Mechanical seal structure applied to circulating pump

Abstract

The application discloses a mechanical sealing structure applied to a circulating pump, which comprises a shaft sleeve, a movable ring, a static ring, a gland, a driving ring, a compensation mechanism and a flushing structure, the movable ring and the static ring are attached to form a sealing end face, the movable ring shaft sleeve is linked, the static ring is fixed on the anti-rotation pin of the gland, the compensation mechanism provides elastic pre-tightening force, the flushing structure performs medium flushing on the sealing end face, a plurality of sealing rings are arranged between the components to guarantee the sealing property, meanwhile, the driving ring is connected with the shaft sleeve and the gland through corresponding connecting and positioning structures, the flushing structure is provided with specific inlets and distribution channels, and the contact end face of the movable ring and the static ring is made of silicon carbide material. The application has the technical effects of improving the sealing property and reliability of the mechanical sealing structure, effectively preventing medium leakage, reducing abrasion and prolonging the service life.

Description

Technical Field

[0001] This application relates to the field of mechanical seals, and more particularly to a mechanical seal structure for use in circulating pumps. Background Technology

[0002] In industrial production and various engineering projects, circulating pumps are widely used as key equipment in multiple stages such as liquid transportation and energy circulation. Their performance plays a crucial role in the stability and operational efficiency of the entire system. Therefore, the reliability and performance requirements of each component are even more stringent. Sealing technology, as one of the key factors ensuring the normal operation of circulating pumps, is becoming increasingly important with the continuous development of industrial technology. A good sealing structure can effectively prevent liquid leakage, improve energy utilization efficiency, reduce equipment failures and maintenance costs, thereby improving the overall operational quality and economic benefits of the circulating pump system.

[0003] In the past, the sealing technology of circulating pumps typically employed packing seals to address sealing problems in similar pumps. This method involves tightly wrapping packing material around the shaft, relying on the friction between the packing and the shaft to achieve a seal. In practice, the appropriate packing size is selected based on the shaft dimensions and operating requirements, and then installed within the corresponding sealing cavity. Other common sealing methods include rubber ring seals, which utilize the elastic deformation of rubber to fill the sealing gap; and labyrinth seals, which increase resistance to fluid leakage by creating complex, tortuous channels. These traditional sealing methods can meet basic sealing needs to a certain extent and have been used in industry for many years, making their technology relatively mature. However, each of these sealing methods has its own characteristics and applicable scope, requiring careful selection under different operating conditions.

[0004] However, existing traditional sealing technologies such as packing seals have significant drawbacks. Because the packing is in direct contact with the shaft, it is highly susceptible to wear on the shaft or shaft sleeve during long-term operation. This wear not only affects the service life of the shaft and shaft sleeve but may also lead to a decrease in the pump's operational stability. Furthermore, the worn seal structure exhibits poor sealing performance, resulting in leakage, which not only wastes liquid but may also increase energy consumption. In addition, these traditional sealing structures have a relatively short service life, requiring periodic component replacement, which significantly increases maintenance costs. Summary of the Invention

[0005] In order to extend the service life of the sealing structure of the circulating pump, this application provides a mechanical seal structure for use in the circulating pump.

[0006] The mechanical seal structure for a circulating pump provided in this application adopts the following technical solution:

[0007] A mechanical seal structure for a circulating pump includes a shaft sleeve, a gland, a rotating ring, a stationary ring, a drive ring, a compensation mechanism, and a flushing structure. The gland is sleeved on the outer circumference of the shaft sleeve. The rotating ring and the stationary ring are both sleeved on the outer circumference of the shaft sleeve and distributed along the axial direction of the shaft sleeve. The rotating ring and the stationary ring form a sealing end face that fits against each other. The rotating ring is linked to the shaft sleeve, and the stationary ring is fixed to the anti-rotation pin of the gland. The compensation mechanism is used to force the rotating ring and the stationary ring to abut against each other, providing an elastic preload force to the sealing end face. The flushing structure is used to flush the rotating ring and the stationary ring with the medium.

