KR20000034894A - Roots pump and pump apparatus - Google Patents

Abstract

PURPOSE: A roots pump and a pump device are provided to reduce a foot space by disposing a plurality of shafts to be mounted with rotors in a lengthwise direction and achieve smooth pump operation by easily converting a driving force of a rotation driving device into a rotation force of rotors without distortion of shafts by integrally forming the a root pump with the rotation driving device. CONSTITUTION: A roots pump includes a casing for defining at least one pump chamber (2a,4a) having a suction hole and a discharge hole, and rotors(9-12) disposed in the pump chamber and mounted on a plurality of parallel shafts(7,8) with a small interval each other, wherein two or more of the rotors constitute a group and sequentially operate in a lengthwise direction. The roots pump is mounted adjacent to a driving main body(20), and a rotation driving device(M) protruded from the driving main body and having a rotation driving shaft. Between the roots pump and the rotation driving device, a pump device is mounted and includes a driving gear(13) fixed on the driving shaft of the rotation driving device, and a timing gear train of driven gears(14) fixed on each shaft of the roots pump to be driven by the driving gears.

Description

ROOTS PUMP AND PUMP APPARATUS}

The present invention relates to a root pump driven by a rotary drive device such as a motor, and a pump device in which the rotary drive device and the root pump are integrated.

In commercial single stage pumping units, the single stage root pump is integrated with the motor. Here, in the single stage route pump, one pump chamber provided with an intake port and an exhaust port in a casing is comprised. Two sets of rotors are arranged in the pump chamber, and each rotor is mounted on two axes parallel to each other so as to rotate while maintaining a slight distance from each other. In the casing, the inlet port of the pump chamber is opened, and the exhaust port is opened. Moreover, the drive shaft which protrudes from the drive body of a motor and rotates is connected to one of each axis | shaft of a single stage root pump. The drive gear is fixed to the tip of one shaft of the single stage root pump connected to the drive shaft of the motor, and the drive gear meshes with the driven gear fixed to the tip of the other shaft of the single stage root pump to transmit rotation.

By using such a single stage pumping device, for example, when one room is to be in a vacuum and a pressure reducing chamber, the inlet of the single stage root pump is opened in the room, and the exhaust port is opened in the atmosphere and the like. Then, the single stage root pump is driven by the motor. As a result, the rotors rotate while maintaining a small distance from each other in the pump chamber of the single-stage root pump, so that a pumping operation is performed in the pump chamber of the single-stage root pump, and the air in the room is discharged to the atmosphere to make the interior a pressure reducing chamber. Can be.

Moreover, in the commercial multistage pump apparatus, the multistage root pump is integrated with the motor. Here, in the multi-stage root pump, a plurality of pump chambers each having an intake port and an exhaust port in the casing are configured in parallel. In each pump chamber, two sets of rotors are arranged, and each rotor is mounted on two axes parallel to each other so as to rotate while maintaining a slight distance from each other. In the casing, the inlet port of the pump chamber at the foremost end is opened. In addition, a partition with a relatively long shaft length is formed between the pump chamber at the front end and the pump chamber at the rear end, and the exhaust port of the pump chamber at the front end is sequentially connected to the inlet port of the pump chamber at the rear end while rotating the inside of the partition wall about 180 °. have. And the exhaust port of the pump chamber of the last stage is opened. Moreover, the drive shaft which protrudes from the drive body of a motor and drives rotationally is connected to one of each axis | shaft of a multistage root pump. The drive gear is fixed to the front end of one shaft of the multistage root pump connected to the drive shaft of the motor, and the drive gear is engaged with the driven gear fixed to the front end of the other shaft of the multistage root pump to transmit rotation.

Using such a multistage pumping device, for example, when one room is set to a vacuum and the decompression chamber is used, in the multistage root pump, the inlet of the pump chamber at the foremost stage is opened in the room and the exhaust port of the pump chamber at the last stage is opened. Is opened to the atmosphere or the like. Then, the multistage root pump is driven by the motor. As a result, the rotors rotate in the pump chambers of the multi-stage root pumps while maintaining a small distance from each other, so that pumping is sequentially performed in each pump chamber, and the air in the room is discharged to the air cylinder, and the room is moved to the decompression chamber. can do.

