Shaft sealing structure of booster pump

Abstract

The invention relates to the technical field of sealing structures of pumps, in particular to a shaft sealing structure of a booster pump, which comprises a shaft sleeve used for sleeving a shaft, and a sealing structure is arranged between the shaft sleeve and the shaft; the shaft sleeve is provided with a static ring used for installing the gland and further provided with a movable ring structure elastically abutting against the static ring, and when the shaft rotates, the movable ring structure is attached to the static ring in a sliding mode to achieve sealing. A heat dissipation gap is formed in the inner side of the gland, the friction face of the movable ring structure and the friction face of the static ring are located in the heat dissipation gap, and a liquid inlet channel communicated with the heat dissipation gap is formed in the gland. According to the invention, the matching mode of the static ring and the moving ring structure is optimized, so that the relative matching surfaces of the static ring and the moving ring structure are always kept in fit sealing in the rotating process, and good abutting sealing force can be kept under the action of elastic force. And meanwhile, cooling liquid is introduced into the heat dissipation gap through the liquid inlet channel, cooling of the friction face of the static ring and the movable ring structure is facilitated, and the service life of the sealing structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of pump sealing structures, and in particular to a shaft sealing structure of a booster pump. Background Art

[0002] In the technical transformation of the mechanical seal of the amine booster pump in the LNG plant, due to the large number of friction pairs in the original mechanical seal, more friction heat is generated, and the medium temperature is high. The mechanical seal operates at a high temperature for a long time. When the hardness of the circulating water or tap water is high (greater than 250mg / l), scaling is easy to occur on the friction surface of the mechanical seal and the O-ring of the dynamic ring. After the mechanical seal is scaled, the cooling effect is further deteriorated. When the scaling phenomenon is serious, it directly leads to damage and failure of the mechanical seal, resulting in leakage and loss of amine liquid. When the factory is in normal production, the average number of times the mechanical seal of the amine booster pump is replaced due to scaling is 2 times per year.

[0003] It can be seen that there is still room for improvement in the existing booster pump sealing structure. The sealing structure should be optimized to improve the reliability of the sealing structure, reduce the scaling problem existing in the sealing structure, and further reduce the damage caused by wear of the sealing structure, thereby increasing the service life of the sealing structure. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the prior art. Summary of the invention

[0004] In order to overcome at least one of the above-mentioned defects, the present invention proposes a booster pump shaft seal structure, which transforms the mechanical seal of the amine booster pump into a single-end balanced cartridge mechanical seal by changing the mechanical seal structure, and adopts a cooling method of circulating flushing on the back of the mechanical seal. At the same time, the material is improved to avoid the static ring from being broken due to excessive pump vibration or during assembly, and can effectively resist the corrosiveness of the medium.

[0005] In order to achieve the above-mentioned purpose, the sealing structure disclosed in the present invention can adopt the following technical solutions:

[0006] A shaft sealing structure for a booster pump comprises: a shaft sleeve for sleeve-connecting a shaft, a sealing structure being arranged between the shaft sleeve and the shaft; a stationary ring for mounting a gland is arranged on the shaft sleeve, and a dynamic ring structure elastically pressed against the stationary ring is also arranged, and when the shaft rotates, the dynamic ring structure and the stationary ring slide and fit together to achieve sealing; a heat dissipation gap is arranged on the inner side of the gland, and the friction surface between the dynamic ring structure and the stationary ring is located in the heat dissipation gap, and a liquid inlet channel communicating with the heat dissipation gap is arranged on the gland.

[0007] The shaft sealing structure disclosed above, through the elastic cooperation between the dynamic ring structure and the static ring, the dynamic ring structure and the static ring remain in contact with each other to form a seal during the rotation of the shaft; during the rotation process, cooling liquid is transported to the friction surface through the liquid inlet channel to reduce the temperature of the friction surface, thereby avoiding excessive temperature of the dynamic ring structure and the static ring during the rotation process.