[0008] By adopting the above technical solution, an end face sealing pair that can prevent the medium from leaking through the sealing surface is formed, and the elastic pre-tightening force provided by the compensation mechanism makes the leakage amount extremely small, meeting the field requirements; the flushing structure's dynamic ring and stationary ring flush the medium, reducing the impact of the medium on the sealing end face, thereby improving the operating environment and extending the service life; in addition, the dynamic ring is linked to the bushing and the stationary ring is fixed to the gland anti-rotation pin to achieve the mechanical seal function.

[0009] Preferably, a first sealing ring is provided between the bushing and the rotating ring, and a second sealing ring is provided between the stationary ring and the gland.

[0010] By adopting the above technical solution, a first sealing ring is set between the bushing and the rotating ring, and a second sealing ring is set between the stationary ring and the gland, which can further enhance the sealing performance of the mechanical seal structure and reduce the amount of media leakage.

[0011] Preferably, the drive ring and the bushing are connected by a fastener, which passes through the drive ring and abuts against the outer wall of the bushing.

[0012] By adopting the above technical solution, the drive ring and the bushing are connected by fasteners that pass through the drive ring and abut against the outer wall of the bushing. This allows the dynamic ring and the bushing to move in a stable manner, ensuring the normal operation of the sealing structure and preventing media leakage. At the same time, the elastic pre-tightening of the compensation mechanism minimizes leakage, and the flushing structure improves the operating environment and extends the service life.

[0013] Preferably, a positioning block is provided between the drive ring and the pressure cap, and the positioning block is fixed to the outer surface of the pressure cap by fasteners.

[0014] By adopting the above technical solution, the positioning block is set between the drive ring and the gland and fixed to the outer surface of the gland with fasteners. This ensures the accuracy and stability of the position between the drive ring and the gland, thereby ensuring the tightness and stability of the fit between the dynamic ring and the stationary ring, improving sealing performance, reducing leakage, and meeting on-site requirements. At the same time, it helps to maintain the stable operation of the entire mechanical seal structure, reduce the risk of failure caused by component displacement, further extend the service life of the mechanical seal structure, and reduce maintenance costs.

[0015] Preferably, a limiting groove is formed on the radial outer side of the stationary ring, and the anti-rotation pin of the pressure cap is embedded in the limiting groove to restrict the circumferential rotation of the stationary ring.

[0016] By adopting the above technical solution, a limiting groove is opened on the radial outer side of the stationary ring, and the anti-rotation pin of the gland is embedded in the limiting groove to restrict the circumferential rotation of the stationary ring, which can ensure the stability of the stationary ring position, thereby ensuring the stability and reliability of the sealing structure.

[0017] Preferably, the flushing structure includes a flushing water inlet and a distribution channel disposed at the pressure cap, the distribution channel being disposed around the sealing end face and connected to the flushing water inlet.

[0018] By adopting the above technical solution, the flushing water inlet of the flushing structure and the distribution channel that surrounds and connects to the flushing water inlet can flush the sealing end face composed of dynamic and static rings with media, improve the operating environment, and extend the service life of the mechanical seal structure.

[0019] Preferably, the compensation mechanism includes a spring seat, a spring, and a push ring, with one end of the spring abutting against the spring seat and the other end connected to the stationary ring via the push ring.

[0020] By adopting the above technical solution, the compensation mechanism specifically consists of one end of a spring abutting against a spring seat and the other end connected to a stationary ring via a push ring. This allows the end face sealing pair to be pre-tightened by the elastic element, minimizing leakage to meet on-site requirements.

[0021] Preferably, a third sealing ring is provided on the contact surface between the gland and the pump body, and the fourth sealing ring extends around the outer periphery of the stationary ring.

[0022] By adopting the above technical solution, a third sealing ring extending around the outer circumference of the stationary ring is set on the contact surface between the gland and the pump body, which can further prevent media leakage and enhance the sealing performance of the mechanical seal structure.

