Packing sealing structure for slurry pump and slurry pump

Abstract

The utility model provides a filler sealing structure for a slurry pump and the slurry pump. The filler sealing structure comprises a shaft sleeve, a packing, a sealing ring and a gland. The shaft sleeve is used for fixedly sleeving a shaft; the shaft sleeve and the shaft hole of the stuffing box form an annular cavity with one end open. The number of the packings is multiple, and all the packings are arranged in the annular cavity. The number of the sealing rings is multiple, and the sealing rings are arranged in the annular cavity. The shaft sleeve is sleeved with the gland, and the gland is used for blocking the opening of the annular cavity and limiting the packings and the sealing rings in the axis direction of the shaft sleeve. According to the packing sealing structure for the slurry pump and the packing sealing mode adopted by the slurry pump, the sealing effect can be effectively enhanced, meanwhile, due to the arrangement of the multiple sealing rings, abrasion to the shaft sleeve can be relatively reduced, the service life of the pump is prolonged, and practicability is high.

Description

Technical Field

[0001] This utility model belongs to the field of slurry pump technology, specifically relating to a packing seal structure for a slurry pump and a slurry pump. Background Technology

[0002] Packing seal is a common sealing method for slurry pumps. The conventional design of this method involves setting a bushing, packing, etc. between the shaft and the stuffing box (with stepped shaft holes) to form a packing seal, which prevents the liquid inside the pump from leaking out.

[0003] In existing technologies, asbestos packing is the most widely used packing material for sealing. It has advantages such as good heat resistance and high strength. However, its surface is rough, its coefficient of friction is high, and it hardens after a period of use, which affects the sealing effect. Moreover, in practical applications, with the extension of service time, the leakage at the packing seal will continue to increase, and the shaft sleeve will also wear, seriously affecting the service life of the pump. Utility Model Content

[0004] This utility model provides a packing seal structure for a slurry pump and a slurry pump, aiming to solve the problem of poor practicality of existing slurry pumps caused by the deterioration of the sealing effect of the packing seal after long-term use.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A packing seal structure for a slurry pump is provided, comprising:

[0007] A bushing is used to fix it on the shaft; the bushing and the shaft hole of the stuffing box form an annular cavity with one end open;

[0008] Packing glands are provided in multiple locations, and each packing gland is disposed in the annular cavity;

[0009] Multiple sealing rings are provided, and each sealing ring is disposed in the annular cavity;

[0010] A pressure cap, fitted onto the bushing, is used to seal the opening of the annular cavity and to limit the position of each packing and each sealing ring in the axial direction of the bushing.

[0011] In one possible implementation, the outer wall surface of the bushing is coated with a ceramic wear-resistant layer.

[0012] In one possible implementation, the packing glands are arranged sequentially and positioned at the end of the annular cavity near the opening.

[0013] In one possible implementation, the sealing rings are arranged sequentially and disposed at the end of the annular cavity away from the opening;

[0014] The packing and the sealing ring are arranged adjacent to each other and abut against each other.

[0015] In one possible implementation, the sealing ring is a K-type sealing ring.

[0016] In one possible implementation, the gland has an annular compression portion that is coaxially arranged with the bushing and can extend into the annular cavity.

[0017] In one possible implementation, the gland is bolted to the stuffing box.

[0018] This utility model also provides a slurry pump, including the above-mentioned packing seal structure for slurry pumps.

[0019] The packing seal structure for slurry pumps provided in this implementation, compared with existing technologies, addresses the issue that during pump operation, the shaft and bushing, as rotating components, rotate relative to the packing rings and seals. The bushing reduces shaft wear. The combination of multiple packing rings and seals, acting as packing, significantly improves sealing performance through the synergistic effect of multiple and multi-stage sealing mechanisms. The additional gland seals the opening of the annular cavity and limits the movement of the packing rings and seals. After gland installation, axial limiting causes the packing to expand, achieving self-adaptive sealing, while the seals achieve initial sealing force through their elastic deformation. This packing seal effectively enhances the sealing effect, and the use of multiple seals also reduces wear on the bushing, extending pump lifespan and demonstrating strong practicality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the packing seal structure for a slurry pump provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the shaft sleeve in the packing seal structure for a slurry pump provided in this embodiment of the utility model;

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Shaft sleeve; 11. Ceramic wear-resistant layer; 20. Packing; 30. Sealing ring; 40. Gland; 50. Stuffing box; 60. Shaft; 70. Water seal ring; 80. Inlet channel; 90. Secondary impeller. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Please refer to the following: Figure 1 The packing seal structure for a slurry pump provided by this utility model will now be described. The packing seal structure for a slurry pump includes a shaft sleeve 10, packing rings 20, sealing rings 30, and a gland 40. The shaft sleeve 10 is fixedly fitted onto a shaft 60. The shaft sleeve 10 and the shaft hole of the stuffing box 50 form an annular cavity with one end open. Multiple packing rings 20 are provided, each disposed within the annular cavity. Multiple sealing rings 30 are provided, each disposed within the annular cavity. The gland 40 is fitted onto the shaft sleeve 10, used to seal the opening of the annular cavity, and to limit the movement of each packing ring 20 and each sealing ring 30 along the axial direction of the shaft sleeve 10.

