A dry screw vacuum pump

Abstract

This invention relates to the field of vacuum pump technology, specifically disclosing a dry screw vacuum pump, including a main unit with a pair of screw rotors inside. The screw rotors are driven by a motor to rotate synchronously in opposite directions. The pump also includes a transmission assembly comprising a main synchronous pulley and two auxiliary synchronous pulleys arranged in parallel. The main synchronous pulley is driven by the motor to rotate, and the auxiliary synchronous pulleys are connected to the screw rotors. A gap exists between the two auxiliary synchronous pulleys for a synchronous belt to pass through. Protective gears are provided on the outer side of each auxiliary synchronous pulley, and the two protective gears mesh with each other. The synchronous belt has toothed protrusions on opposite sides, and simultaneously engages with the circumferential surfaces of the two auxiliary synchronous pulleys, driving them to rotate synchronously in opposite directions. This invention reduces pump chamber heat generation and vibration noise, simplifies assembly, facilitates maintenance, reduces exhaust noise, and improves user comfort.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump technology, specifically a dry screw vacuum pump. Background Technology

[0002] A screw vacuum pump is a positive displacement vacuum pump. Through the rotation of the screw rotor, the pump chamber volume gradually expands at the suction end, creating a vacuum. The gas to be pumped is drawn into the helical grooves between the screws, and then compressed and discharged from the exhaust end. It can be used under conditions free of water and oil, and is suitable for industries such as food processing. Its structure is similar to the double-corrosion-resistant coated dry screw vacuum pump disclosed in patent number CN209875467U. This type of pump structure has the following problems: First, the screw rotor is directly driven by a motor, and the heat generated by the motor accumulates on the pump body, resulting in significant overheating and loud vibration and noise. Second, the exhaust end is directly connected to the outside, making it difficult to eliminate the noise generated during exhaust. Summary of the Invention

[0003] The purpose of this invention is to provide a dry screw vacuum pump to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a dry screw vacuum pump, comprising a main unit, wherein a pair of screw rotors are disposed within the main unit, the screw rotors being driven by a motor to rotate synchronously in opposite directions, and a transmission assembly, wherein the transmission assembly comprises a main synchronous pulley and two auxiliary synchronous pulleys arranged in parallel, the main synchronous pulley being driven by a motor to rotate, the auxiliary synchronous pulleys being connected to the screw rotors, and a gap between the two auxiliary synchronous pulleys for a synchronous belt to pass through, wherein protective gears are disposed on the outer side of the auxiliary synchronous pulleys, the two protective gears meshing with each other, and the synchronous belt having toothed protrusions on opposite sides, the synchronous belt simultaneously meshing with the circumferential surfaces of the two auxiliary synchronous pulleys and driving the two auxiliary synchronous pulleys to rotate synchronously in opposite directions.

[0005] Furthermore, the main unit includes a housing and a front cover and a rear cover disposed at opposite ends of the housing, the transmission assembly is disposed on the outside of the front cover, and the main synchronous pulley and the motor are disposed on opposite sides of the front cover.

[0006] Furthermore, the motor is arranged side by side with the housing.

[0007] Additionally, the front end cover is provided with a first cover body, which covers the transmission assembly.

[0008] Furthermore, a second cover is provided on the outside of the first cover, and the second cover is provided with air holes, the positions of which correspond to the positions of the main synchronous pulley.

[0009] Furthermore, an installation cavity is provided on the inner side of the front end cover to accommodate the end of the screw rotor. An opening is provided at the bottom of the installation cavity, which extends downward to the exhaust port, and the exhaust port communicates with the interior of the housing.

[0010] In addition, an air inlet is provided at the upper end of the rear cover, and the air inlet is connected to the inside of the housing.

[0011] Furthermore, the exhaust port is connected to a silencing part, which is located below the housing.

[0012] Furthermore, the muffler includes a muffler body and connecting pipes disposed at both ends of the muffler body. One of the connecting pipes is connected to the air inlet, and the other connecting pipe extends to the bottom of the front cover and can be connected to an external object.

[0013] Furthermore, the muffler body is a hollow shell with openings at both ends, and the muffler body gradually narrows from both ends to the middle. The muffler body is provided with a dividing piece that divides the muffler body into an exhaust channel and two muffler chambers. The exhaust channel is for airflow to be discharged, and the two muffler chambers are respectively located at the two openings of the muffler body and can easily accommodate part of the airflow. The width of the muffler chamber is greater than the width of the exhaust channel.

