High-air-tightness mechanical sealing device of water pump

Abstract

The utility model discloses a high-air-tightness mechanical sealing device for a water pump, which comprises a static ring and a movable ring abutted against the static ring, the static ring is provided with at least one raised sealing part, one side of the sealing part is provided with a bent lip part, the movable ring is provided with a sealing groove for accommodating the sealing part, and the static ring is provided with a sealing groove for accommodating the sealing part. One side of the sealing groove is provided with a sealing cavity for the bent lip part to do lifting compensation motion, the outer wall of the movable ring is provided with an extension part and is sleeved on the static ring, and at least one O-shaped sealing ring is arranged between the extension part and the static ring. Through the cooperation of the extension part, the sealing part and the sealing groove and the cooperation of the bent lip part and the sealing cavity, the coaxiality of the static ring and the moving ring is ensured, so that the axial movement amount is effectively reduced, the structure avoids the non-uniform abrasion of the end faces of the moving ring and the static ring caused by non-uniform displacement, the stability of the sealing performance is improved, and the sealing performance is improved through multiple sealing measures. And the sealing performance of the product is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a high airtightness mechanical seal device for water pumps. Background Technology

[0002] A mechanical seal is a component designed to prevent fluid leakage, characterized by comprising at least a pair of end faces perpendicular to the axis of rotation. These end faces remain in contact and slide relative to each other under the combined action of fluid pressure and the elastic force of a compensating mechanism (such as a spring), as well as the cooperation of auxiliary sealing elements. The spring, as a key component of the mechanical seal, applies a continuous and stable elastic force to ensure appropriate pressure is maintained between the rotating ring and the pushing ring, thereby ensuring tight contact between the sealing end faces and effectively preventing liquid or gas leakage.

[0003] In hydropower stations, water pumps are widely used as the power source for production, fire fighting, and domestic water supply, with production water demand being the largest. As the core component of the water circulation system, the stable operation of the water pump is crucial. However, the most common problem in water pump operation is seal failure. Water pumps employ various sealing methods, including sealing rings, packing, mechanical seals, soft packing seals, labyrinth seals, oil seals, and spiral seals. For high-pressure pumps, hydropower stations typically use mechanical seals. The sealing mechanism of a mechanical seal utilizes two rotating friction surfaces to achieve a seal, with an internal spring generating a preload between these surfaces. The tight fit between the friction surfaces increases water flow resistance, thus achieving a water seal.

[0004] However, traditional mechanical seal designs have inherent defects: First, they rely on two rotating friction surfaces for sealing, which makes the sealing surfaces prone to wear. Wear leads to an increase in the gap between the sealing end faces and a decrease in fluid resistance, thereby causing leakage. When the wear reaches a certain level, the sealing performance drops significantly, eventually leading to complete seal failure. Therefore, the applicant has made a beneficial design and found a way to solve the above problems. The technical solution to be introduced below is generated in this context. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of traditional mechanical seal designs and provide a product with high sealing performance, extended service life, improved reliability, and enhanced durability.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A high airtight mechanical seal device for a water pump includes a stationary ring and a rotating ring abutting against it. The stationary ring has at least one protruding sealing part, and one side of the sealing part has a bent lip. The rotating ring has a sealing groove for accommodating the sealing part, and one side of the sealing groove has a sealing cavity for the bent lip to perform lifting and lowering compensation movements. The outer wall of the rotating ring has an extension and is fitted onto the stationary ring. At least one O-ring is provided between the extension and the stationary ring.

[0008] Preferably, it further includes a bushing and a spring seat fitted on the bushing, wherein the stationary ring and the moving ring are fitted on the bushing.

[0009] Preferably, the bushing has a pressure-bearing part that supports the rotating ring, an O-ring is provided between the bushing and the pressure-bearing part, and a drive pin is provided between the bushing and the rotating ring.

[0010] Preferably, one end of the spring seat is provided with a compensation component, the compensation component includes a compensation element and a push ring placed inside the compensation element, a sealing gasket is provided between the push ring and the compensation element, the push ring is provided with a plurality of equally spaced springs along the circumference and acts on the spring seat, so that the compensation element and the stationary ring are tightly abutted against each other, and the stationary ring and the moving ring are kept under preload, and an O-ring is provided between the stationary ring and the compensation element.

[0011] Preferably, the other end of the spring seat is provided with a pressure cap, and a liftable push ring is provided below the pressure cap and inside the spring seat. The push ring is provided with a plurality of equally spaced springs along the circumference and acts on the spring seat, so that the push ring and the pressure cap abut against each other.

