Multi-stage rotary sealing industrial pump with labyrinth spacer bushes
By adopting a multi-stage rotary seal design with a labyrinth sealing pattern structure in industrial pumps, the wear and leakage of shaft seals in high pressure occasions is solved, the sealing effect and service life are improved, and the maintenance cost is reduced.
Patent Information
- Application Number
- CN202420960447.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the conveying occasions of continuous pressure or high pressure, the shaft seal is susceptible to adverse loads and wear, resulting in leakage and failure, increasing maintenance costs and inconvenience in operation.
Using a multi-stage rotary seal design with a maze sealing pattern structure, a multi-stage sealing effect is formed through the combination of first-stage sealing and lower-stage sealing. A maze sealing pattern structure is set on the inside of the sealing compartment to reduce leakage pressure and speed and reduce lower-stage The burden of sealing.
It significantly improves the sealing effect of the shaft seal, extends the service life of the pump, reduces maintenance costs, and improves the stability of the pump.
Smart Images
Figure CN222208278U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial pumps, in particular to an industrial pump with a labyrinth spacer and multi-stage rotary seal. Background Art
[0002] The stainless steel single screw pump is a single screw transport pump, which is widely used in industrial pumps. Its main working parts are the eccentric spiral screw (called the rotor) and the screw bushing with a double-line spiral surface (called the stator). Its working principle is that when the motor drives the pump shaft to rotate, the screw rotates around its own axis on the one hand, and rolls along the inner surface of the bushing on the other hand, thus forming a sealed chamber of the pump.
[0003] During the use of industrial pumps, the most frequently maintained and serviced parts are the shaft seals and bearings. For users, the simpler, more durable and easy-to-maintain structural designs are more popular, and in actual applications, they are more important than the performance requirements. In combination with the rotary seal threaded pump previously applied by our company, although it also has a multi-stage sealing structure, it is more to slow down the "waiting for maintenance" progress of the secondary seal, and the buffering effect between the two stages is not obvious in the case of high pressure output, and only in the case of low pressure output. Therefore, in general, during the use of the industrial pump shaft seal in the prior art, especially in the case of continuous pressure or relatively high pressure delivery, the shaft seal will be significantly increased in terms of adverse load and wear, and the probability of leakage and failure of the shaft seal will also increase simultaneously, which not only increases the use and maintenance cost of the pump, but also brings inconvenience to industrial operation. Utility Model Content
[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0005] Therefore, the purpose of the utility model is to provide an industrial pump with a labyrinth spacer and a multi-stage rotary seal, so as to solve the problem that during the use of the industrial pump shaft seal in the prior art proposed in the above background technology, especially in the transportation occasions with continuous pressure or relatively high pressure, the adverse load and wear of the shaft seal will increase significantly, and the probability of leakage and failure of the shaft seal will also increase simultaneously, which not only increases the use and maintenance cost of the pump, but also brings inconvenience to industrial operation.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an industrial pump with a labyrinth spacer and a multi-stage rotary seal, comprising a pump body, wherein the output end of the pump body has a main shaft extending to the main cavity, one side of the pump body has a liquid inlet connected to the main cavity, and a shaft seal assembly sleeved on the outside of the main shaft is arranged inside the pump body and adjacent to the liquid inlet. The shaft seal assembly includes a cylindrical main body, i.e., a sealing spacer, a first-stage seal is arranged at one end of the inner side of the sealing spacer and a lower-stage seal opposite to the first-stage seal is arranged at the other end, a multi-stage rotary seal is formed between the first-stage seal, the lower-stage seal and the sealing spacer, and a labyrinth seal pattern structure is arranged in the middle of the inner side of the sealing spacer and adjacent to the opposite surfaces of the first-stage seal and the lower-stage seal.
[0007] As a preferred solution of the industrial pump with a labyrinth spacer and multi-stage rotary seal described in the utility model, a bearing matching the main shaft is further provided at one end of the inner side of the pump body.