[0008] Furthermore, in the present invention, the dynamic ring structure can be constructed in a variety of forms, which are not specifically limited. Here, an optimization is performed and one of the feasible options is proposed: the dynamic ring structure includes a dynamic ring member arranged on the shaft sleeve, and a dynamic ring seat is also arranged on the shaft sleeve. An elastic structure is arranged between the dynamic ring seat and the dynamic ring member, and the elastic structure applies an elastic force to the dynamic ring member to make the dynamic ring member fit and seal with the static ring. When such a scheme is adopted, the dynamic ring structure always keeps fit between the static ring, and the abutting surfaces of the two are flat surfaces. When the dynamic ring structure rotates with the shaft, the abutting surfaces always fit. In some feasible schemes, the dynamic ring structure and the static ring can be made of graphite and cemented carbide respectively, so that the static ring can be avoided from being damaged even when the pump jumps or collides during assembly.

[0009] Furthermore, the elastic structure used in the present invention is not limited to a single one, and it can adopt a variety of feasible solutions. Here, optimization is performed and one feasible option is proposed: the elastic structure includes a spring, one end of the spring applies an elastic force to the dynamic ring seat, and the other end of the spring applies an elastic force to the dynamic ring member. When such a solution is adopted, the spring pushes the dynamic ring member to fit the static ring and maintains the fitting force of the fitting surface to form a seal.

[0010] Furthermore, when the dynamic ring is pressed against the moving ring, a variety of structures can be used to achieve this. Here, an optimization is made and one of the feasible options is proposed: a spring groove is provided on the moving ring seat, the spring is located in the spring groove, and a push ring is provided between the spring and the moving ring, one side of the push ring is in contact with the moving ring, and the other side of the push ring is in contact with the spring. When such a solution is adopted, the spring groove can form a ring groove along the moving ring seat and place a spring for overall pressing support, or a plurality of empty grooves can be provided at intervals along the circumference of the moving ring seat and springs can be provided respectively for matching pressing support.

[0011] Furthermore, in order to improve the precision of the dynamic ring seat's push control on the dynamic ring component, the structure of the dynamic ring seat can be optimized and adjusted. Here, an optimization is made and one of the feasible options is proposed: the dynamic ring seat is provided with a clamping ring, which is located between the dynamic ring seat and the dynamic ring component and is used to fit and seal the gap between the dynamic ring component and the dynamic ring seat. When such a solution is adopted, the number of clamping rings corresponds to the number of springs, and the clamping ring is a circular ring.

[0012] Furthermore, in order to improve the sealing effect on the shaft, optimization is performed here and one of the feasible options is proposed; a dynamic ring seal is provided between the dynamic ring member and the shaft sleeve, and the dynamic ring seal is used to seal the gap between the dynamic ring member and the shaft sleeve. When such a solution is adopted, a groove can be provided on the inner arm of the dynamic ring member, and the dynamic ring seal is constructed as an annular structure and is inserted into the groove, and the dynamic ring seal fills and seals the gap between the shaft sleeve and the dynamic ring member.

[0013] Furthermore, in order to improve the sealing performance between the static ring and the gland, the structure between the static ring and the gland is optimized to improve the sealing performance. Here, one feasible option is proposed: a static ring seal is provided between the static ring and the gland. When such a solution is adopted, the inner arm of the gland is provided with a slot, and the static ring seal can be constructed in an annular shape and inserted into the slot, and the static ring seal fills and seals the gap between the gland and the static ring.

[0014] Furthermore, a corresponding connection and matching structure is also provided between the gland and the sleeve. Here, an optimization is made and a feasible option is proposed: a throttle ring structure is also provided on the sleeve, and the throttle ring structure is used to support the gland. When such a solution is adopted, the throttle ring is connected to the sleeve to fill the annular gap between the sleeve and the gland, and the coolant on the matching surface of the dynamic ring structure and the static ring can be prevented from flowing between the gland and the sleeve.

[0015] Furthermore, the shaft, the sleeve and the gland are relatively fixed. In order to avoid relative movement between the sleeve, the gland and the shaft, the matching relationship among the three is optimized and one feasible option is proposed: a transmission structure is provided on the shaft, and the transmission structure is used to press the sleeve and the gland. When such a solution is adopted, the transmission structure can be fixed on the shaft by a structure such as a pin, and is pressed against the sleeve and the gland.

