sealing ring contact, and through expansion assembly extrusion first sealing ring and second sealing ring elastic deformation. The utility model, whole mechanical seal mainly relies on expansion assembly to first sealing ring and second sealing ring and extrudes, makes its elastic deformation, relatively, pressure is more stable, can effectively avoid the sealing performance deterioration caused by spring elastic deformation, and the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and more specifically to a mechanical seal device for slurry pumps that is resistant to dry grinding. Background Technology

[0002] Mechanical seals are devices used to prevent fluid leakage and are widely used in various industrial equipment.

[0003] Currently, conventional mechanical seals mainly achieve sealing through the tight fit of a rotating ring and a stationary ring. The rotating ring is mounted on a rotating shaft and rotates with the shaft; the stationary ring is fixed to a stationary part of the equipment. The contact surfaces of these two rings are tightly fitted together under the action of a spring or fluid pressure to form a sealing surface. When the equipment is running, the fluid is obstructed at the sealing surface, thereby preventing leakage.

[0004] The mechanical seal described above mainly relies on springs to provide static pressure to the rotating and stationary rings to achieve sealing during operation. In this structure, the springs will fatigue and undergo elastic deformation due to vibration, which will cause changes in the sealing pressure and thus lead to a deterioration in the sealing effect. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a mechanical seal device for slurry pumps that is resistant to dry grinding, so as to solve the problem that the existing mechanical seals mainly provide sealing pre-tightening force through springs, resulting in unstable sealing effect.

[0006] This utility model provides the following technical solution: a mechanical seal device for a slurry pump with anti-dry grinding, including a stationary ring and a rotating ring. The rotating ring is rotatably mounted on the surface of the stationary ring, and the stationary ring can be fixedly connected to the pump casing of the slurry pump. It also includes a first sealing ring, a second sealing ring, and an expansion assembly. The first sealing ring and the second sealing ring are both elastic elements. The first sealing ring is installed inside the stationary ring, and the second sealing ring is installed inside the rotating ring. The second sealing ring is in close contact with the end face of the stationary ring. The expansion assembly contacts the first sealing ring and the second sealing ring, and the expansion assembly compresses the first sealing ring and the second sealing ring to elastically deform.

[0007] Furthermore, the tightening assembly includes a first compression ring, which is installed inside the stationary ring and close to the pump casing of the slurry pump, while the first compression ring is in contact with the side of the first sealing ring.

[0008] Furthermore, the tightening assembly also includes a second compression ring, which is installed inside the rotating ring and contacts the side of the second sealing ring away from the stationary ring.

[0009] Furthermore, the tensioning assembly also includes a compression spring, which is installed between the second compression ring and the inner wall of the moving ring, and the second compression ring remains tightly attached to the second sealing ring under the action of the compression spring.

[0010] Furthermore, through holes are provided in the middle of the stationary ring, the rotating ring, the first sealing ring, and the second sealing ring, and all through holes are coaxial. At the same time, the shaft of the slurry pump can be tightly rotated through the middle of the through holes.

[0011] Furthermore, the tensioning assembly also includes a tensioning ring and a tensioning block. The tensioning ring is installed inside the rotating ring and is fixedly connected to the second compression ring. A tapered groove is provided on the side of the tensioning ring away from the second compression ring. The tensioning block is slidably installed inside the rotating ring and can rotate synchronously with the rotating ring. The tensioning block contacts the tapered groove of the tensioning ring, and the tensioning block can slide under the action of centrifugal force generated when rotating with the rotating ring. At the same time, when the tensioning block slides, it can push the tensioning ring to squeeze the second compression ring.

[0012] Furthermore, the surface of the expansion block that contacts the conical groove is a conical surface with a consistent taper.

[0013] Furthermore, a guide groove is fixedly installed on the inner side of the moving ring, and the tensioning block is slidably installed in the guide groove. The tensioning block can slide in the guide groove along the diameter direction of the moving ring. At the same time, when the tensioning block moves away from the axis of the moving ring, it can push the tensioning ring to squeeze the second compression ring.