[0014] Furthermore, a centrifugal impeller is provided on the first cover, the centrifugal impeller is covered by the second cover, and the centrifugal impeller draws in air through air holes. The centrifugal impeller is coaxially arranged with the main synchronous wheel and is driven to rotate by a motor.

[0015] The present invention has the following beneficial effects: This invention can reduce pump chamber heating and vibration noise, while also simplifying assembly and maintenance.

[0016] This invention can reduce exhaust noise and improve user comfort. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the vacuum pump in Example 1; Figure 2 for Figure 1 A partial schematic diagram, excluding the second cover; Figure 3 for Figure 1 A partial explosion diagram, excluding the wind turbine; Figure 4 for Figure 3 Schematic diagram of the layout of the intermediate synchronous belt; Figure 5 for Figure 1 A partially enlarged schematic diagram; Figure 6 for Figure 5 Enlarged schematic diagram of the front end cap; Figure 7 for Figure 5 Enlarged schematic diagram of the middle silencing section; Figure 8 for Figure 7 Enlarged schematic diagram of the main body of the silencing device. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figures 1-8 As shown, the vacuum pump in this embodiment is mainly composed of a main unit, a pair of screw rotors installed in the main unit, a motor 10 installed in the main unit and used to drive the screw rotors to rotate, a transmission assembly 20, and a silencing part 70. The transmission assembly 20 and the motor 10 work together to reduce vibration noise and reduce heat conduction from the motor 10 to the main unit, and the silencing part 70 reduces exhaust noise.

[0021] Specifically, the transmission assembly 20 includes a main synchronous pulley 21 and two auxiliary synchronous pulleys 22 arranged in parallel. The main synchronous pulley 21 is driven to rotate by the motor 10. The auxiliary synchronous pulleys 22 are connected to the screw rotor. There is a gap between the two auxiliary synchronous pulleys 22 for the synchronous belt 23 to pass through. A protective gear 24 is provided on the outer side of the auxiliary synchronous pulleys 22. The two protective gears 24 mesh with each other. The synchronous belt 23 has toothed protrusions on both sides. The synchronous belt 23 simultaneously meshes with the circumferential surfaces of the two auxiliary synchronous pulleys 22 and drives the two auxiliary synchronous pulleys 22 to rotate synchronously in opposite directions.

[0022] That is, one end of the synchronous belt 23 is sleeved on the main synchronous pulley 21, and the other end is sleeved on the outermost auxiliary synchronous pulley 22. At the same time, it passes through the gap between the two auxiliary synchronous pulleys 22 and is located below the other auxiliary synchronous pulley 22. Since the synchronous belt 23 has toothed protrusions on both sides, it can drive the two auxiliary synchronous pulleys 22 to move synchronously and in opposite directions at the same time. In addition, the outer diameter of the protective gear 24 is larger than that of the auxiliary synchronous pulley 22. Through the protective gear 24, when the synchronous belt 23 breaks, it can ensure that the two auxiliary synchronous pulleys 22 still maintain synchronous rotation, and prevent the screw rotor from colliding due to different speeds.

[0023] Furthermore, the main unit includes a housing 30 and a front cover 40 and a rear cover 50 disposed at opposite ends of the housing 30. The transmission assembly 20 is disposed on the outside of the front cover 40. The main synchronous pulley 21 and the motor 10 are disposed on opposite sides of the front cover 40. A first cover 61 is provided on the outside of the front cover 40, covering the transmission assembly 20. A second cover 62 is provided on the outside of the first cover 61. The second cover 62 is provided with air holes 63, the position of which corresponds to the position of the main synchronous pulley 21. A centrifugal fan 64 is provided on the first cover 61, which is covered by the second cover 62. The centrifugal fan 64 draws air through the air holes 63. The centrifugal fan 64 is coaxially arranged with the main synchronous pulley 21 and is driven to rotate by the motor 10. Thus, the components at the position of the first cover 61 are cooled by air blowing through the centrifugal fan 64, which draws air axially and blows air circumferentially.

[0024] Furthermore, the front cover 40 has an inner mounting cavity 41 for accommodating the end of the screw rotor. The bottom of the mounting cavity 41 has an opening 42 that extends downward to an exhaust port 43, which communicates with the interior of the housing 30. The rear cover 50 has an air inlet 51 at its upper end, which communicates with the interior of the housing 30. The exhaust port 43 is connected to a silencing part 70, which is located below the housing 30 and is concealed as much as possible to reduce its volume.