However, in the conventional single stage and multistage pump apparatuses, in consideration of the lubricity of the drive gear and the driven gear, the plurality of axes are arranged in the transverse direction (horizontal direction) to operate each rotor sequentially in the transverse direction. For this reason, in these pump apparatuses, installation becomes difficult due to the enlargement of the installation place (foot space).

This invention is made | formed in view of the said prior art, Comprising: It aims at providing the root pump and pump apparatus for ensuring the ease of installation by aiming at reducing a foot space.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the multistage pump apparatus of Embodiment 1. FIG.

FIG. 2 is a cross-sectional view of the multistage pump apparatus of Embodiment 1 as viewed from the arrow direction of II-II in FIG. 1. FIG.

3 is a cross-sectional view of the multistage pump apparatus of Embodiment 1, as viewed from the arrow direction of III-III of FIG.

4 is a cross-sectional view of the multistage pump apparatus of Embodiment 1 as viewed from the arrow direction IV-IV of FIG. 1.

FIG. 5 is a cross-sectional view of the multistage pump apparatus of Embodiment 1 as viewed from the arrow direction of V-V in FIG. 1. FIG.

6 is a cross-sectional view of the multistage pump apparatus of Embodiment 1. FIG.

FIG. 7 is a sectional view similar to FIG. 5, related to the multistage pump apparatus of Embodiment 2. FIG.

* Description of the symbols for the main parts of the drawings *

P: multi-stage root pump 17a, 2b, 4b: inlet port

2c, 4c, 16b: exhaust ports 2a, 4a: pump chamber

3a: air passage

1 to 6, 1c, 16, 17: casing (1-6: 1st-6th cylinder block, 1c: front plate, 16: first side plate, 17: second side plate)

7, 8: 1st, 2nd axis 9-12: 1st, 2nd rotor

16a, 17b: communication groove M: rotary drive (motor)

20: drive main body 13: drive gear (lower gear)

14: driven gear (upper gear)

The root pump of the present invention has a casing constituting at least one pump chamber having an inlet port and an exhaust port, and a rotor disposed in the pump chamber, mounted on a plurality of axes parallel to each other, and rotating while maintaining a slight gap therebetween. In the root pump, the rotor is composed of a pair of two or more, each of the rotor is characterized in that the acting sequentially in the longitudinal direction.

In this root pump, the rotors are sequentially operated in the longitudinal direction by arranging a plurality of axes in the longitudinal direction (vertical direction). For this reason, this root pump can aim at reduction of a foot space compared with the conventional thing which operated each rotor sequentially in the horizontal direction.

In addition, the pump apparatus of the present invention, the rotational drive device having a drive main body and a drive shaft protruding from the drive main body and rotates to the root pump of the present invention is provided adjacent, between the root pump and the rotary drive device. And a timing gear train comprising a drive gear fixed to the drive shaft of the rotary drive device and a driven gear fixed to each of the shafts of the root pump and driven by the drive gear.

This pump apparatus integrates the root pump of the present invention with a rotary drive such as a motor. In this pump apparatus, the driving force transmitted from the drive shaft of the rotary drive device is converted into the timing gear train consisting of the drive gear and the driven gear and the rotation of each rotor in each axis. Since the rotational gears such as a motor and the timing gear train are close to each other, the driving force of the rotational drive is converted to the rotation of all the rotors in each pump chamber in that the root pump is not affected by the torsion of each axis. It is easy and pump action is easy to be made smoothly.

In this way, in the pump apparatus of the present invention in which the root pump is integrated with the rotary drive device, the lower gear made of a drive gear or a driven gear which is located at the lower end and can be at least partially immersed in lubricating oil is made of metal, and above the lower gear. It is characterized in that the upper gear consisting of a driven gear or a driving gear positioned is sequentially driven by a different material.

For this reason, even if each rotor is operated in a longitudinal direction sequentially, even if an upper gear is not immersed in lubricating oil, it does not interfere with the lubricity of an upper gear. And the upward gear is comprised so that it may follow sequentially with a heterogeneous material. For example, the upper gear meshed with the metal lower gear is made of resin, and the upper gear meshed with the upper gear is made of metal. For this reason, in this pump apparatus, since metals do not mesh together, the noise at the time of operation can be made small. In addition, since the resins do not mesh with each other, there is no problem in strength, and there is no fear of deterioration of the pump performance due to a change in the distance between the rotors due to thermal expansion.

