Roots vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a Roots vacuum pump which comprises a shell, an end cover, a rotor, a driving gear, a driven gear and a motor, the end cover is connected to the shell and provided with a plurality of first connecting holes, a first containing cavity is formed in the side, close to the shell, of the end cover, the rotor is rotationally embedded in the shell, one end of the rotor extends into the first containing cavity, and the other end of the rotor extends into the driven gear. The number of the rotors is two, the driving gear and the driven gear are coaxially connected to the two rotors correspondingly, the driving gear is meshed with the driven gear, a mounting cavity is formed in the bottom of the first containing cavity, and the motor is embedded in the mounting cavity and used for driving the rotors to rotate. The motor is embedded in the mounting cavity, and the output shaft of the motor extends into the first accommodating cavity, is connected with the rotor and drives the rotor to rotate, so that direct contact between the motor and an external object is avoided, the possibility that the motor and a transmission part are damaged by the external object is reduced, and the service life of the Roots vacuum pump is prolonged.

Description

Technical Field

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

[0002] A Roots vacuum pump is a type of variable displacement vacuum pump containing two synchronously rotating, oppositely oriented lobe rotors. The rotors have small gaps between them and between the rotors and the pump casing wall, preventing direct contact. Roots vacuum pumps have undergone long-term testing in applications such as petroleum, chemical, plastics, pesticide, turbine rotor dynamic balancing, and aerospace space simulation, and therefore should be widely promoted and applied domestically. They are also widely used in the petroleum, chemical, metallurgical, and textile industries. Vacuum pump accessories, such as silencers, are used for noise control in vacuum pumps.

[0003] In existing Roots vacuum pumps, the motor is placed outside the pump body and connected to any rotor via couplings and pulleys, enabling the pump to operate. The motor and transmission components are in direct contact with external objects, which can easily lead to damage and shorten the pump's lifespan. Utility Model Content

[0004] In order to reduce the possibility of damage to the motor and transmission components by objects and to ensure the service life of the Roots vacuum pump, this application provides a Roots vacuum pump.

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

[0006] A Roots vacuum pump includes a housing, an end cover, a rotor, a driving gear, a driven gear, and a motor. The end cover is connected to the housing and has a plurality of first connecting holes spaced apart circumferentially along the end cover. The first connecting holes are used for bolts to pass through and be threaded into the housing. A first receiving cavity is provided on the side of the end cover near the housing. The rotor is rotatably embedded in the housing, with one end of the rotor extending into the first receiving cavity. There are two rotors, which are spaced apart vertically. The driving gear and the driven gear are coaxially connected to the two rotors and mesh with each other. A mounting cavity is provided at the bottom of the first receiving cavity, and the motor is embedded in the mounting cavity. The motor is used to drive the rotor to rotate.

[0007] By adopting the above technical solution, the motor is embedded in the mounting cavity, and the output shaft of the motor extends into the first receiving cavity to connect with the rotor and drive the rotor to rotate. This avoids direct contact between the motor and external objects, reduces the possibility of damage to the motor and transmission components by external objects, and improves the service life of the Roots vacuum pump.

[0008] Preferably, it further includes a fixing cover, wherein a boss is connected to the side of the end cover away from the housing, and the boss extends through the side of the mounting cavity away from the first receiving cavity, and the fixing cover is connected to the boss and covers the mounting cavity.

[0009] By adopting the above technical solution, a through boss is installed on the side of the mounting cavity away from the first receiving cavity, and a fixing cover is connected to the boss and covers the opening of the mounting cavity, which facilitates the inspection and maintenance of the motor in the mounting cavity after the fixing cover is removed.

[0010] Preferably, the fixed cover is connected to a water inlet connector and a water outlet connector on the side away from the boss, and the boss is provided with a cooling channel, which is connected to the water inlet connector and the water outlet connector.

[0011] By adopting the above technical solution, the water inlet and outlet connectors on the fixed cover can effectively introduce and discharge coolant, and the cooling channel set on the boss can make the coolant flow evenly through the area around the motor, thereby effectively reducing the heat generated by the motor during operation and improving the motor's working efficiency and service life.

[0012] Preferably, a plurality of heat dissipation fins are fixedly connected to the side of the end cap away from the housing, and the plurality of heat dissipation fins are spaced apart along a direction perpendicular to the length of the heat dissipation fins.

