A shaft seal apparatus for a fluid transfer pump having enhanced sealing performance

Abstract

The utility model relates to the technical field of shaft seal, disclose a kind of shaft seal device of sealing performance enhancement of fluid delivery pump, including fluid pump, the top end of the fluid pump is fixedly connected with cavity, the inside of the top end of the fluid pump is provided with transmission shaft, the inside of the cavity is detachably connected with assembly jacket, the inside of the assembly jacket is fixedly connected with reference ring one, the inside of the assembly jacket is fixedly connected with reference ring two, the inside of the assembly jacket is detachably connected with oil seal one, the inside of the assembly jacket is detachably connected with oil seal two, the outside top end of the assembly jacket is threadedly connected with top cover. In the utility model, it is combined that double oil seal structure and bellows dust cover can effectively reduce the risk of fluid leakage, at the same time, bellows dust cover deforms elastically with the movement of shaft, compensates the displacement and bounce of shaft, prevents dust from entering.

Description

Technical Field

[0001] This utility model relates to the field of shaft sealing technology, and in particular to a shaft sealing device for enhancing the sealing performance of a fluid transfer pump. Background Technology

[0002] Fluid transfer pumps are typically designed with an impeller connected to one end of a pump shaft and a motor connected to the other end via a coupling. Bearings are also installed on the pump shaft to support the rotating components. When the impeller rotates, it increases the kinetic and static pressure energy of the liquid, thereby using the resulting pressure difference to draw the liquid in, pressurize it, and then discharge it from the pump body.

[0003] Because there is a gap between the pump shafts, a shaft seal is needed to seal the gap between the pump shafts to prevent the liquid inside the pump from flowing out.

[0004] Existing pump shafts suffer from inadequate sealing due to the simple sealing structure of the motor drive shaft during installation. This leads to insufficient seal strength, making internal oil leakage easy and allowing water to enter the pump shaft area, potentially causing electric shock. Secondly, the dust cover in the traditional shaft seal area interferes with surrounding components during normal operation of the fluid transfer pump, especially when it reaches its extreme oscillation. This continuous collision and friction not only causes the dust cover to shift or break but also allows impurities such as mud and sand to enter the pump shaft area through the damaged area. Furthermore, dust particles can scratch the sealing surface, increasing resistance during shaft rotation. Therefore, to address these issues, a shaft seal device with enhanced sealing performance for fluid transfer pumps is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a shaft seal device with enhanced sealing performance for fluid transfer pumps, aiming to improve the problems in the prior art where the shaft seal is not firm and easily leaks oil, and the dust cover is easily deformed and damaged by the rotating shaft, causing dust to enter the pump shaft area.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A shaft sealing device for enhancing the sealing performance of a fluid transfer pump includes a fluid pump, a cavity fixedly connected to the top of the fluid pump, a drive shaft disposed inside the top of the fluid pump, an assembly jacket detachably connected inside the cavity, a reference ring one fixedly connected inside the assembly jacket, a reference ring two fixedly connected inside the assembly jacket, an oil seal one detachably connected inside the assembly jacket, an oil seal two detachably connected inside the assembly jacket, and a top cover threadedly connected to the outer top of the assembly jacket, with a protective component for preventing dust disposed in the middle of the top cover;

[0008] As a further description of the above technical solution:

[0009] The protective component includes a corrugated pipe dust cover, with a fixing ring fixedly connected to the bottom end of the corrugated pipe dust cover, a corrugated recessed surface provided at the top outer end of the corrugated pipe dust cover, and an oblique ring provided in the middle of the outer side of the corrugated pipe dust cover.

[0010] As a further description of the above technical solution:

[0011] The outer bottom end of the assembly sleeve is provided with an annular groove, and the interior of the assembly sleeve is slidably connected to the outside of the drive shaft;

[0012] As a further description of the above technical solution:

[0013] A stationary ring is detachably connected inside the annular groove, and the outside of the stationary ring is slidably connected to the inner wall of the cavity.

[0014] As a further description of the above technical solution:

[0015] The inner surface of oil seal one is slidably connected to the outside of the drive shaft, and the inner surface of oil seal two is slidably connected to the outside of the drive shaft;

[0016] As a further description of the above technical solution:

[0017] The outer bottom end of the first oil seal is in contact with the top end of the first reference ring, and the outer top end of the first oil seal is in contact with the top end of the second reference ring.

