A pump shaft connection structure of a vacuum pump

Abstract

The utility model provides a kind of pump shaft connecting structure of vacuum pump, belong to vacuum pump technical field.It solves the problem of inconvenient installation of existing pump shaft connecting structure.The pump shaft connecting structure of this vacuum pump, vacuum pump includes pump body and motor, motor includes the motor shaft being arranged in the pump body in one end, the pump shaft is rotatably connected in the pump body, the gear is sleeved in one end of the pump shaft, the pump shaft connecting structure of this includes expansion sleeve and fastener, expansion sleeve is sleeved in the end of pump shaft and the outside wall of expansion sleeve and gear inner wall abut, motor shaft end portion is formed in the form of disc along the circumferential direction and extends outward and forms mounting portion, mounting portion and gear abut and are fixed by fastener, and form the space for giving birth to between mounting portion and pump shaft.This pump shaft connecting structure of vacuum pump improves installation convenience.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum pump technology and relates to a pump shaft connection structure for a vacuum pump. Background Technology

[0002] When a vacuum pump is running, the pump shaft needs to be connected to the motor shaft to supply driving force to the pump shaft. Since the vacuum pump rotates at a relatively high speed during use, a stable connection between the vacuum pump shaft and the motor shaft is required. Most existing vacuum pumps adopt a dual-pump-shaft rotation structure. Therefore, after the motor shaft is connected to one of the pump shafts, that pump shaft is usually fitted with a driving gear, and the other pump shaft is fitted with a driven gear. The rotation of one pump shaft drives the rotation of the other pump shaft, thereby achieving synchronous rotation of the two pump shafts.

[0003] Existing vacuum pumps connect the pump shaft and motor shaft in ways such as those described in Chinese patent application [Authorization Announcement No.: CN215486584U], which discloses a Roots vacuum pump. This pump includes a pump body and a permanent magnet synchronous motor. The pump body has a rotatably mounted pump shaft, one end of which extends out of the pump body, passes into the permanent magnet synchronous motor, and is connected relative to the rotor shaft of the permanent magnet synchronous motor. The rotor shaft of the permanent magnet synchronous motor coaxially drives the pump shaft to rotate within the pump body. The pump body and the housing of the permanent magnet synchronous motor are relatively sealed and fixedly connected. A coupling structure is provided between the rotor shaft of the permanent magnet synchronous motor and the pump shaft to prevent relative displacement between them. The coupling structure includes the rotor shaft of the permanent magnet synchronous motor. The front end of the shaft has an axially arranged assembly groove. The extended end of the pump shaft is inserted into the assembly groove of the rotor shaft of the permanent magnet synchronous motor. A coupling limiting component is provided between the pump shaft and the rotor shaft of the permanent magnet synchronous motor. The coupling limiting component includes bolts and key blocks. The key block is embedded in the extended end of the pump shaft. A keyway is provided on the groove wall of the assembly groove of the rotor shaft of the permanent magnet synchronous motor. The key block at the extended end of the pump shaft is fitted onto the keyway of the rotor shaft of the permanent magnet synchronous motor, thereby limiting the circumferential relative positioning of the pump shaft and the rotor shaft of the permanent magnet synchronous motor. The bolt is used for the axial connection of the pump shaft and the rotor shaft of the permanent magnet synchronous motor, thereby limiting the axial relative positioning of the pump shaft and the rotor shaft of the permanent magnet synchronous motor.

[0004] The above structure achieves the connection between the pump shaft and the rotor shaft through the cooperation of keyways and key blocks. The keyway is opened inside the rotor shaft, and the key block needs to be inserted into the keyway to achieve circumferential relative positioning. The axial connection is achieved by bolts set inside the rotor shaft. The overall connection method is relatively complicated, and the bolts need to be set inside the rotor shaft, which makes installation inconvenient. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a pump shaft connection structure for a vacuum pump. The technical problem to be solved by this utility model is: how to solve the problem of inconvenient installation of the existing pump shaft connection structure.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A pump shaft connection structure for a vacuum pump, the vacuum pump including a pump body and a motor, the motor including a motor shaft with one end disposed in the pump body, the pump shaft being rotatably connected in the pump body, and a gear being sleeved on one end of the pump shaft, characterized in that the pump shaft connection structure includes an expansion sleeve and fasteners, the expansion sleeve being sleeved on the end of the pump shaft with the outer side wall of the expansion sleeve abutting against the inner wall of the gear, the end of the motor shaft extending outward in a circumferential direction to form a disc-shaped mounting part, the mounting part abutting against the gear and being fixedly connected by fasteners, and a clearance space being formed between the mounting part and the pump shaft.