[0026] The packing seal structure for the slurry pump provided in this embodiment, compared with the prior art, features a rotating shaft 60 and shaft sleeve 10 that rotate relative to the packing rings 20 and sealing rings 30 during pump operation. The installation of the shaft sleeve 10 reduces wear on the shaft 60. The combination of multiple packing rings 20 and sealing rings 30, acting as packing, significantly improves sealing performance through the synergistic effect of multiple and multi-stage sealing mechanisms. The additional gland 40 seals the opening of the annular cavity and limits the movement of the packing rings 20 and sealing rings 30. After the gland 40 is installed, the axial limiting causes the packing rings 20 to expand, achieving self-adaptive sealing, while the sealing rings 30 achieve initial sealing force through their own elastic deformation. This packing seal effectively enhances the sealing effect, and the multiple sealing rings 30 also relatively reduce wear on the shaft sleeve 10, extending the pump's service life and demonstrating strong practicality.

[0027] For ease of understanding, the top of the bushing 10, away from the opening of the annular cavity, contacts the auxiliary impeller 90. The auxiliary impeller 90 is coaxially and fixedly connected to the shaft 60, and the auxiliary impeller 90 is located in the pump. Of course, the annular cavity can also be formed in the shaft hole of the stuffing box 50 together with the auxiliary impeller 90 and the bushing 10.

[0028] In some embodiments, the bushing 10 may be adopted as follows: Figures 1 to 2 The structure shown. See also Figures 1 to 2 The outer wall of the bushing 10 is coated with a ceramic wear-resistant layer 11.

[0029] The ceramic wear-resistant layer 11 sprayed on the outer wall of the bushing 10 can significantly improve the performance of the friction pair, thereby effectively avoiding the wear of the packing 20 and the sealing ring 30 on the bushing 10, and further extending the service life of the bushing 10.

[0030] In this embodiment, the base material of the bushing 10 can be tempered 45 steel, and the ceramic coating can be a sprayed tungsten carbide coating with a porosity of <1%, which is suitable for corrosive and wear conditions. The length of the ceramic wear-resistant layer 11 sprayed in the axial direction of the bushing 10 needs to be greater than the length of each packing 20 and each sealing ring 30 assembly, so as to ensure that when relative rotation occurs, it occurs on the surface of the wear-resistant ceramic coating.

[0031] It should be noted that, to facilitate the transportation and transfer of the bushing 10, some metal is left at both ends of the bushing 10. This design effectively prevents the ceramic wear-resistant coating from being damaged during transportation and installation. The ceramic wear-resistant coating has a surface hardness of up to HV1000, exhibiting high hardness and excellent wear resistance. Furthermore, it possesses self-lubricating properties, maintaining a stable coefficient of friction (0.12-0.18) even under dry friction conditions, effectively reducing the coefficient of friction between the two components, minimizing wear, and extending service life.

[0032] In some embodiments, the packing 20 described above may employ, for example... Figure 1 The structure shown. See also Figure 1 Each packing 20 is arranged in sequence and is located at the end of the annular cavity near the opening.

[0033] As a traditional sealing element, the packing 20 is made of flexible material woven or molded. The packing 20 is set near the opening of the annular cavity, which can withstand differential pressure load. At the same time, the arrangement of multiple packing 20 can increase the contact area with the bushing 10, so as to make the contact stress distribution more uniform.

[0034] In some embodiments, the sealing ring 30 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 Each sealing ring 30 is arranged in sequence and is located at the end of the annular cavity away from the opening.

[0035] The packing 20 and sealing ring 30 are arranged adjacently and abut against each other.

[0036] In this embodiment, each sealing ring 30 is located inside each packing 20. The shaft hole on the stuffing box 50 needs further explanation. This shaft hole is a stepped hole, and the stepped hole and the bushing 10 form an annular cavity with one end open. The other end of the annular cavity forms an annular surface, and each sealing ring 30 is positioned near the annular surface of the shaft hole. The sealing ring 30 being located inside each packing 20 satisfies the mechanical logic chain of the structural layout. After the packing 20 is limited and compressed by the gland 40, the pressure distribution along the axial direction of the bushing 10 follows a gradient attenuation law. The sealing ring 30, located at the inner end of the annular cavity, avoids being subjected to excessive axial pressure, thereby preventing failure due to high pressure.

[0037] For the two embodiments described above, the packing method can also be adjusted for different working conditions, for example:

[0038] 1. In the regrinding process, the open end of the annular cavity is equipped with oil-impregnated asbestos packing 20, and the other end is equipped with fluororubber sealing ring 30. The number of packing 20 and sealing ring 30 can be the same, for example, two of each.

[0039] 2. In heavy wear and corrosion conditions, the open end of the annular cavity is fitted with a polytetrafluoroethylene packing 20, and the other end is fitted with a fluororubber sealing ring 30. The number of packing 20 and sealing ring 30 can be the same, for example, two of each.

