Air-cooled screw vacuum pump

Abstract

The utility model provides an air-cooled screw vacuum pump, and belongs to the technical field of screw vacuum pumps. The screw vacuum pump solves the problem of how to improve the cooling effect of the screw vacuum pump and reduce the use limitation of the screw vacuum pump at the same time. The air-cooled screw vacuum pump comprises a motor and a pump body internally and rotatably connected with a screw, a driving shaft of the motor is fixedly connected with the screw, the air-cooled screw vacuum pump further comprises an outer cover provided with an air inlet and an air outlet, the pump body and the motor are connected in the outer cover, the motor is arranged close to the air inlet, and the air outlet is arranged close to the air outlet. The pump body is arranged close to the air outlet, a draught fan is connected to the inner wall of the side, provided with the air inlet, in the outer cover, and the draught fan is arranged right opposite to the motor. According to the air-cooled screw vacuum pump, the use limitation on the screw vacuum pump can be reduced while the cooling effect on the screw vacuum pump is improved.

Description

Technical Field

[0001] This utility model belongs to the field of screw vacuum pump technology, and relates to an air-cooled screw vacuum pump. Background Technology

[0002] Screw vacuum pumps are common variable displacement vacuum pumps used in modern life. They utilize a pair of screws that rotate synchronously in opposite directions at high speed within the pump casing, driven by a motor, to achieve suction and exhaust functions. To prevent overheating of the components inside the pump casing after prolonged operation (overheating can easily cause interference between components, and high temperatures themselves can negatively impact the lifespan of these components), existing technologies typically incorporate cooling structures within the screw vacuum pump. These cooling structures facilitate heat exchange between the screw vacuum pump and the external environment, displacing the heat generated during operation and thus preventing the effects of high temperatures on the pump's performance.

[0003] For example, the corrosion-resistant screw vacuum pump disclosed in Chinese Patent (authorization announcement number: CN217080785U) includes a shell and a bushing. The bushing is made of corrosion-resistant metal material. The shell is integrally formed by casting. The bushing is transversely inserted into the shell. The shell and the bushing are fixedly connected by welding. A cooling chamber is formed between the shell and the bushing.

[0004] The aforementioned prior art discloses a housing 1 and a bushing 2 installed inside the housing 1. Several components that enable the screw vacuum pump to operate are assembled inside the bushing 2, which isolates these components from the outside world. At the same time, several cooling chambers 3 are formed between the bushing 2 and the housing, spaced apart along the length of the bushing. The coolant in the cooling chamber absorbs the heat transferred to the outer wall of the bushing, thereby achieving the purpose of cooling the screw vacuum pump.

[0005] However, this cooling method has significant drawbacks: First, besides the outer casing and its internal structure, the screw vacuum pump also includes a motor located outside the casing and connected to the screw via a drive shaft. The cooling chamber only cools the components assembled inside the casing and cannot also cool the motor and the connection between the motor drive shaft and the screw. Second, cooling the screw vacuum pump through the cooling chamber requires a dedicated coolant pipeline connected to it, ensuring continuous circulation of the coolant. However, current applications of screw vacuum pumps do not guarantee the availability of such coolant pipelines, significantly limiting the application of screw vacuum pumps. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an air-cooled screw vacuum pump. The technical problem this invention aims to solve is: how to improve the cooling effect of the screw vacuum pump while reducing the limitations on its use.

[0007] The objective of this utility model can be achieved through the following technical solution: an air-cooled screw vacuum pump, comprising a motor and a pump body with a screw rotatably connected inside, the drive shaft of the motor being fixedly connected to the screw, the air-cooled screw vacuum pump further comprising an outer cover with an air inlet and an air outlet, the pump body and the motor being connected inside the outer cover, the motor being positioned near the air inlet, the pump body being positioned near the air outlet, and a fan being connected to the inner wall of the outer cover on the side with the air inlet, and the fan being positioned directly opposite the motor.