[0013] By adopting the above technical solution, heat dissipation fins are set to increase the contact area between the end cover and the outside air, thereby improving the heat dissipation efficiency of the end cover, so that the motor and rotor are at a suitable operating temperature, and the service life of the Roots vacuum pump is improved.

[0014] Preferably, the end cap has a plurality of first grooves on its outer periphery near the housing, and the plurality of first grooves are distributed at intervals along the circumference of the end cap.

[0015] By adopting the above technical solution, a first groove is set, which makes it easy for workers to insert their fingers into the groove and apply force to the side away from the shell to separate the end cap from the shell.

[0016] Preferably, it further includes a connecting shell, which is connected between the end cap and the housing. The connecting shell has a second receiving cavity that communicates with the first receiving cavity. The connecting shell has a second connecting hole, the number of which is the same as the number of which is the first connecting hole and they correspond one-to-one. The connecting shell has a plurality of second grooves on both sides along the rotor rotation axis, and the plurality of second grooves are distributed at intervals along the circumference of the connecting shell.

[0017] By adopting the above technical solution, a connecting shell is set up, and the first and second receiving cavities are connected, thereby adjusting the space of the first and second receiving cavities to meet the usage requirements of different Roots vacuum pumps and improve the applicability of Roots vacuum pumps.

[0018] Preferably, it also includes a second sealing ring, and the connecting shell has a second sealing groove on the side away from the end cap, the second sealing ring is embedded in the second sealing groove, and the end of the second sealing ring away from the second sealing ring abuts against the side surface of the shell near the connecting shell.

[0019] By adopting the above technical solution, the second sealing ring is embedded in the second sealing groove, which reduces the possibility of leakage between the connecting shells and between the connecting shell and the housing, and improves the sealing effect between the connecting shells and between the connecting shell and the housing.

[0020] Preferably, it also includes a first sealing ring, and the end cap is provided with a first sealing groove on the side near the housing. The first sealing ring is embedded in the first sealing groove, and the side surface of the first sealing ring away from the bottom of the first sealing groove abuts against the side surface of the connecting shell near the end cap or the side surface of the housing near the end cap.

[0021] By adopting the above technical solution, the first sealing ring is embedded in the first sealing groove, which reduces the possibility of leakage between the end cover and the connecting shell or between the end cover and the shell, and improves the sealing effect between the end cover and the connecting shell or between the end cover and the shell.

[0022] Preferably, the bottom of the first receiving cavity is provided with an oil inlet, which is connected to the outside.

[0023] By adopting the above technical solution, an oil inlet is provided to facilitate the addition of lubricating oil to the first and second accommodating cavities.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The motor is embedded in the mounting cavity, and the output shaft of the motor extends into the first receiving cavity to connect with the rotor and drive the rotor to rotate. This avoids direct contact between the motor and external objects, reduces the possibility of damage to the motor and transmission components by external objects, and improves the service life of the Roots vacuum pump.

[0026] 2. A through boss is provided on the side of the mounting cavity away from the first receiving cavity. A fixing cover is connected to the boss and covers the opening of the mounting cavity, so that the motor inside the mounting cavity can be inspected and repaired after the fixing cover is removed.

[0027] 3. A connecting shell is provided, which connects the first and second receiving cavities, thereby adjusting the space of the first and second receiving cavities to meet the usage requirements of different Roots vacuum pumps and improve the applicability of the Roots vacuum pumps. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a Roots vacuum pump.

[0029] Figure 2 This is a partial cross-sectional view of a Roots vacuum pump.

[0030] Figure 3 This is a schematic diagram of a partial explosion of a Roots vacuum pump.

[0031] Figure 4 This is a schematic diagram of a partial explosion structure from another perspective of a Roots vacuum pump.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Housing; 11. Support foot; 111. First mounting hole; 12. First fixing hole; 13. Rotating cavity; 14. Rotating groove;

[0034] 2. End cap; 21. First connecting hole; 22. First receiving cavity; 23. Mounting cavity; 24. Boss; 241. Cooling channel; 25. Heat dissipation fins; 26. First groove; 27. First sealing groove; 28. Oil inlet; 29. ​​Annular groove; 210. Embedded groove;

[0035] 3. Fixed cover; 31. Water inlet connector; 32. Water outlet connector;

[0036] 4. Connecting shell; 41. Second connecting hole; 42. Second receiving cavity; 43. Second groove; 44. Second sealing groove;

[0037] 51. Rotor; 52. Driving gear; 53. Driven gear; 54. Motor; 55. First sealing ring; 56. Second sealing ring; 57. Lifting lug. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the accompanying drawings.

