Vacuum pump

Abstract

The vacuum pump comprises a pump body assembly, a screw assembly and a driving assembly, and the pump body assembly comprises a ventilation opening and a vacuum opening; the screw assembly comprises a driving screw and a driven screw which are arranged in the pump body assembly in parallel, and the driving assembly is used for driving the driving screw to rotate; a plurality of groups of first spiral rotating teeth which are rotationally and symmetrically distributed are arranged on the driving screw along the axis of the driving screw; a group of first spiral tooth grooves are formed between every two adjacent groups of first spiral rotating teeth; a plurality of groups of second spiral rotating teeth which are rotationally and symmetrically distributed are arranged on the driven screw along the axis of the driven screw, and a group of second spiral tooth grooves are formed between every two adjacent groups of second spiral rotating teeth; on the same cross section of the driving screw rod and the driven screw rod, the arc-shaped outline of the first spiral rotating tooth is the same as that of the second spiral tooth groove, and the arc-shaped outline of the second spiral rotating tooth is the same as that of the first spiral tooth groove, so that the driving screw rod and the driven screw rod are in meshed connection. The suction efficiency of the screw vacuum pump can be improved.

Description

Technical Field

[0001] This application relates to the technical field of vacuum pumps, and specifically to a vacuum pump. Background Technology

[0002] A screw vacuum pump is a mechanical device that uses the meshing motion of two or more screw rotors to create a vacuum within the pump body. The working principle of a screw vacuum pump is that during operation, the screw rotors continuously draw in and compress gas, thereby expelling the gas at the pump outlet to achieve a vacuum.

[0003] Existing screw vacuum pumps have screw rotors with symmetrical or asymmetrical extended toothed wheels. These screw rotors rotate by meshing with each other through the extended toothed wheels. The rotation of the screw rotor drives the air to move, and the air is gradually compressed by passing through the extended toothed wheels. The difference in the degree of gas compression on both sides of the extended toothed wheels is large, resulting in low suction efficiency of the screw vacuum pump. Utility Model Content

[0004] This application provides a vacuum pump that can improve the suction efficiency of a screw vacuum pump.

[0005] The vacuum pump structure provided in this application adopts the following technical solution:

[0006] A vacuum pump structure, comprising:

[0007] A pump body assembly includes a vent and a vacuum port; both the vent and the vacuum port are connected to the interior of the pump body assembly.

[0008] A screw assembly is disposed inside the pump body assembly. The screw assembly includes a driving screw and a driven screw arranged parallel to each other within the pump body assembly. The driving screw has multiple sets of first helical teeth arranged rotationally symmetrically along its axis. A set of first helical tooth grooves is provided between two adjacent sets of first helical teeth. The driven screw has multiple sets of second helical teeth arranged rotationally symmetrically along its axis. A set of second helical tooth grooves is provided between two adjacent sets of second helical teeth. On the same cross-section of the driving screw and the driven screw, the arcuate profile of the first helical teeth is the same as the arcuate profile of the second helical tooth grooves, and the arcuate profile of the second helical teeth is the same as the arcuate profile of the first helical tooth grooves, so that the driving screw and the driven screw are meshed and connected.

[0009] A drive assembly for driving the active screw to rotate.

[0010] Optionally, on the same cross-section, the contours of the first helical tooth, the first helical tooth groove, the second helical tooth, and the second helical tooth groove are all circular arcs.

[0011] Optionally, on the same cross section, adjacent first helical teeth and first helical grooves are distributed symmetrically with respect to the first connection point, and adjacent second helical teeth and second helical grooves are distributed symmetrically with respect to the second connection point.

[0012] The first connection point is located at the connection position of the adjacent first helical tooth and the first helical tooth groove, and the second connection point is located at the connection position of the adjacent second helical tooth and the second helical tooth groove.

[0013] Optionally, the active screw is provided with four sets of first helical teeth; on the same cross section, the four sets of first helical teeth are arranged in a cross shape;

[0014] The driven screw is provided with four sets of second helical teeth; on the same cross section, the four sets of second helical teeth are arranged in a cross shape.

[0015] Optionally, on the same cross-section, the arcuate values ​​of the arcuate profiles of the first helical tooth, the first helical tooth groove, the second helical tooth, and the second helical tooth groove are all in the range of 45 degrees to 135 degrees.

[0016] Optionally, both the driving screw and the driven screw are equal-pitch screws, and the pitch of the driving screw and the pitch of the driven screw are the same.