[0008] The working principle of this air-cooled screw vacuum pump is as follows: When the screw vacuum pump starts running, an electric motor installed inside the casing drives a fan. The rotating fan circulates the air inside the casing. Specifically, the fan draws air into the casing through the inlet and forces it into the cavity of the casing under pressure, creating a circulating airflow. Because the motor is located near the outlet and directly opposite the fan, the airflow entering the casing first acts on the outer wall of the motor, displacing the heat generated by the motor and preventing overheating due to prolonged operation. Then, the subsequent airflow... Under pressure, this airflow flows towards the outlet and acts on the outer wall of the pump body before being discharged outward through the outlet. This displaces the heat generated by the pump body during operation, thereby achieving the effect of cooling both the motor and the pump body. Furthermore, this method of cooling the screw vacuum pump eliminates the need for dedicated coolant pipelines to supply coolant, effectively reducing the limitations of the screw vacuum pump on application scenarios. Moreover, while ensuring the cooling effect on the screw, there is no need to arrange a dedicated cooling chamber inside the pump casing, which can make full use of the space inside the pump casing and reduce the production cost of the screw vacuum pump.

[0009] In the aforementioned air-cooled screw vacuum pump, a mounting base is connected to the pump body, and a cavity is formed between the pump body and the mounting base. The motor is connected to the mounting base, and the drive shaft and the screw both pass through the cavity. The mounting base has an air inlet communicating with the cavity and several exhaust ports. The air inlet faces the fan, and the exhaust ports face the inner wall of the outer casing. The airflow formed inside the outer casing is divided into two parts. One part, guided by the inner wall of the outer casing, passes through the motor and pump body in sequence and is discharged through the air outlet. The other part of the airflow enters the air inlet of the mounting base, which is directly opposite the fan, and flows into the cavity through the air inlet. The drive shaft of the motor and the screw installed in the pump body are connected within the cavity of the mounting base. In other words, the airflow entering the cavity through the air inlet can circulate within the cavity to cool the connection between the drive shaft and the screw. Moreover, under the pressure of the subsequent airflow, this part of the airflow is discharged from the outlet and the two airflows converge again, thereby further improving the cooling effect on the motor and pump body. It is worth mentioning that each exhaust port is specifically set towards the inner wall of the outer casing, which can effectively prevent the exhaust port from facing the fan and causing poor air intake and exhaust.

[0010] In the aforementioned air-cooled screw vacuum pump, the mounting base has a mounting portion protruding towards the fan. This mounting portion is adjacent to the air inlet and has a mounting opening. The motor is connected to the mounting portion, and the drive shaft extends into the cavity through the mounting opening. Specifically, the motor is connected to the mounting portion of the mounting base via fasteners, allowing its shaft to extend into the cavity of the mounting base through the mounting opening. This arrangement ensures that the mounting base and the air inlet are adjacent, preventing the motor from obstructing the air inlet after assembly and ensuring smoother airflow within the cavity.

[0011] In the aforementioned air-cooled screw vacuum pump, several exhaust ports are spaced apart around the outer wall of the mounting portion. This allows the airflow entering the cavity to circulate fully within the cavity, thereby ensuring sufficient cooling of the connection between the motor drive shaft and the screw inside the pump body.

[0012] In the aforementioned air-cooled screw vacuum pump, the inner wall of the outer casing is provided with air guide plates spaced around the mounting base, with one end of each air guide plate near the air outlet bent towards the outer wall of the pump body. After the airflow cools the motor and the connection between the motor drive shaft and the screw, it flows backward, but this airflow may flow along the inner wall of the outer casing, potentially leading to insufficient contact between the airflow and the outer wall of the pump body. Therefore, this application uses the baffle plates to guide the airflow towards the outer wall of the pump body, thereby improving the cooling effect on the pump body.

