Dry claw vacuum pump

Abstract

The utility model provides a kind of dry claw vacuum pump, comprising: air filter device, inlet valve, dry claw vacuum pump head, air-cooled permanent-magnet variable-frequency motor, exhaust duct, muffler;The synchronous gear in claw vacuum pump head is engaged to drive a pair of claw-shaped rotors synchronous rotation respectively, and the pair of claw-shaped rotors between, claw-shaped rotor and working cavity between respectively have gap;Air-cooled permanent-magnet variable-frequency motor drive is placed in volute centrifugal fan, after outside cold air is inhaled volute, again, it is spouted from the outlet of volute;The outlet of volute is communicated to gear box, bearing seat and the cavity by wind deflector;Air-cooled permanent-magnet variable-frequency motor is driven by frequency converter to realize the change of rotational speed;Vacuum sensor is provided on the exhaust duct for monitoring the vacuum degree of use end;Exhaust duct is also connected muffler.

Description

Technical Field

[0001] This utility model relates to a dry claw vacuum pump. Background Technology

[0002] The market demands increasingly higher standards for vacuum pumps. Due to the complexity of operating conditions, the gas entering the pump often contains numerous particles, water vapor, and other impurities, which can lead to pump seizure and corrosion. This poses a significant challenge to the stability of pump operation.

[0003] Therefore, existing vacuum pumps mainly have the following problems:

[0004] 1. Oil-lubricated vacuum pumps use oil for rotor lubrication, which can lead to the intake of impurities and deterioration of the lubricating oil; frequent oil changes result in increased maintenance costs.

[0005] 2. The motor uses a fixed-frequency design, resulting in a constant speed that cannot be adjusted according to operating conditions, leading to low efficiency. The water-cooled permanent magnet motor requires an additional supply of cooling water for cooling. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a dry claw vacuum pump that avoids pump damage caused by lubricating oil and can also reduce maintenance costs.

[0007] In order to solve the above-mentioned technical problems, this utility model provides a dry claw vacuum pump, including: an air filter device (1), an air inlet valve (2), a dry claw vacuum pump head (3), an air-cooled permanent magnet variable frequency motor (10), an exhaust pipe (4), and a silencer (5).

[0008] The synchronous gears (8) in the claw vacuum pump head (3) mesh to drive a pair of claw rotors (9) to rotate synchronously. There are gaps between the pair of claw rotors (9) and between the claw rotors (9) and the working chamber (16).

[0009] The air-cooled permanent magnet variable frequency motor (10) drives the centrifugal fan (11) placed in the volute, which draws in external cold air into the volute (12) and then sprays it out from the outlet of the volute (12); the outlet of the volute (12) is connected to the gearbox (14), bearing seat (15) and the cavity (16) through the air guide plate (13);

[0010] The air-cooled permanent magnet variable frequency motor (10) is driven by the frequency converter (17) to realize the speed change; a vacuum sensor (18) is installed on the exhaust pipe (4) to monitor the vacuum level at the user end;

[0011] A muffler (5) is also connected to the exhaust pipe (4).

[0012] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0013] 1. This utility model provides a dry claw vacuum pump where there is no direct contact between rotors or between the rotor and the working chamber, thus eliminating the need for a lubricating medium. Furthermore, both the rotor and the working chamber are coated, eliminating the need for lubricant replacement and resulting in low maintenance costs.

[0014] 2. This utility model provides a dry claw vacuum pump that uses an air-cooled permanent magnet motor. Compared to a power frequency motor, it allows for speed variation, ensuring the vacuum pump always operates at its optimal speed. Furthermore, the use of an air-cooled motor eliminates the need for an external water supply, reducing additional hardware requirements.

[0015] This utility model provides a dry claw vacuum pump with a cooling airflow channel inside the machine. The centrifugal impeller draws in cool external air and delivers it through the channel to the parts that need cooling, such as the gearbox (to cool the gear and bearing lubricating oil), the high-temperature area on the working chamber side of the housing, and the cooling housing.