[0017] Optionally, the pump body assembly includes a housing, a first flange, and a second flange; the first flange and the second flange are disposed opposite to each other on both sides of the housing; the driving screw and the driven screw are both rotatably disposed between the first flange and the second flange.

[0018] Optionally, the pump body assembly includes two vents; the two vents are positioned at the midpoint of both sides of the housing, opposite to the driving screw and the driven screw.

[0019] The vacuum port is located on the end face of the first flange.

[0020] Optionally, the drive assembly includes a drive mechanism, the drive end of which is connected to the driving screw; the screw assembly includes a transmission element, and the driving screw is connected to the driven screw through the transmission element.

[0021] Optionally, the drive assembly further includes a mounting plate, a transmission gear, a transmission rod, a driving pulley, a driven pulley, and a timing belt;

[0022] The mounting plate is disposed on the side of the cover; the transmission rod passes through the mounting plate; the gear side of the transmission gear is connected to the drive end of the drive mechanism; the center of the transmission gear is connected to one end of the transmission rod; the other end of the transmission rod is connected to the center of the driving wheel; the driving wheel is connected to the driven wheel through the synchronous belt; the driven wheel is rotatably connected to one end of the driving screw near the second flange.

[0023] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0024] When air needs to be introduced into the container cavity, the drive assembly drives the two screws to rotate in opposite directions. During their complementary rotation, the driving and driven screws allow air to flow towards the first flange. The gas enters the pump assembly through the vent. The first helical teeth and the second helical grooves, as well as the second helical teeth and the first helical grooves, gradually come into contact, causing the gas to be compressed along the first and second helical grooves towards the first flange. Thus, the gas enters the container cavity through the vacuum port. When a vacuum needs to be evacuated from the container cavity, the drive assembly drives the driving and driven screws to rotate in opposite directions. During their complementary rotation, the driving and driven screws allow air to flow towards the second flange. The gas inside the container cavity is connected to the first and second helical grooves through the vacuum port. As the driving and driven screws rotate, the first and second helical grooves gradually separate, while adjacent first and second helical grooves gradually approach and mesh. The gas at the exhaust port is compressed towards the second flange guided by the first and second helical grooves. During the rotation of the screw assembly, the gas with exhaust pressure in the container cavity is discharged sequentially through the vacuum port to the vent, thereby realizing the function of evacuating the container cavity. The close contact between the first and second helical grooves, as well as between the second and first helical grooves, improves the suction efficiency of the vacuum pump. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of a vacuum pump disclosed in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a vacuum pump screw assembly disclosed in an embodiment of this application;

[0028] Figure 3This is a cross-sectional view along the length of a vacuum pump disclosed in an embodiment of this application;

[0029] Figure 4 This is a cross-sectional view along the width direction of a vacuum pump disclosed in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Pump body assembly; 11. Cover; 12. Vent; 13. Vacuum port; 14. First flange; 15. Second flange; 2. Screw assembly; 21. Driving screw; 211. First helical tooth; 212. First helical tooth groove; 213. First connection point; 22. Driven screw; 221. Second helical tooth; 222. Second helical tooth groove; 223. Second connection point; 23. Transmission component; 3. Drive assembly; 31. Mounting plate; 32. Transmission gear; 33. Transmission rod; 34. Driving pulley; 35. Driven pulley; 36. Synchronous belt. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] This application provides a vacuum pump that can improve the suction efficiency of a screw vacuum pump.

[0034] To enable those skilled in the art to better understand the present invention, 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 a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] Existing screw vacuum pumps have screw rotors with symmetrical or asymmetrical extended toothed wheels. These screw rotors rotate by meshing with each other through the extended toothed wheels. The rotation of the screw rotor drives the air to move, and the air is gradually compressed by passing through the extended toothed wheels. The difference in the degree of gas compression on both sides of the extended toothed wheels is large, resulting in low suction efficiency of the screw vacuum pump.

[0037] To address the aforementioned problems, this application provides a vacuum pump; please refer to [link / reference]. Figure 1 and Figure 2 This is one embodiment of a vacuum pump in this application, including a pump body assembly 1, a screw assembly 2, and a drive assembly 3. The screw assembly 2 and the drive assembly 3 are disposed on the pump body assembly 1. The drive assembly 3 is used to drive the screw assembly 2 to rotate so that the screw assembly 2 compresses air, thereby realizing the vacuum pump's function of drawing a vacuum.

