Mechanical seal lubricating structure for shaft of pump body

Abstract

The utility model belongs to the technical field of water pump, especially a kind of shaft mechanical seal lubricating structure of pump body, including the oil room upper end seat and oil room lower end cover that are sleeved and spliced in upper and lower on motor shaft, oil room upper end seat and oil room lower end cover between form the oil room filled with lubricating oil, mechanical seal static ring is arranged between motor shaft and oil room upper end seat, motor shaft is sleeved with the mechanical seal dynamic ring matched with mechanical seal static ring, annular protrusion is formed by the downward extension of the oil room upper end seat located at the outer periphery of motor shaft, mechanical seal static ring is sleeved between annular protrusion and motor shaft, the liquid level height of lubricating oil is higher than the lower end surface height of annular protrusion and mechanical seal static ring.The utility model whole structure is relatively simple, by the position of mechanical seal static ring relative to oil room by reasonable design, so that annular protrusion directly moves the assembly position of mechanical seal static ring to oil room, ensure that the lower end of mechanical seal static ring can be immersed in lubricating oil.

Description

Technical fields:

[0001] This utility model belongs to the field of water pump technology, and specifically refers to a shaft mechanical seal lubrication structure for a pump body. Background technology:

[0002] A mechanical seal mechanism for a submersible pump shaft is disclosed in a Chinese utility model patent (authorization announcement number CN201068882Y). It includes a lower end cover of a motor sleeved on the output shaft of a motor and a cover connected to the lower end cover of the motor. A mechanical seal element sleeved on the output shaft is also provided in the sealed inner oil cavity formed between the lower end cover of the motor and the cover. One to four oil-blocking ribs extending from the inner wall of the end cover to the center are provided in the inner oil cavity of the lower end cover of the motor. The oil-blocking ribs are integrally formed with the lower end cover of the motor.

[0003] In the above structure, since the lubricating oil in the sealed inner oil cavity is usually filled to about 90% of its volume, the lubricating oil level may be lower than the position of the mechanical seal stationary ring. Therefore, the oil baffle can splash the rotating lubricating oil onto the mechanical seal stationary ring. However, this structure is not very effective when the lubricating oil level is low, which may cause the mechanical seal stationary ring to be in a poor lubrication state for a long time. As a result, the mechanical seal stationary ring will dry-rub against the mechanical seal rotating ring and be damaged quickly, which will lead to the failure of the mechanical seal. Summary of the Invention:

[0004] The purpose of this utility model is to provide a shaft mechanical seal lubrication structure for a pump body. The structure is designed with a reasonable position of the mechanical seal stationary ring relative to the oil chamber, so that the annular protrusion directly moves the assembly position of the mechanical seal stationary ring down into the oil chamber, ensuring that the lower end of the mechanical seal stationary ring can be immersed in the lubricating oil.

[0005] This utility model is implemented as follows:

[0006] A shaft mechanical seal lubrication structure for a pump body includes an upper oil chamber seat and a lower oil chamber cover that are fitted and spliced ​​onto a motor shaft. An oil chamber filled with lubricating oil is formed between the upper oil chamber seat and the lower oil chamber cover. A mechanical seal stationary ring is disposed between the motor shaft and the upper oil chamber seat. A mechanical seal rotating ring that mates with the mechanical seal stationary ring is fitted on the motor shaft. An annular protrusion extends downward from the upper oil chamber seat located on the outer periphery of the motor shaft. The mechanical seal stationary ring is fitted between the annular protrusion and the motor shaft. The level of the lubricating oil is higher than the height of the annular protrusion and the lower end face of the mechanical seal stationary ring.

[0007] In the above-mentioned shaft mechanical seal lubrication structure of a pump body, the inner wall surface of the upper end seat of the oil chamber located in the oil chamber is provided with a spiral rib along the spiral direction. The spiral direction of the spiral rib is the same as the rotation direction of the motor shaft and the mechanical seal moving ring.

[0008] In the above-mentioned shaft mechanical seal lubrication structure of a pump body, there are two or more spiral ribs that are evenly distributed circumferentially.

[0009] In the above-mentioned shaft mechanical seal lubrication structure of a pump body, the upper end of the spiral rib extends upward to the outer ring side of the annular protrusion.

[0010] The outstanding advantages of this utility model compared to the prior art are:

[0011] The overall structure of this utility model is relatively simple. By reasonably designing the position of the mechanical seal stationary ring relative to the oil chamber, the annular protrusion directly moves the assembly position of the mechanical seal stationary ring down into the oil chamber, ensuring that the lower end of the mechanical seal stationary ring can be immersed in the lubricating oil, thereby effectively lubricating the mechanical seal stationary ring. Attached image description:

[0012] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0013] Figure 2 This is a structural diagram of the upper end seat of the oil chamber of this utility model.