[0016] Furthermore, the relative fixation between the shaft, the sleeve and the gland can be achieved in a variety of ways, and the scheme that can be adopted by the transmission structure is not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: the transmission structure includes a transmission ring, and a gasket is arranged between the transmission ring and the gland. When such a scheme is adopted, the gasket can also play a positioning role to help the gland, the sleeve and the transmission structure to match the position accurately.

[0017] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0018] The present invention optimizes the matching mode of the static ring and the dynamic ring structure, so that the relative matching surfaces of the static ring and the dynamic ring structure always keep close sealing during the rotation process, and can maintain a good tight sealing force under the action of elastic force. At the same time, coolant is introduced into the heat dissipation gap through the liquid inlet channel to help cool the friction surface of the static ring and the dynamic ring structure, thereby increasing the service life of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic cross-sectional view of a shaft seal.

[0021] In the above drawings, the meanings of the various reference numerals are as follows:

[0022] 1. Sealing structure; 2. Bushing; 3. Stationary ring; 4. Stationary ring seal; 5. Moving ring; 6. Retaining ring; 7. Moving ring seal; 8. Thrust ring; 9. Elastic structure; 10. Moving ring seat; 11. Pin; 12. Gland gasket; 13. Gland; 14. Throttle ring; 15. Gasket; 16. Pin; 17. Transmission ring. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0024] In view of the fact that the current booster pump shaft sealing structure has poor stability and is prone to reduced sealing performance after being used for a period of time, the following embodiments are optimized to overcome the defects in the prior art.

[0025] Example

[0026] like Figure 1 As shown, this embodiment provides a shaft sealing structure 1 of a booster pump, including: a sleeve 2 for sleeve-connecting a shaft, a sealing structure 1 is arranged between the sleeve 2 and the shaft; a stationary ring 3 for mounting a pressure cover 13 is arranged on the sleeve 2, and a dynamic ring structure elastically pressed against the stationary ring 3 is also arranged, and when the shaft rotates, the dynamic ring structure and the stationary ring 3 slide and fit together to achieve sealing; a heat dissipation gap is arranged on the inner side of the pressure cover 13, and the friction surface between the dynamic ring structure and the stationary ring 3 is located in the heat dissipation gap, and a liquid inlet channel connected to the heat dissipation gap is arranged on the pressure cover 13.

[0027] The shaft sealing structure 1 disclosed in this embodiment, through the elastic cooperation between the dynamic ring structure and the static ring 3, the dynamic ring structure and the static ring 3 remain in contact with each other to form a seal during the rotation of the shaft; during the rotation, cooling liquid is transported to the friction surface through the liquid inlet channel to reduce the temperature of the friction surface, thereby avoiding excessive temperature of the dynamic ring structure and the static ring 3 during the rotation.

[0028] Preferably, in order to avoid scaling of the coolant, desalted water is used as the coolant in this embodiment.

[0029] Preferably, a gland gasket 12 is provided on one end surface of the gland 13. The gland gasket 12 is located between the gland 13 and the external connector and plays a shock absorbing role.

[0030] In this embodiment, the dynamic ring structure can be constructed in a variety of forms, which are not specifically limited. This embodiment is optimized and adopts one of the feasible options: the dynamic ring structure includes a dynamic ring member 5 arranged on the sleeve 2, and a dynamic ring seat 10 is also arranged on the sleeve 2. An elastic structure 9 is arranged between the dynamic ring seat 10 and the dynamic ring member 5, and the elastic structure 9 applies an elastic force to the dynamic ring member 5 to make the dynamic ring member 5 fit and seal with the static ring 3. When such a scheme is adopted, the dynamic ring structure always keeps fit between the static ring 3, and the abutting surfaces of the two are flat surfaces. When the dynamic ring structure rotates with the shaft, the abutting surfaces always fit. In some feasible schemes, the dynamic ring structure and the static ring 3 can be made of graphite and cemented carbide respectively, so that the static ring 3 can be prevented from being damaged even when the pump jumps or collides during assembly.