[0014] Furthermore, a flange is installed on the side of the stationary ring near the mud pump, and a locking bolt is threaded through the surface of the rotating ring. The rotating shaft of the mud pump passes through the middle of the rotating ring 2. The rotating ring and the rotating shaft of the mud pump can be fixed by tightening the locking bolt.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. In this utility model, the entire mechanical seal mainly relies on the expansion assembly to compress the first and second sealing rings, causing them to elastically deform. This allows the inner and outer rings of the first and second sealing rings to press against the inner walls of the mud pump shaft and the stationary and rotating rings, respectively, to achieve a stable seal. The expansion force of the expansion assembly mainly comes from the pressure of the liquid inside the mud pump and the centrifugal force generated by the rotation of the mud pump shaft. Relatively speaking, the pressure is more stable, which can effectively avoid the deterioration of sealing performance caused by the elastic deformation of the spring, resulting in a better sealing effect.

[0017] 2. In the process of use, the pressure of the expansion assembly on the first and second sealing rings is mainly achieved by the liquid pressure inside the mud pump and the centrifugal force generated by the rotating ring as the mud pump shaft rotates. Therefore, the sealing effect can be better and better within the bearing pressure extreme values ​​of the first and second sealing rings as the liquid pressure inside the mud pump increases and the speed of the mud pump increases. Thus, the higher the pressure and the higher the speed, the better the sealing effect. Attached Figure Description

[0018] Figure 1This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a first-view schematic diagram of the internal structure of this utility model;

[0020] Figure 3 This is a second-view schematic diagram of the internal structure of this utility model.

[0021] The attached diagram is labeled as follows: 1. Stationary ring; 2. Moving ring; 3. First sealing ring; 4. Second sealing ring; 5. First compression ring; 6. Second compression ring; 7. Compression spring; 8. Tensioning ring; 9. Tensioning block; 10. Guide groove. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The mechanical seal device for anti-dry grinding slurry pumps involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Reference Figure 1-3 This utility model provides a mechanical seal device for a slurry pump that is resistant to dry grinding, including a stationary ring 1 and a rotating ring 2. The rotating ring 2 is rotatably mounted on the surface of the stationary ring 1, and the stationary ring 1 can be fixedly connected to the pump casing of the slurry pump. It also includes a first sealing ring 3, a second sealing ring 4, and an expansion assembly. The first sealing ring 3 and the second sealing ring 4 are both elastic elements. The first sealing ring 3 is installed inside the stationary ring 1, and the second sealing ring 4 is installed inside the rotating ring 2, with the second sealing ring 4 tightly attached to the end face of the stationary ring 1. The expansion assembly contacts the first sealing ring 3 and the second sealing ring 4, and the expansion assembly compresses the first sealing ring 3 and the second sealing ring 4 to elastically deform.

[0024] The expansion assembly includes a first compression ring 5, which is installed inside the stationary ring 1 and close to the pump casing of the slurry pump. The first compression ring 5 is in contact with the side of the first sealing ring 3. The expansion assembly also includes a second compression ring 6, which is installed inside the moving ring 2 and is in contact with the side of the second sealing ring 4 away from the stationary ring 1. The expansion assembly also includes a compression spring 7, which is installed between the second compression ring 6 and the inner wall of the moving ring 2. Under the action of the compression spring 7, the second compression ring 6 is kept in close contact with the second sealing ring 4.

[0025] The stationary ring 1, the rotating ring 2, the first sealing ring 3, and the second sealing ring 4 are all provided with through holes in the middle, and all the through holes are coaxial. At the same time, the shaft of the slurry pump can be tightly rotated through the middle of the through holes.

[0026] Thus, simply pass the shaft of the mud pump through the middle of the stationary ring 1 and the moving ring 2, and fix the stationary ring 1 to the pump cover of the mud pump. Then, during the operation of the mud pump, the liquid inside the mud pump will first flow into the stationary ring 1, and then push the first compression ring 5 to move. The movement of the first compression ring 5 will compress and deform the first sealing ring 3, so that the inner ring of the first sealing ring 3 presses against the mud pump shaft, and the outer ring presses against the inner wall of the stationary ring 1, thus achieving the first seal. Moreover, the sealing performance increases with the increase of the pressure inside the mud pump. If the liquid inside the mud pump leaks through the stationary ring 1, it will enter the moving ring 2. Inside the moving ring 2, the second compression ring 6 will compress and deform the second sealing ring 4 under the action of the compression spring 7, so that the inner ring of the second sealing ring 4 presses against the mud pump shaft, and the outer ring presses against the inner wall of the moving ring 2, thus achieving the second seal.

