Vacuum pump with anti-backflow structure

Abstract

The utility model discloses a vacuum pump with an anti-backflow structure. The vacuum pump comprises a pump body, an air inlet connector, a sealing ball and a bracket, the air inlet joint is fixed on the pump body, the interior of the air inlet joint is hollow, an inner conical surface is designed at the position close to the sealing ball, and the inner conical surface is movably attached to the elastic sealing ball; the bracket is fixed in an internal hollow channel of the air inlet connector, the bracket is hollow, a lifting part is designed at the position, facing the sealing ball, of the bracket and used for lifting the sealing ball, a first conical surface and a second conical surface are designed in the bracket, and the first conical surface is close to the sealing ball; the first conical surface diffuses towards the sealing ball, and the second conical surface diffuses in the other direction relative to the sealing ball. According to the technical scheme, the anti-backflow structure is designed, the lifting impact force of the small ball is improved when the small ball is used for sealing, and therefore the small ball can be attached to the conical surface of the air inlet connector more easily, and the anti-backflow effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to a vacuum pump with a unique anti-backflow structure, which ensures that the obstruction to the airflow is reduced during vacuuming and that the flow rate is increased during backflow, thereby increasing the lifting impact force of the sealing ball, making it easier for the ball to adhere to the conical surface of the air inlet connector. Background Technology

[0002] Vacuum pumps are a commonly used type of pump equipment, primarily used for evacuating equipment or devices. However, in the event of a power outage during evacuation, air can flow back into the evacuated container, requiring the evacuation process to restart. Current anti-backflow designs often fail to consider the impact of this structure on pumping speed. Furthermore, as described in patent CN 217873268 U, the use of lightweight seals results in high production costs and a susceptibility to defects such as out-of-roundness and weld lines, leading to poor sealing. During backflow, the backflow air is split into several streams by the anti-detachment seat, reducing the impact and lifting force of the backflow air on the seal, posing a significant risk of seal failure. Utility Model Content

[0003] The purpose of this utility model is to provide a vacuum pump with an anti-backflow structure. The technical problem to be solved is: to design an anti-backflow structure that improves the lifting force of the ball when using a small ball seal, so that the ball can more easily fit onto the conical surface of the air inlet connector, thereby ensuring the anti-backflow effect.

[0004] A vacuum pump with an anti-backflow structure includes a pump body, an inlet connector, a sealing ball, and a bracket. The inlet connector is fixed to the pump body and is hollow inside with an inner conical surface near the sealing ball. The inner conical surface is movably fitted with an elastic sealing ball, which provides a movable seal to the hollow channel inside the inlet connector. The bracket is fixed inside the hollow channel of the inlet connector and is also hollow inside. It has a lifting part facing the sealing ball to lift the sealing ball. The bracket has a first conical surface and a second conical surface inside, with the first conical surface close to the sealing ball. The first conical surface is diffused towards the sealing ball, and the second conical surface is diffused in another direction relative to the sealing ball.

[0005] The diameter of the shortest end face of the inner conical surface is smaller than the diameter of the sealing ball.

[0006] The lifting section has three parts arranged at intervals between each other.

[0007] The surface of the supporting part that contacts the sealing ball is a spherical surface, thus contacting the outer spherical surface of the sealing ball.

[0008] The first and second conical surfaces are joined together to form an X-shaped conical structure.

[0009] The elastic sealing ball is a rubber sealing ball.

[0010] The beneficial effects of this utility model are: by using a rubber sealing ball, its high elasticity can achieve a good seal under a small pressure difference; the bracket adopts an internal hollow through-hole design, which can form a first conical surface and a second conical surface. The first conical surface can reduce the obstruction of airflow during vacuuming, while the second conical surface increases the flow rate of the returning gas during backflow, thus increasing the lifting impact force on the ball and making it easier for the sealing ball to fit against the conical surface of the air inlet connector. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a vacuum pump with an anti-backflow structure;

[0012] Figure 2 This is a schematic diagram showing the inner conical surface of the air intake connector;

[0013] Figure 3 This is a schematic diagram of the bracket, showing the supporting part and the internal hollow channel;

[0014] Figure 4 This is a schematic diagram of the bracket from another angle, showing the first and second conical surfaces;

[0015] In the picture

[0016] 1. Pump body;

[0017] 2. Air intake connector; 21. Inner conical surface;

[0018] 3. Sealed sphere;

[0019] 4. Bracket; 41. Lifting part; 42. First conical surface; 43. Second conical surface. Detailed Implementation

[0020] Please refer to Figures 1 to 4 The figure shows a vacuum pump with an anti-backflow structure, which mainly consists of a pump body 1, an air inlet connector 2, a sealing ball 3, and a bracket 4. The pump body 1 is used to fix the other components, the air inlet connector 2 is used to connect the equipment that needs to be evacuated, the sealing ball 3 is used to block the air inlet connector 2, and the bracket 4 is used to support the sealing ball 3. In practical applications, the above components can be further optimized, such as by re-optimizing the design elements such as local shape, structure, and quantity, or by using existing components for equivalent replacement.