[0023] Preferably, the inner wall of the drive ring is provided with an annular groove that matches the outer wall of the bushing, and the bottom surface of the groove is provided with a through transmission hole for the fastener to pass through.

[0024] By adopting the above technical solution, the inner wall of the drive ring is provided with an annular groove that matches the outer wall of the bushing, and a transmission hole is opened on the bottom surface of the groove for fasteners to pass through, which can ensure a more stable transmission connection between the drive ring and the bushing, and ensure the stability and reliability of the entire mechanical seal structure.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The sealing end face is elastically pre-tightened by the compensation mechanism, resulting in minimal leakage, which can meet on-site requirements;

[0027] 2. The flushing structure flushes the sealing end face with media, improving the operating environment and supporting quick overall replacement, reducing downtime;

[0028] 3. The installation of the first sealing ring, the second sealing ring, and the third sealing ring can further prevent media leakage and enhance the sealing performance of the mechanical seal structure. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of a mechanical seal structure applied to a circulating pump according to an embodiment of this application.

[0030] Figure 2 This is a schematic diagram showing the location of the flushing structure in a mechanical seal structure applied to a circulating pump according to an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Fourth sealing ring; 2. First sealing ring; 3. Third sealing ring; 4. Second sealing ring; 5. Positioning block; 6. Cylindrical head set screw; 7. Bushing; 8. Moving ring; 9. Stationary ring; 10. Pressure cap; 11. Compensation mechanism; 12. Drive ring; 13. Concave end set screw; F. Flushing structure. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 and attached Figure 2 This application will be described in further detail.

[0033] This application discloses a mechanical seal structure for use in a circulating pump, referring to... Figure 1 and Figure 2The system includes a bushing 7, a rotating ring 8, a stationary ring 9, a gland 10, a drive ring 12, a compensation mechanism 11, and a flushing structure F. The gland 10 is fitted around the outer circumference of the bushing 7. Both the rotating ring 8 and the stationary ring 9 are fitted around the outer circumference of the bushing 7 and distributed along its axial direction. The rotating ring 8 and the stationary ring 9 form a sealing end face fit together and are linked to the bushing 7. The stationary ring 9 is fixed to the anti-rotation pin of the gland 10. The compensation mechanism 11 provides elastic pre-tightening force to the sealing end face, and the flushing structure F flushes the sealing end face with media. This achieves the beneficial effects of preventing media leakage, ensuring sealing performance, and improving the operating environment of the sealing surface. This is because the fitted sealing end face effectively prevents media from passing through, the elastic pre-tightening force provided by the compensation mechanism 11 ensures that the sealing end face remains tightly fitted, and the flushing structure F promptly removes impurities and heat between the sealing surfaces, maintaining good operating conditions.

[0034] Specifically, the bushing 7 is the basic supporting component of the entire mechanical seal structure. It is generally made of high-strength, corrosion-resistant metal materials, such as stainless steel, and is usually cylindrical in shape to fit onto the pump shaft. The bushing 7 can be replaced by a sleeve structure with similar support and connection functions. The outer circumference of the bushing 7 has a specific groove for accommodating the rotating ring 8. A first sealing ring 2 is provided between the bushing 7 and the rotating ring 8. The first sealing ring 2 is located on the inner circumferential wall of the specific groove and the outer circumferential wall of the rotating ring 8. The first sealing ring 2 is usually a rubber O-ring, which has good elasticity and sealing performance. It effectively prevents the medium from leaking from the gap between the bushing 7 and the rotating ring 8. The first sealing ring 2 can also be replaced by a lip seal.