[0025] Here, the silencing body 71 is a hollow shell with openings at both ends. The silencing body 71 gradually narrows from both ends toward the middle, that is, it is generally a structure in which two shells in the shape of right trapezoids or isosceles trapezoids are symmetrically arranged.

[0026] The muffler body 71 is provided with a dividing piece 711, which divides the muffler body 71 into an exhaust channel 712 and two muffler chambers 713. The exhaust channel 712 is for airflow to be discharged. The two muffler chambers 713 are respectively open at both ends of the muffler body 71 and can easily accommodate part of the airflow. The width of the muffler chambers 713 is greater than the width of the exhaust channel 712.

[0027] The dividing member 711 is generally in an "丄" structure, that is, it is formed by two plate bodies. One plate body is arranged along the width direction of the sound-absorbing main body 71, and one end thereof contacts the inner wall of the sound-absorbing main body 71, while the other end has a spacing from the inner wall. This spacing is the width of the exhaust flow channel 712 at this position, and this plate body is located at the middle position.

[0028] The other plate body is arranged along the length direction of the sound-absorbing main body 71, and there are the same spacings between both ends thereof and the openings at both ends of the sound-absorbing main body. Thus, the spacing between this plate body and the inner wall of the sound-absorbing main body at the closer distance forms the exhaust flow channel, and the position on the other side of this plate body is the position of the sound-absorbing chamber. Most of the gas enters the sound-absorbing chamber through the large opening first, and the speed is reduced, which can reduce vibration and noise.

[0029] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A dry screw vacuum pump, comprising a main unit, wherein a pair of screw rotors are disposed within the main unit, the screw rotors being driven by a motor to rotate synchronously in opposite directions, characterized in that, It also includes a transmission assembly, which includes a main synchronous pulley and two auxiliary synchronous pulleys arranged in parallel. The main synchronous pulley is driven to rotate by a motor. The auxiliary synchronous pulleys are connected to a screw rotor. There is a gap between the two auxiliary synchronous pulleys for the synchronous belt to pass through. A protective gear is provided on the outside of the auxiliary synchronous pulleys. The two protective gears mesh with each other. The synchronous belt has toothed protrusions on both sides. The synchronous belt simultaneously meshes with the circumferential surfaces of the two auxiliary synchronous pulleys and drives the two auxiliary synchronous pulleys to rotate synchronously in opposite directions.

2. The dry screw vacuum pump according to claim 1, characterized in that: The main unit includes a housing and a front cover and a rear cover disposed at opposite ends of the housing. The transmission assembly is disposed on the outside of the front cover, and the main synchronous pulley and the motor are disposed on opposite sides of the front cover.

3. A dry screw vacuum pump according to claim 2, characterized in that: The motor is arranged side by side with the housing.

4. A dry screw vacuum pump according to claim 2, characterized in that: The front end cover is provided with a first cover body, which covers the transmission assembly inside.

5. A dry screw vacuum pump according to claim 4, characterized in that: The first cover is covered by a second cover, and the second cover is provided with air holes, the positions of which correspond to the positions of the main synchronous pulley.

6. A dry screw vacuum pump according to claim 2, characterized in that: The front cover has an inner cavity for accommodating the end of the screw rotor. The bottom of the cavity has an opening that extends downward to an exhaust port, which communicates with the interior of the housing.

7. A dry screw vacuum pump according to claim 6, characterized in that: An air inlet is provided at the upper end of the rear cover, and the air inlet is connected to the inside of the casing.

8. A dry screw vacuum pump according to claim 6, characterized in that: The exhaust port is connected to a muffler, which is located below the housing. The muffler includes a muffler body and connecting pipes connected to both ends of the muffler body. One connecting pipe is connected to the air intake, and the other connecting pipe extends to the bottom of the front cover and can be connected to an external object.

9. A dry screw vacuum pump according to claim 9, characterized in that: The muffler body is a hollow shell with openings at both ends. The muffler body gradually narrows from both ends to the middle. The muffler body is provided with a dividing piece that divides the muffler body into an exhaust channel and two muffler chambers. The exhaust channel is for airflow to be discharged. The two muffler chambers are respectively located at the two openings of the muffler body and can easily accommodate part of the airflow. The width of the muffler chamber is greater than the width of the exhaust channel.

10. A dry screw vacuum pump according to claim 5, characterized in that: The first cover is equipped with a centrifugal fan, which is covered by the second cover. The centrifugal fan draws air through an air hole. The centrifugal fan is coaxially arranged with the main synchronous wheel and is driven to rotate by a motor.

Images