[0008] The pump shaft, rotatably connected within the pump body, is connected to the motor shaft on the motor. A gear is fitted onto one end of the pump shaft, and the gear is connected to the pump shaft via an expansion sleeve. The end of the motor shaft extends outward circumferentially to form a mounting part, which abuts against the gear and is connected to the gear via fasteners. This achieves the connection between the motor shaft and the gear. The driving force of the motor shaft is directly transmitted to the gear, which then drives the pump shaft to rotate, thus ensuring the stable rotation of the dual-pump-shaft structure. To avoid mutual interference between the connection between the gear and the motor shaft, and between the gear and the pump shaft, a clearance space is formed between the mounting part and the pump shaft, preventing them from contacting each other after installation. This ensures stable transmission of driving force. Furthermore, the cooperation of the expansion sleeve and fasteners achieves a quick and stable connection. Since all mounting components are located outside the pump shaft and motor shaft, the fasteners and expansion sleeves are easy to install, improving the ease of installation of the pump shaft connection structure.

[0009] In the above-mentioned vacuum pump shaft connection structure, the end face of the mounting part is provided with a countersunk hole, the gear protrudes to form a positioning part that is embedded in the countersunk hole and is in the shape of an annular shape, and the fastener is provided outside the positioning part.

[0010] The countersunk hole and positioning part can achieve axial and circumferential pre-positioning between the gear and the motor shaft before the fastener is positioned, which facilitates the connection and fixation of the fastener and also improves the stability of the connection between the gear and the motor shaft.

[0011] In the above-mentioned vacuum pump shaft connection structure, the inner sidewall of the gear is recessed to form an installation groove, the expansion sleeve is embedded in the installation groove, the positioning part is located outside the expansion sleeve, and there is a gap between the expansion sleeve and the motor shaft.

[0012] The installation slot design eliminates the need to modify the pump shaft; instead, it directly modifies the smaller gear, resulting in lower modification costs. Furthermore, after installation, the gap between the expansion sleeve and the motor shaft ensures that the pump shaft, connected to the gear via the expansion sleeve, does not directly contact the motor shaft after connection, thus guaranteeing the stability of the drive force transmission.

[0013] In the pump shaft connection structure of the vacuum pump described above, the outer wall of the positioning part is in contact with the side wall of the countersunk hole.

[0014] This structure improves the circumferential positioning stability of the gear and the mounting part, thereby ensuring stable rotation of the pump shaft after connection.

[0015] In the above-mentioned pump shaft connection structure of the vacuum pump, the end face of the mounting part is flat and the mounting part is pressed against the gear by fasteners, and there is a gap between the end face of the positioning part and the bottom wall of the countersunk hole.

[0016] When the fastener presses the mounting part onto the gear, there is a gap between the end face of the positioning part and the bottom wall of the countersunk hole. This ensures that the embedding of the positioning part does not affect the fastener's fixation, but also reduces the machining accuracy. This makes installation convenient while reducing machining accuracy.

[0017] In the above-mentioned pump shaft connection structure of the vacuum pump, the motor includes a motor housing, which is fixed to the pump body by bolts. The pump body has a mounting plate, one end of the motor shaft passes through the mounting plate, and a bearing is provided between the mounting plate and the motor shaft.

[0018] By installing a mounting plate on the pump body, the mounting plate supports the end of the motor shaft, making the mounting part more stable and thus improving the stability of the pump shaft connection structure.

[0019] Compared with existing technologies, the pump shaft connection structure of this vacuum pump has the following advantages: through the cooperation of expansion sleeves and fasteners, a fast and stable connection is achieved. All mounting components are located outside the pump shaft and motor shaft, so the fasteners and expansion sleeves are easy to install, improving the ease of installation of the pump shaft connection structure. Attached Figure Description

[0020] Figure 1 This is a partial sectional view of the assembled version of this utility model.

[0021] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0022] In the diagram, 1 is the pump body; 11 is the mounting plate; 2 is the motor; 21 is the motor shaft; 21a is the mounting part; 21b is the countersunk hole; 22 is the motor housing; 3 is the pump shaft; 4 is the gear; 41 is the positioning part; 42 is the mounting groove; 5 is the expansion sleeve; 6 is the fastener; 7 is the clearance space; 8 is the spacing; 9 is the gap; 10 is the bolt; and 101 is the bearing. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, the vacuum pump has a pump shaft connection structure. The vacuum pump includes a pump body 1 and a motor 2. The motor 2 includes a motor shaft 21 with one end set inside the pump body 1. A pump shaft 3 is rotatably connected inside the pump body 1. A gear 4 is sleeved on one end of the pump shaft 3.