[0039] Reference Figure 1This application discloses a Roots vacuum pump including a housing 1 and lifting lugs 57. A support leg 11 is fixedly connected to the lower end of the housing 1. Several support legs 11 are provided, divided into two groups. The two groups of support legs 11 are symmetrically distributed along the width direction of the housing 1, and the support legs 11 in each group are spaced apart along the length direction of the housing 1. In this embodiment, four support legs 11 are provided, with two support legs 11 in each group symmetrically distributed along the length direction of the housing 1. A first mounting hole 111 is provided on the side of each support leg 11 away from the other group of support legs 11. The first mounting hole 111 is used for bolts to pass through and threadedly connect to an external frame. Several first fixing holes 12 are provided at the upper end of the housing 1. The several first fixing holes 12 are divided into two groups. The two groups of first fixing holes 12 are symmetrically distributed along the length direction of the housing 1, and the first fixing holes 12 in each group are spaced apart along the width direction of the housing 1. In this embodiment, there are eight first fixing holes 12. The four first fixing holes 12 in the same group are divided into two groups. The two groups of first fixing holes 12 are symmetrically distributed along the width direction of the housing 1. The two first fixing holes 12 in the same group are spaced apart along the width direction of the housing 1. There are four lifting lugs 57. The four lifting lugs 57 are distributed at the four corners of the housing 1. The lower end of the lifting lug 57 is threaded into the first fixing hole 12.

[0040] A Roots vacuum pump also includes a connecting shell 4. The connecting shell 4 is fixedly connected to one side of the housing 1 along the length direction of the housing 1. The connecting shell 4 is provided with a second receiving cavity 42, which penetrates the connecting shell 4 along the length direction of the housing 1. In this embodiment, there are two connecting shells 4, which are evenly distributed along the length direction of the housing 1.

[0041] Reference Figure 2 and Figure 3 A Roots vacuum pump also includes a second sealing ring 56. A second sealing groove 44 is provided on the surface of the connecting shell 4 near the shell 1, and the second sealing groove 44 surrounds the opening of the second receiving cavity 42. The number of second sealing rings 56 is the same as the number of connecting shells 4 and corresponds one-to-one. The second sealing rings 56 are embedded in the second sealing grooves 44, with one end of the second sealing ring 56 abutting the bottom of the second sealing groove 44, and the other end abutting the surface of the shell 1 near the connecting shell 4 or the surface of the connecting shell 4 away from the shell 1. A plurality of second grooves 43 are provided on the outer periphery of both sides of the connecting shell 4 along the length direction of the shell 1. The plurality of second grooves 43 are divided into two groups, and the two groups of second grooves 43 are symmetrically distributed along the width direction of the shell 1. The plurality of second grooves 43 in the same group are spaced apart along the vertical direction. In this embodiment, there are four second grooves 43, and the two groups of second grooves 43 in the same group are symmetrically distributed along the vertical direction.

[0042] Reference Figure 1 and Figure 2A Roots vacuum pump also includes an end cap 2. The end cap 2 is fixedly connected to the surface of the connecting shell 4 away from the housing 1 on the side away from the housing 1, and the outer wall of the end cap 2 is flush with the outer wall of the connecting shell 4. The end cap 2 has a first receiving cavity 22 on the side near the connecting shell 4, and the first receiving cavity 22 is connected to a second receiving cavity 42, and the wall of the first receiving cavity 22 is flush with the wall of the second receiving cavity 42.

[0043] Reference Figure 2 and Figure 3 A Roots vacuum pump also includes a first sealing ring 55. A first sealing groove 27 is provided on the surface of the end cap 2 near the connecting shell 4. The first sealing groove 27 surrounds the opening of the first receiving cavity 22. The first sealing ring 55 is embedded in the first sealing groove 27, with one end of the first sealing ring 55 abutting the bottom of the first sealing groove 27 and the other end abutting the surface of the connecting shell 4 away from the shell 1. A plurality of first grooves 26 are provided on the outer periphery of the end cap 2 near the connecting shell 4. The number of first grooves 26 is the same as the number of second grooves 43 and they correspond one-to-one.