[0018] As a further description of the above technical solution:

[0019] The outer bottom end of the second oil seal contacts the top end of the second reference ring, and the bottom end of the top cover is detachably connected to the inner wall of the cavity.

[0020] As a further description of the above technical solution:

[0021] The outer part of the corrugated dust cover engages with the inner wall of the top cover, the outer part of the fixing ring engages with the top of the assembly sleeve, and the middle part of the corrugated dust cover is slidably connected to the outside of the drive shaft.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, by assembling a jacket, installing a stationary ring on the outside, installing oil seal one and oil seal two inside, and then fitting it onto the outside of the drive shaft, and locking the position of the assembled jacket with the top cover thread, the two sealing barriers are set up. Even if the performance of the first oil seal deteriorates due to wear or impurities, the second oil seal can still provide an effective seal, thereby significantly reducing the risk of fluid leakage and improving the overall sealing reliability.

[0024] 2. In this utility model, the special corrugated shape of the corrugated concave surface increases the contact area and sealing between the corrugated pipe dust cover and the drive shaft. Combined with the inclined ring facing downward to fit the top cover surface, dust accumulation is reduced. The corrugated pipe dust cover will generate elastic deformation with the movement of the shaft, effectively compensating for the axial displacement and radial runout of the shaft and preventing dust from entering from the gaps. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a shaft sealing device for enhancing the sealing performance of a fluid transfer pump, as proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the assembly jacket of a shaft sealing device for enhancing the sealing performance of a fluid transfer pump, as proposed in this utility model.

[0027] Figure 3 An exploded view of the oil seal of a shaft seal device for enhancing the sealing performance of a fluid transfer pump, as proposed in this utility model.

[0028] Figure 4 This is a schematic diagram of the structure of a bellows dust cover for a shaft sealing device that enhances the sealing performance of a fluid transfer pump, as proposed in this utility model.

[0029] Legend:

[0030] 1. Fluid pump; 2. Cavity; 3. Drive shaft; 4. Assembly jacket; 5. Annular groove; 6. Stationary ring; 7. Reference ring one; 8. Reference ring two; 9. Oil seal one; 10. Oil seal two; 11. Top cover; 12. Corrugated pipe dust cover; 13. Fixing ring; 14. Corrugated recessed surface; 15. Inclined ring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1 to 3 This utility model provides one embodiment: a shaft sealing device for enhancing the sealing performance of a fluid transfer pump, comprising a fluid pump 1 for transporting various fluids. A cavity 2 is fixedly connected to the top of the fluid pump 1, and the cavity 2, as part of the fluid pump 1, provides installation space and protection for the drive shaft 3 and the shaft sealing device. The drive shaft 3 is disposed inside the top of the fluid pump 1, and the drive shaft 3 can transmit the rotational motion of an external power source motor to the impeller inside the fluid pump 1.

[0033] The cavity 2 has a detachably connected assembly jacket 4, which supports the components to form a complete shaft sealing system. The assembly jacket 4 is internally slidably connected to the outside of the drive shaft 3. The assembly jacket 4, fitted over the outside of the drive shaft 3, effectively prevents fluid leakage and dust ingress, improving the sealing performance and reliability of the fluid pump 1. An annular groove 5 is provided at the bottom of the outer side of the assembly jacket 4.

[0034] refer to Figure 2 , Figure 3 A stationary ring 6 is detachably connected inside the annular groove 5. The stationary ring 6 is externally slidably connected to the inner wall of the cavity 2. The annular groove 5 is specifically designed for installing the stationary ring 6, providing a precise positioning and installation space for the stationary ring 6, ensuring that the stationary ring 6 can fit tightly with the inner wall of the cavity 2 to form an effective sealing surface. The stationary ring 6 is used to prevent fluid leakage at the gap between the assembly jacket 4 and the cavity 2. A reference ring 7 is fixedly connected inside the assembly jacket 4. The outer diameter of the reference ring 7 is adapted to the internal structure of the assembly jacket 4 and is firmly fixed inside the assembly jacket 4 by welding. A reference ring 8 is also fixedly connected inside the assembly jacket 4. The outer diameter design of the reference ring 8 is coordinated with that of the reference ring 7. The internal assembly jacket 4 is detachably connected to an oil seal 9. The oil seal 9 is the first line of sealing defense in the shaft sealing device of the fluid pump 1. Its inner sealing lip forms a thin oil film on the surface of the shaft, which plays a lubricating role, reduces friction between the sealing lip and the shaft, reduces wear and energy consumption, and extends the service life of the oil seal. The outer sealing lip blocks the oil on the high-pressure side, preventing the oil from leaking out from the gap between the shaft and the oil seal, ensuring the normal operation and efficient work of the fluid pump 1.