[0012] Preferably, the push ring is also sleeved on the bushing, and at least one O-ring is provided between the push ring and the bushing, and between the push ring and the spring seat.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] (1) By providing an extension on the outer wall of the stationary ring, the coaxiality of the stationary ring and the rotating ring is ensured, thereby effectively reducing the axial movement. This structure avoids uneven wear on the end faces of the rotating and stationary rings caused by uneven displacement, thus improving the stability of the sealing performance. At the same time, the cooperation between the sealing part and the sealing groove, as well as the cooperation between the bent lip and the sealing cavity, further restricts axial movement and provides a dual protection mechanism for the stationary and rotating rings. The above structural design significantly extends the service life of the sealing assembly and improves the reliability and durability of the mechanical seal.

[0016] (2) In this utility model, the sealing part is embedded in the sealing groove to form the first sealing measure; secondly, the flexible and elastic bent lip part cooperates with the sealing cavity, and can still maintain a stable sealing effect under the action of mechanical vibration and liquid medium pressure, forming the second sealing measure; in addition, multiple O-rings are set between the extension part and the stationary ring to further prevent the leakage of the internal liquid medium, forming the third sealing measure; the combination of multiple sealing measures effectively improves the sealing performance of the product. Even if the sealing end face of the stationary ring and the moving ring is worn too much, the above-mentioned multiple sealing measures can still significantly reduce the leakage of liquid medium and minimize economic losses. Attached Figure Description

[0017] Figure 1 This is a side cross-sectional view of a high airtightness mechanical seal device for a water pump according to the present invention.

[0018] Figure 2 This utility model Figure 1 A partially enlarged view (A) of a high-airtightness mechanical seal device for a water pump;

[0019] Figure 3 This utility model Figure 1 A partial enlarged view (B) of a high-airtightness mechanical seal device for a water pump;

[0020] The correspondence between the labels and component names in the attached figures is as follows:

[0021] Reference numerals: 1. Stationary ring; 2. Rotary ring; 3. O-ring seal; 4. Bushing; 5. Spring seat; 6. Compensating component; 7. Spring; 8. Gland; 9. Push ring; 11. Sealing part; 12. Bent lip part; 21. Sealing groove; 22. Sealing cavity; 23. Extension part; 41. Pressure bearing part; 42. Drive pin; 61. Compensating component; 62. Push ring; 63. Sealing gasket. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Reference example Figures 1 to 3 A high airtight mechanical seal device for a water pump includes a stationary ring 1 and a rotating ring 2 abutting against it. The stationary ring 1 is provided with at least one protruding sealing part 11, and a bent lip part 12 is provided on one side of the sealing part 11. The rotating ring 2 is provided with a sealing groove 21 to accommodate the sealing part 11, and a sealing cavity 22 is provided on one side of the sealing groove 21 for the bent lip part 12 to perform lifting and lowering compensation movements. The outer wall of the rotating ring 2 is provided with an extension part 23 and is sleeved on the stationary ring 1. At least one O-ring seal 3 is provided between the extension part 23 and the stationary ring 1.

[0026] By providing an extension 23 on the outer wall of the stationary ring 1, the coaxiality of the stationary ring 1 and the rotating ring 2 is ensured, thereby effectively reducing axial movement. This structure avoids uneven wear on the end faces of the rotating ring 2 and the stationary ring 1 caused by uneven displacement, improving the stability of the sealing performance. At the same time, the fit between the sealing part 11 and the sealing groove 21, and the fit between the bent lip part 12 and the sealing cavity 22, further restrict axial movement, providing a dual protection mechanism for the stationary ring 1 and the rotating ring 2. The above structural design significantly extends the service life of the sealing assembly and improves the reliability and durability of the mechanical seal. By embedding the sealing part 11 into the sealing groove 21, a first... First, a second sealing measure is formed by the flexible and elastic bent lip 12 that fits into the sealing cavity 22, maintaining a stable sealing effect under mechanical vibration and liquid medium pressure. Second, multiple O-rings 3 are provided between the extension 23 and the stationary ring 1 to further prevent leakage of the internal liquid medium, forming a third sealing measure. The combination of multiple sealing measures effectively improves the sealing performance of the product. Even if the sealing end faces of the stationary ring 1 and the moving ring 2 are worn excessively, the above-mentioned multiple sealing measures can still significantly reduce the leakage of the liquid medium and minimize economic losses.

[0027] It is worth mentioning that it also includes a bushing 4 and a spring seat 5 sleeved on the bushing 4, with a stationary ring 1 and a moving ring 2 sleeved on the bushing 4;

[0028] It is worth mentioning that the bushing 4 is provided with a pressure-bearing part 41 that supports the rotating ring 2, and an O-ring seal 3 is provided between the bushing 4 and the pressure-bearing part 41. A transmission pin 42 is provided between the bushing 4 and the rotating ring 2, and the transmission pin 42 makes the rotating ring 2 rotate together with the bushing 4.

