Filler sealing structure for preventing filler from overflowing

Abstract

The invention discloses a packing sealing structure capable of preventing packing from overflowing, which comprises a pump body, a shaft sleeve sleeved on the outer side of the shaft, a packing box sleeved on the outer side of the shaft sleeve and matched with the pump body, and a ball valve arranged on the packing box, packing, double-sealing packing and a packing pad are filled in the packing cavity, and a packing gland for compressing the packing covers the opening of the packing box; the device has the beneficial effects that a traditional shaft water sealing position is replaced by the ball valve, meanwhile, the filling sequence and saturation control of the filler are optimized, the double-sealing filler is kept in a tight and void-free filling state in the filler cavity, and the problem that the filler in a traditional structure is prone to overflowing is fundamentally solved in cooperation with the blocking effect of the ball valve; and equipment pollution and environment cleaning workload caused by overflow of the filler are avoided.

Description

Technical Field

[0001] This invention belongs to the field of sealing and mechanical technology, and specifically relates to a packing seal structure that prevents packing overflow. Background Technology

[0002] In the fields of machinery manufacturing and fluid transportation, pumps are core fluid transportation equipment, and the sealing performance of their shafts directly determines the operational stability, service life, and safety of production operations. Due to their advantages such as simple structure, low manufacturing cost, and convenient installation, packing seals have become one of the most widely used sealing methods for pump shafts. Traditional packing seals mainly consist of components such as a stuffing box, stuffing gland, packing, water seal ring, and shaft sleeve. They rely on the tight contact between the packing and the shaft sleeve to form a sealing surface. At the same time, the sealing parts are cooled and flushed by the shaft seal water, reducing frictional loss between the packing and the shaft sleeve, carrying away the heat generated by friction, and preventing media leakage.

[0003] However, in actual industrial applications, traditional packing seal structures have revealed many intractable technical defects. The packing and bushing in traditional packing seal structures have a rigid frictional contact; even with cooling and flushing by sealing water, the bushing still experiences severe wear. This wear leads to a continuous increase in the sealing gap, requiring frequent replacement of both the bushing and packing, increasing the cost of consumable parts, and necessitating downtime for maintenance and replacement, severely impacting continuous production and significantly reducing efficiency. Furthermore, the continuous supply of sealing water not only wastes water resources but also easily mixes with the conveyed medium, reducing its purity. For production processes requiring high purity, this necessitates additional media separation processes, increasing the overall cost of production. Traditional packing seal structures... The traditional packing filling method is relatively simple. During pump operation, due to pressure impact and shaft rotation, the packing is prone to overflow from the gaps in the packing box. This not only affects the sealing effect, but the overflowing packing also pollutes the equipment and working environment, increasing the workload of on-site cleaning and maintenance. In addition, the sealing effect of traditional packing seal structures is poor, making it difficult to achieve zero leakage. For pumps conveying corrosive, flammable, explosive, toxic and harmful media, leakage of the media will not only cause unnecessary loss of materials, but also cause safety accidents, threatening the personal safety of on-site workers, and polluting the surrounding environment. The maintenance cycle of traditional packing seal structures is short, requiring staff to regularly inspect, tighten and replace the packing. The cost of manual maintenance is high, and frequent manual operation also increases the safety hazards of equipment operation.

[0004] Currently, the industry has made some simple improvements to address the shortcomings of traditional packing seal structures, such as replacing the packing material with one that has better wear resistance and optimizing the fastening method of the packing gland. However, these improvements can only alleviate the wear problem to a certain extent and cannot fundamentally solve the core problems such as packing overflow, severe shaft sleeve wear, the need for shaft seal water cooling, and the inability to seal without stopping the machine. They are still difficult to meet the industrial production requirements for pump body sealing structures with high sealing performance, long service life, low maintenance costs, and online repairability. Summary of the Invention