[0035] Oil seal 9 is internally slidably connected to the outside of drive shaft 3. The internal sealing lip of oil seal 9 has a circular hole that fits tightly against drive shaft 3. The hole diameter is slightly smaller than the outer diameter of drive shaft 3. An interference fit achieves a sealed connection with the shaft, allowing it to slide flexibly as drive shaft 3 rotates while maintaining good sealing performance. The bottom outer end of oil seal 9 contacts the top end of reference ring 7, and the top outer end of oil seal 9 contacts the top end of reference ring 8. The external shape of oil seal 9 is designed according to the fitting requirements with reference ring 7 and reference ring 8.

[0036] The assembly jacket 4 is internally detachably connected to an oil seal 10, which serves as a backup for the shaft sealing device. When oil seal 9 wears or is damaged due to long-term use or the influence of impurities in the conveyed fluid, oil seal 10 can promptly take over the sealing function of oil seal 9, continuing to prevent oil leakage and effectively increasing the sealing performance of the fluid pump 1 drive shaft 3. Oil seal 10 is internally slidably connected to the outside of the drive shaft 3, communicating with oil seal 9. It is also a ring-shaped seal made of elastic material, with its inner sealing lip tightly fitted to the drive shaft 3. The outer bottom end of oil seal 10 contacts the top end of reference ring 8, and oil seal 10 is confined by reference ring 8 to the inner middle position of the assembly jacket 4. A top cover 11 is threadedly connected to the outer top end of the assembly jacket 4. The bottom end of the top cover 11 is detachably connected to the inner wall of the cavity 2. The top cover 11 serves as the top protective component of the shaft sealing device and is fixed to the inner wall of the cavity 2 by bolts.

[0037] refer to Figure 1 , Figure 4 The top cover 11 has a protective component in the middle to prevent dust. The protective component includes a bellows dust cover 12, which is mainly used to prevent dust, impurities and other small particles from entering the shaft seal device. The middle part of the bellows dust cover 12 is slidably connected to the outside of the drive shaft 3. When the drive shaft 3 is running, the corrugated concave surface 14 of the bellows dust cover 12 will rub against the drive shaft 3 as it rotates.

[0038] The outer surface of the bellows dust cover 12 engages with the inner wall of the top cover 11. Through this tight fit with the top cover 11 and the assembly jacket 4, the bellows dust cover 12 further improves the overall sealing performance and reliability of the shaft sealing device, ensuring that the fluid pump 1 can operate stably and efficiently in various complex working environments. A fixing ring 13 is fixedly connected to the bottom end of the bellows dust cover 12. The outer surface of the fixing ring 13 engages with the top end of the assembly jacket 4. The fixing ring 13 securely fixes the bottom end of the bellows dust cover 12 to the top end of the assembly jacket 4, ensuring that the bellows dust cover 12 will not undergo axial displacement or fall off during the operation of the drive shaft 3. The top of the corrugated dust cover 12 has a corrugated recessed surface 14. When the drive shaft 3 rotates, the corrugated recessed surface 14 comes into close contact with the surface of the drive shaft 3 and generates friction. The rotational force of the drive shaft 3 causes the corrugated dust cover 12 to elastically deform, ensuring that the corrugated dust cover 12 always fits tightly against the surface of the drive shaft 3, effectively preventing dust, impurities, and other small particles from entering the shaft seal device. A beveled ring 15 is provided in the middle of the outer surface of the corrugated dust cover 12. The beveled ring 15 allows the corrugated dust cover 12 to protrude from the top cover 11, fitting at an angle to prevent dust accumulation.