[0021] The pump body 1 in the figure can adopt the existing pump body 1 design, as long as it can be installed and fixed in place with the air inlet connector 2. The matching method between the pump body 1 and the air inlet connector 2 can also refer to the existing technology.

[0022] The air inlet connector 2 in the figure can be referenced from existing components. It is installed and fixed on the pump body 1 in the existing manner. The air inlet connector 2 has a hollow interior forming an airflow channel. In order to accommodate the rubber sealing ball 3, an inner conical surface 21 with a conical structure is designed at the position where it mates with the sealing ball 3. In this way, the inner conical surface 21 can form a movable fit with the sealing ball 3, thereby realizing the movable sealing of the hollow internal channel of the air inlet connector 2 by the elastic sealing ball 3. The inner conical surface 21 has two end faces, one above the other. The diameter of the end face located at the top position is smaller than the diameter of the sealing ball 3, thus blocking the sealing ball 3 and preventing it from escaping from the airflow channel.

[0023] The sealing ball 3 in the figure is made of an elastic material, and it can be a sealing ball 3 structure made of rubber.

[0024] The bracket 4 in the figure is fixed at the tail end of the air intake connector 2 and is located within the airflow channel of the air intake connector 2. The bracket 4 is hollow inside and features three spaced-apart support parts 41 as shown in the figure at the position where it mates with the sealing ball 3. This design supports the sealing ball 3, with each support part 41 having a spherical surface that fits well against the outer spherical surface of the sealing ball 3. The bracket 4 internally features a first conical surface 42 and a second conical surface 43. The first conical surface 42 faces the sealing ball 3, and the second conical surface 43 is adjacent to the first conical surface 42, or in another direction relative to the sealing ball 3. The first conical surface 42 diffuses towards the sealing ball 3, while the second conical surface 43 diffuses in the other direction relative to the sealing ball 3. Thus, from the longitudinal section of the bracket 4, the first conical surface 42 and the second conical surface 43 can be joined to form an X-shaped conical structure. Through the design of the first conical surface 42 and the second conical surface 43, the first conical surface 42 can reduce the obstruction to the airflow during vacuuming, while the second conical surface 43 can increase the flow rate of the returning gas during recirculation, thus increasing the lifting impact force on the small ball, making it easier for the sealing ball 3 to adhere to the conical surface of the air inlet connector 2.

[0025] The specific embodiments described above are merely illustrative of the present technical solution and are not intended to limit the present technical solution. In the description of the present technical solution, it should be noted that terms such as "upper" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only for the convenience of describing the present technical solution 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 the present technical solution.

[0026] Furthermore, in the description of this technical solution, it should be noted that, unless otherwise explicitly specified and limited, the terms "fixed" and "fitting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this technical solution according to the specific circumstances.

[0027] Although embodiments of the present technical solution have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present technical solution, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum pump with an anti-backflow structure, characterized in that: The system includes a pump body (1), an air inlet connector (2), a sealing ball (3), and a bracket (4). The air inlet connector (2) is fixed on the pump body (1). The air inlet connector (2) is hollow inside and has an inner conical surface (21) designed near the sealing ball (3). The inner conical surface (21) is movably fitted with the elastic sealing ball (3). The elastic sealing ball (3) seals the hollow channel inside the air inlet connector (2). The bracket (4) is fixed inside the hollow channel inside the air inlet connector (2). The bracket (4) is hollow inside and has a lifting part (41) designed facing the sealing ball (3) to lift the sealing ball (3). The bracket (4) has a first conical surface (42) and a second conical surface (43) designed inside. The first conical surface (42) is close to the sealing ball (3). The first conical surface (42) is diffused towards the sealing ball (3), and the second conical surface (43) is diffused in the opposite direction relative to the sealing ball (3).

2. A vacuum pump with an anti-backflow structure according to claim 1, characterized in that: The diameter of the shortest end face of the inner conical surface (21) is smaller than the diameter of the sealing ball (3).

3. A vacuum pump with an anti-backflow structure according to claim 2, characterized in that: The lifting part (41) has three parts arranged at intervals between each other.

4. A vacuum pump with an anti-backflow structure according to claim 2, characterized in that: The surface of the lifting part (41) that is in contact with the sealing ball (3) is a spherical surface, thus it is in contact with the outer spherical surface of the sealing ball (3).

5. A vacuum pump with an anti-backflow structure according to claim 1, characterized in that: The first conical surface (42) and the second conical surface (43) are spliced ​​together to form an X-shaped conical structure.

6. A vacuum pump with an anti-backflow structure according to claim 1, characterized in that: The elastic sealing ball (3) is a rubber sealing ball (3).

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