[0005] The purpose of this invention is to provide a packing seal structure that prevents packing overflow, effectively solving the problems of easy packing overflow and severe shaft sleeve wear in traditional structures, achieving non-stop sealing for pump products, eliminating the shaft seal water structure, avoiding unnecessary loss of medium and waste of water resources, reducing equipment maintenance costs and wear parts consumption costs, and improving the working efficiency of the pump body shaft and the stability of equipment operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a packing seal structure for preventing packing overflow, comprising a pump body, wherein a shaft and an impeller are disposed inside the pump body, and further comprising a bushing sleeve sleeved on the outside of the shaft, a packing box sleeved on the outside of the bushing sleeve and cooperating with the pump body, and a ball valve disposed on the packing box, wherein a packing cavity is formed between the packing box and the bushing sleeve, and the packing cavity is filled with packing, double-seal packing, and packing gasket, and a packing gland covering the opening of the packing box to compress the packing.

[0007] Preferably, the double-sealed packing is processed into a strip-shaped packing and filled into the packing cavity. The connection positions of each section of the double-sealed packing are set without gaps, so that the double-sealed packing maintains a preset saturation in the packing cavity.

[0008] Preferably, the preset saturation of the double-seal packing is a filling state with no voids and not excessively compressed, and the double-seal packing and the bushing are in flexible contact fit.

[0009] Preferably, the packing pad is installed at the bottom of the packing cavity, and after the packing pad is pressed and compacted, it remains flat and does not rotate relative to the bushing or the packing box.

[0010] Preferably, there are two packing rings, one packing ring is disposed between the packing pad and the double-seal packing, and the other packing ring is disposed between the double-seal packing and the packing gland.

[0011] Preferably, the packing gland is pressed into the packing box to a depth of not less than mm, so that the packing gland is pressed tightly against the double-seal packing.

[0012] Preferably, the ball valve and the stuffing box are connected in a sealed manner, and the sealing end of the ball valve is connected to the stuffing cavity to prevent the double-sealed packing from overflowing from the connection position between the ball valve and the stuffing box.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The traditional shaft seal water position is replaced with a ball valve. At the same time, the packing sequence and saturation control are optimized. The double-seal packing is kept in a tight and gapless state in the packing cavity. Combined with the sealing effect of the ball valve, the problem of easy packing overflow in the traditional structure is fundamentally solved, avoiding equipment pollution and environmental cleanup caused by packing overflow.

[0015] Using double-seal packing as the core sealing component, and with reasonable filling saturation, a flexible sealing contact is formed between the double-seal packing and the bushing. There is basically no frictional heat generated, and no additional cooling or flushing measures are required. This greatly reduces the wear of the bushing, extends the service life of the bushing, and reduces the replacement frequency of vulnerable parts.

[0016] Double-seal packing can be replenished via a packing gun during pump operation, enabling online repair and maintenance of the sealing structure without stopping the pump for packing replacement and shaft sleeve repair. This ensures continuous operation of the pump equipment and improves production efficiency.

[0017] This structure eliminates the need for shaft seal water for cooling and rinsing, which not only saves water resources but also avoids the problem of reduced media purity caused by the mixing of shaft seal water and the conveying medium. It also eliminates the need for subsequent media separation processes, simplifies the piping structure of the equipment, and reduces the overall operating cost of the equipment.

[0018] The multi-layer sealing of the double-seal packing, combined with a precise filling method, greatly improves the sealing effect of the sealing structure, ensuring virtually zero leakage during pump operation. It is especially suitable for pumps conveying corrosive, flammable, explosive, toxic, and harmful media, enhancing the safety of equipment operation and preventing unnecessary loss of media.

[0019] With minimal wear on sealing components and no packing overflow, the sealing performance is stable, significantly extending the equipment maintenance cycle, reducing the need for regular inspections, tightening, and replacement operations by staff, lowering labor maintenance costs, and reducing equipment safety hazards caused by manual operation.