[0013] Compared with existing technologies, this air-cooled screw vacuum pump has the following advantages:

[0014] 1. By installing an outer cover with an air inlet and an air outlet on the motor and pump body, and installing a fan directly opposite the motor at the air inlet, the fan creates a circulating airflow inside the cover, which cools the motor and pump body in sequence and is finally discharged through the air outlet, thereby improving the cooling effect. At the same time, there is no need to arrange a complex and costly cooling water circuit, reducing the usage requirements of the screw vacuum pump.

[0015] 2. The mounting base allows the motor drive shaft and the pump body screw to pass through the cavity of the mounting base. During the circulation flow, the airflow can be split. One part flows along the inner wall of the cover, while the other part enters the cavity through the air inlet on the mounting base facing the fan. The connection between the motor drive shaft and the screw is cooled and discharged through the exhaust port around the mounting base, allowing the two airflows to converge again.

[0016] 3. By setting up the air guide plate, the re-converging airflow is guided so that the airflow can fully contact the outer wall of the pump body, thereby improving the cooling effect on the pump body. Attached Figure Description

[0017] Figure 1 This is the front view of this air-cooled screw vacuum pump.

[0018] Figure 2 yes Figure 1 A sectional view taken along the AA direction.

[0019] Figure 3 yes Figure 1 A sectional view taken along the BB direction.

[0020] Figure 4 This is a schematic diagram of the structure of the motor, pump body, and mounting base assembled into one unit.

[0021] Figure 5 This is a structural diagram of the mounting base.

[0022] In the diagram, 1 is the pump body; 11 is the screw; 2 is the mounting base; 21 is the cavity; 22 is the air inlet; 23 is the exhaust port; 24 is the mounting part; 241 is the mounting port; 3 is the motor; 31 is the drive shaft; 4 is the outer cover; 41 is the air inlet; 42 is the air outlet; 43 is the fan; and 44 is the air guide plate. 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 1-4As shown, this air-cooled screw vacuum pump includes a motor 3 and a pump body 1 with a screw 11 rotatably connected inside. The drive shaft 31 of the motor 3 and the screw 11 of the pump body 1 are fixed together by a spline to enable the motor 3 to drive the screw 11 to rotate. This air-cooled screw vacuum pump also includes a rectangular parallelepiped outer cover 4 placed horizontally. One end of the outer cover 4 has an air inlet 41 and the other end has an air outlet 42. The motor 3 and the pump body 1 are both fixed inside the outer cover 4 by bolts. The pump body 1 is located near the air outlet 42 and the motor 3 is located near the air inlet 41. Furthermore, a fan 43 is also provided inside the outer cover 4. The fan 43 is specifically screwed to the inner wall of the outer cover 4 on the side with the air inlet 41 and is located directly opposite the motor 3.

[0025] Combination Figure 5 This air-cooled screw vacuum pump also includes a mounting base 2 with an internal cavity 21. The mounting base 2 is fixed to the end of the pump body 1 facing away from the air outlet 42 by screws, and the screw 11 in the pump body 1 passes through the cavity 21. The mounting base 2 has a protruding mounting part 24 on the side surface facing the air inlet 41, and a mounting port 241 is opened on the mounting part 24. The motor 3 is fixed to the mounting part 24 by screws, and the drive shaft 31 extends into the cavity 21 through the mounting port 241 and connects with the screw 11 of the pump body 1. An air inlet 22 communicating with the cavity 21 is also opened on the surface of the mounting base 2 with the mounting part 24. The air inlet 22 is adjacent to the mounting part 24 along the width direction of the outer cover 4 and faces the fan 43. Several exhaust ports 23 are opened on the outer side wall of the mounting base 2, spaced apart along the circumference of the mounting part 24. The exhaust ports 23 are all arranged facing the inner side wall of the outer cover 4. Figure 2 and Figure 3 As shown, several air guide plates 44 are arranged circumferentially on the inner side wall of the outer cover 4 near the middle. The air guide plates 44 are all long strips and are arranged around the mounting base 2. The end of each air guide plate 44 facing the air outlet 42 is bent towards the outer side wall of the pump body 1.