[0044] Reference Figure 3 and Figure 4 The end cap 2 has an annular groove 29 on its outer periphery away from the connecting shell 4. The bottom of the annular groove 29 has several first connecting holes 21. These first connecting holes 21 penetrate the end cap 2 along the length of the shell 1 and are located on the outer periphery of the first sealing groove 27. The several first connecting holes 21 are spaced apart circumferentially along the end cap 2. In this embodiment, there are sixteen first connecting holes 21, evenly distributed circumferentially along the annular groove 29. The connecting shell 4 has several second connecting holes 41. These second connecting holes 41 penetrate the connecting holes along the length of the shell 1 and are located on the outer periphery of the second sealing groove 44. The number of second connecting holes 41 is the same as the number of first connecting holes 21 and they correspond one-to-one. Bolts pass through the first connecting holes 21 and the second connecting holes 41 sequentially and are then threaded into the shell 1.

[0045] Reference Figure 2A Roots vacuum pump also includes a rotor 51, a driving gear 52, and a driven gear 53. The rotor 51 is rotatably embedded within the housing 1, with its rotation axis parallel to the length of the housing 1. One end of the rotor 51 extends into the second receiving cavity 42 and the first receiving cavity 22. Two rotors 51 are provided, vertically spaced apart. The bottom of the first receiving cavity 22 has a groove 210, and one end of the rotor 51 near the support foot 11 is coaxially rotatably embedded in the groove 210. A rotating cavity 13 is provided on the side of the housing 1 away from the connecting shell 4. The other end of the rotor 51 extends into the rotating cavity 13. Rotating grooves 14 are provided on the cavity wall of the rotating cavity 13 away from the connecting shell 4. The number of rotating grooves 14 is the same as the number of rotors 51 and they correspond one-to-one. The end of the rotor 51 away from the connecting shell 4 is coaxially rotatably embedded in the rotating groove 14. Both the driving gear 52 and the driven gear 53 are embedded in the rotating cavity 13. The driving gear 52 is coaxially fixedly connected to the outer periphery of the rotor 51 on the side away from the support foot 11, and the driven gear 53 is coaxially fixedly connected to the outer periphery of the other rotor 51. The driven gear 53 meshes with the driving gear 52.

[0046] Reference Figure 2 and Figure 4 A Roots vacuum pump also includes a fixed cover 3 and a motor 54. The end cover 2, away from the connecting shell 4, is fixedly connected to a boss 24. The boss 24 is cylindrical, and its axis coincides with the rotation axis of the rotor 51 on the side away from the support foot 11. A mounting cavity 23 is coaxially provided at the end of the boss 24 away from the end cover 2, and the mounting cavity 23 communicates with the first receiving cavity 22. The fixed cover 3 is connected to the boss 24 and covers the opening of the mounting cavity 23. The motor 54 is embedded in the mounting cavity 23 and is used to drive the rotor 51 to rotate. In this embodiment, the housing of the motor 54 is embedded in the mounting cavity 23, and the output shaft of the motor 54 is coaxially fixedly connected to the end of the rotor 51 on the side away from the support foot 11 near the end cover 2.

[0047] A plurality of heat dissipation fins 25 are fixedly connected to the side of the end cap 2 away from the connecting shell 4. The length direction of the heat dissipation fins 25 is parallel to the width direction of the shell 1, and the plurality of heat dissipation fins 25 are distributed vertically at intervals. In this embodiment, there are ten heat dissipation fins 25, and the ten heat dissipation fins 25 are evenly distributed vertically. The bottom of the first receiving cavity 22 is provided with an oil inlet 28, which is connected to the outside. The oil inlet 28 is located on the side of the first receiving cavity 22 near the support foot 11.

[0048] A water inlet connector 31 and a water outlet connector 32 are fixedly connected to the side of the fixed cover 3 away from the boss 24. The water inlet connector 31 and the water outlet connector 32 are located near the support foot 11 and are symmetrically distributed along the width direction of the housing 1. The boss 24 is provided with a cooling channel 241, which is connected to the water inlet connector 31 and the water outlet connector 32.