[0020] The main assembly components are consistent with the mating parts of the traditional packing seal structure, so there is no need to make major modifications to the original pump body structure. It can be directly upgraded and replaced on existing pump equipment, with low modification costs and easy promotion and application in the industry. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure of region H in the diagram;

[0023] In the picture:

[0024] 1. Stuffing box; 2. Ball valve; 3. Stuffing gland; 4. Packing; 5. Shaft; 51. Shaft sleeve; 6. Double seal packing; 8. Stuffing pad; 9. Pump body; 10. Impeller. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1 and Figure 2 This invention provides a packing seal structure to prevent packing overflow, including a pump body 9, with a shaft 5 and an impeller 10 disposed inside the pump body 9, and also including a bushing 51 sleeved on the outside of the shaft 5, a packing box 1 sleeved on the outside of the bushing 51 and cooperating with the pump body 9, and a ball valve 2 disposed on the packing box 1. A packing cavity is formed between the packing box 1 and the bushing 51, and the packing cavity is filled with packing 4, double-seal packing 6, and packing gasket 8. The opening of the packing box 1 is covered by a packing gland 3 that compresses the packing 4. The bushing 51 is separately sleeved on the shaft 5, which can effectively protect the shaft 5, avoid direct wear of the shaft, and extend the service life of the shaft 5. The design of the packing box 1 being adapted to the pump body 9 and the packing gland 3 compressing the packing 4 provides basic structural support for the subsequent filling of sealing components and the performance of sealing function. At the same time, the ball valve 2 replaces the traditional shaft seal water structure, structurally avoiding the problems of packing overflow and water waste of traditional seals.

[0027] In this embodiment, the double-seal packing 6 is processed into a strip-shaped packing and filled into the packing cavity. The connection positions of each section of the double-seal packing 6 are set without gaps, so that the double-seal packing 6 maintains a preset saturation in the packing cavity. The strip-shaped packing 6 is adapted to the cavity structure of the packing cavity, which facilitates filling and subsequent replenishment operations. The design of no gaps between each section can prevent the medium from leaking from the packing connection gaps and improve the sealing effect. Keeping the double-seal packing 6 at a preset saturation can ensure the contact sealing between the packing and the bushing 51 and the stuffing box 1, and at the same time provide a premise for flexible contact, avoiding the problem of sealing gaps due to the packing being too loose or excessive wear due to the packing being too tight.

[0028] In this embodiment, the preset saturation of the double-seal packing 6 is a filling state without gaps and without excessive compression. The double-seal packing 6 and the bushing 51 have a flexible contact fit. The gapless filling state ensures the tightness of the seal and eliminates the medium leakage channel. The design without excessive compression avoids rigid compression between the packing and the bushing 51. The flexible contact fit replaces the traditional rigid friction contact, which greatly reduces the wear of the bushing 51, reduces the replacement frequency and maintenance cost of the bushing 51, and at the same time, it basically does not generate frictional heat, eliminating the cooling and flushing process of traditional seals and simplifying the equipment operation process.

[0029] In this embodiment, the packing pad 8 is installed at the bottom of the packing cavity, and after being pressed and compacted, the packing pad 8 remains flat and does not rotate relative to the bushing 51 or the stuffing box 1. The packing pad 8 is located at the bottom of the packing cavity, providing stable bottom support for the packing 4 and double-seal packing 6 above, preventing the sealing components from moving downwards during pump operation. Pressing and compacting the packing pad 8 and keeping it flat ensures its sealing base function and prevents the medium from leaking from the bottom of the packing cavity. The absence of relative rotation with the bushing 51 and the stuffing box 1 avoids wear and displacement of the packing pad 8 caused by the operation of the pump body 9, ensuring the stability of the bottom sealing structure, and preventing the upper packing from deforming and gaps from appearing due to the rotation of the pad.