In the pump apparatus of the present invention, when there are a plurality of pump chambers, the inlet port of the pump chamber at the foremost end is opened at the position farthest from the timing gear train, and the exhaust port of the pump chamber at the last end is located at the position closest to the timing gear train. It is characterized by being opened.

In this case, the lubricating oil of the timing gear train does not splash in the room where the inlet port of the pump chamber at the foremost opening is opened, and the pressure can be reduced while maintaining the environment with respect to the room or the like.

EMBODIMENT OF THE INVENTION Hereinafter, Embodiment 1, 2 which actualized this invention is described, referring drawings.

(Embodiment 1)

In this multistage pump apparatus, as shown in FIG. 1, the multistage root pump P is integrated with the motor M. As shown in FIG. Here, in the multistage root pump P, the first to sixth cylinder blocks 1 to 6 are sequentially stacked while interposing an O-ring between them, and these are front plates formed on the first cylinder block 1 side. It is fastened by the through-bolt which is not shown with 1c. These first to sixth cylinder blocks 1 to 6 and the front plate 1c constitute a part of the casing.

In the first to fifth cylinder blocks 1 to 5, two horizontal shaft holes are formed so as to be parallel to each other in the vertical direction, and the first shaft 7 and the second shaft 8 are accommodated in each shaft hole. It is. In each shaft hole of the first cylinder block 1, bearing devices 1a and 1b for bearing the first and second shafts 7 and 8 are provided, which are covered by the front plate 1c.

As shown in FIG. 2, one pump chamber 2a is formed concave from the front in the 2nd cylinder block 2, and the groove which accommodates the said O-ring is formed in the periphery of the pump chamber 2a. . In the pump chamber 2a, the 1st rotor 9 attached to the 1st shaft 7 located below and the 2nd rotor 10 attached to the 2nd shaft 8 located upward are arrange | positioned, have. The first and second rotors 9 and 10 are rotated while maintaining a slight distance from each other. The second cylinder block 2 has an inlet port 2b which communicates with the pump chamber 2a, sucks air by rotation of the first and second rotors 9 and 10, and an exhaust port 2c for discharging air. It penetrates horizontally.

Also in the fourth cylinder block 4 shown in FIG. 1, as shown in FIG. 4, one same pump chamber 4a is formed concave from the front, and in the pump chamber 4a, the same first and second rotors 11, 12) is arranged. In the fourth cylinder block 4, the same inlet port 4b and exhaust port 4c are formed to penetrate horizontally. However, the shaft length of the pump chamber 2a at the front end of the second cylinder block 2 is longer than the shaft length of the pump chamber 4a at the rear end of the fourth cylinder block 4. Moreover, the shaft length of the 1st, 2nd rotors 9-12 is also different according to the shaft length of each of these pump chambers 2a, 4a.

As shown in FIG. 3, the air passage 3a penetrates horizontally in the third cylinder block 3 shown in FIG. 1.

In each of the shaft holes of the fifth cylinder block 5 shown in FIG. 1, bearing devices 5a and 5b for bearing the first and second shafts 7 and 8 are provided.

1 and 5, the gear chamber 6a is formed concave from the front in the sixth cylinder block 6, and the groove for accommodating the O-ring is recessed around the gear chamber 6a. Formed. In the gear chamber 6a, a driving gear (lower gear 13) of steel is fixed to the first shaft 7. In addition, a driven gear (upper gear) 14 made of nylon is fixed to the second shaft 8. The driven gear 14 meshes with the drive gear 13 and constitutes a timing gear train together with the drive gear 13. In addition, the drive body 20 of the motor M is fixed to the sixth cylinder block 6 by a bolt (not shown), and the first shaft 7 protrudes from the drive body 20 to rotate and drive. It is connected by the drive shaft of M) and the seam which is not shown in figure. In the lower part of the gear chamber 6a, the lubricating oil which immerses the lower part of the drive gear 13 is sealed to the height of h from the bottom face of the gear chamber 6a.

On the side surfaces of the second to fourth cylinder blocks 2 to 4, as shown in FIGS. 2 to 4 and 6, the first and second side plates 16 and 17 are not shown through the gaskets 18 and 19. It is fastened by bolts. These 1st, 2nd side plates 16 and 17 comprise the remainder of a casing.

