Connecting structure of screw vacuum pump

Abstract

The utility model belongs to the technical field of screw vacuum pumps, and relates to a connecting structure of a screw vacuum pump, a driving screw and a driven screw driven by the driving screw are rotatably arranged in a pump body of the screw vacuum pump, the driving screw is driven by a motor, a front end cover is arranged at the front end of the pump body, and the driven screw is driven by the driving screw. The front side of the front end cover is fixedly connected with a motor end cover to form a preassembled structure, the front end cover and the motor end cover are provided with through holes coaxial with the driving screw rod, and the front end of the driving screw rod penetrates out of the through holes to form a connecting end; the motor comprises a machine shell, an outer stator and an inner rotor, the inner rotor is arranged at the connecting end of the driving screw in a sleeving mode and is in transmission connection with the connecting end of the driving screw, and the machine shell is connected to the motor end cover through a fastener. The connecting structure of the screw vacuum pump has the advantages of being simple in structure, convenient to install and good in concentricity.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw vacuum pumps and relates to a connection structure of a screw vacuum pump. Background Art

[0002] The screw vacuum pump is a vacuum device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump body to produce suction and exhaust. The screw vacuum pump includes a pump body and a motor, and the motor drives the active screw in the pair of screws. Its connection structure is that the end of the motor is fixedly connected to the end of the pump body through a connecting piece, and the motor shaft of the motor is connected to the active screw through a coupling.

[0003] The existing connection structure is very difficult to install for many reasons: the mass of the motor is too large, and during installation, it is necessary to ensure the concentricity of the motor end cover and the front end cover, as well as the concentricity of the motor shaft and the active screw. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a connection structure for a screw vacuum pump, which has the advantages of simple structure, convenient installation and good concentricity.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A connection structure of a screw vacuum pump, wherein a driving screw and a driven screw driven by the driving screw are rotatably arranged in a pump body of the screw vacuum pump, the driving screw is driven by a motor, a front end cover is arranged at the front end of the pump body, the front side of the front end cover is fixedly connected to the motor end cover to form a pre-installed structure, a through hole coaxial with the driving screw is arranged on the front end cover and the motor end cover, the front end of the driving screw passes through the through hole to form a connection end; the motor comprises a casing, an outer stator and an inner rotor, the inner rotor is sleeved on the connection end of the driving screw and is transmission-connected thereto, and the casing is connected to the motor end cover by a fastener.

[0007] In the above-mentioned connection structure of a screw vacuum pump, the motor end cover and the front end cover have the same external contour, and the motor end cover and the front end cover are connected to form an integral structure.

[0008] In the above-mentioned connection structure of a screw vacuum pump, a pair of bearing seats are arranged on the front end cover, the front end of the bearing seat protrudes from the front end surface of the front end cover, and the motor end cover is arranged outside the bearing seat; bearings that cooperate with the driving screw and the driven screw are respectively arranged in the bearing seat.

[0009] In the above-mentioned connection structure of a screw vacuum pump, a sealed cavity is formed between the motor end cover and the front end cover, lubricating oil is poured into the sealed cavity, and an observation mirror for observing the sealed cavity is arranged on the upper side of the motor end cover.

[0010] In the above-mentioned connection structure of a screw vacuum pump, a flange mounting surface is provided on one side of the front end surface of the motor end cover, and a mounting flange is provided at the rear end of the casing. The mounting flange is adapted to the flange mounting surface and is fastened and connected by fasteners; further, the mounting flange and the flange mounting surface are centered by a stop structure.

[0011] In the above-mentioned connection structure of a screw vacuum pump, the inner rotor is connected to the connecting end of the active screw through a spline transmission; further, a shoulder that cooperates with the rear end of the inner rotor is provided on the connecting end.

[0012] In the above-mentioned connection structure of a screw vacuum pump, a rear end cover is provided at the rear end of the pump body, and a gear box is fixedly connected to the rear side of the rear end cover. A transmission gear set is provided in the gear box, and the active screw and the driven screw are connected through the transmission gear set; the transmission gear set includes a pair of meshing gears, and the gears have the same number of teeth and are respectively mounted on the active screw and the driven screw.

