Vacuum pump with high concentricity and stable operation

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a high-concentricity vacuum pump stable in operation, which comprises a shell, a front end cover, a rear end cover, a front bearing gland, a rear bearing gland and a gear set. The front end cover and the rear end cover are in butt joint on two sides of the shell, the rotor is connected with an external motor at the front end cover end, the front end cover and the rear end cover are respectively provided with a first mounting groove and a second mounting groove which are communicated with each other, a bearing is arranged in the second mounting groove, the front bearing gland is arranged in the first mounting groove, one end of the front bearing gland abuts against the bearing, and the other end of the front bearing gland abuts against the rotor. The oil pool is arranged in the rear end cover, the gear set is arranged in the oil pool, vibration may be generated when the front end of the rotor is connected with the motor during working, the bearings at the two ends can limit the rotor and filter vibration of the front end of the rotor, the rear end of the rotor operates stably, noise is lowered, and the service life of the gear set is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and in particular to a vacuum pump with high concentricity and stable operation. Background Technology

[0002] A vacuum pump is a type of pump that evacuates a closed space to a predetermined vacuum level. The principle is to use the volume change generated by the rotation of the rotor in the pump chamber to expel gas from the pump.

[0003] Existing screw vacuum pumps have a rotor inside the casing, with end caps at both ends of the casing. Bearings are installed inside the end caps. The rotor consists of a pair of screws, and a gear set is installed at the front end. The pair of screws in the screw vacuum pump rotate at high speed in conjugate opposite directions to expel air from the casing. However, the gear set of the existing screw vacuum pump is located at the front end, which needs to be connected to a motor. This requires high installation precision for the motor. Even slight deviations can cause vibration of the front screws during rotation. The gear set is also prone to collision and compression during transmission, which may generate significant noise and affect the service life of the screw vacuum pump. Utility Model Content

[0004] To reduce the noise of vacuum pumps and extend their service life, this invention provides a vacuum pump with high concentricity and stable operation.

[0005] This utility model provides a high-concentricity, stable-operation vacuum pump, which adopts the following technical solution:

[0006] A high-concentricity, stable-operation vacuum pump includes a housing, a front cover, a rear cover, a front bearing cover, a rear bearing cover, and a gear set. The housing contains a rotor cavity, within which a pair of rotors are housed. The front and rear covers are abutted on opposite sides of the housing. The rotors are connected to an external motor at the front cover end. Both the front and rear covers have interconnected first and second mounting slots. The first mounting slot is located near the housing, and the second mounting slot contains a bearing. The front bearing cover is located within the first mounting slot, with one end abutting against the bearing. The front bearing cover contains a shaft hole. The rear bearing cover has the same structure as the front bearing cover. The rear cover contains an oil sump, and the gear set is located within the oil sump. The rotors pass through the bearings and connect to the gear set. The rotors, rotor cavity, first mounting slot, second mounting slot, and shaft hole are coaxially aligned.

[0007] By adopting the above technical solution, the gear set is set inside the rear end cover. The rear end cover is far away from the motor. When the motor rotates, it drives the rotor to rotate. The front end of the rotor will vibrate. The bearings at both ends can limit the rotor and filter the vibration at the front end of the rotor. The rear end of the rotor runs smoothly. The gear set does not vibrate when transmitting power. There will be no collision or squeezing between the gears, which reduces the noise of the vacuum pump and extends the service life of the gear set.

[0008] Furthermore, the radial dimension of the first mounting groove is greater than the radial dimension of the second mounting groove. Both the front bearing cap and the rear bearing cap include a fixed end and a clamping end. The clamping end is disposed in the first mounting groove, and the fixed end extends into the second mounting groove and abuts against the bearing.

[0009] By adopting the above technical solution, the fixed end abuts against the bearing to position the bearing in the axial direction.

[0010] Furthermore, the fixed end extends into the rotor cavity from the side near the housing, and the extension abuts against the inner wall of the housing.