[0014] In the diagram: 1. Motor shaft; 2. Upper end seat of oil chamber; 3. Lower end cover of oil chamber; 4. Lubricating oil; 5. Mechanical seal stationary ring; 6. Mechanical seal rotating ring; 7. Annular protrusion; 8. Spiral ribs. Detailed implementation method:

[0015] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —2:

[0016] A shaft mechanical seal lubrication structure for a pump body includes an upper oil chamber seat 2 and a lower oil chamber cover 3 fitted and spliced ​​onto a motor shaft 1. An oil chamber filled with lubricating oil 4 is formed between the upper oil chamber seat 2 and the lower oil chamber cover 3. A mechanical seal stationary ring 5 is provided between the motor shaft 1 and the upper oil chamber seat 2. A mechanical seal moving ring 6 that cooperates with the mechanical seal stationary ring 5 is fitted on the motor shaft 1. An annular protrusion 7 extends downward from the upper oil chamber seat 2 located on the outer periphery of the motor shaft 1. The mechanical seal stationary ring 5 is fitted between the annular protrusion 7 and the motor shaft 1. The liquid level of the lubricating oil 4 is higher than the height of the annular protrusion 7 and the lower end face of the mechanical seal stationary ring 5.

[0017] The overall structure of this utility model is relatively simple. By reasonably designing the position of the mechanical seal stationary ring 5 relative to the oil chamber, the annular protrusion 7 directly moves the assembly position of the mechanical seal stationary ring 5 down into the oil chamber, ensuring that the lower end of the mechanical seal stationary ring 5 can be immersed in the lubricating oil 4, thereby enabling the mechanical seal stationary ring 5 to be effectively lubricated.

[0018] Meanwhile, in order to allow the rotating lubricating oil 4 to rise upwards and further submerge the stationary ring 5 of the mechanical seal, a spiral rib 8 is provided on the inner wall of the upper end seat 2 of the oil chamber along a spiral direction. The spiral direction of the spiral rib 8 is the same as the rotation direction of the motor shaft 1 and the rotating ring 6 of the mechanical seal. That is, driven by the rotation of the motor shaft 1 and the rotating ring 6 of the mechanical seal, the lubricating oil 4 also rotates together and is lifted upwards under the guidance of the spiral rib 8.

[0019] Furthermore, in this embodiment, there are two or more spiral ribs 8, which are evenly distributed circumferentially.

[0020] In addition, in order to effectively guide the lubricating oil 4 upward to the top surface of the oil chamber, the upper end of the spiral rib 8 extends upward to the outer ring side of the annular protrusion 7.

[0021] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A shaft mechanical seal lubricating structure of a pump body, comprising an oil chamber upper end cover (2) and an oil chamber lower end cover (3) sleeved and spliced on a motor shaft (1) in an up-down direction, an oil chamber is formed between the oil chamber upper end cover (2) and the oil chamber lower end cover (3) and filled with lubricating oil (4), a mechanical seal static ring (5) is arranged between the motor shaft (1) and the oil chamber upper end cover (2), and a mechanical seal dynamic ring (6) matched with the mechanical seal static ring (5) is sleeved on the motor shaft (1), characterized in that: The upper end seat (2) of the oil chamber located on the outer periphery of the motor shaft (1) extends downward to form an annular protrusion (7). The mechanical seal stationary ring (5) is sleeved between the annular protrusion (7) and the motor shaft (1). The liquid level of the lubricating oil (4) is higher than the height of the lower end face of the annular protrusion (7) and the mechanical seal stationary ring (5). ​ 2. The mechanical seal lubrication structure for a shaft of a pump body according to claim 1, characterized in that: The inner wall of the upper end seat (2) of the oil chamber located in the oil chamber is provided with a spiral rib (8) along the spiral direction. The spiral direction of the spiral rib (8) is the same as the rotation direction of the motor shaft (1) and the mechanical seal moving ring (6).

3. The mechanical seal lubrication structure for a shaft of a pump body according to claim 2, characterized in that: The spiral ribs (8) are provided in two or more parts and are evenly distributed in the circumference.

4. The mechanical seal lubrication structure for a pump shaft according to claim 2, wherein: The upper end of the spiral rib (8) extends upward to the outer ring side of the annular protrusion (7).

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