Two-stage series screw vacuum pump

Abstract

The utility model discloses a two-stage serial screw vacuum pump which comprises a two-stage pump body, one end of the two-stage pump body is connected with a driving assembly, the upper portion of the inner side of the two-stage pump body is connected with a first-stage compression screw in a rotating mode, and the lower portion of the inner side of the two-stage pump body is connected with a second-stage compression screw in a rotating mode. One end of the first-stage compression screw and one end of the second-stage compression screw are in driving connection with the output end of the driving assembly, the ends, connected with the driving assembly, of the first-stage compression screw and the second-stage compression screw are communicated and intersected, and two sets of symmetrical vacuum pressurization assemblies are arranged at the intersection position of the first-stage compression screw and the second-stage compression screw. Output ports of the vacuum pressurization assembly are located in the upper side and the lower side of the bipolar pump body. According to the utility model, the two groups of vacuum pressurizing assemblies are simultaneously utilized to provide great suction force for the position of the first-stage compression screw rod, so that the vacuum extraction suction force of the bipolar serial screw vacuum pump is improved, and further improvement of the bipolar serial screw vacuum pump is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bipolar series screw vacuum pumps, in particular to a two-stage series screw vacuum pump. Background Art

[0002] The two-stage tandem screw vacuum pump is a highly efficient and energy-saving vacuum pumping equipment. It combines the characteristics of two single-stage screw vacuum pumps. Through the series connection, the pumping efficiency and ultimate vacuum degree of the whole machine are significantly improved. The working principle of the two-stage tandem screw vacuum pump is based on the relative movement of the screw rotors. Through the opposite movement of a pair of asymmetric screw rotors, the inter-tooth volume is periodically changed to realize the function of conveying gas. This design enables the pump to ensure a large pumping speed in a wide pressure range, and the exhaust volume is almost unaffected by the exhaust pressure.

[0003] Although the traditional bipolar tandem screw vacuum pump can greatly increase the vacuum extraction efficiency and suction force by connecting two screw vacuum pumps in series, the extraction force of the bipolar tandem screw vacuum pump is still limited, and it is difficult to increase the vacuum extraction suction force under the same conditions. Therefore, it is urgent to design a two-stage tandem screw vacuum pump to solve the above problems. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a two-stage tandem screw vacuum pump, in which a vacuum booster component is added inside the bipolar intersection chamber at the ends of the two sets of screws, which can discharge the compressed air compressed inside the bipolar intersection chamber in a unidirectional manner, thereby further improving the air suction of the bipolar pump body, thereby achieving the improvement of the vacuum extraction suction of the bipolar tandem vacuum pump.

[0005] The double-stage series screw vacuum pump provided by the utility model:

[0006] It includes a bipolar pump body, one end of which is connected to a driving assembly, the upper inner side of the bipolar pump body is rotatably connected to a primary compression screw, the lower inner side of the bipolar pump body is rotatably connected to a secondary compression screw, one end of the primary compression screw and the secondary compression screw are drivingly connected to an output end of the driving assembly, the primary compression screw and the secondary compression screw are connected to one end of the driving assembly and are connected and intersected, two groups of symmetrical vacuum boosting assemblies are provided at the intersection of the primary compression screw and the secondary compression screw, and the output port of the vacuum boosting assembly is located on the upper and lower sides of the bipolar pump body.

[0007] Preferably, the primary compression screw and the secondary compression screw are respectively provided in a pair staggered with each other, and the primary compression screw and the secondary compression screw are staggeredly meshed with each other.

[0008] Preferably, a transmission gear set is fixed to one end of the driving assembly connecting the primary compression screw and the secondary compression screw, and the transmission gear set is divided into a driving gear and a driven gear. The primary compression screw and the secondary compression screw that are staggered with each other are meshed and transmitted through the driving gear and the driven gear. The transmission gear set allows the paired primary compression screw and the secondary compression screw to transmit to each other and maintain relative rotation to complete the extraction and compression of air.

