Pressure self-balancing vacuum pump sealing structure

Abstract

The utility model discloses a pressure self -balancing formula's vacuum pump sealing structure belongs to vacuum pump technical field, including the pump body shell, the one side of pump body shell is provided with transmission assembly, is provided with drive assembly in the one side of transmission assembly, is provided with the rotating shaft in the other side of transmission assembly, is provided with the sealing bearing in the one end outside of rotating shaft, is seted up oil mist filter device on the first pressure lead -through of pump body shell and located one side, the utility model discloses, through the pressure difference change of system self, change the pressure in the lubricating cavity, has realized the "self -balancing " of system, the actual contact ratio pressure between lip seal and rotating shaft no longer grows with system pressure linearly, but maintains at a lower and stable level, and the balance structure is integrated in the pump body sealing seat inside, need not external power source, and the structure is simple and compact, and the work is reliable.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a pressure self-balancing vacuum pump sealing structure. Background Technology

[0002] The market demands increasingly higher performance and reliability from vacuum pumps, posing a significant challenge to traditional dynamic seals under high-pressure and high-differential-pressure conditions. Taking lip seals as an example, the medium pressure acts on the back of the sealing lip, pressing it tightly against the rotating shaft.

[0003] In existing technologies, measures such as improving the wear resistance of materials, optimizing the lip design, or increasing external air supply are often used to alleviate the above problems. However, these methods only treat the symptoms and not the root cause. Under extreme high pressure or frequent pressure fluctuations, the effect is limited, and the sealing life is still not long.

[0004] Existing structural technologies require the addition of a complete set of modules, including air source, detection, and control, to control the air supply to the sealing cavity, thereby achieving dynamic pressure balance at both ends and reducing wear.

[0005] The above technical conditions also have drawbacks: the above optimization method requires the addition of an external air source, sensors and new circuit control components, which greatly increases the cost. At the same time, the external air supply to balance the pressure at both ends of the seal will also affect the vacuum performance of the pump itself.

[0006] Based on this, the present invention designs a pressure self-balancing vacuum pump sealing structure to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a pressure self-balancing vacuum pump sealing structure to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a pressure self-balancing vacuum pump sealing structure, comprising a pump body shell, a transmission assembly on one side of the pump body shell, a drive assembly on one side of the transmission assembly, a rotating shaft on the other side of the transmission assembly, a sealing bearing on the outer side of one end of the rotating shaft, a first pressure-inducing channel on the rotating shaft, an oil mist filter on the pump body shell located on one side of the first pressure-inducing channel, a venting ring on one end of the first pressure-inducing channel located on the outer side of the rotating shaft, a lip seal on the pump body shell located on one side of the venting ring, a pump body cavity inside the pump body shell, a pump body sealing seat on the transmission assembly located on the outer side of the rotating shaft, an impurity filter on one side of the pump body sealing seat, and a second pressure-inducing channel on the pump body sealing seat.

[0009] By adopting the above technical solution, the pressure inside the lubrication chamber is changed by the pressure difference of the system itself, thus achieving the self-balancing of the system.

[0010] Preferably, a lubrication chamber is also provided on one side of the pump body housing, and the lip seal includes two sets of sealing rings, one set facing the lubrication chamber and the other set facing the inner cavity of the pump body.

[0011] By adopting the above technical solution, the lubrication chamber and the pump body cavity are sealed.

[0012] Preferably, the venting ring is connected to the first pressure channel.

[0013] By adopting the above technical solution, air pressure balance exchange can be achieved.

[0014] Preferably, the impurity filtration device is located at the port of the second pressure channel.

[0015] By adopting the above technical solution, it is mainly used to filter impurities in the pump body cavity and prevent them from entering the second pressure channel.

[0016] Preferably, the oil mist filter is located at the port of the first pressure channel on the rotating shaft.

[0017] By adopting the above technical solution, it is mainly used to filter oil particles in the lubrication cavity and prevent them from entering the first pressure channel.

[0018] In summary, this application has the following beneficial technical effects: 1. By changing the pressure inside the lubrication chamber through the pressure difference of the system itself, the system achieves "self-balancing". The actual contact pressure between the lip seal and the rotating shaft no longer increases linearly with the system pressure, but is maintained at a low and stable level. The balancing structure is integrated inside the pump body seal seat, requiring no external power source. The structure is simple and compact, and the operation is reliable.

[0019] 2. Due to the significant reduction in contact pressure, friction, wear, and heat generation are effectively controlled, thereby extending the service life of the lip seal by several times. At the same time, the frictional torque is reduced, which lowers the energy consumption of the drive equipment. It is suitable for high pressure and high pressure differential conditions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the external structure of this embodiment; Figure 2 for Figure 1 A schematic cross-sectional view of the structure at point AA; Figure 3 This is a schematic cross-sectional view of the structure in this embodiment; Figure 4 for Figure 2 Enlarged view of the structure at point B; Figure 5 for Figure 3 Enlarged view of the structure at point C.