[0011] By adopting the above technical solution, the rear bearing cover is radially positioned through the first and second mounting grooves, presses against the bearing near the end face of the bearing, and axially positions the bearing. The extension section cooperates with the rotor cavity inside the housing, ensuring the concentricity of the bearing center and the rotor cavity inside the housing.

[0012] The front bearing cap is radially positioned by the first and second mounting slots, presses against the bearing near the bearing end face, and axially positions the bearing. The extension section mates with the rotor cavity inside the housing, ensuring the concentricity of the bearing center and the rotor cavity inside the housing.

[0013] Furthermore, a connecting hole is provided between the oil pool of the rear end cover and the second mounting groove, and the connecting hole is coaxially arranged with the second mounting groove.

[0014] By adopting the above technical solution, the lubricating oil in the oil tank can enter the second mounting groove through the connecting hole to lubricate the bearing. The oil tank and the bearing share the same oil tank, which reduces the probability of oil leakage.

[0015] Furthermore, a pressure plate is provided at the end of both the front cover and the rear cover away from the housing. The front cover is fixedly connected to the pressure plate, and the rear cover is fixedly connected to the pressure plate.

[0016] Furthermore, the radial dimension of the second mounting groove is larger than the radial dimension of the connecting hole, and the bearing abuts against the end face of the connecting hole near the second mounting groove.

[0017] By adopting the above technical solution, the end face of the second mounting groove in the front cover mates with the front bearing cap to axially position the bearing; the end face of the second mounting groove in the rear cover mates with the rear bearing cap to axially position the bearing.

[0018] Furthermore, one end of the rotor enters the oil sump through a shaft hole, a bearing, and a connecting hole. The gear set includes a first helical gear and a second helical gear, which are respectively mounted on the two rotors and mesh with each other.

[0019] By adopting the above technical solution, the rear end cover is far from the motor. When the motor drives the rotor to rotate and vibrate, the two bearings can reduce the vibration of the rotor and ensure the smooth operation of the gear set.

[0020] Furthermore, both the rear bearing cap and the front bearing cap have double-lip sealing rings installed on the inner side of their fixing parts.

[0021] By adopting the above technical solution, the double-lip seal ring prevents lubricating oil from entering the rotor cavity inside the housing.

[0022] Furthermore, a first sealing ring is provided on the contact surface between the pressure plate on one side and the rear end cover, and a first sealing ring is also provided on the contact surface between the pressure plate on the other side and the front end cover. A second sealing ring is provided on the contact surface between the pressing part of the rear bearing cover and the rear end cover, and a second sealing ring is also provided on the contact surface between the pressing part of the front bearing cover and the front end cover. A third sealing ring is provided on the contact surface between the rear end cover and the housing, and a third sealing ring is provided on the contact surface between the front end cover and the housing.

[0023] By adopting the above technical solution and setting multiple sealing rings, the sealing performance is excellent, ensuring the working quality of the vacuum pump.

[0024] In summary, this utility model has at least one of the following beneficial technical effects:

[0025] 1. By setting a gear set inside the rear cover away from the motor, when the motor rotates, it drives the screw to rotate. The front end of the screw will vibrate. The bearings at both ends can limit the screw and filter the vibration of the front end of the screw. The rear end of the screw runs smoothly. The gear set has no vibration when transmitting power. There will be no collision or squeezing between the gears, which reduces the noise of the vacuum pump and extends the service life of the gear set.

[0026] 2. The front and rear bearing caps abut against the housing on their sides. The rear bearing cap is radially positioned via the first and second mounting grooves, and its end face near the bearing presses against the bearing for axial positioning. The extended section mates with the rotor cavity inside the housing, ensuring the concentricity of the bearing center with the rotor cavity inside the housing. Similarly, the front bearing cap is radially positioned via the first and second mounting grooves, and its end face near the bearing presses against the bearing for axial positioning. The extended section mates with the rotor cavity inside the housing, ensuring the concentricity of the bearing center with the rotor cavity inside the housing. Large circumferential positioning is used, resulting in accurate and stable concentricity positioning. Furthermore, the machining is simple, disassembly and assembly are convenient, and the workpiece is less likely to be damaged.