[0029] It is worth mentioning that one end of the spring seat 5 is provided with a compensation component 6. The compensation component 6 includes a compensation element 61 and a push ring 62 placed inside the compensation element 61. A sealing gasket 63 is provided between the push ring 62 and the compensation element 61. The push ring 62 is provided with a number of equally spaced springs 7 along the circumference and acts on the spring seat 5, so that the compensation element 61 and the stationary ring 1 are tightly abutted against each other, and the stationary ring 1 and the rotating ring 2 are kept under preload. An O-ring seal 3 is provided between the stationary ring 1 and the compensation element 61. When the sealing end face of the stationary ring 1 and the rotating ring 2 has a gap due to wear, the spring 7 applies a downward force to the push ring 62. This elastic force is transmitted to the compensation element 61 through the sealing gasket 63, thereby ensuring that the stationary ring 1 and the rotating ring 2 are always in contact, effectively preventing the leakage of liquid medium. In addition, the sealing gasket 63 also prevents the liquid medium from penetrating into the area where the spring 7 is located.

[0030] It is worth mentioning that the other end of the spring seat 5 is provided with a pressure cap 8. Below the pressure cap 8 and inside the spring seat 5, there is a liftable push ring 9. The push ring 9 has several equally spaced springs 7 along the circumference and acts on the spring seat 5, so that the push ring 9 and the pressure cap 8 abut against each other. The springs 7 here apply downward pressure to the spring seat 5, and the push ring 9 increases the friction between itself and the bushing 4 through the O-ring seal 3. Therefore, the push ring 9 will apply an upward force to the bushing 4, which in turn causes the pressure-bearing part 41 to drive the moving ring 2 and the stationary ring 1 to abut tightly against each other, forming a sealing end face, thereby preventing the leakage of the internal liquid medium.

[0031] It is worth mentioning that the push ring 9 is also sleeved on the bushing 4. At least one O-ring 3 is provided between the push ring 9 and the bushing 4, and between the push ring 9 and the spring seat 5. Here, the O-ring 3 mainly plays the role of auxiliary sealing to prevent liquid medium from leaking from the gap between the gland 8 and the bushing 4.

[0032] The above design scheme can enable the product to achieve the advantages of high sealing, extended service life, improved reliability, and enhanced durability.

[0033] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A high airtightness mechanical seal device for a water pump, comprising a stationary ring (1) and a rotating ring (2) abutting against it, characterized in that: The stationary ring (1) is provided with at least one protruding sealing part (11), and a bent lip part (12) is provided on one side of the sealing part (11). The moving ring (2) is provided with a sealing groove (21) for accommodating the sealing part (11), and a sealing cavity (22) is provided on one side of the sealing groove (21) for the bent lip part (12) to perform lifting compensation activities. The outer wall of the moving ring (2) is provided with an extension part (23) and is sleeved on the stationary ring (1). At least one O-ring (3) is provided between the extension part (23) and the stationary ring (1).

2. The high airtightness mechanical seal device for water pumps according to claim 1, characterized in that: It also includes a bushing (4) and a spring seat (5) sleeved on the bushing (4), wherein the stationary ring (1) and the moving ring (2) are sleeved on the bushing (4).

3. The high airtightness mechanical seal device for water pumps according to claim 2, characterized in that: The bushing (4) is provided with a pressure-bearing part (41) that supports the moving ring (2), and an O-ring (3) is provided between the bushing (4) and the pressure-bearing part (41). A transmission pin (42) is provided between the bushing (4) and the moving ring (2).

4. The high airtightness mechanical seal device for water pumps according to claim 2, characterized in that: One end of the spring seat (5) is provided with a compensation component (6). The compensation component (6) includes a compensation element (61) and a push ring (62) placed inside the compensation element (61). A sealing gasket (63) is provided between the push ring (62) and the compensation element (61). The push ring (62) is provided with a plurality of equally spaced springs (7) along the circumference and acts on the spring seat (5) so that the compensation element (61) and the stationary ring (1) are tightly abutted against each other, so that the stationary ring (1) and the moving ring (2) maintain a preload. An O-ring (3) is provided between the stationary ring (1) and the compensation element (61).

5. The high airtightness mechanical seal device for water pumps according to claim 2, characterized in that: The other end of the spring seat (5) is provided with a pressure cap (8). Below the pressure cap (8) and inside the spring seat (5) is a liftable push ring (9). The push ring (9) has several equally spaced springs (7) along the circumference and acts on the spring seat (5) so that the push ring (9) and the pressure cap (8) abut against each other.

6. The high airtightness mechanical seal device for water pumps according to claim 5, characterized in that: The push ring (9) is also sleeved on the bushing (4), and at least one O-ring (3) is provided between the push ring (9) and the bushing (4) and between the push ring (9) and the spring seat (5).

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