Mechanical shaft seal self-flushing circulating cooling structure and compressor comprising same
By using a self-flushing circulating cooling structure for mechanical shaft seals, the problems of poor cooling effect and impurity accumulation in mechanical shaft seal compressors are solved. This achieves continuous cooling and lubrication, prevents wear on the sealing surface, reduces costs, and improves the operational flexibility and reliability of the equipment.
Patent Information
- Application Number
- CN202520480835.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Existing mechanical shaft seal compressors have poor cooling performance and suffer from impurity accumulation and wear on the sealing surface due to frequent start-stop cycles, which increases costs and reduces equipment reliability.
A self-flushing circulating cooling structure for mechanical shaft seals was designed, including components such as an oil distributor, cooling pipes, adapters, U-shaped pipes, mechanical seal sealing chamber, and return oil pipe. The coolant is discharged from top to bottom and then back up through the U-shaped pipes to achieve continuous cooling and lubrication, prevent the accumulation of solid particles, and provide lubrication when the machine is stopped, thereby reducing costs.
It improves cooling efficiency, prevents wear on sealing surfaces, reduces equipment costs, and enhances the operational flexibility and reliability of the equipment.
Smart Images
Figure CN223923303U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a self-flushing circulating cooling structure for a mechanical shaft seal and a compressor containing the same. Background Technology
[0002] The core of a mechanical shaft seal is a pair of end faces perpendicular to the axis of rotation. These end faces are kept in contact and slide relative to each other under the action of fluid pressure and the elasticity (or magnetic force) of the compensation mechanism to achieve a sealing effect. For this friction seal, cooling and lubrication flushing are necessary.
[0003] Currently, vertical flow-limited self-flushing and horizontal flow-limited reverse flushing are the two most common flushing methods in mechanical shaft seal compressors. Vertical flushing uses top-inlet and bottom-outlet, where hot oil usually rises and cold oil sinks, often resulting in poor cooling. Bottom-inlet and top-outlet flushing requires a check valve to prevent dry friction due to insufficient seal lubrication during machine start-up and shutdown. Furthermore, an improper layout increases the overall cost of the unit. While horizontal flushing solves some problems, it creates new risks. Impurities from seal wear accumulate at the bottom of the sealing cavity, potentially causing abnormal wear or damage to the sealing surface. Utility Model Content
[0004] The purpose of this invention is to overcome the above-mentioned shortcomings of existing materials. This invention provides a mechanical shaft seal self-flushing circulating cooling structure and a compressor containing the same.
[0005] This utility model is achieved through the following technical solution:
[0006] A self-flushing circulating cooling structure for a mechanical shaft seal includes an oil distributor, cooling pipes, an adapter, a mechanical seal cavity, and a U-shaped pipe. The adapter is located at the top of the mechanical seal cavity. The two ends of the cooling pipe are connected to the oil distributor and the adapter, respectively, and are in communication with the oil distributor and the adapter. The two ends of the U-shaped pipe are connected to the adapter and the mechanical seal cavity, respectively, and are in communication with the adapter and the mechanical seal cavity, so that the coolant in the oil distributor flows sequentially through the cooling pipes, the adapter, and the U-shaped pipe into the mechanical seal cavity.
[0007] Furthermore, the mechanical shaft seal self-flushing circulating cooling structure also includes an oil return pipe and a pump body. The two ends of the oil return pipe are respectively connected to the top of the mechanical seal sealing cavity and the pump body, and are connected to the air intake end of the mechanical seal sealing cavity and the pump body.
[0008] Furthermore, the mechanical shaft seal self-flushing circulating cooling structure also includes an oil-gas tank, which is connected to and communicates with the pump body and the oil distributor.
[0009] Furthermore, the mechanical shaft seal self-flushing circulating cooling structure also includes a bearing oil inlet pipe, the two ends of which are respectively connected to the oil distributor and the pump body and are in communication with the oil distributor and the pump body.
[0010] A compressor comprising a mechanical shaft seal self-flushing circulating cooling structure as described above.