[0022] The attached diagram lists the components represented by each number as follows: 1. Pump housing; 2. Transmission assembly; 3. Drive assembly; 4. Rotary shaft; 5. Sealed bearing; 6. Oil mist filter structure; 7. Vent ring; 8. Lip seal; 9. First pressure channel; 10. Pump body cavity; 11. Pump body sealing seat; 12. Impurity filter device; 13. Second pressure channel. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0025] A pressure self-balancing vacuum pump sealing structure includes a pump body shell 1, a transmission assembly 2 on one side of the pump body shell 1, a drive assembly 3 on one side of the transmission assembly 2, a rotating shaft 4 on the other side of the transmission assembly 2, a sealing bearing 5 on the outer side of one end of the rotating shaft 4, a first pressure-inducing channel 9 on the rotating shaft 4, an oil mist filter 6 on the pump body shell 1 located on one side of the first pressure-inducing channel 9, a venting ring 7 at one end of the first pressure-inducing channel 9 located on the outer side of the rotating shaft 4, a lip seal 8 on the pump body shell 1 located on one side of the venting ring 7, a pump body inner cavity 10 inside the pump body shell 1, a pump body sealing seat 11 on the transmission assembly 2 located on the outer side of the rotating shaft 4, an impurity filter 12 on one side of the pump body sealing seat 11 for filtering ingress impurities, and a second pressure-inducing channel 13 on the pump body sealing seat 11.

[0026] Furthermore, a lubrication chamber is provided on one side inside the pump housing 1, and lubricating oil is provided inside the lubrication chamber. The lip seal 8 includes two sets of sealing rings, one set facing the lubrication chamber and the other set facing the pump housing 10, so as to achieve the sealing between the lubrication chamber and the pump housing 10.

[0027] Furthermore, the ventilation ring 7 is connected to the first pressure channel 9 to achieve pressure balance exchange.

[0028] Furthermore, the impurity filtration device 12 is located at the port of the second pressure channel 13, and it is mainly used to filter impurities in the pump body cavity to prevent them from entering the second pressure channel 13.

[0029] Furthermore, the oil mist filter 6 is located at the port of the first pressure channel 9 on the rotating shaft 4. It is mainly used to filter oil particles in the lubrication chamber and prevent them from entering the first pressure channel 9.

[0030] The implementation principle of this embodiment is as follows: When the vacuum pump is running, as the vacuum level of the pump body cavity 10 changes, because the first pressure channel 9 and the venting ring 7 connect the pump body cavity 10 and the lubrication cavity, the gas in the lubrication cavity, due to the pressure difference of the channel, flows through the impurity filter device 12 and then through the first pressure channel 9 to the pump body cavity 10, changing the pressure in the lubrication cavity. This achieves self-balancing adjustment of the pressure in the three chambers at the lip seal 8: the pump body cavity 10, the lubrication cavity, and the intermediate cavity (the space between the two lip seals 8). This reduces the pressure difference on both sides of the two sealing rings, thereby reducing the wear of the sealing rings and extending their service life. At the same time, this balancing method does not interact with the external gas source and will not affect the vacuum level and performance inside the pump body.

[0031] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure self-balancing vacuum pump sealing structure, comprising a pump body shell (1), characterized in that: A transmission assembly (2) is provided on one side of the pump body housing (1), a drive assembly (3) is provided on one side of the transmission assembly (2), a rotating shaft (4) is provided on the other side of the transmission assembly (2), a sealed bearing (5) is provided on the outer side of one end of the rotating shaft (4), a first pressure channel (9) is provided on the rotating shaft (4), an oil mist filter (6) is provided on the pump body housing (1) and on one side of the first pressure channel (9), a venting ring (7) is provided at one end of the first pressure channel (9) and on the outer side of the rotating shaft (4), a lip seal (8) is provided on the pump body housing (1) and on one side of the venting ring (7), a pump body cavity (10) is provided inside the pump body housing (1), a pump body sealing seat (11) is provided on the transmission assembly (2) and on the outer side of the rotating shaft (4), an impurity filter (12) is provided on one side of the pump body sealing seat (11), and a second pressure channel (13) is provided on the pump body sealing seat (11).

2. The pressure self-balancing vacuum pump sealing structure according to claim 1, characterized in that: The pump body housing (1) also has a lubrication chamber on one side inside. The lip seal (8) includes two sets of sealing rings, one set facing the lubrication chamber and the other set facing the pump body cavity (10).

3. The pressure self-balancing vacuum pump sealing structure according to claim 1, characterized in that: The ventilation ring (7) is connected to the first pressure channel (9).

4. The pressure self-balancing vacuum pump sealing structure according to claim 1, characterized in that: The impurity filtration device (12) is located at the port of the second pressure channel (13).

5. The pressure self-balancing vacuum pump sealing structure according to claim 1, characterized in that: The oil mist filter (6) is located at the port of the first pressure channel (9) on the rotating shaft (4).

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