[0013] In the above-mentioned connection structure of a screw vacuum pump, a mounting plate is provided at the rear end of the motor, the motor is located on one side of the mounting plate, and a control component of the screw vacuum pump is provided on the other side of the mounting plate; the control component includes a circuit board, a circuit breaker, a control switch, a pressure switch, etc.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a connection structure of a screw vacuum pump, which connects the motor end cover and the front end cover into a pre-installed structure, and connects the motor housing to the motor end cover. When installing the motor, it is no longer necessary to consider the concentricity of the motor end cover and the front end cover, and only part of the structure of the original motor needs to be installed, which reduces the weight of the components to be installed. At the same time, the utility model also eliminates the motor shaft, and directly connects the inner rotor and the active screw rod, which can further simplify the installation and ensure the concentricity. Therefore, the connection structure provided by the utility model has the advantages of simple structure, convenient installation, and good concentricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure numerals: 1. Pump body; 2. Driving screw; 3. Motor; 4. Front cover; 5. Motor end cover; 6. Casing; 7. Outer stator; 8. Inner rotor; 9. Bearing seat; 10. Observation mirror; 11. Mounting flange; 12. Spline; 13. Rear cover; 14. Gear box; 15. Transmission gear set; 16. Mounting plate; 17. Control assembly. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings. Figure 1-2 :

[0020] A connection structure of a screw vacuum pump, wherein a driving screw 2 and a driven screw driven by the driving screw 2 are rotatably arranged in a pump body 1 of the screw vacuum pump (the arrangement of the driving screw 2 and the driven screw is the same as in the prior art, and the driven screw is not drawn in the attached figure), the driving screw 2 is driven by a motor 3, a front end cover 4 is arranged at the front end of the pump body 1, the front side of the front end cover 4 is fixedly connected to the motor end cover 5 to form a pre-installed structure, the front end cover 4 and the motor end cover 5 are provided with a through hole coaxial with the driving screw 2, the front end of the driving screw 2 passes through the through hole and forms a connecting end; the motor 3 includes a casing 6, an outer stator 7 and an inner rotor 8, the inner rotor 8 is sleeved on the connecting end of the driving screw 2 and is transmission-connected thereto, and the casing 6 is connected to the motor end cover 5 by a fastener.

[0021] The connection structure provided in this embodiment is connected in the following manner: first, the motor end cover 5 is installed to the front end cover 4 of the pump body 1 to form an integral pre-installed structure and the through holes of the two are coaxial. After installation, the connecting end of the active screw 2 extends out of the through hole to be connected. Then, the motor 3 including the housing 6, the outer stator 7 and the inner rotor 8 is installed by connecting the housing 6 to the motor end cover 5. When the motor 3 is installed, the inner rotor 8 is fitted onto the connecting end of the active screw 2 to form a transmission structure. When working, the motor 3 is started, the inner rotor 8 rotates, and the active screw 2 connected to the inner rotor 8 rotates synchronously. The active screw 2 drives the driven screw to rotate through the synchronous transmission gear. The air is sucked into the inner cavity of the pump body 1 from the air inlet of the pump body 1, and is discharged from the exhaust port of the pump body 1 after being compressed and pressurized by the rotating active screw 2 and the driven screw.

[0022] Preferably, the motor end cover 5 and the front end cover 4 have the same external contour, and the motor end cover 5 and the front end cover 4 are connected to form an integral structure. In this embodiment, it means that the mounting end of the motor end cover 5 and the mounting end of the front end cover 4 have the same external contour.

[0023] A pair of bearing seats 9 are arranged on the front end cover 4, the front end of the bearing seat 9 protrudes from the front end surface of the front end cover 4, and the motor end cover 5 is covered outside the bearing seat 9; bearings supporting the active screw 2 and the driven screw are respectively arranged in the bearing seat 9.

[0024] In order to ensure the stable operation of the rotating parts, a sealed cavity is formed between the motor end cover 5 and the front end cover 4 , and lubricating oil is poured into the sealed cavity. An observation mirror 10 for observing the sealed cavity is arranged on the upper side of the motor end cover 5 .