[0030] In this embodiment, there are two packing rings 4. One packing ring 4 is placed between the packing pad 8 and the double-seal packing 6, and the other packing ring 4 is placed between the double-seal packing 6 and the packing gland 3. The layered arrangement of the two packing rings 4 forms upper and lower protection and limit for the double-seal packing 6, avoiding packing wear and deformation caused by direct contact between the double-seal packing 6 and the packing pad 8 and the packing gland 3, and protecting the structural integrity of the core sealing component, the double-seal packing 6. The lower packing ring 4 can disperse the pressure of the double-seal packing 6 on the packing pad 8, and the upper packing ring 4 can evenly transmit the clamping force of the packing gland 3, so that the double-seal packing 6 is subjected to uniform force, improving the overall sealing effect. At the same time, the buffering effect of the packing ring 4 can reduce the impact of the pump body 9's operating vibration on the double-seal packing 6, and enhance the vibration resistance of the sealing structure.

[0031] In this embodiment, the packing gland 3 is pressed into the packing box 1 to a depth of not less than 5mm, so that the packing 4 pressed by the packing gland 3 is tightly fitted with the double-seal packing 6. This clarifies the installation depth standard of the packing gland 3, providing a quantifiable operational basis for actual assembly and ensuring assembly consistency. The pressing depth of not less than 5mm provides sufficient clamping force, ensuring that the upper packing 4 and the double-seal packing 6 are tightly fitted, eliminating the gap between them and preventing the medium from leaking from the mating surface. At the same time, the stable clamping force ensures that the double-seal packing 6 always maintains effective contact with the bushing 51, ensuring the continuity of the sealing effect and avoiding problems such as packing loosening and leakage caused by insufficient gland clamping.

[0032] In this embodiment, the ball valve 2 and the stuffing box 1 are connected in a sealed manner. The sealing end of the ball valve 2 is connected to the stuffing cavity to prevent the double-sealed packing 6 from overflowing from the connection position between the ball valve 2 and the stuffing box 1. The sealed connection between the ball valve 2 and the stuffing box 1 prevents the medium from leaking from the connection gap between the two, and at the same time avoids external impurities from entering the stuffing cavity and affecting the sealing effect. The sealing end of the ball valve 2 is connected to the stuffing cavity, which can directly seal the opening position of the stuffing cavity. Structurally, it completely solves the problem of packing overflow that is prone to occur at the traditional shaft seal water position, keeps the equipment and working environment clean, and reduces the amount of on-site cleaning and maintenance work. The structural design of the ball valve 2 can also be flexibly operated according to actual needs, which facilitates subsequent inspection of the stuffing cavity, packing replenishment and other operations, and improves the maintenance convenience of the sealing structure.