As shown in Figs. 2, 3 and 6, the second plate 17 is horizontally formed with an inlet port 17a communicating with the inlet port 2b of the second cylinder block 2, and the first plate ( 16, a communication groove 16a communicating with the exhaust port 2c of the second cylinder block 2 and the air passage 3a of the third cylinder block 3 is formed concave. 3, 4 and 6, the second plate 17 communicates with the air passage 3a of the third cylinder block 3 and the intake port 4b of the fourth cylinder block 4. The communicating groove 17b is formed concave, and the exhaust plate 16b communicating with the exhaust port 4c of the fourth cylinder block 4 is formed horizontally through the first plate 16.

In the case of using a multistage pump device configured as described above, for example, when one room is to be in a vacuum state and a decompression chamber, as shown in FIG. 6 in the multistage root pump P, the second plate is connected via a hose or the like. While opening the inlet port 17a of the door 17 in the room, the exhaust port 16b of the first plate 16 is opened through the hose or the like. Then, the multistage root pump P is driven by the motor M. FIG. Thereby, since the 1st, 2nd rotors 9-12 rotate in each pump chamber 2a, 4a of the multi-stage root pump P, keeping a small space | interval from each other, the pump is sequentially pumped in each pump chamber 2a, 4a. The operation is performed, and the air in the room can be discharged to the atmosphere to make the room a decompression chamber.

In the meantime, in this multistage pump apparatus, the driving force transmitted from the drive shaft of the motor M is the timing gear train which consists of the drive gear 13 and the driven gear 14, and the angles in the 1st, 2nd shafts 7 and 8, respectively. It is converted to rotation of the rotors 9 to 12. Since the motor M and the timing gear train are close to each other, the driving force of the motor M is not affected by the torsion of the first and second shafts 7, 8 in the multi-stage root pump P. It is easy to be converted to rotation of all the rotors 9-12 in the pump room 2a, 4a, and a pump action is easy to be performed smoothly.

In this multistage pump apparatus, the rotors 9 to 12 are sequentially operated in the longitudinal direction by arranging the first and second shafts 7 and 8 in the longitudinal direction, so that the respective rotors are sequentially operated in the horizontal direction. Compared with the conventional one, the foot space can be reduced, and the ease of installation can be ensured.

Furthermore, in this multistage pump apparatus, the lower part of the drive gear 13 in the timing gear train is immersed in the lubricating oil, and the lubricating oil raised as if the driving gear 13 is wound up is supplied to the driven gear 14. For this reason, each rotor 9-12 is made to act sequentially in a longitudinal direction, and even if the driven gear 14 is not immersed in lubricating oil only by enclosing lubricating oil only from the bottom of the gear chamber 6a to the height of h, the driven gear It does not interfere with lubricity of (14). And since the thing made of nylon is used as the driven gear 14 which meshes with the forced drive gear 13, since these do not make metal mesh with each other, the noise at the time of operation can be made small. In addition, since the resins are not engaged with each other, there is no problem in strength, and there is no fear of deterioration of the pump performance due to the change in the interval between the rotors 9 to 12 due to thermal expansion.

In this multistage pump apparatus, the inlet port 2b of the pump chamber 2a in the front end is opened at the position farthest from the timing gear train, and the exhaust port 4c of the pump chamber 4a in the rear end is closest to the timing gear train. Since it is open at, the lubricating oil of the timing gear train does not splash in a room where the inlet port 2b of the pump chamber 2a of the front end is opened, and the pressure can be reduced while maintaining the environment appropriately to the room.

(Embodiment 2)

In this multi-stage pump apparatus, as shown in Fig. 7, a three-row rotor is employed. In this case, the timing gear train in the gear chamber 30a of the gear cylinder block 30 consists of three gears 34 to 36. That is, the drive gear (lower gear 34) is fixed to the 1st shaft 31, and the driven gear (upper gear 35, 36) is fixed to the 2nd, 3rd shaft 32, 33, and these gears 34 36 are sequentially inclined in the longitudinal direction. The driven gear 35 and the driven gear 36 are forced, and the drive gear 34 is made of nylon. The other configuration is the same as that of the first embodiment.

Also in this multistage pump apparatus, the same effect as that of Embodiment 1 can be achieved.