[0027] 3. The use of multiple sealing rings ensures excellent sealing performance and guarantees the working quality of the vacuum pump. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural diagram of the entire application from the front view;

[0029] Figure 2 This is a top-view cross-sectional structural diagram of the entire application;

[0030] Reference numerals: 100, housing; 110, rotor cavity; 120, rotor; 200, front end cover; 300, rear end cover; 310, first mounting groove; 320, second mounting groove; 330, oil sump; 340, shaft hole; 350, connecting hole; 360, pressure plate; 400, bearing; 500, rear bearing cover; 510, fixed end; 511, extension section; 520, clamping end; 600, front bearing cover; 700, gear set; 710, first helical gear; 720, second helical gear; 810, double lip seal ring; 820, first seal ring; 830, second seal ring; 840, third seal ring. Detailed Implementation

[0031] The technical solutions of this utility model are clearly and completely described below through specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] The following combination Figures 1-2 The present invention will be described in further detail below.

[0033] This embodiment discloses a vacuum pump with high concentricity and stable operation, referring to... Figures 1-2 In this embodiment, the vacuum pump is a screw vacuum pump, including a housing 100, a front cover 200, a rear cover 300, a front bearing cover 600, a rear bearing cover 500, and a gear set 700. A rotor cavity 110 is provided inside the housing 100. The rotor cavity 110 is figure-eight shaped, and a pair of rotors 120 are provided inside the rotor cavity 110. The rotors 120 inside the housing 100 are helical. The front cover 200 and the rear cover 300 are connected to the two sides of the housing 100. The rotors 120 are connected to an external motor at the end of the front cover 200. Both the front cover 200 and the rear cover 300 are provided with a first mounting groove 310 and a second mounting groove that communicate with each other. 320, the first mounting groove 310 is located on the side near the housing 100, the second mounting groove 320 is provided with a bearing 400, the front bearing cover 600 is located in the first mounting groove 310, one end of the front bearing cover 600 abuts against the bearing 400, the front bearing cover 600 is provided with a shaft hole 340, the rear bearing cover 500 has the same structure as the front bearing cover 600, the rear end cover 300 is provided with an oil sump 330, the gear set 700 is located in the oil sump 330, the bearing 400 in the front end cover 200 is a deep groove ball bearing 400, and the bearing 400 in the rear end cover 300 is an angular contact ball bearing 400.

[0034] Thus, the gear set 700 is set inside the rear end cover 300, which is far from the motor. When the motor rotates, it drives the screw to rotate, and the front end of the screw will vibrate. The bearings 400 at both ends can limit the screw and filter the vibration of the front end of the screw, so the rear end of the screw runs smoothly. The gear set 700 has no vibration when transmitting power, and there will be no collision or squeezing between the gears, which reduces the noise of the vacuum pump and extends the service life of the gear set 700.

[0035] Reference Figure 1 In this embodiment, the rotor 120 passes through the bearing 400 and is connected to the gear set 700. The rotor 120, rotor cavity 110, first mounting groove 310, second mounting groove 320 and shaft hole 340 are coaxially arranged. The radial dimension of the first mounting groove 310 is larger than the radial dimension of the second mounting groove 320. The front bearing cover 600 and the rear bearing cover 500 both include a fixed end 510 and a pressing end 520. The pressing end 520 is disposed in the first mounting groove 310, and the fixed end 510 extends into the second mounting groove 320 and abuts against the bearing 400.

[0036] The fixed end 510 extends into the rotor cavity 110 from the side near the housing 100, and the extension section 511 abuts against the inner wall of the housing 100; the radial dimension of the second mounting groove 320 is larger than the radial dimension of the connecting hole 350, and the bearing 400 abuts against the end face of the connecting hole 350 near the second mounting groove 320.