[0049] The implementation principle of a Roots vacuum pump according to an embodiment of this application is as follows: A motor 54 is coaxially connected to one end of a rotor 51 away from the support foot 11 via a coupling. A second sealing ring 56 is embedded in a second sealing groove 44. Two connecting shells 4 are sequentially connected to a housing 1. A first sealing ring 55 is embedded in a first sealing groove 27. An end cover 2 is connected to the side of the connecting shell 4 away from the housing 1. The motor 54 is embedded in the mounting cavity 23. Bolts pass sequentially through the first connecting hole 21 and the second connecting hole 41 and are threadedly connected to the housing 1, thus fixing the end cover 2, connecting shells 4, and housing 1 relatively. A fixing cover 3 is connected to the boss 24 and covers the opening of the mounting cavity 23, thus assembling the Roots vacuum pump. Lubricating oil is added to the first receiving cavity 22 and the second receiving cavity 42 through the oil inlet 28. Water enters through the water inlet connector 31, and the liquid flows out from the water outlet connector 32 after passing through the cooling channel 241.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A Roots vacuum pump, characterized by: The utility model provides a kind of motor, including shell (1), end cover (2), rotor (51), driving gear (52), driven gear (53) and motor (54);The end cover (2) is connected to shell (1);The end cover (2) is equipped with several first connecting holes (21);Several the first connecting hole (21) is spaced distribution along the circumference of end cover (2);The first connecting hole (21) is used for bolt to pass through after being connected with shell (1) with screw thread;The end cover (2) is equipped with first accommodating cavity (22) on the side close to shell (1);The rotor (51) rotates and is embedded in shell (1);The rotor (51) one end enters first accommodating cavity (22);The rotor (51) is equipped with two;Two the rotor (51) is spaced distribution along vertical direction;Driving gear (52) and driven gear (53) are coaxially connected to two rotors (51) respectively;Driving gear (52) and driven gear (53) are engaged;The first accommodating cavity (22) chamber bottom is equipped with installation cavity (23);The motor (54) is embedded in installation cavity (23);The motor (54) is used to drive rotor (51) to rotate.

2. - The Roots vacuum pump according to claim 1, characterized in that: Further comprising fixed cover (3);The side, away from shell (1), of end cover (2) is connected with boss (24);The side, away from first accommodating cavity (22), of installation cavity (23) penetrates boss (24);The fixed cover (3) is connected to boss (24) and covers installation cavity (23).

3. - The Roots vacuum pump according to claim 2, characterized in that: The side, away from boss (24), of fixed cover is connected with water inlet connector (31) and water outlet connector (32);The boss (24) is equipped with cooling flow channel (241);The cooling flow channel (241) is connected with water inlet connector (31) and water outlet connector (32) and communicates.

4. - The Roots vacuum pump according to claim 1, characterized in that: The side, away from shell (1), of end cover (2) is fixedly connected with several heat dissipation fins (25);Several the heat dissipation fin (25) is spaced distribution along the length direction perpendicular to heat dissipation fin (25).

5. - The Roots pump according to claim 1, characterized in that: The outer periphery of the side, close to shell (1), of end cover (2) is equipped with several first grooves (26);Several the first groove (26) is spaced distribution along the circumference of end cover (2).

6. - The Roots pump according to claim 5, characterized in that: Further comprising connecting shell (4);The connecting shell (4) is connected between end cover (2) and shell (1);The connecting shell (4) is equipped with second accommodating cavity (42);The second accommodating cavity (42) is connected with first accommodating cavity (22) and communicates;The connecting shell (4) is equipped with second connecting hole (41);The number of second connecting hole (41) is same with the number of first connecting hole (21) and one-to-one correspondence;The connecting shell (4) is equipped with several second grooves (43) on the two sides along the rotation axis of rotor (51);Several the second groove (43) is spaced distribution along the circumference of connecting shell (4).

7. - The Roots pump according to claim 6, characterized in that: Further comprising second sealing ring (56);The side, away from end cover (2), of connecting shell (4) is equipped with second sealing groove (44);The second sealing ring (56) is embedded in second sealing groove (44);The end, away from second sealing ring (56), of second sealing ring (56) abuts the surface of the side, close to connecting shell (4), of shell (1).

8. The Roots pump according to claim 6, characterized in that: Also include a first sealing ring (55); the end cover (2) is close to the side of the shell (1) is provided with a first sealing groove (27); the first sealing ring (55) is embedded in the first sealing groove (27); the first sealing ring (55) is away from the side surface of the first sealing groove (27) groove bottom abuts the side surface of the connecting shell (4) close to the end cover (2) or the side surface of the shell (1) close to the end cover (2).

9. The Roots pump according to claim 1, characterized in that: The first accommodating cavity (22) is provided with an oil inlet (28) at the bottom; the oil inlet (28) is communicated with the outside.

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