[0009] Preferably, an air inlet is provided in the middle of one end of the top of the bipolar pump body away from the driving component, and the bottom of the air inlet is connected to the upper part of the first-stage compression screw. A first air outlet is provided at the bottom of one side of the bipolar pump body away from the driving component, and the first air outlet is connected to the output port of the second-stage compression screw. A second air outlet and a third air outlet are respectively provided on the upper and lower sides of the position where the bipolar pump body is connected to the vacuum booster component, and the second air outlet and the third air outlet are connected to the upper and lower sides of the vacuum booster component. The air inlet can absorb external air and draw a vacuum into a designated space, while the first air outlet can discharge the air extracted by the second-stage compression screw to the outside, and the second air outlet and the third air outlet can discharge the air absorbed by the two groups of vacuum booster components to the outside.

[0010] Preferably, a primary compression chamber is opened at the position where the bipolar pump body is connected to the primary compression screw, and the bipolar pump body is rotatably connected to the inside of the primary compression chamber, a secondary compression chamber is opened at the position where the bipolar pump body is connected to the secondary compression screw, and the secondary compression screw is rotatably connected to the inside of the secondary compression chamber, a bipolar intersection chamber is opened at the position where the bipolar pump body is connected to the vacuum boosting component, boosting grooves are opened on the upper and lower sides of the bipolar intersection chamber, and the outer wall of the vacuum boosting component is rotatably connected to the inner surface of the boosting groove.

[0011] Preferably, the driving assembly includes a driving motor, and the driving motor is provided with two driving connections with the primary compression screw and the secondary compression screw respectively. A rotating shaft is passed through the center of the primary compression screw and the secondary compression screw, and one end of the rotating shaft is connected to a bearing. One end of the rotating shaft connected to the bearing is rotatably connected to the inner wall of the bipolar pump body, and the other end of the rotating shaft is passed through the inner side of the vacuum booster assembly and the inner side of the transmission gear group. One end of the rotating shaft connected to the vacuum booster assembly and the transmission gear group is transmission-connected to the output end of the driving motor, and the vacuum booster assembly includes a first cam and a second cam, and the first cam and the second cam are respectively fixed on the outer walls of the ends of the primary compression screw and the secondary compression screw.

[0012] Compared with the related art, the double-stage tandem screw vacuum pump provided by the utility model has the following beneficial effects:

[0013] 1. The utility model adds two sets of vacuum increasing components at the series position of the bipolar series screw vacuum pump, which can quickly discharge the compressed air absorbed by the vacuum pump to the outside in one direction, thereby increasing the suction force of the secondary compression screw on the primary compression screw position. At the same time, the two sets of vacuum boosting components can provide great suction force to the primary compression screw position, thereby improving the vacuum extraction suction force of the bipolar series screw vacuum pump, and realizing further improvement of the bipolar series screw vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a preferred embodiment of a two-stage series screw vacuum pump provided by the utility model;

[0015] Figure 2 for Figure 1 The schematic diagram of the cross-sectional structure of the middle part of the bipolar pump body shown;

[0016] Figure 3 for Figure 2 A schematic diagram of the structural breakdown inside the bipolar pump body shown;

[0017] Figure 4 for Figure 3 The structural decomposition and enlarged schematic diagram of the first-stage compression screw position is shown.

[0018] Numbers in the figure: 1. Bipolar pump body; 2. Drive assembly; 3. Primary compression screw; 4. Secondary compression screw; 5. Vacuum booster assembly; 6. Transmission gear set; 11. Air inlet; 12. First air outlet; 13. Second air outlet; 14. Third air outlet; 15. Primary compression chamber; 16. Secondary compression chamber; 17. Bipolar intersection chamber; 18. Booster groove; 21. Drive motor; 31. Rotating shaft; 32. Bearing; 51. First cam; 52. Second cam; 61. Driving gear; 62. Driven gear. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0021] Please see attached Figure 1-Figure 4 The double-stage tandem screw vacuum pump provided by the embodiment of the utility model comprises:

[0022] A bipolar pump body 1 has symmetrical compression chambers and secondary compression chambers 16 on the upper and lower sides thereof. The first compression chamber 15 and the second compression chamber 16 are rotatably connected with the first compression screw 3 and the second compression screw 4 respectively. Through the rotation of the first compression screw 3 and the second compression screw 4, the first compression screw 3 can draw in external air, while the second compression screw 4 draws in the air compressed by the first compression screw 3 and applies suction to the compression screw, thereby improving the suction of the bipolar series screw vacuum pump.