[0016] This utility model provides a dry claw vacuum pump with a silencer installed in the exhaust pipe to reduce noise. No external silencer is required for noise reduction. Because the silencer is located at the bottom of the pump, the structure is compact, reducing the installation space required for the pump. The silencer has a modular design; simply opening the top cover allows for easy cleaning of the inside, making maintenance convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a dry claw vacuum pump in a preferred embodiment of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of the dry claw vacuum pump in a preferred embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the rotor in a preferred embodiment of the present invention;

[0020] Figure 4 This is an external view of the dry claw vacuum pump in a preferred embodiment of the present invention;

[0021] Figure 5 This is a side view of the dry claw vacuum pump in a preferred embodiment of the present invention. Detailed Implementation

[0022] To make the technical solution and features of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only for illustrating this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0023] refer to Figures 1-5 This embodiment provides a dry claw vacuum pump, including: an air filter device 1, an air inlet valve 2, a dry claw vacuum pump head 3, an air-cooled permanent magnet variable frequency motor 10, an exhaust pipe 4, a silencer, and a frame 6; the dry claw vacuum pump head 3 is fixed to the upper surface of the frame 6.

[0024] The synchronous gears 8 in the claw vacuum pump head 3 mesh with each other to drive a pair of claw rotors 9 to rotate synchronously. There are gaps between the pair of claw rotors 9 and between the claw rotors 9 and the working chamber 16.

[0025] The air-cooled permanent magnet variable frequency motor 10 drives the centrifugal fan 11 placed in the volute, drawing in external cold air into the volute 12 and then spraying it out from the outlet of the volute 12; the outlet of the volute 12 is connected to the gearbox 14, the bearing seat 15 and the cavity 16 through the air guide plate 13 and the gas flow channel 7.

[0026] The air-cooled permanent magnet variable frequency motor 10 is driven by the frequency converter 17 to achieve speed change; a vacuum sensor 18 is installed on the exhaust pipe 4 to monitor the vacuum level at the user end;

[0027] A muffler 5 is also connected to the exhaust pipe 4.

[0028] The aforementioned dry claw vacuum pump has no direct contact between rotors or between the rotor and the working chamber, thus eliminating the need for lubrication media. Furthermore, both the rotor and the working chamber are coated, eliminating the need for lubricant replacement and resulting in low maintenance costs. It employs an air-cooled permanent magnet motor. Compared to a fixed-frequency motor, this allows for speed variation, ensuring the vacuum pump always operates at its optimal speed. The air-cooled motor also eliminates the need for additional water supply, reducing additional hardware requirements. The entire unit features an internal cooling airflow channel. A centrifugal impeller draws in cool external air, which is then transported through the channel to the areas requiring cooling, such as cooling the gears and bearing lubricant in the gearbox, and cooling the high-temperature areas on the working chamber side of the housing. A silencer is installed in the exhaust pipe to reduce noise, eliminating the need for an external silencer. The silencer is located at the bottom of the pump, resulting in a compact structure and reducing the required installation space. The silencer has a modular design; simply opening the top cover allows for easy cleaning of the interior, simplifying maintenance.

[0029] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A dry claw vacuum pump, characterized in that... include: Air filter (1), air inlet valve (2), dry claw vacuum pump head (3), air-cooled permanent magnet variable frequency motor (10), exhaust pipe (4), silencer (5); The synchronous gears (8) in the claw vacuum pump head (3) mesh to drive a pair of claw rotors (9) to rotate synchronously. There are gaps between the pair of claw rotors (9) and between the claw rotors (9) and the working chamber (16). The air-cooled permanent magnet variable frequency motor (10) drives the centrifugal fan (11) placed in the volute, which draws in external cold air into the volute (12) and then sprays it out from the outlet of the volute (12); the outlet of the volute (12) is connected to the gearbox (14), bearing seat (15) and the cavity (16) through the air guide plate (13); The air-cooled permanent magnet variable frequency motor (10) is driven by the frequency converter (17) to realize the speed change; a vacuum sensor (18) is installed on the exhaust pipe (4) to monitor the vacuum level at the user end; A muffler (5) is also connected to the exhaust pipe (4).

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