[0039] Working principle: In use, first install the reference ring 7 at the annular groove 5 of the assembly jacket 4, then insert the oil seal 9 between the reference ring 7 and the reference ring 8, and insert the oil seal 10 into the top of the reference ring 8. Then, put the assembled assembly jacket 4 on the outside of the drive shaft 3 and insert it into the cavity 2 to lock and fix it. Finally, install the bellows dust cover 12 on the top of the assembly jacket 4, and then install it through the thread in the middle of the assembly jacket 4 and the external thread at the top of the assembly jacket 4 to complete the double oil seal of the fluid pump 1.

[0040] During the operation of the fluid pump 1, the inner sealing lips of oil seal 9 and oil seal 10 form a thin oil film on the surface of the shaft. This oil film acts as a lubricant, thereby reducing friction between the sealing lips and the shaft. At the same time, the outer sealing lips of oil seal 9 and oil seal 10 block the oil on the high-pressure side, preventing the oil from leaking out from the gap between the shaft and the oil seal. In addition, when conveying fluids containing impurities, if the impurities cause some wear to oil seal 9, oil seal 10 can act as a backup defense to prevent fluid leakage, effectively increasing the sealing performance of the transmission shaft 3 of the fluid pump 1.

[0041] When the drive shaft 3 is running, the corrugated concave surface 14 of the bellows dust cover 12 will rub against the rotation of the drive shaft 3, and thus be driven upward by the surface of the drive shaft 3 to produce elastic deformation. This ensures that the bellows dust cover 12 is in close contact with the drive shaft 3, and ensures that the positions of the inclined ring 15 and the fixing ring 13 are not affected and deformed. This achieves effective dust prevention while assisting in the assembly of the jacket 4 to increase the sealing effect.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 shaft seal device for enhancing the sealing performance of a fluid transfer pump, comprising a fluid pump (1), characterized in that: The top of the fluid pump (1) is fixedly connected to a cavity (2), and a drive shaft (3) is provided inside the top of the fluid pump (1). An assembly jacket (4) is detachably connected inside the cavity (2). A reference ring one (7) is fixedly connected inside the assembly jacket (4). A reference ring two (8) is fixedly connected inside the assembly jacket (4). An oil seal one (9) is detachably connected inside the assembly jacket (4). An oil seal two (10) is detachably connected inside the assembly jacket (4). A top cover (11) is threadedly connected to the top of the assembly jacket (4). A protective component for preventing dust is provided in the middle of the top cover (11).

2. The shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 1, characterized in that: The protective component includes a corrugated pipe dust cover (12), a fixing ring (13) is fixedly connected to the bottom end of the corrugated pipe dust cover (12), a corrugated recessed surface (14) is provided at the top outer end of the corrugated pipe dust cover (12), and a slanted ring (15) is provided in the middle outer part of the corrugated pipe dust cover (12).

3. The shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 1, characterized in that: The assembly sleeve (4) has an annular groove (5) at its outer bottom end, and the interior of the assembly sleeve (4) is slidably connected to the outside of the transmission shaft (3).

4. A shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 3, characterized in that: The annular groove (5) is detachably connected to a stationary ring (6), and the outside of the stationary ring (6) is slidably connected to the inner wall of the cavity (2).

5. A shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 1, characterized in that: The oil seal one (9) is internally slidably connected to the outside of the drive shaft (3), and the oil seal two (10) is internally slidably connected to the outside of the drive shaft (3).

6. A shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 1, characterized in that: The outer bottom end of the oil seal one (9) is in contact with the top end of the reference ring one (7), and the outer top end of the oil seal one (9) is in contact with the top end of the reference ring two (8).

7. A shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 1, characterized in that: The outer bottom end of the second oil seal (10) is in contact with the top end of the second reference ring (8), and the bottom end of the top cover (11) is detachably connected to the inner wall of the cavity (2).

8. A shaft seal device for enhancing the sealing performance of a fluid transfer pump according to claim 2, characterized in that: The outer side of the corrugated dust cover (12) engages with the inner wall of the top cover (11), the outer side of the fixing ring (13) engages with the top end of the assembly sleeve (4), and the middle part of the corrugated dust cover (12) is slidably connected to the outside of the drive shaft (3).

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