[0023] An air inlet 11 is provided on one side of the top of the bipolar pump body 1, and the air inlet 11 is connected to the interior of the first-stage compression chamber 15. The air inlet 11 can be connected to a vessel or space that needs to be vacuumed through a pipeline to vacuumize the interior.

[0024] A first gas outlet 12 is connected to the lower side of one end of the bipolar pump body 1. The first gas outlet 12 is connected to the inside of the secondary compression chamber 16, so that the gas absorbed by the secondary compression screw 4 can be discharged to the outside.

[0025] A driving assembly 2 is provided at one end of the bipolar pump body 1 away from the first air outlet 12. The driving assembly 2 includes a driving motor 21 and various motors such as a servo motor and a synchronous motor. The driving motor 21 has two groups of driving connections with the primary compression screw 3 and the secondary compression screw 4 respectively.

[0026] A bipolar intersection chamber 17 is opened inside the bipolar pump body 1 near one end of the compression screw and the secondary compression screw 4. The bipolar intersection chamber 17 can transport the air absorbed by the primary compression screw 3 to the position of the secondary compression screw 4, and connect the compression chamber and the secondary compression chamber 16.

[0027] Symmetrical vacuum booster components 5 are provided on the upper and lower sides of the bipolar intersection chamber 17. The vacuum booster components 5 include two mutually meshing first cams 51 and second cams 52. The first cams 51 and second cams 52 are respectively connected to the first-stage compression screw 3 and the second-stage compression screw 4 that are symmetrically meshed with each other. When the drive motor 21 is driven and the compression screw and the second-stage compression screw 4 are driven, the first cam 51 and the second cam 52 are synchronously driven to rotate synchronously. The meshing between the cams and the fitting between the cams and the inner wall of the booster groove 18 are used to discharge the air inside the bipolar intersection chamber 17, thereby enhancing the vacuum extraction performance of the bipolar pump body 1.

[0028] One end of the primary compression screw 3 and the secondary compression screw 4 connecting the first cam 51 and the second cam 52 is connected to a driving gear 61 and a driven gear 62, and the driving gear 61 and the driven gear 62 are meshed with each other. Through the meshing between the driving gear 61 and the driven gear 62, a pair of the primary compression screw 3 and the secondary compression screw 4 that are meshed with each other can be meshed and transmitted with each other.

[0029] Usage process:

[0030] When the drive motor 21 is started, the output end of the drive motor 21 will drive the compression screw and the secondary compression screw 4 to rotate, and at the same time drive the first cam 51 and the second cam 52 to rotate. Since the compression screw and the secondary compression screw 4 are designed in pairs, the synchronous rotation of the primary compression screw 3 and the secondary compression screw 4 can be completed. When the compression screw and the secondary compression screw 4 rotate, the secondary compression screw 4 will provide suction to the inside of the primary compression chamber 15 through the bipolar intersection chamber 17, and the compression screw will provide suction to the air inlet 11, and vacuum will be drawn to the position connected to the air inlet 11.

[0031] When the primary compression screw 3 and the secondary compression screw 4 rotate, the vacuum booster assembly 5 also rotates synchronously, and the air inside the bipolar intersection chamber 17 is quickly discharged to the outside, thereby increasing the suction force inside the bipolar pump body 1.