[0011] The beneficial effects of this utility model are as follows:
[0012] This invention relates to a self-flushing circulating cooling structure for a mechanical shaft seal and a compressor incorporating it. Coolant from the distributor flows sequentially through cooling pipes, an adapter, and a U-shaped pipe into the mechanical seal cavity. It then flows from the top to the bottom of the mechanical seal cavity via the U-shaped pipe, and finally enters the mechanical seal cavity from the bottom, allowing the coolant to circulate more effectively between the seal cavity and the pump. This provides continuous cooling and lubrication, helps prevent the accumulation of solid particles on the sealing surface, and ensures that even when the entire system is stopped, the coolant remains in the seal cavity by its own weight, providing timely lubrication for the next startup and preventing the sealing material from degrading due to overheating from dry friction. Simultaneously, it improves operational flexibility and reduces costs. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural diagram of the self-flushing circulating cooling structure of the mechanical shaft seal according to an embodiment of the present invention.
[0014] Figure 2 This is a front view schematic diagram of the self-flushing circulating cooling structure of the mechanical shaft seal according to an embodiment of the present invention.
[0015] Figure 3 This is a right-side view of the mechanical shaft seal self-flushing circulating cooling structure according to an embodiment of the present invention.
[0016] Explanation of reference numerals in the attached figures:
[0017] Oil separator 1
[0018] Cooling pipe 2
[0019] Adapter 3
[0020] U-shaped pipe 4
[0021] Mechanical seal cavity 5
[0022] Return pipe 6
[0023] Pump body 7
[0024] Bearing oil inlet pipe 8 Detailed Implementation
[0025] The following description of the embodiments is with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.
[0026] This embodiment discloses a compressor that includes a mechanical shaft seal self-flushing circulating cooling structure. For example... Figure 1 , Figure 2 and Figure 3 As shown, the self-flushing circulating cooling structure of the mechanical shaft seal includes an oil distributor 1, a cooling pipe 2, an adapter 3, a mechanical seal sealing cavity 5, and a U-shaped pipe 4. The adapter 3 is located at the top of the mechanical seal sealing cavity 5. The two ends of the cooling pipe 2 are connected to the oil distributor 1 and the adapter 3 respectively and are in communication with the oil distributor 1 and the adapter 3. The two ends of the U-shaped pipe 4 are connected to the bottom of the adapter 3 and the mechanical seal sealing cavity 5 respectively and are in communication with the adapter 3 and the mechanical seal sealing cavity 5, so that the coolant in the oil distributor 1 flows into the mechanical seal sealing cavity 5 in sequence through the cooling pipe 2, the adapter 3, and the U-shaped pipe 4.
[0027] The two ends of cooling pipe 2 are connected to one end of distributor 1 and one end of adapter 3, respectively. Adapter 3 is located at the top of mechanical seal cavity 5. The two ends of U-shaped pipe 4 are connected to adapter 3 and the bottom of mechanical seal cavity 5, respectively. Coolant in distributor 1 flows into mechanical seal cavity 5 through cooling pipe 2, adapter 3 and U-shaped pipe 4 for flushing. Coolant flows from the top to the bottom of mechanical seal cavity 5 through U-shaped pipe 4 and then enters mechanical seal cavity 5 from the bottom for flushing. This flushing process allows the coolant to flow from top to bottom and then back up, carrying away the heat generated by friction on the sealing surface and providing necessary lubrication. The heated coolant remains at the top due to density changes and is discharged upwards under pressure differential. It can more effectively circulate fluid between the sealed cavity and the pump, providing continuous cooling and lubrication. It also helps prevent the accumulation of solid particles on the sealing surface. Moreover, when the entire system is stopped, the coolant remains in the sealed cavity by its own weight, providing timely lubrication for the next startup and preventing the sealing material from degrading due to overheating from dry friction. At the same time, it improves operational flexibility and reduces costs.
[0028] The adapter 3 has an inlet and an outlet for connection and fixation. The U-shaped pipe 4 extends into the mechanical seal cavity 5, with the two ends of the branch pipe 4 located at the top and bottom of the mechanical seal cavity 5, respectively. Utilizing the U-shaped principle of the U-shaped pipe 4, the flushing coolant is discharged from top to bottom and then back up, which more effectively circulates the fluid between the sealing cavity and the pump, providing continuous cooling and lubrication. It also helps prevent the accumulation of solid particles on the sealing surface. Furthermore, when the entire system is stopped, the coolant remains in the sealing cavity by its own weight, providing timely lubrication for the next startup and preventing the sealing material from degrading due to overheating from dry friction. Simultaneously, the integrated oil distribution design only requires connecting a single pipe to the distributor 1 to achieve overall circulation, improving operational flexibility and reducing costs.