[0037] Thus, the fixed end 510 abuts against the bearing 400, positioning the bearing 400 axially. The end face of the second mounting groove 320 inside the front cover 200 mates with the front bearing cap 600, axially positioning the bearing 400. The end face of the second mounting groove 320 inside the rear cover 300 mates with the rear bearing cap 500, axially positioning the bearing 400. The rear bearing cap 500 is radially positioned via the first mounting groove 310 and the second mounting groove 320, and its end face near the bearing 400 presses against the bearing 400, positioning the bearing 400. The bearing 400 is axially positioned, and the extension section 511 cooperates with the rotor cavity 110 inside the housing 100 to ensure the concentricity of the center of the bearing 400 and the rotor cavity 110 inside the housing 100; the front bearing cover 600 is radially positioned through the first mounting groove 310 and the second mounting groove 320, and presses against the bearing 400 near the end face of the bearing 400 to axially position the bearing 400. The extension section 511 cooperates with the rotor cavity 110 inside the housing 100 to ensure the concentricity of the center of the bearing 400 and the rotor cavity 110 inside the housing 100.

[0038] Reference Figures 1-2 In this embodiment, a connecting hole 350 is provided between the oil pool 330 of the rear end cover 300 and the second mounting groove 320, and the connecting hole 350 and the second mounting groove 320 are coaxially arranged.

[0039] In this way, the lubricating oil in the oil sump 330 can enter the second mounting groove 320 through the connecting hole 350 to lubricate the bearing 400. The oil sump 330 and the bearing 400 share the same oil sump 330, which reduces the probability of oil leakage.

[0040] Reference Figures 1-2 In this embodiment, a pressure plate 360 ​​is provided at the end of the front cover 200 and the rear cover 300 away from the housing 100. The front cover 200 is fixedly connected to the pressure plate 360, and the rear cover 300 is fixedly connected to the pressure plate 360.

[0041] One end of the rotor 120 enters the oil sump 330 through the shaft hole 340, the bearing 400 and the connecting hole 350. The gear set 700 includes a first helical gear 710 and a second helical gear 720. The first helical gear 710 and the second helical gear 720 are respectively disposed on the two rotors 120, and the first helical gear 710 and the second helical gear 720 mesh with each other.

[0042] Thus, the rear cover 300 is far from the motor. When the motor drives the rotor 120 to rotate and vibrate, the two bearings 400 can reduce the vibration of the rotor 120 and ensure the smooth operation of the gear set 700.

[0043] Reference Figures 1-2In this embodiment, double-lip sealing rings 810 are provided on the inner side of the fixing part of the rear bearing cover 500 and the front bearing cover 600. A first sealing ring 820 is provided on the contact surface between the pressure plate 360 ​​on one side and the rear end cover 300, and a first sealing ring 820 is also provided on the contact surface between the pressure plate 360 ​​on the other side and the front end cover 200. A second sealing ring 830 is provided on the contact surface between the pressing part of the rear bearing cover 500 and the rear end cover 300, and a second sealing ring 830 is also provided on the contact surface between the pressing part of the front bearing cover 600 and the front end cover 200. A third sealing ring 840 is provided on the contact surface between the rear end cover 300 and the housing 100, and a third sealing ring 840 is provided on the contact surface between the front end cover 200 and the housing 100.

[0044] In this way, the double-lip seal ring 810 prevents lubricating oil from entering the rotor cavity 110 inside the housing 100. The multiple seal rings provide excellent sealing performance and ensure the working quality of the vacuum pump.

[0045] The implementation principle of this embodiment is as follows:

[0046] When the motor starts, it drives one rotor 120 to rotate. One rotor 120 transmits power to the second rotor 120 through a gear set 700. The gear set 700 is located inside the rear end cover 300, which is far from the motor. When the motor rotates, it drives the screw to rotate. The front end of the screw will vibrate. The bearings 400 at both ends can limit the movement of the screw and filter the vibration at the front end of the screw. The rear end of the screw runs smoothly. The gear set 700 does not vibrate when transmitting power. There is no collision or squeezing between the gears, which reduces the noise of the vacuum pump and extends the service life of the gear set 700.