[0038] The pump body assembly 1 includes a housing 11, a first flange 14, and a second flange 15. The first flange 14 and the second flange 15 are disposed opposite each other on both sides of the housing 11 and are fixedly connected to the housing 11. The screw assembly 2 includes a driving screw 21 and a driven screw 22 disposed parallel to each other within the pump body assembly 1. Both the driving screw 21 and the driven screw 22 are rotatably disposed between the first flange 14 and the second flange 15. The driving screw 21 and the driven screw 22 are meshed together. The drive assembly 3 drives the driving screw 21 to rotate, and the rotation of the driving screw 21 drives the driven screw 22 to rotate synchronously.

[0039] In this embodiment, the vent 12 is disposed on the cover 11, and the cover 11 communicates with the atmospheric environment through the vent 12. The vacuum port 13 is disposed on the end face of the first flange 14 and is used to communicate with the external container cavity. The vacuum port 13 is disposed corresponding to the center line of the axial distance between the driving screw 21 and the driven screw 22. Both the vent 12 and the vacuum port 13 are connected to the interior of the pump body assembly 1.

[0040] Two vents 12 are provided, positioned at the midpoint of both sides of the housing 11 relative to the driving screw 21 and driven screw 22. This allows air to enter the housing 11 through the vents 12 on both sides, ensuring uniform airflow from all directions and preventing excessive local airflow that could cause pump vibration or performance degradation. Furthermore, it helps reduce the radial force generated by gas intake, maintaining pump stability and preventing eccentricity due to excessive air intake on one side. The drive assembly 3 drives the driving screw 21 and driven screw 22 to mesh and rotate, allowing air to enter the housing 11 through the vents 12, then through the vacuum port 13 into the external container cavity. Alternatively, air from the external container cavity can enter the housing 11 through the vacuum port 13 and then flow into the atmosphere through the vents 12, thus achieving airflow.

[0041] Please see Figure 2 and Figure 4 The driving screw 21 has multiple sets of first helical teeth 211 arranged in a rotationally symmetrical manner along its axis, and a set of first helical tooth grooves 212 is provided between two adjacent sets of first helical teeth 211. The driven screw 22 has multiple sets of second helical teeth 221 arranged in a rotationally symmetrical manner along its axis, and a set of second helical tooth grooves 222 is provided between two adjacent sets of second helical teeth 221. On the same cross section of the driving screw 21 and the driven screw 22, the arc profile of the first helical teeth 211 is the same as the arc profile of the second helical tooth groove 222, and the arc profile of the second helical teeth 221 is the same as the arc profile of the first helical tooth groove 212, so that the driving screw 21 and the driven screw 22 are meshed and connected. One of the first helical teeth 211 is located in the second helical tooth groove 222. Under the action of the drive assembly 3, the drive screw 21 rotates so that the other adjacent first helical tooth 211 is located in the other adjacent second helical tooth groove 222 of the driven screw 22. This cycle is repeated to realize the forward rotational meshing and reverse rotational meshing of the drive screw 21 and the driven screw 22.

[0042] Please see Figure 2 and Figure 3 It is understandable that when air needs to enter the container cavity, the drive assembly 3 drives the active screw 21 and the driven screw 22 to rotate relative to each other. During the meshing rotation of the active screw 21 and the driven screw 22, the air flows towards the first flange 14. The gas enters the pump body assembly 1 from the vent 12. The first helical tooth 211 and the second helical tooth groove 222, as well as the second helical tooth 221 and the first helical tooth groove 212 gradually come into contact, so that the gas is compressed along the first helical tooth groove 212 and the second helical tooth groove 222 towards the first flange 14, and thus the gas enters the container cavity through the vacuum port 13.

[0043] When a vacuum needs to be evacuated from the container cavity, the drive assembly 3 drives the active screw 21 and the driven screw 22 to rotate in opposite directions. During the meshing rotation of the active screw 21 and the driven screw 22, air flows towards the second flange 15. The gas in the container cavity communicates with the first helical groove 212 and the second helical groove 222 through the vacuum port 13. The first helical tooth 211 and the second helical groove 222 gradually separate as the active screw 21 and the driven screw 22 rotate, and adjacent first helical grooves 212 and adjacent second helical grooves 222 separate. As the rotating teeth 221 gradually approach and mesh, the gas at the exhaust port is compressed towards the second flange 15 guided by the first helical groove 212 and the second helical groove 222. During the rotation of the screw assembly 2, the gas with exhaust pressure in the container cavity is discharged sequentially through the vacuum port 13 to the vent port 12, thereby realizing the function of vacuuming the container cavity. The fit between the first helical rotating teeth 211 and the second helical groove 222, and between the second helical rotating teeth 221 and the first helical groove 212, improves the suction efficiency of the vacuum pump.