[0033] The working principle and usage process of this invention are as follows: Clean the old packing, water seal ring and other components of the original sealing structure inside the pump body 9; grind the mating surfaces of the shaft 5, shaft sleeve 51 and stuffing box 1 to remove impurities, oil stains and wear marks, and ensure that the mating surfaces of each component are flat and clean; accurately fit the shaft sleeve 51 on the outside of the shaft 5 of the pump body 9, then fit the stuffing box 1 on the outside of the shaft sleeve 51, and make the stuffing box 1 and the pump body 9 complete the sealing fit; at the same time, the ball valve 2 is sealed and installed in the preset position of the stuffing box 1 to complete the basic structure assembly. Place the packing pad 8 at the bottom of the packing cavity formed between the packing box 1 and the bushing 51. Use a special filling tool to press and compact the packing pad 8 to ensure that the packing pad 8 remains flat and does not rotate relative to the bushing 51 and the packing box 1. Then, fill the first packing 4 into the packing cavity and press it against the upper surface of the packing pad 8 to ensure that the two fit together without gaps. The double-seal packing 6 is processed into a strip-shaped packing and sequentially filled into the upper side of the first packing 4 in the packing cavity. During the filling process, it is ensured that there are no gaps at the connection positions of each section of the double-seal packing 6, so that the double-seal packing 6 maintains a preset saturation without gaps and is not overly compressed in the packing cavity. After filling, the double-seal packing 6 is slightly compressed to prevent it from loosening and shifting. On the upper side of the slightly compressed double-seal packing 6, the second packing 4 is installed, leaving room for the installation of the packing gland 3 during installation; the packing gland 3 is placed over the opening of the packing box 1, and the packing gland 3 is slowly pressed into the packing box 1, ensuring that the pressing depth is not less than 5mm, so that the packing gland 3 presses the second packing 4 tightly, and the packing 4 is in close contact with the double-seal packing 6, thus completing the overall assembly of the sealing structure; Start the pump body 9 to drive the shaft 5 and impeller 10 to run normally. Continuously observe the packing chamber, the connection position of ball valve 2, and the mating point between packing gland 3 and packing box 1 to check for problems such as medium leakage and packing loosening. If leakage occurs, stop the machine in time to adjust the tightness of packing gland 3 or add double-seal packing 6. If there is no leakage problem during the trial operation of pump body 9, keep the pump body running normally, use the packing gun to inject double sealing packing 6 into the packing cavity until the double sealing packing 6 slightly overflows from the mating point between the packing gland 3 and the packing box 1, then stop replenishing to ensure the sealing saturation of the double sealing packing 6 in the packing cavity and complete the final sealing. During normal operation of the pump body 9, the sealing structure can be used continuously without stopping the machine. If a slight decrease in sealing effect occurs later, there is no need to stop the machine. The double-sealing packing 6 can be added to the packing cavity through the packing gun until it overflows slightly to complete the online repair. The sealing status of the ball valve 2 and the wear of the bushing 51 should be checked regularly. If the ball valve 2 fails to seal, it should be replaced in time. If the bushing 51 has no obvious wear, it does not need to be disassembled and replaced, thus extending the maintenance cycle.

[0034] Although embodiments of the invention have been shown and described (see the detailed description above), 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 packing seal structure for preventing packing overflow, comprising a pump body (9), wherein a shaft (5) and an impeller (10) are disposed inside the pump body (9), characterized in that: It also includes a bushing (51) sleeved on the outside of the shaft (5), a stuffing box (1) sleeved on the outside of the bushing (51) and cooperating with the pump body (9), and a ball valve (2) set on the stuffing box (1). A stuffing cavity is formed between the stuffing box (1) and the bushing (51). The stuffing cavity is filled with packing (4), double sealing packing (6), and packing gasket (8). The opening of the stuffing box (1) is covered with a packing gland (3) that compresses the packing (4).

2. The packing seal structure for preventing packing overflow according to claim 1, characterized in that: The double-sealed packing (6) is processed into a strip-shaped packing and filled into the packing cavity. The connection positions of each section of the double-sealed packing (6) are set without gaps, so that the double-sealed packing (6) maintains a preset saturation in the packing cavity.

3. The packing seal structure for preventing packing overflow according to claim 2, characterized in that: The preset saturation of the double-seal packing (6) is a filling state without gaps and not excessively compressed, and the double-seal packing (6) and the bushing (51) are in flexible contact fit.

4. The packing seal structure for preventing packing overflow according to claim 1, characterized in that: The packing pad (8) is filled at the bottom of the packing cavity, and after the packing pad (8) is pressed and compacted, it remains flat and does not rotate relative to the bushing (51) or the packing box (1).

5. A packing seal structure for preventing packing overflow according to claim 1, characterized in that: There are two packings (4), one packing (4) is placed between the packing pad (8) and the double-sealed packing (6), and the other packing (4) is placed between the double-sealed packing (6) and the packing gland (3).

6. A packing seal structure for preventing packing overflow according to claim 1, characterized in that: The packing gland (3) is pressed into the packing box (1) to a depth of not less than 5mm, so that the packing gland (4) pressed by the packing gland (3) fits tightly with the double-sealed packing (6).

7. A packing seal structure for preventing packing overflow according to claim 1, characterized in that: The ball valve (2) and the stuffing box (1) are connected in a sealed manner. The sealing end of the ball valve (2) is connected to the stuffing cavity to prevent the double-sealed packing (6) from overflowing from the connection position between the ball valve (2) and the stuffing box (1).

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