In addition, this invention can also make a pump room one single stage pump apparatus, or three or more multistage pump apparatus.

As described above, the root pump of the present invention has a casing constituting at least one pump chamber having an intake port and an exhaust port, and is disposed in the pump chamber and mounted on a plurality of axes parallel to each other to maintain a slight distance from each other. In the root pump having a rotor that rotates while the rotor is two or more pairs, each of the rotor acts sequentially in the longitudinal direction. In this root pump, each rotor is operated in the longitudinal direction by arranging a plurality of axes in the longitudinal direction (vertical direction). Thus, this root pump is compared with the conventional one in which each rotor is sequentially operated in the horizontal direction. As a result, the foot space can be reduced.

In addition, the pump apparatus of the present invention, the rotational drive device having a drive main body and a drive shaft protruding from the drive main body and rotates to the root pump of the present invention is provided adjacent, between the root pump and the rotary drive device. The timing gear train is provided with a drive gear fixed to the drive shaft of the rotary drive device, and a driven gear fixed to each of the shafts of the root pump and driven by the drive gear. This pump apparatus integrates the root pump of the present invention with a rotary drive such as a motor. In this pump apparatus, the driving force transmitted from the drive shaft of the rotary drive device is converted into the timing gear train consisting of the drive gear and the driven gear and the rotation of each rotor in each axis. Since the rotational gears such as a motor and the timing gear train are close to each other, the driving force of the rotational drive is converted to the rotation of all the rotors in each pump chamber in that the root pump is not affected by the torsion of each axis. It is easy and pump action is easy to be made smoothly.

In this way, in the pump apparatus of the present invention in which the root pump is integrated with the rotary drive device, the lower gear made of a drive gear or a driven gear which is located at the lower end and can be at least partially immersed in lubricating oil is made of metal, and above the lower gear. The up gear which consists of a driven gear or a drive gear which is located is comprised so that it may follow sequentially with another material. For this reason, even if each rotor is operated in a longitudinal direction sequentially, even if an upper gear is not immersed in lubricating oil, it does not interfere with the lubricity of an upper gear. And the upward gear is comprised so that it may follow sequentially with a heterogeneous material. For example, the upper gear meshed with the metal lower gear is made of resin, and the upper gear meshed with the upper gear is made of metal. For this reason, in this pump apparatus, since metals do not mesh together, the noise at the time of operation can be made small. In addition, since the resins do not mesh with each other, there is no problem in strength, and there is no fear of deterioration of the pump performance due to a change in the distance between the rotors due to thermal expansion.

In the pump apparatus of the present invention, when there are a plurality of pump chambers, the inlet port of the pump chamber at the foremost end is opened at the position farthest from the timing gear train, and the exhaust port of the pump chamber at the last end is located at the position closest to the timing gear train. It is made open. In this case, the lubricating oil of the timing gear train does not splash in the room where the inlet port of the pump chamber at the foremost opening is opened, and the pressure can be reduced while maintaining the environment with respect to the room or the like.

Claims (4)

A root pump having a casing constituting at least one pump chamber having an inlet and an exhaust port, and a rotor disposed in the pump chamber and mounted on a plurality of shafts parallel to each other and rotating while maintaining a slight gap therebetween. The rotor is composed of a pair of two or more, each of the rotor is a root pump, characterized in that the acting sequentially in the longitudinal direction. The root pump according to claim 1, wherein a rotation driving device having a drive main body and a drive shaft protruding from the drive main body and driven to rotate is provided adjacent to each other, and between the root pump and the rotation driving device, And a timing gear train comprising a drive gear fixed to the drive shaft and a driven gear fixed to each of the shafts of the root pump and driven by the drive gear. 3. The lower gear according to claim 2, wherein the lower gear made of a driving gear or driven gear which is located at the lower end and is at least partially immersed in lubricating oil is made of metal, and the upper gear made of the driven gear or driving gear which is located above the lower gear is made of a different material. Pump apparatus, characterized in that configured to follow sequentially. 4. The pump chamber according to claim 2 or 3, wherein when there are a plurality of pump chambers, the inlet port of the pump chamber at the foremost end is opened at the position farthest from the timing gear train, and the exhaust port of the pump chamber at the last end is closest to the timing gear train. Pump apparatus characterized in that the opening is made from.