[0031] Preferably, in this embodiment, the dynamic ring seat 10 is constructed in a ring shape and is sleeved on the shaft sleeve 2. The dynamic ring seat 10 can be connected and fixed to the shaft sleeve 2 by structures such as pins 11 or screws.

[0032] The elastic structure 9 used in this embodiment is not limited to a single one, and it can adopt a variety of feasible solutions. This embodiment is optimized and adopts one of the feasible options: the elastic structure 9 includes a spring, one end of the spring applies an elastic force to the dynamic ring seat 10, and the other end of the spring applies an elastic force to the dynamic ring member 5. When such a solution is adopted, the spring pushes the dynamic ring member 5 to fit the static ring 3 and maintains the fitting force of the fitting surface to form a seal.

[0033] When the dynamic ring 5 is pressed tightly, a variety of structures can be used. This embodiment is optimized and adopts one of the feasible options: a spring groove is provided on the dynamic ring seat 10, the spring is located in the spring groove, and a push ring 8 is provided between the spring and the dynamic ring 5, one side of the push ring 8 is in contact with the dynamic ring 5, and the other side of the push ring 8 is in contact with the spring. When such a scheme is adopted, the spring groove can form an annular groove along the dynamic ring seat 10 and place a spring for overall pressing support, or a plurality of empty grooves can be provided at intervals along the circumference of the dynamic ring seat 10 and springs can be provided respectively for matching pressing support.

[0034] In order to improve the precision of the push control of the dynamic ring seat 10 on the dynamic ring member 5, the structure of the dynamic ring seat 10 can be optimized and adjusted. This embodiment optimizes and adopts one of the feasible options: the dynamic ring seat 10 is provided with a clamping ring 6, which is located between the dynamic ring seat 10 and the dynamic ring member 5 and is used to fit and seal the gap between the dynamic ring member 5 and the dynamic ring seat 10. When such a solution is adopted, the number of clamping rings 6 corresponds to the number of springs, and the clamping ring 6 is a circular ring.

[0035] In order to improve the sealing effect on the shaft, this embodiment is optimized and adopts one of the feasible options; a seal is provided between the dynamic ring 5 and the shaft sleeve 2, and the seal is used to seal the gap between the dynamic ring 5 and the shaft sleeve 2. When such a solution is adopted, a groove can be provided on the inner arm of the dynamic ring 5, and the seal is constructed as an annular structure and is inserted into the groove, and the seal fills and seals the gap between the shaft sleeve 2 and the dynamic ring 5.

[0036] In order to improve the sealing performance between the stationary ring 3 and the gland 13, the structure between the stationary ring 3 and the gland 13 is optimized to improve the sealing performance. This embodiment adopts one of the feasible options: a stationary ring seal 4 is provided between the stationary ring 3 and the gland 13. When such a solution is adopted, the inner arm of the gland 13 is provided with a groove, and the stationary ring seal 4 can be constructed in an annular shape and inserted into the groove, and the stationary ring seal 4 fills and seals the gap between the gland 13 and the stationary ring 3.

[0037] Preferably, the stationary ring 3 in this embodiment is provided with a flange structure and the flange structure is located in the heat dissipation gap, and the stationary ring seal 4 is located between the pressure cover 13 and the flange structure. When the stationary ring 3 is subjected to the thrust force of the dynamic ring structure, the flange applies pressure to the stationary ring seal 4 and achieves a sealing effect.

[0038] A corresponding connection and matching structure is also provided between the gland 13 and the sleeve 2. Here, an optimization is performed and a feasible option is adopted: a throttle ring 14 structure is also provided on the sleeve 2, and the throttle ring 14 structure is used to support the gland 13. When such a solution is adopted, the throttle ring 14 is sleeved on the sleeve 2 to fill the annular gap between the sleeve 2 and the gland 13, and the coolant on the matching surface of the dynamic ring structure and the static ring 3 can be prevented from flowing between the gland 13 and the sleeve 2.