[0008] As a preferred solution of an industrial pump with a labyrinth spacer multi-stage rotary seal described in the utility model, the two ends of the inner side of the sealing spacer respectively have a primary shaft seal positioning groove corresponding to the first-stage seal, and a secondary shaft seal positioning groove corresponding to the lower-stage seal, and there is a barrier between the primary shaft seal positioning groove and the secondary shaft seal positioning groove and the labyrinth groove where the labyrinth seal pattern structure is located.
[0009] As a preferred solution of the industrial pump with a labyrinth spacer multi-stage rotary seal described in the utility model, end covers are respectively provided at both ends of the sealing spacer to seal the open ends of the primary shaft seal positioning groove and the secondary shaft seal positioning groove.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: during use, the industrial pump with a labyrinth spacer multi-stage rotary seal significantly improves the sealing effect of the shaft seal by adopting a multi-stage rotary seal composed of a first-stage seal and a lower-stage seal. At the same time, a labyrinth seal texture structure is added to the inner side of the sealing spacer used to fix the first-stage seal and the lower-stage seal. For conveying occasions with pressurized liquid inlet or relatively high pressure, the labyrinth seal texture structure can reduce the leakage pressure and leakage speed after the first-stage seal fails and before the lower-stage seal, thereby reducing the burden on the lower-stage seal, thereby extending the service life of the overall shaft seal of the pump and improving the stability of pump use. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the overall matching structure of the shaft seal of the utility model;
[0012] Figure 2 This is a schematic diagram of the internal structure of the sealing spacer of the utility model.
[0013] In the figure: 10, pump body; 20, main shaft; 30, sealing sleeve; 301, primary shaft seal positioning groove; 302, secondary shaft seal positioning groove; 303, labyrinth seal pattern structure; 304, end cover; 40, primary seal; 50, lower seal; 60, liquid inlet; 70, bearing. DETAILED DESCRIPTION
[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.
[0015] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.
[0016] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.
[0017] Figure 1-Figure 2 The schematic diagram of the whole structure of an industrial pump with a labyrinth sleeve multi-stage rotary seal of the utility model is shown. Figure 1-Figure 2 An industrial pump with a labyrinth spacer multi-stage rotary seal in this embodiment includes a pump body 10, wherein the output end of the pump body 10 has a main shaft 20 extending to the main cavity, and one side of the pump body 10 has a liquid inlet 60 connected to the main cavity. A shaft seal assembly sleeved on the outside of the main shaft 20 is arranged inside the pump body 10 and adjacent to the liquid inlet 60. The shaft seal assembly includes a cylindrical body, i.e., a sealing spacer 30. A first-stage seal 40 is arranged at one end of the inner side of the sealing spacer 30, and a lower-stage seal 50 is arranged at the other end to be matched with the first-stage seal 40. A multi-stage rotary seal is formed between the first-stage seal 40, the lower-stage seal 50 and the sealing spacer 30. A labyrinth seal pattern structure 303 is provided at the central part of the inner side of the sealing spacer 30 and adjacent to the first-stage seal 40 and the lower-stage seal 50.
[0018] A bearing 70 matching the main shaft 20 is also provided at one end of the inner side of the pump body 10. It can be understood that the cooperation between the bearing 70 here and the shaft seal assembly to which the sealing spacer 30 belongs enables the main shaft 20 and the pump body 10 to operate normally. No specific explanation is given here. It should be known that the quality of the bearing 70 is directly related to whether the shaft seal can operate well and the use and maintenance cost of the shaft seal.
[0019] The two ends of the inner side of the sealing spacer 30 are respectively provided with a primary shaft seal positioning groove 301 corresponding to the primary seal 40 and a secondary shaft seal positioning groove 302 corresponding to the lower seal 50. There is a barrier between the primary shaft seal positioning groove 301 and the secondary shaft seal positioning groove 302 and the labyrinth groove where the labyrinth seal pattern structure 303 is located. The primary shaft seal positioning groove 301 and the secondary shaft seal positioning groove 302 can be used to install and position the shaft seal rings corresponding to the primary seal 40 and the lower seal 50, making the multi-stage rotary seal more convenient to install and can be completely replaced during later maintenance, bringing convenience to maintenance personnel.