[0025] In this embodiment, the connection structure between the motor end cover 5 and the casing 6 is: a flange mounting surface is provided on one side of the front end surface of the motor end cover 5, and a mounting flange 11 is provided at the rear end of the casing 6, and the mounting flange 11 is adapted to the flange mounting surface and is fastened and connected by fasteners; further, the mounting flange 11 and the flange mounting surface are centered by a stop structure.

[0026] In this embodiment, the inner rotor 8 is connected to the connecting end of the active screw 2 through a spline 12; further, a shoulder that cooperates with the rear end of the inner rotor 8 is provided on the connecting end.

[0027] In this embodiment, the transmission structure of the active screw 2 and the driven screw is: a rear end cover 13 is provided at the rear end of the pump body 1, and a gear box 14 is fixedly connected to the rear side of the rear end cover 13, and a transmission gear set 15 is provided in the gear box 14, and the active screw 2 and the driven screw are connected through the transmission gear set 15; the transmission gear set 15 includes a pair of meshing gears, which have the same number of teeth and are respectively mounted on the active screw 2 and the driven screw.

[0028] In order to facilitate the control of the screw vacuum pump, a mounting plate 16 is provided at the rear end of the motor 3, the motor 3 is located on one side of the mounting plate 16, and a control component 17 of the screw vacuum pump is provided on the other side of the mounting plate 16; the control component 17 includes a circuit board, a circuit breaker, a control switch, a pressure switch, etc.

[0029] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure of a screw vacuum pump, wherein a driving screw (2) and a driven screw driven by the driving screw (2) are rotatably arranged in a pump body (1) of the screw vacuum pump, wherein the driving screw (2) is driven by a motor (3), and wherein: The front end of the pump body (1) is provided with a front cover (4), the front side of the front cover (4) is fixedly connected to the motor end cover (5) to form a pre-assembled structure, the front cover (4) and the motor end cover (5) are provided with a through hole coaxial with the active screw (2), the front end of the active screw (2) passes through the through hole and forms a connecting end; the motor (3) comprises a casing (6), an outer stator (7) and an inner rotor (8), the inner rotor (8) is sleeved on the connecting end of the active screw (2) and is transmission-connected thereto, and the casing (6) is connected to the motor end cover (5) via a fastener.

2. The connection structure of a screw vacuum pump according to claim 1, characterized in that: The motor end cover (5) and the front end cover (4) have the same external profile, and the motor end cover (5) and the front end cover (4) are connected to form an integral structure.

3. The connection structure of a screw vacuum pump according to claim 2, characterized in that: A pair of bearing seats (9) are arranged on the front end cover (4), the front ends of the bearing seats (9) protrude from the front end surface of the front end cover (4), and the motor end cover (5) is arranged outside the bearing seats (9).

4. The connection structure of a screw vacuum pump according to claim 3, characterized in that: A sealed cavity is formed between the motor end cover (5) and the front end cover (4), the sealed cavity is filled with lubricating oil, and an observation mirror (10) for observing the sealed cavity is provided on the upper side of the motor end cover (5).

5. The connection structure of a screw vacuum pump according to claim 2, characterized in that: A flange mounting surface is provided on one side of the front end surface of the motor end cover (5), and a mounting flange (11) is provided at the rear end of the housing (6). The mounting flange (11) is matched with the flange mounting surface and is fastened and connected by fasteners.

6. The connection structure of a screw vacuum pump according to claim 1, characterized in that: The inner rotor (8) is connected to the connecting end of the active screw (2) via a spline (12).

7. The connection structure of a screw vacuum pump according to claim 1, characterized in that: A rear end cover (13) is provided at the rear end of the pump body (1), a gear box (14) is fixedly connected to the rear side of the rear end cover (13), a transmission gear set (15) is provided in the gear box (14), and the active screw (2) and the driven screw are connected in transmission via the transmission gear set (15).

8. The connection structure of a screw vacuum pump according to claim 1, characterized in that: A mounting plate (16) is provided at the rear end of the motor (3), the motor (3) is located on one side of the mounting plate (16), and a control component (17) of a screw vacuum pump is provided on the other side of the mounting plate (16).

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