[0039] The shaft, the sleeve 2 and the gland 13 are relatively fixed. In order to avoid relative movement between the sleeve 2, the gland 13 and the shaft, the matching relationship among the three is optimized and one feasible option is proposed: a transmission structure is provided on the shaft, and the transmission structure is used to press the sleeve 2 and the gland 13. When such a solution is adopted, the transmission structure can be fixed on the shaft by a structure such as a pin 11, and is pressed and fixed with the sleeve 2, and is also pressed and fixed with the gland 13.

[0040] The relative fixation between the shaft, the sleeve 2 and the gland 13 can be achieved in a variety of ways, and the scheme that the transmission structure can adopt is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the transmission structure includes a transmission ring 17, and a gasket 15 is arranged between the transmission ring 17 and the gland 13. When such a scheme is adopted, the gasket 15 can also play a positioning role to help the gland 13, the sleeve 2 and the transmission structure to match the position accurately.

[0041] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A shaft sealing structure for a booster pump, characterized in that: include: A shaft sleeve (2) is used for sleeve-connecting a shaft, and a sealing structure (1) is arranged between the shaft sleeve (2) and the shaft; the shaft sleeve (2) is provided with a stationary ring (3) for mounting a pressure cover (13), and is also provided with a dynamic ring structure elastically pressed against the stationary ring (3); when the shaft rotates, the dynamic ring structure and the stationary ring (3) slide and fit together to achieve sealing; a heat dissipation gap is arranged on the inner side of the pressure cover (13), and the friction surface between the dynamic ring structure and the stationary ring (3) is located in the heat dissipation gap; and a liquid inlet channel connected to the heat dissipation gap is arranged on the pressure cover (13).

2. The shaft sealing structure of the booster pump according to claim 1, characterized in that: The dynamic ring structure comprises a dynamic ring component (5) arranged on a shaft sleeve (2), a dynamic ring seat (10) is also arranged on the shaft sleeve (2), an elastic structure (9) is arranged between the dynamic ring seat (10) and the dynamic ring component (5), and the elastic structure (9) applies an elastic force to the dynamic ring component (5) so that the dynamic ring component (5) and the stationary ring (3) are fitted and sealed.

3. The shaft sealing structure of the booster pump according to claim 2, characterized in that: The elastic structure (9) comprises a spring, one end of which applies an elastic force to the moving ring seat (10), and the other end of which applies an elastic force to the moving ring member (5).

4. The shaft sealing structure of the booster pump according to claim 3, characterized in that: The movable ring seat (10) is provided with a spring groove, the spring is located in the spring groove, and a push ring (8) is provided between the spring and the movable ring member (5), one side of the push ring (8) is in contact with the movable ring member (5), and the other side of the push ring (8) is in contact with the spring.

5. The shaft sealing structure of a booster pump according to any one of claims 2 to 4, characterized in that: The dynamic ring seat (10) is provided with a clamping ring (6), which is located between the dynamic ring seat (10) and the dynamic ring component (5) and is used to fit and seal the gap between the dynamic ring component (5) and the dynamic ring seat (10).

6. The shaft sealing structure of a booster pump according to any one of claims 2 to 4, characterized in that: A dynamic ring seal (7) is provided between the dynamic ring component (5) and the shaft sleeve (2), and the dynamic ring seal (7) is used to seal the gap between the dynamic ring component (5) and the shaft sleeve (2).

7. The shaft sealing structure of a booster pump according to any one of claims 1 to 4, characterized in that: A stationary ring seal (4) is provided between the stationary ring (3) and the pressure cover (13).

8. The shaft sealing structure of the booster pump according to claim 1, characterized in that: The shaft sleeve (2) is also provided with a throttling ring (14) structure, and the throttling ring (14) structure is used to support the gland (13).

9. The shaft sealing structure of the booster pump according to claim 1, characterized in that: A transmission structure is arranged on the shaft, and the transmission structure is used to tighten the shaft sleeve (2) and the pressure cover (13).

10. The shaft sealing structure of the booster pump according to claim 9, characterized in that: The transmission structure comprises a transmission ring (17), and a gasket (15) is arranged between the transmission ring (17) and the pressure cover (13).

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