[0040] 3. In heavily corrosive conditions, PTFE packing 20 is used at the open end of the annular cavity, and PTFE sealing ring 30 is used at the other end. The number of packing 20 and sealing ring 30 can be the same, for example, two of each.

[0041] Of course, the number of packing rings 20 and sealing rings 30 can also be adjusted randomly.

[0042] In some embodiments, the sealing ring 30 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 The sealing ring 30 is a K-type sealing ring.

[0043] In this embodiment, the inner diameter of the K-type sealing ring 30 is smaller than the outer diameter of the bushing 10, the outer diameter of the K-type sealing ring 30 is larger than the inner diameter of the shaft hole of the stuffing box 50, and the opening of the K-type sealing ring 30 is set far away from the packing 20. This can effectively prevent the slurry from passing through and improve the sealing performance.

[0044] The K-type seal ring 30, as a dynamic sealing element, boasts excellent dynamic sealing performance and can adaptively compensate for radial runout. As an elastomer material, the K-type seal ring 30 features a hydrodynamic pressure-enhanced lip design typically with an angle (5°-15°). When pressure increases on one side of the lip, it can deform to provide a better seal. Simultaneously, the elastic material can absorb the vibration energy of the shaft 60, reducing the risk of resonance in the sealing system.

[0045] In some embodiments, the aforementioned gland 40 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 The pressure cap 40 has an annular extrusion portion that is coaxially arranged with the bushing 10 and can extend into the annular cavity.

[0046] The gland 40 can ensure the sealing of the annular cavity, and the gland 40 can be rotatably connected to the bushing 10. The gland 40 is provided with an annular extrusion part, which can be a ring body adapted to the annular cavity. The ring body can extend into the annular cavity, thereby extruding the packing in the axial direction of the bushing 10 to ensure stability and sealing effect.

[0047] It should be noted that the ceramic wear-resistant layer 11 on the bushing 10 can extend to the gland 40 to reduce the wear of the gland 40 on the bushing 10 and improve its service life.

[0048] In some embodiments, the aforementioned gland 40 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 The gland 40 is bolted to the stuffing box 50. This connection structure facilitates disassembly and assembly, ensures connection strength, and allows the gland 40 to adjust the extrusion pressure on the packing.

[0049] In some embodiments, the aforementioned gland 40 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 The packing seal structure for slurry pumps may also include a water seal component, which includes a water seal ring 70 located at the end of the annular cavity away from the opening, and a sealing ring 30 placed between the water seal ring 70 and each packing 20.

[0050] The packing box 50 is provided with a water inlet channel 80 that communicates with the innermost part of the annular cavity. The water inlet of the water inlet channel 80 is provided with a pipe joint. Water can be injected into the water seal ring 70 to achieve a water seal and further ensure the sealing effect.

[0051] Of course, as a feasible implementation method of this embodiment, a water outlet channel can also be provided on the stuffing box 50 so that water can be discharged after passing through the water seal ring 70. This method can also carry heat out, thereby achieving a cooling effect.

[0052] Based on the same inventive concept, this application also provides a slurry pump, including the above-described packing seal structure for a slurry pump.

[0053] Compared with the prior art, the slurry pump provided in this embodiment can effectively enhance the sealing effect through the slurry pump packing seal structure. At the same time, the setting of multiple sealing rings 30 can also relatively reduce the wear on the shaft sleeve 10 and extend the service life, making it highly practical.

[0054] 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 and improvements 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 packing seal structure for a slurry pump, characterized by, The application relates to a packing seal structure of a slurry pump, which comprises the following parts: a shaft sleeve for being sleeved on a shaft; the shaft sleeve and a shaft hole of a packing box form an annular cavity with one end being open; a plurality of packing rings are arranged in the annular cavity; a plurality of sealing rings are arranged in the annular cavity; a gland is sleeved on the shaft sleeve and is used for sealing the open end of the annular cavity and limiting the packing rings and the sealing rings in the axial direction of the shaft sleeve.

2. The packing box structure for a slurry pump according to claim 1, wherein The outer wall surface of the shaft sleeve is sprayed with a ceramic wear-resistant layer.

3. A packing box for a slurry pump according to any one of claims 1-2, characterized in that The packing rings are arranged in sequence and are arranged at one end of the annular cavity close to the open end.

4. The packing box for a slurry pump as set forth in claim 3, wherein The sealing rings are arranged in sequence and are arranged at one end of the annular cavity away from the open end. The packing rings and the sealing rings arranged in sequence abut against each other.

5. The packing box structure for a slurry pump according to any one of claims 1 to 2, wherein The sealing ring is a K-shaped sealing ring.

6. The packing box for a slurry pump as set forth in any one of claims 1 to 2, characterized by The gland has an annular extrusion part coaxially arranged with the shaft sleeve and capable of extending into the annular cavity.

7. The packing box for a slurry pump as set forth in claim 6, wherein The gland is bolt-connected with the packing box.

8. A slurry pump characterised in that, The application further discloses a slurry pump with the packing seal structure.

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