[0020] End covers 304 are respectively provided at both ends of the sealing sleeve 30 for sealing the open ends of the primary shaft seal positioning groove 301 and the secondary shaft seal positioning groove 302. It can be understood that by removing the end covers 304, the first-stage seal 40 and the lower-stage seal 50 can be conveniently placed in the primary shaft seal positioning groove 301 and the secondary shaft seal positioning groove 302. After completion, the end covers 304 are used to seal the two ends of the sealing sleeve 30 to prevent the shaft seal from slipping. In addition, the end covers 304 and the sealing sleeve 30 can be connected by threads, clamps, etc., as long as it is convenient to operate or can be well fixed, and this embodiment does not limit this.
[0021] Furthermore, the sealing spacer 30 in this embodiment should be made of metal so that the shaft seal assembly has better structural strength and service life.
[0022] Furthermore, the rotary seal in the present embodiment is not limited to the use of double-layer seals, ie, the cooperation of the first-stage and lower-stage shaft seals, but may also use multi-layer seals, depending on specific needs.
[0023] In summary, in the present embodiment, an industrial pump with a labyrinth spacer multi-stage rotary seal significantly improves the sealing effect of the shaft seal by adopting a multi-stage rotary seal composed of a first-stage seal 40 and a lower-stage seal 50 during use. At the same time, a labyrinth seal texture structure 303 is added to the inner side of the sealing spacer 30 for fixing the first-stage seal 40 and the lower-stage seal 50. For conveying occasions where the liquid inlet 60 is pressurized or the pressure is relatively high, the labyrinth seal texture structure 303 can reduce the leakage pressure and leakage rate after the first-stage seal 40 fails and before the lower-stage seal 50, thereby reducing the burden on the lower-stage seal and extending the service life of the overall shaft seal of the pump.
[0024] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An industrial pump with a labyrinth spacer multi-stage rotary seal, characterized in that: The invention comprises a pump body (10), wherein the output end of the pump body (10) has a main shaft (20) extending to the main cavity, and one side of the pump body (10) has a liquid inlet (60) connected to the main cavity. A shaft seal assembly is arranged inside the pump body (10) and adjacent to the liquid inlet (60) and is sleeved on the outside of the main shaft (20). The shaft seal assembly comprises a cylindrical main body, i.e., a sealing sleeve (30). A first-stage seal (40) is arranged at one end of the inner side of the sealing sleeve (30) and a lower-stage seal (50) is arranged at the other end to be matched with the first-stage seal (40). A multi-stage rotary seal is formed between the first-stage seal (40), the lower-stage seal (50) and the sealing sleeve (30). A labyrinth seal pattern structure (303) is arranged at the central part of the inner side of the sealing sleeve (30) and adjacent to the first-stage seal (40) and the lower-stage seal (50) opposite to the lower-stage seal (50).
2. An industrial pump with a labyrinth spacer multi-stage rotary seal according to claim 1, characterized in that: A bearing (70) matching the main shaft (20) is also provided at one end of the inner side of the pump body (10).
3. An industrial pump with a labyrinth spacer multi-stage rotary seal according to claim 1, characterized in that: The two ends of the inner side of the sealing spacer (30) are respectively provided with a primary shaft seal positioning groove (301) corresponding to the primary seal (40) and a secondary shaft seal positioning groove (302) corresponding to the secondary seal (50), and a barrier is provided between the primary shaft seal positioning groove (301) and the secondary shaft seal positioning groove (302) and the labyrinth groove where the labyrinth seal pattern structure (303) is located.
4. An industrial pump with a labyrinth spacer multi-stage rotary seal according to claim 1, characterized in that: End covers (304) are respectively provided at both ends of the sealing spacer (30) to seal the open ends of the primary shaft seal positioning groove (301) and the secondary shaft seal positioning groove (302).