[0035] The rotating ring 8 is a component that rotates together with the bushing 7. Its contact surface with the stationary ring 9 requires precision machining to ensure flatness and smoothness. The rotating ring 8 is often made of silicon carbide, a material with high hardness and good wear resistance. Replaceable materials for the rotating ring 8 include ceramics. The drive ring 12 is fitted around the outer circumference of the bushing 7, and its inner wall has an annular groove that matches the outer wall of the bushing 7. A through-hole is formed at the bottom of this groove. The drive ring 12 is typically made of metal, providing high strength and ensuring transmission stability. The drive ring 12 can also be made of high-strength plastic. The drive ring 12 and the bushing 7 are connected by fasteners, typically recessed set screws 13, which penetrate the transmission hole of the drive ring 12 and abut against the outer wall of the bushing 7, thus achieving reliable linkage between the drive ring 12 and the bushing 7.

[0036] The stationary ring 9 is fixed to the anti-rotation pin of the gland 10 to prevent it from rotating with the rotating ring 8. A limiting groove is formed on the radially outer side of the stationary ring 9, and the anti-rotation pin of the gland 10 is embedded in the limiting groove to restrict the circumferential rotation of the stationary ring 9. A second sealing ring 4, typically a rubber O-ring, is installed inside the stationary ring 9 in the gap between the stationary ring 9 and the gland 10 to prevent media leakage from this gap. The second sealing ring 4 can also be replaced with a wedge-shaped sealing ring. The stationary ring 9 and the rotating ring 8 fit tightly together to form a sealing end face; the precision of their fit directly affects the sealing effect.

[0037] The gland 10 is the external fixing component of the entire sealing structure. It is generally made using a casting process, and the material is mostly cast iron or cast steel, possessing sufficient strength and rigidity. The anti-rotation pin of the gland 10 is used to fix the stationary ring 9. The anti-rotation pin protrudes a certain length from the surface of the gland 10 and can be accurately inserted into the limiting groove of the stationary ring 9. A third sealing ring 3 is provided on the contact surface between the gland 10 and the pump body. The third sealing ring 3 is usually made of rubber and extends in a ring around the outer circumference of the stationary ring 9 to prevent the medium from leaking from the connection between the gland 10 and the pump body. The third sealing ring 3 can also be replaced with a corrugated sealing ring.

[0038] In this embodiment, a fourth sealing ring 1 is provided between the inner side of the bushing 7 and the pump shaft to prevent the medium from leaking from the connection between the bushing 7 and the pump shaft.

[0039] In this embodiment, the compensation mechanism 11 provides an elastic preload to the sealing end face. It includes a spring seat, a spring, and a push ring. The spring seat is typically disc-shaped and fixed at a specific mounting position inside the bushing 7. One end of the spring abuts against the spring seat, and the other end is connected to the stationary ring 9 via the push ring. A helical spring is generally used, as it has stable elastic properties and can continuously apply elastic force to the stationary ring 9, ensuring a tight fit between the sealing end faces. A disc spring can also be used instead.

[0040] In this embodiment, the flushing structure F includes a flushing water inlet and a distribution channel disposed within the end cap. The flushing water inlet is connected to an external flushing medium supply source, typically via a pipeline connection. The distribution channel surrounds the sealing end face and connects to the flushing water inlet; it is generally an annular channel machined into the gland 10 or related components. After entering the distribution channel from the inlet, the flushing water evenly flushes the moving ring 8, the stationary ring 9, and their sealing end faces, carrying away impurities and heat between the sealing surfaces. The distribution channel can also be designed as multiple branch pipes.

[0041] In this embodiment, a positioning block 5 is provided between the drive ring 12 and the gland 10. The positioning block 5 is generally made of metal or plastic and has a certain thickness and strength. The positioning block 5 is fixed to the outer surface of the gland 10 by fasteners, which are mostly cylindrical head set screws 6. The function of the positioning block 5 is to further stabilize the relative position of the drive ring 12 and the gland 10, ensuring the stability of the entire mechanical seal structure. The positioning block 5 can also be replaced by a protruding structure with positioning and support functions. The setting of the positioning block 5 enhances the connection stability between the drive ring 12 and the gland 10, avoids the shaking and displacement of the drive ring 12 during operation, thereby improving the reliability and sealing performance of the entire mechanical seal structure. Compared with the prior art, this further optimizes the structure, reduces the sealing failure problem caused by component loosening, and reduces maintenance costs and equipment failure risks, which has obvious advantages.