[0044] Both the driving screw 21 and the driven screw 22 are equal-pitch screws, with the same pitch for both. This ensures synchronous movement between the driving and driven screws 21 and 22, guaranteeing that the displacement of the driven screw 22 always matches the displacement of the driving screw 21. Because the speeds of the driving and driven screws 21 and 22 are consistent, stable flow and pressure are maintained, resulting in continuous and uniform air compression. The gas, guided by the first helical tooth 211 and the second helical tooth groove 222, and the second helical tooth 221 and the first helical tooth groove 212, is smoothly compressed, making it suitable for operation under high gas loads and improving the pump's pumping performance. Furthermore, when the operating speed needs to be changed, only the rotational speed needs to be adjusted; there is no need to replace the screws or change the transmission ratio, making pump control and adjustment easy.

[0045] Please see Figure 2 and Figure 4In this embodiment, on the same cross-section, the contours of the first helical tooth 211, the first helical tooth groove 212, the second helical tooth 221, and the second helical tooth groove 222 are all arcs. It can be understood that the arc-shaped contours increase the contact area between the driving screw 21 and the driven screw 22, resulting in a more uniform distribution of meshing force. This reduces impact and vibration during rotation, enhances the load-bearing capacity and torsional resistance of the driving screw 21 and the driven screw 22, thereby improving transmission efficiency and stability. Secondly, the driving screw 21 and the driven screw 22 will not easily disengage in a stationary state, possessing a certain degree of self-locking capability. When the vacuum pump needs to be installed vertically, this improves the connection stability between the driving screw 21 and the driven screw 22, expands the installation methods of the vacuum pump, and reduces the limitations on its use.

[0046] In practical applications, the radius of curvature of the arc profile ranges from 45 degrees to 135 degrees, such as 45 degrees, 60 degrees, 75 degrees, 90 degrees, 105 degrees, 120 degrees, or 135 degrees. Depending on the application requirements, different radii can be selected for the first helical tooth 211, the first helical tooth groove 212, the second helical tooth 221, and the second helical tooth groove 222. For example, a larger radius can be selected for low-speed applications, while a smaller radius can be selected for high-speed applications.

[0047] Please see Figure 4 On the same cross-section, adjacent first helical teeth 211 and first helical grooves 212 are distributed symmetrically along the first connection point 213, and adjacent second helical teeth 221 and second helical grooves 222 are distributed symmetrically along the second connection point 223. The first connection point 213 is located at the connection position of adjacent first helical teeth 211 and first helical grooves 212, and the second connection point 223 is located at the connection position of adjacent second helical teeth 221 and second helical grooves 222. This point-symmetric configuration ensures more accurate and stable meshing between the first helical teeth 211 and the second helical grooves 222, and between the first helical grooves 212 and the second helical teeth 221. This reduces impact and noise during operation, enhances the overall rigidity and structural balance of the teeth and grooves, and helps to evenly distribute torque, disperse the load, prevent premature wear caused by concentration in individual parts, and improve the reliability of the entire system.

[0048] In this embodiment, the driving screw 21 has four sets of first helical teeth 211, which are arranged in a cross shape on the same cross section; the driven screw 22 has four sets of second helical teeth 221, which are also arranged in a cross shape on the same cross section. The cross-shaped arrangement of the first and second helical teeth 211 and 221 enables alternating positive and negative forces between the driving screw 21 and the driven screw 22, allowing for continuous torque transmission, avoiding torque interruption, and achieving efficient torque transmission.

[0049] Please see Figure 2 The screw assembly 2 also includes a transmission component 23, through which the driving screw 21 is connected to the driven screw 22. In this embodiment, the transmission component 23 consists of a driving gear and a driven gear, which are synchronous gears. The driving gear is located at the end of the driving screw 21, and the driven gear meshes with the driving gear and is located at the end of the driven screw 22. The rotation of the driving gear drives the driven gear to rotate synchronously, so that the driving screw 21 drives the driven screw 22 to rotate in opposite directions or relative to each other.