[0025] Specifically, such as Figure 1 and Figure 2 As shown, the pump shaft connection structure includes an expansion sleeve 5 and a fastener 6. The expansion sleeve 5 is fitted onto the end of the pump shaft 3 and the outer wall of the expansion sleeve 5 abuts against the inner wall of the gear 4. The end of the motor shaft 21 extends outward in the circumferential direction to form a disc-shaped mounting part 21a. The mounting part 21a abuts against the gear 4 and is fixedly connected by the fastener 6. A clearance space 7 is formed between the mounting part 21a and the pump shaft 3.

[0026] like Figure 2 As shown, the end face of the mounting part 21a is provided with a countersunk hole 21b. A positioning part 41, which is annular and embedded in the countersunk hole 21b, is protruded on the gear 4. The fastener 6 is provided outside the positioning part 41. The outer side wall of the positioning part 41 is in contact with the side wall of the countersunk hole 21b. The end face of the mounting part 21a is flat and the mounting part 21a is pressed against the gear 4 by the fastener 6. There is a gap 9 between the end face of the positioning part 41 and the bottom wall of the countersunk hole 21b.

[0027] like Figure 1 and Figure 2 As shown, the inner sidewall of the gear 4 is recessed to form a mounting groove 42, the expansion sleeve 5 is embedded in the mounting groove 42, the positioning part 41 is located outside the expansion sleeve 5, and there is a gap 8 between the expansion sleeve 5 and the motor shaft 21.

[0028] like Figure 1 As shown, the motor 2 includes a motor housing 22, which is fixed to the pump body 1 by bolts 10. The pump body 1 has a mounting plate 11, and one end of the motor shaft 21 passes through the mounting plate 11. A bearing 101 is provided between the mounting plate 11 and the motor shaft 21.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pump shaft connection structure for a vacuum pump, the vacuum pump comprising a pump body (1) and a motor (2), the motor (2) comprising a motor shaft (21) with one end disposed within the pump body (1), a pump shaft (3) rotatably connected within the pump body (1), and a gear (4) sleeved on one end of the pump shaft (3), characterized in that, The pump shaft connection structure includes an expansion sleeve (5) and a fastener (6). The expansion sleeve (5) is fitted onto the end of the pump shaft (3) and the outer wall of the expansion sleeve (5) abuts against the inner wall of the gear (4). The end of the motor shaft (21) extends outward in the circumferential direction to form a disc-shaped mounting part (21a). The mounting part (21a) abuts against the gear (4) and is fixedly connected by the fastener (6). A clearance space (7) is formed between the mounting part (21a) and the pump shaft (3).

2. The pump shaft connection structure of the vacuum pump according to claim 1, characterized in that, The mounting part (21a) has a countersunk hole (21b) on its end face. The gear (4) has a protrusion forming a positioning part (41) that is embedded in the countersunk hole (21b) and is in the shape of an annular shape. The fastener (6) is provided outside the positioning part (41).

3. The pump shaft connection structure of the vacuum pump according to claim 2, characterized in that, The gear (4) has a recessed inner wall to form a mounting groove (42), the expansion sleeve (5) is embedded in the mounting groove (42), the positioning part (41) is located outside the expansion sleeve (5), and there is a gap (8) between the expansion sleeve (5) and the motor shaft (21).

4. The pump shaft connection structure of the vacuum pump according to claim 2 or 3, characterized in that, The outer wall of the positioning part (41) is in contact with the side wall of the countersunk hole (21b).

5. The pump shaft connection structure of the vacuum pump according to claim 2 or 3, characterized in that, The end face of the mounting part (21a) is flat and the mounting part (21a) is pressed against the gear (4) by fasteners (6), and there is a gap (9) between the end face of the positioning part (41) and the bottom wall of the countersunk hole (21b).

6. The pump shaft connection structure of the vacuum pump according to claim 1, 2, or 3, characterized in that, The motor (2) includes a motor housing (22), which is fixed to the pump body (1) by bolts (10). The pump body (1) has a mounting plate (11), and one end of the motor shaft (21) passes through the mounting plate (11). A bearing (101) is provided between the mounting plate (11) and the motor shaft (21).

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