[0042] The implementation principle of this embodiment is as follows: Through reasonable structural design and the coordinated operation of its components, the mechanical seal structure of this embodiment effectively solves the problems of large leakage, easy wear of the shaft or bushing 7, and short service life inherent in traditional sealing structures. The fitting arrangement of the sealing end face and the elastic pre-tightening force provided by the compensation mechanism 11 ensure a good sealing effect and prevent media leakage. The flushing structure F improves the operating environment of the sealing surface, reduces wear and heat accumulation, and extends the service life of the sealing components. Simultaneously, the arrangement of each sealing ring further improves sealing performance and reduces maintenance costs, representing a significant improvement and contribution to existing technology.

[0043] The implementation principle of this embodiment is as follows: Through reasonable structural design and the coordinated operation of its components, the mechanical seal structure of this embodiment effectively solves the problems of large leakage, easy wear of the shaft or bushing 7, and short service life inherent in traditional sealing structures. The fitting arrangement of the sealing end face and the elastic pre-tightening force provided by the compensation mechanism 11 ensure a good sealing effect and prevent media leakage. The flushing structure F improves the operating environment of the sealing surface, reduces wear and heat accumulation, and extends the service life of the sealing components. Simultaneously, the arrangement of each sealing ring further improves sealing performance and reduces maintenance costs, representing a significant improvement and contribution to existing technology.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mechanical seal structure for use in a circulating pump, characterized in that: The device includes a bushing (7), a gland (10), a moving ring (8), a stationary ring (9), a drive ring (12), a compensation mechanism (11), and a flushing structure (F). The gland (10) is fitted around the outer periphery of the bushing (7). The moving ring (8) and the stationary ring (9) are both fitted around the outer periphery of the bushing (7) and distributed along the axial direction of the bushing (7). The moving ring (8) and the stationary ring (9) form a sealing end face that fits together. The moving ring (8) is linked through the bushing (7). The stationary ring (9) is fixed on the anti-rotation pin of the gland (10). The compensation mechanism (11) is used to force the moving ring (8) and the stationary ring (9) to press against each other, providing elastic pre-tightening force for the sealing end face. The flushing structure (F) is used to flush the moving ring (8) and the stationary ring (9) with media.

2. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: A first sealing ring (2) is provided between the bushing (7) and the moving ring (8), and a second sealing ring (4) is provided between the stationary ring (9) and the pressure cap (10).

3. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: The drive ring (12) and the bushing (7) are connected by fasteners, which pass through the drive ring (12) and abut against the outer wall of the bushing (7).

4. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: A positioning block (5) is provided between the drive ring (12) and the pressure cap (10), and the positioning block (5) is fixed to the outer surface of the pressure cap (10) by fasteners.

5. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: A limiting groove is provided on the radial outer side of the stationary ring (9), and the anti-rotation pin of the pressure cap (10) is embedded in the limiting groove to restrict the circumferential rotation of the stationary ring (9).

6. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: The flushing structure (F) includes a flushing water inlet and a distribution channel disposed at the pressure cap (10), the distribution channel being disposed around the sealing end face and connected to the flushing water inlet.

7. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: The compensation mechanism (11) includes a spring seat, a spring and a push ring. One end of the spring abuts against the spring seat, and the other end is connected to the stationary ring (9) through the push ring.

8. The mechanical seal structure for a circulating pump according to claim 1, characterized in that: A third sealing ring (3) is provided on the contact surface between the gland (10) and the pump body, and the third sealing ring (3) extends around the outer periphery of the stationary ring (9).

9. A mechanical seal structure for a circulating pump according to claim 3, characterized in that: The inner wall of the drive ring (12) is provided with an annular groove that matches the outer wall of the bushing (7), and the bottom surface of the annular groove is provided with a through transmission hole for the fastener to pass through.

Images