[0050] The drive assembly 3 includes a mounting plate 31, a transmission gear 32, a transmission rod 33, a drive wheel 34, a driven wheel 35, a timing belt 36, and a drive mechanism. Two mounting plates 31 are provided, both located on the side of the housing 11, and are fixedly connected to the first flange 14 and the second flange 15, respectively. The transmission rod 33 passes through the mounting plate 31, and its length direction is the same as that of the drive screw 21. The drive end of the drive mechanism is connected to the drive screw 21, and the gear side of the transmission gear 32 is connected to the drive end of the drive mechanism. The center of the transmission gear 32 is connected to one end of the transmission rod 33. The other end of the transmission rod 33 is connected to the center of the drive wheel 34. The drive wheel 34 is connected to the driven wheel 35 via the timing belt 36, and the driven wheel 35 is rotatably connected to the end of the drive screw 21 near the second flange 15. The drive wheel 34, driven wheel 35, and timing belt 36 are located on the side of the second flange 15, and the driven wheel 35 is coaxially connected to the drive gear. The drive end of the drive mechanism drives the transmission gear 32 to rotate. The transmission gear 32 and the transmission rod 33 rotate synchronously to drive the drive wheel 34 to rotate. The rotation of the drive wheel 34 drives the synchronous belt 36 and the driven wheel 35 to rotate synchronously, so that the synchronous rotation of the drive gear realizes the rotation of the drive screw 21.

[0051] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vacuum pump, characterized in that, include: A pump body assembly includes a vent and a vacuum port; both the vent and the vacuum port are connected to the interior of the pump body assembly. A screw assembly is disposed inside the pump body assembly. The screw assembly includes a driving screw and a driven screw arranged parallel to each other within the pump body assembly. The driving screw has multiple sets of first helical teeth arranged rotationally symmetrically along its axis. A set of first helical tooth grooves is provided between two adjacent sets of first helical teeth. The driven screw has multiple sets of second helical teeth arranged rotationally symmetrically along its axis. A set of second helical tooth grooves is provided between two adjacent sets of second helical teeth. On the same cross-section of the driving screw and the driven screw, the arcuate profile of the first helical teeth is the same as the arcuate profile of the second helical tooth grooves, and the arcuate profile of the second helical teeth is the same as the arcuate profile of the first helical tooth grooves, so that the driving screw and the driven screw are meshed and connected. A drive assembly for driving the active screw to rotate.

2. The vacuum pump according to claim 1, characterized in that, On the same cross-section, the outlines of the first helical tooth, the first helical tooth groove, the second helical tooth, and the second helical tooth groove are all circular arcs.

3. The vacuum pump according to claim 2, characterized in that, On the same cross section, adjacent first helical teeth and first helical grooves are distributed symmetrically with respect to the first connection point, and adjacent second helical teeth and second helical grooves are distributed symmetrically with respect to the second connection point. The first connection point is located at the connection position of the adjacent first helical tooth and the first helical tooth groove, and the second connection point is located at the connection position of the adjacent second helical tooth and the second helical tooth groove.

4. The vacuum pump according to claim 3, characterized in that, The active screw is provided with four sets of first helical teeth; on the same cross section, the four sets of first helical teeth are arranged in a cross shape; The driven screw is provided with four sets of second helical teeth; on the same cross section, the four sets of second helical teeth are arranged in a cross shape.

5. The vacuum pump according to claim 2, characterized in that, On the same cross-section, the arcuate values ​​of the arcuate profiles of the first helical tooth, the first helical tooth groove, the second helical tooth, and the second helical tooth groove are all in the range of 45 degrees to 135 degrees.

6. The vacuum pump according to claim 1, characterized in that, Both the driving screw and the driven screw are equal-pitch screws, and the pitch of the driving screw and the pitch of the driven screw are the same.

7. The vacuum pump according to claim 1, characterized in that, The pump body assembly includes a housing, a first flange, and a second flange; the first flange and the second flange are disposed opposite to each other on both sides of the housing; the driving screw and the driven screw are both rotatably disposed between the first flange and the second flange.

8. The vacuum pump according to claim 7, characterized in that, The pump body assembly includes two air vents; the two air vents are located at the middle of both sides of the housing, opposite to the driving screw and the driven screw. The vacuum port is located on the end face of the first flange.

9. The vacuum pump according to claim 7, characterized in that, The drive assembly includes a drive mechanism, the drive end of which is connected to the driving screw; the screw assembly includes a transmission component, and the driving screw is connected to the driven screw through the transmission component.

10. The vacuum pump according to claim 9, characterized in that, The drive assembly also includes a mounting plate, transmission gears, transmission rods, a drive wheel, a driven wheel, and a timing belt; The mounting plate is disposed on the side of the cover; the transmission rod passes through the mounting plate; the gear side of the transmission gear is connected to the drive end of the drive mechanism; the center of the transmission gear is connected to one end of the transmission rod; the other end of the transmission rod is connected to the center of the driving wheel; the driving wheel is connected to the driven wheel through the synchronous belt; the driven wheel is rotatably connected to one end of the driving screw near the second flange.

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