[0029] The self-flushing circulating cooling structure of the mechanical shaft seal also includes a return oil pipe 6 and a pump body 7. The two ends of the return oil pipe 6 are connected to the top of the mechanical seal sealing cavity 5 and the pump body 7, respectively, and are connected to the suction end of the mechanical seal sealing cavity 5 and the pump body 7. The low-temperature coolant enters the mechanical seal sealing cavity 5, carries away the heat generated by the friction of the sealing surface, and provides necessary lubrication. The heated coolant, due to the change in density, always stays at the top and is discharged upward under the action of pressure difference, flowing through the return oil pipe 6 to the suction end of the pump body 7.
[0030] The mechanical shaft seal self-flushing circulating cooling structure also includes an oil-gas tank, which is connected to and communicates with the pump body 7 and the oil distributor 1. The coolant is discharged through the exhaust port of the pump body 7 and flows to the oil-gas tank, where it is filtered and cooled before returning to the oil distributor 1, completing the self-flushing circulating cooling process.
[0031] The mechanical shaft seal self-flushing circulating cooling structure also includes a bearing oil inlet pipe 8, with its two ends connected to the oil distributor 1 and the pump body 7, respectively, and communicating with both. The circulating oil in the oil distributor 1 flows into the pump body 7 through the bearing oil inlet pipe 8, ensuring the normal operation of the bearings in the pump body 7.
[0032] The return oil pipe 6 is connected at both ends to the mechanical seal sealing cavity 5 and the pump body 7 via compression fittings. The bearing inlet oil pipe 8 is connected at both ends to the pump body 7 and the oil distributor 1 via compression fittings. The cooling pipe 2 is connected to the flow-limiting orifice of the oil distributor 1 via compression fittings. The U-shaped pipe 4 is connected to the mechanical seal sealing cavity 5 via compression fittings. In the self-flushing circulating cooling structure of the mechanical shaft seal, adjustments can be made as needed. If a lower mechanical seal temperature is required in the future, the size of the oil distributor 1 and the specifications of the flow-limiting orifice can be adjusted and controlled to solve problems such as impurity accumulation, excessive wear, and reduced mechanical seal life due to frequent start-stop cycles.
[0033] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A mechanical shaft seal self-flushing circulating cooling structure, characterized in that, The mechanical shaft seal self-flushing circulating cooling structure comprises an oil separator, a cooling pipeline, an adapter, a mechanical seal sealing cavity and a U-shaped pipeline, the adapter is located at the top of the mechanical seal sealing cavity, two ends of the cooling pipeline are connected to and communicate with the oil separator and the adapter, two ends of the U-shaped pipeline are connected to and communicate with the adapter and the mechanical seal sealing cavity, so that the cooling liquid in the oil separator flows into the mechanical seal sealing cavity through the cooling pipeline, the adapter and the U-shaped pipeline in sequence.
2. The mechanical shaft seal self-flushing circulation cooling structure of claim 1, wherein, The mechanical shaft seal self-flushing circulating cooling structure further comprises an oil return pipeline and a pump body, two ends of the oil return pipeline are connected to and communicate with the top end of the mechanical seal sealing cavity and the suction end of the pump body.
3. The mechanical shaft seal self-flushing circulation cooling structure of claim 2, wherein, The mechanical shaft seal self-flushing circulating cooling structure further comprises an oil-gas bucket, the oil-gas bucket is connected to and communicates with the pump body and the oil separator.
4. The mechanical shaft seal self-flushing circulation cooling structure of claim 2, wherein, The mechanical shaft seal self-flushing circulating cooling structure further comprises a bearing oil inlet pipeline, two ends of the bearing oil inlet pipeline are connected to and communicate with the oil separator and the pump body.
5. A compressor characterized by, The mechanical shaft seal self-flushing circulating cooling structure comprises the mechanical shaft seal self-flushing circulating cooling structure according to any one of claims 1-4.