[0027] The tensioning assembly also includes a tensioning ring 8 and a tensioning block 9. The tensioning ring 8 is installed inside the rotating ring 2 and is fixedly connected to the second compression ring 6. A tapered groove is formed on the side of the tensioning ring 8 away from the second compression ring 6. The tensioning block 9 is slidably installed inside the rotating ring 2 and can rotate synchronously with the rotating ring 2. The tensioning block 9 contacts the tapered groove of the tensioning ring 8, and the tensioning block 9 can slide under the centrifugal force generated when it rotates with the rotating ring 2. At the same time, when the tensioning block 9 slides, it can push the tensioning ring 8 to squeeze the second compression ring 6. The surface of the tensioning block 9 that contacts the tapered groove is tapered. The rotating ring 2 has a uniform taper and a guide groove 10 fixedly installed on its inner side. The expansion block 9 is slidably installed in the guide groove 10 and can slide along the diameter of the rotating ring 2 in the guide groove 10. At the same time, when the expansion block 9 moves away from the axis of the rotating ring 2, it can push the expansion ring 8 to squeeze the second compression ring 6. The stationary ring 1 has a flange installed on its side near the mud pump. The rotating ring 2 has a threaded locking bolt, and the rotating shaft of the mud pump passes through the middle of the rotating ring 2. The rotating ring 2 and the rotating shaft of the mud pump can be fixed by tightening the locking bolt.

[0028] Thus, simply tightening the locking bolts fixes the rotating ring 2 to the mud pump shaft. The rotating ring 2 will then rotate synchronously with the mud pump shaft. Under centrifugal force, the internal expansion block 9 will slide along the diameter of the rotating ring 2, thereby pushing the expansion ring 8 to compress the second compression ring 6. This further enhances the pressure of the second compression ring 6 on the second sealing ring 4, strengthening the second seal.

[0029] Therefore, the complete usage process is as follows: First, the shaft of the mud pump is passed through the middle of the stationary ring 1 and the moving ring 2, and the stationary ring 1 is fixed to the pump cover of the mud pump. Then, the locking bolts are tightened to fix the moving ring 2 to the shaft of the mud pump. After that, during the operation of the mud pump, the liquid in the mud pump will first flow into the stationary ring 1, and then push the first extrusion ring 5 to move. The movement of the first extrusion ring 5 will compress the first sealing ring 3, thereby causing the inner ring of the first sealing ring 3 to press against the shaft of the mud pump and the outer ring to press against the inner wall of the stationary ring 1, thus achieving the first seal. Moreover, the sealing performance increases with the increase of the pressure in the mud pump.

[0030] If the liquid inside the mud pump leaks through the stationary ring 1, it will enter the rotating ring 2. Inside the rotating ring 2, the second compression ring 6 will deform the second sealing ring 4 under the action of the compression spring 7. This causes the inner ring of the second sealing ring 4 to press against the mud pump shaft, and the outer ring to press against the inner wall of the rotating ring 2, thus achieving a second seal. Furthermore, the rotating ring 2 will rotate synchronously with the mud pump shaft. As a result, the internal expansion block 9 will slide along the diameter of the rotating ring 2 under the action of centrifugal force, thereby pushing the expansion ring 8 to move and compress the second compression ring 6, further increasing the pressure of the second compression ring 6 on the second sealing ring 4, thus strengthening the second seal.

[0031] In summary, the entire mechanical seal mainly relies on the expansion assembly to compress the first sealing ring 3 and the second sealing ring 4, causing them to deform elastically. This allows the inner and outer rings of the first sealing ring 3 and the second sealing ring 4 to press against the inner walls of the mud pump shaft and the stationary ring 1 and the rotating ring 2, respectively, to achieve a stable seal. The expansion force of the expansion assembly mainly comes from the pressure of the liquid inside the mud pump and the centrifugal force generated by the rotation of the mud pump shaft. Relatively speaking, the pressure is more stable, which can effectively avoid the deterioration of sealing performance caused by the elastic deformation of the spring, resulting in a better sealing effect.