[0047] The fixed end 510 abuts against the bearing 400 to position the bearing 400 axially. The end face of the second mounting groove 320 inside the front cover 200 mates with the front bearing cap 600 to axially position the bearing 400. The end face of the second mounting groove 320 inside the rear cover 300 mates with the rear bearing cap 500 to axially position the bearing 400. The rear bearing cap 500 is radially positioned via the first mounting groove 310 and the second mounting groove 320, and its end face near the bearing 400 presses against the bearing 400 to axially position the bearing 400. The extension section 511 is connected to the housing. The rotor cavity 110 inside the housing 100 is fitted to ensure the concentricity of the center of the bearing 400 and the rotor cavity 110 inside the housing 100; the front bearing cover 600 is radially positioned by the first mounting groove 310 and the second mounting groove 320, and presses against the bearing 400 near the end face of the bearing 400 to axially position the bearing 400; the extension section 511 fits with the rotor cavity 110 inside the housing 100 to ensure the concentricity of the center of the bearing 400 and the rotor cavity 110 inside the housing 100; multiple sealing rings are provided, providing excellent sealing performance and ensuring the working quality of the vacuum pump.

[0048] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vacuum pump with high concentricity and stable operation, characterized in that, The device includes a housing, a front cover, a rear cover, a front bearing cover, a rear bearing cover, and a gear set. The housing contains a rotor cavity, and a pair of rotors are housed within the rotor cavity. The front and rear covers are abutted on opposite sides of the housing. The rotors are connected to an external motor at the front cover end. Both the front and rear covers have interconnected first and second mounting slots. The first mounting slot is located near the housing, and a bearing is housed in the second mounting slot. The front bearing cover is located within the first mounting slot, with one end abutting against the bearing. A shaft hole is provided within the front bearing cover. The rear bearing cover has the same structure as the front bearing cover. An oil sump is located within the rear cover, and the gear set is housed within the oil sump. The rotors pass through the bearings and connect to the gear set. The rotors, rotor cavity, first mounting slot, second mounting slot, and shaft hole are coaxially aligned.

2. The high concentricity and stable operation vacuum pump according to claim 1, characterized in that, The radial dimension of the first mounting groove is larger than that of the second mounting groove. Both the front bearing cap and the rear bearing cap include a fixed end and a clamping end. The clamping end is disposed in the first mounting groove, and the fixed end extends into the second mounting groove and abuts against the bearing.

3. The high concentricity and stable operation vacuum pump according to claim 2, characterized in that, The fixed end extends into the rotor cavity from the side near the housing, and the extension abuts against the inner wall of the housing.

4. The high concentricity and stable operation vacuum pump according to claim 1, characterized in that, A connecting hole is provided between the oil sump of the rear end cover and the second mounting groove, and the connecting hole is coaxially arranged with the second mounting groove.

5. The high concentricity and stable operation vacuum pump according to claim 1, characterized in that, Both the front cover and the rear cover have pressure plates at the ends furthest from the housing. The front cover and the rear cover are fixedly connected to the pressure plates.

6. The high concentricity and stable operation vacuum pump according to claim 4, characterized in that, The radial dimension of the second mounting groove is larger than the radial dimension of the connecting hole, and the bearing abuts against the end face of the connecting hole near the second mounting groove.

7. The high concentricity and stable operation vacuum pump according to claim 1, characterized in that, One end of the rotor enters the oil sump through a shaft hole, a bearing, and a connecting hole in sequence. The gear set includes a first helical gear and a second helical gear. The first helical gear and the second helical gear are respectively mounted on the two rotors and mesh with each other.

8. The high concentricity and stable operation vacuum pump according to any one of claims 1-7, characterized in that, Both the rear bearing cap and the front bearing cap have double-lip sealing rings installed on the inner side of their fixing parts.

9. The high concentricity and stable operation vacuum pump according to claim 5, characterized in that... A first sealing ring is provided on the contact surface between the pressure plate on one side and the rear end cover, and a first sealing ring is also provided on the contact surface between the pressure plate on the other side and the front end cover. A second sealing ring is provided on the contact surface between the pressing part of the rear bearing cover and the rear end cover, and a second sealing ring is also provided on the contact surface between the pressing part of the front bearing cover and the front end cover. A third sealing ring is provided on the contact surface between the rear end cover and the housing, and a third sealing ring is provided on the contact surface between the front end cover and the housing.

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