[0026] Working principle: It should be noted that an additional set of electric motors for powering the fan 43 is installed inside the outer casing 4. When the motor 3 operates, it drives the screw 11 of the pump body 1 to rotate via the drive shaft 31. That is, when the screw vacuum pump is running, the motor turns on and drives the fan 43 to run. Outside air enters the outer casing 4 through the air inlet 41, forming a flowing airflow. This airflow first acts on the motor 3 to dissipate the heat generated by the motor 3. Then, as the airflow flows backward, it is divided into two parts. One part flows backward along the inner wall of the outer casing 4. One part of the airflow flows through the air inlet 22 into the cavity 21 of the mounting base 2, where it cools the connection between the drive shaft 31 of the motor 3 and the screw 11 of the pump body 1. Then, this part of the airflow is discharged outward through the exhaust port 23 and re-converges with the previous part of the airflow. Under the guidance of the air guide plate 44, the re-converged airflow acts on the outer wall of the pump body 1 to dissipate the heat generated by the operation of the pump body 1. Finally, under the pressure of the subsequent airflow, this part of the airflow is discharged outward through the air outlet 42 of the outer cover 4.

[0027] It is worth mentioning that the bottom of the outer cover 4 has an opening so that the delivery pipe can be connected to the pump body 1 through the opening. In addition, casters are installed at the bottom circumferential corners of the outer cover 4 to make it easier to move the screw vacuum pump. The casters work together to raise the cover 4, leaving a gap between the bottom of the outer cover 4 and the ground or the platform, so as to prevent the delivery pipe from being compressed by the cover 4.

[0028] 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.

[0029] Although this document frequently uses terms such as pump body 1, screw 11, mounting base 2, cavity 21, air inlet 22, exhaust port 23, mounting part 24, mounting port 241, motor 3, drive shaft 31, outer cover 4, air inlet 41, air outlet 42, fan 43, and air guide plate 44, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A wind-cooled screw vacuum pump, comprising a motor (3) and a pump body (1) internally rotatably connected to a screw (11), wherein the drive shaft (31) of the motor (3) is fixedly connected to the screw, characterized in that, This air-cooled screw vacuum pump also includes an outer casing (4) with an air inlet (41) and an air outlet (42). The pump body (1) and the motor (3) are connected inside the outer casing (4). The motor (3) is located near the air inlet (41), and the pump body (1) is located near the air outlet (42). A fan (43) is connected to the inner wall of the outer casing (4) on the side with the air inlet (41), and the fan (43) is located directly opposite the motor (3). A fan is connected to the pump body (1). Mounting base (2), a cavity (21) is formed between the pump body (1) and the mounting base (2), the motor (3) is connected to the mounting base (2), and the drive shaft (31) and the screw (11) are both inserted in the cavity (21). The mounting base (2) is provided with an air inlet (22) and several exhaust ports (23) that communicate with the cavity (21). The air inlet (22) is set towards the fan (43), and the several exhaust ports (23) are all set towards the inner wall of the outer cover (4).

2. The air-cooled screw vacuum pump according to claim 1, characterized in that, The mounting base (2) has a mounting part (24) protruding toward the fan (43). The mounting part (24) is adjacent to the air inlet (22). The mounting part (24) has a mounting port (241). The motor (3) is connected to the mounting part (24). The drive shaft (31) extends into the cavity (21) through the mounting port (241).

3. The air-cooled screw vacuum pump according to claim 2, characterized in that, Several of the exhaust ports (23) are spaced apart around the outer side wall of the mounting portion (24).

4. The air-cooled screw vacuum pump according to claim 3, characterized in that, The inner wall of the outer cover (4) is provided with air guide plates (44) spaced around the mounting base (2), and the end of each air guide plate (44) near the air outlet (42) is bent toward the outer wall of the pump body (1).

Images