[0032] Meanwhile, during use, since the pressure of the expansion assembly on the first sealing ring 3 and the second sealing ring 4 is mainly achieved by the liquid pressure inside the mud pump and the centrifugal force generated by the rotating ring 2 as it rotates with the mud pump shaft, its sealing effect can become better and better as the liquid pressure inside the mud pump increases and the speed of the mud pump increases, thus achieving the effect of better sealing effect with higher pressure and higher speed.

[0033] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical seal device for a slurry pump with anti-dry grinding, comprising a stationary ring (1) and a rotating ring (2), wherein the rotating ring (2) is rotatably mounted on the surface of the stationary ring (1), and the stationary ring (1) can be fixedly connected to the pump casing of the slurry pump, characterized in that: It also includes a first sealing ring (3), a second sealing ring (4), and a tightening assembly. The first sealing ring (3) and the second sealing ring (4) are both elastic elements. The first sealing ring (3) is installed inside the stationary ring (1) and is tightly attached to the inner wall of the stationary ring (1). The second sealing ring (4) is installed inside the rotating ring (2) and is tightly attached to the end face of the stationary ring (1). The tightening assembly contacts the first sealing ring (3) and the second sealing ring (4) and, by squeezing the first sealing ring (3) and the second sealing ring (4) to elastically deform, it abuts against the slurry pump shaft and the inner walls of the stationary ring (1) and the rotating ring (2).

2. The mechanical seal device for a slurry pump with anti-dry grinding as described in claim 1, characterized in that: The expansion assembly includes a first compression ring (5), which is installed inside the stationary ring (1) and close to the pump casing of the slurry pump. At the same time, the first compression ring (5) is in contact with the side of the first sealing ring (3).

3. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 2, characterized in that: The expansion assembly also includes a second compression ring (6), which is installed inside the moving ring (2) and contacts the side of the second sealing ring (4) away from the stationary ring (1).

4. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 3, characterized in that: The expansion assembly also includes a compression spring (7), which is installed between the second compression ring (6) and the inner wall of the moving ring (2), and the second compression ring (6) is kept in close contact with the second sealing ring (4) under the action of the compression spring (7).

5. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 3 or 4, characterized in that: The stationary ring (1), the moving ring (2), the first sealing ring (3), and the second sealing ring (4) are all provided with through holes in the middle, and all through holes are coaxial. At the same time, the shaft of the slurry pump can be tightly rotated through the middle of the through holes.

6. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 5, characterized in that: The expansion assembly also includes an expansion ring (8) and an expansion block (9). The expansion ring (8) is installed inside the moving ring (2) and is fixedly connected to the second compression ring (6). A tapered groove is provided on the side of the expansion ring (8) away from the second compression ring (6). The expansion block (9) is slidably installed inside the moving ring (2) and can rotate synchronously with the moving ring (2). The expansion block (9) contacts the tapered groove of the expansion ring (8) and can slide under the centrifugal force generated when the moving ring (2) rotates. At the same time, the expansion block (9) can push the expansion ring (8) to squeeze the second compression ring (6) when sliding.

7. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 6, characterized in that: The surface of the expansion block (9) that contacts the conical groove is a conical surface with a consistent taper.

8. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 7, characterized in that: The inner side of the moving ring (2) is fixedly installed with a guide groove (10), and the expansion block (9) is slidably installed in the guide groove (10). The expansion block (9) can slide in the guide groove (10) along the diameter direction of the moving ring (2). At the same time, when the expansion block (9) moves away from the axis of the moving ring (2), it can push the expansion ring (8) to squeeze the second compression ring (6).

9. The mechanical seal device for a slurry pump with anti-dry grinding according to claim 1, characterized in that: The stationary ring (1) is fitted with a flange on the side near the mud pump. The surface of the rotating ring (2) is threaded with locking bolts, and the rotating shaft of the mud pump passes through the middle of the rotating ring (2). The rotating ring (2) and the rotating shaft of the mud pump can be fixed by tightening the locking bolts.

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