[0032] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0033] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. Two-stage tandem screw vacuum pump, characterized in that: The invention comprises a bipolar pump body (1), one end of the bipolar pump body (1) is connected to a driving assembly (2), the upper inner part of the bipolar pump body (1) is rotatably connected to a primary compression screw (3), the lower inner part of the bipolar pump body (1) is rotatably connected to a secondary compression screw (4), one end of the primary compression screw (3) and the secondary compression screw (4) are drivably connected to the output end of the driving assembly (2), the primary compression screw (3) and the secondary compression screw (4) are connected to one end of the driving assembly (2) and are connected and intersected, two groups of symmetrical vacuum boosting assemblies (5) are arranged at the intersection of the primary compression screw (3) and the secondary compression screw (4), and the output ports of the vacuum boosting assemblies (5) are located on the upper and lower sides of the bipolar pump body (1).

2. The two-stage tandem screw vacuum pump according to claim 1, characterized in that: The primary compression screw (3) and the secondary compression screw (4) are respectively provided in a pair staggered with each other, and the primary compression screw (3) and the secondary compression screw (4) are staggeredly meshed with each other.

3. The two-stage tandem screw vacuum pump according to claim 1, characterized in that: A transmission gear set (6) is fixed to one end of the primary compression screw (3) and the secondary compression screw (4) connected to the drive assembly (2); the transmission gear set (6) is divided into a driving gear (61) and a driven gear (62); the primary compression screw (3) and the secondary compression screw (4) are interlaced with each other and are meshed and driven by the driving gear (61) and the driven gear (62).

4. The two-stage tandem screw vacuum pump according to claim 1, characterized in that: An air inlet (11) is provided in the middle of one end of the top of the bipolar pump body (1) away from the driving component (2), and the bottom of the air inlet (11) is connected to the upper part of the first compression screw (3). A first air outlet (12) is provided at the bottom of one side of the bipolar pump body (1) away from the driving component (2), and the first air outlet (12) is connected to the output port of the second compression screw (4). A second air outlet (13) and a third air outlet (14) are respectively provided on the upper and lower sides of the position where the bipolar pump body (1) is connected to the vacuum booster component (5), and the second air outlet (13) and the third air outlet (14) are connected to the upper and lower sides of the vacuum booster component (5).

5. The two-stage tandem screw vacuum pump according to claim 1, characterized in that: A primary compression chamber (15) is provided at the position where the bipolar pump body (1) is connected to the primary compression screw (3), and the bipolar pump body (1) is rotatably connected to the inner side of the primary compression chamber (15). A secondary compression chamber (16) is provided at the position where the bipolar pump body (1) is connected to the secondary compression screw (4), and the secondary compression screw (4) is rotatably connected to the inner side of the secondary compression chamber (16). A bipolar intersection chamber (17) is provided at the position where the bipolar pump body (1) is connected to the vacuum boosting component (5), and boosting grooves (18) are provided on the upper and lower sides of the bipolar intersection chamber (17), and the outer wall of the vacuum boosting component (5) is rotatably connected to the inner surface of the boosting groove (18).

6. The two-stage tandem screw vacuum pump according to claim 1, characterized in that: The driving assembly (2) comprises a driving motor (21), wherein the driving motor (21) is provided with two shafts respectively connected to the primary compression screw (3) and the secondary compression screw (4) for driving, wherein a rotating shaft (31) is passed through the center of the primary compression screw (3) and the secondary compression screw (4), wherein one end of the rotating shaft (31) is connected to a bearing (32), wherein one end of the rotating shaft (31) connected to the bearing (32) is rotatably connected to the inner wall of the bipolar pump body (1), and the other end of the rotating shaft (31) is passed through the inner side of the vacuum boosting assembly (5) and the inner side of the transmission gear set (6), wherein one end of the rotating shaft (31) connected to the vacuum boosting assembly (5) and the transmission gear set (6) is transmission-connected to the output end of the driving motor (21), and wherein the vacuum boosting assembly (5) comprises a first cam (51) and a second cam (52), wherein the first cam (51) and the second cam (52) are respectively fixed to the outer walls of the ends of the primary compression screw (3) and the secondary compression screw (4).

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