JP3139905U - 4 and 6 roots vacuum pumps - Google Patents

Abstract

A compact four-stage and six-stage roots vacuum pump using a gear system for transmitting driving force from a motor device to a first rotor shaft and a second rotor shaft is provided.
A roots rotor in which a first stage chamber a and a third stage chamber c, a second stage chamber b and a fourth stage chamber d are arranged in parallel, and are respectively inserted into the first stage chamber and the third stage chamber. 1 and a second rotor shaft 23 having a Roots rotor inserted into the second stage chamber and the fourth stage chamber, respectively, are freely rotatable by housings 25 and 29 attached to the front and rear of the casing 1. In the supported four-stage roots vacuum pump, the timing gear 28 is fixed to the end of each first rotor shaft, and the timing gear 32 is fixed to the end of each second rotor shaft, so that one timing of the first rotor shaft is fixed. An intermediate gear 36 that meshes with the gear 28 and one timing gear 32 of the second rotor shaft is rotatably provided, and an output shaft of the motor device 42 is coupled to the end of the second rotor shaft via a coupling 41.
[Selection] Figure 3

Description

  The present invention relates to a 4-stage and 6-stage roots type vacuum pump used as a vacuum source for a vacuum drying apparatus, a vacuum packaging apparatus, a conveying apparatus for adsorbing and transferring an article, and the like.

  Patent Document 1 describes an “intercoolerless air-cooled four-stage roots vacuum pump” according to the present applicant. The vacuum pump includes a front-side first-stage compression chamber and a rear-side third-stage compression chamber, a front-side second-stage compression chamber, and a rear-side fourth-stage compression in a casing having a suction port and a discharge port. The chambers are arranged in parallel, and are inserted into the first rotor shaft having a roots rotor inserted into the first stage compression chamber and the third stage compression chamber, respectively, and into the second stage compression chamber and the fourth stage compression chamber, respectively. A second rotor shaft provided with a roots rotor is rotatably supported by housings attached to the front and rear of the casing, and timing gears that mesh with each other are fixed to end portions of the first rotor shafts that protrude from the front housing. A timing gear that meshes with each other is fixed to an end portion of the second rotor shaft, a first pulley is protruded from an end portion of one of the first rotor shafts protruding from the rear housing, and a second gear is connected to an end portion of the one second rotor shaft. A pulley and a motor side drive A structure in which a V-belt is stretched between the pulley and the first pulley and the second pulley, and the air sucked from the suction port is discharged from the discharge port by rotating the first rotor shaft and the second rotor shaft by driving the motor; Has been.

However, since the conventional roots-type vacuum pump is a drive transmission system using a V-belt, it takes time to adjust the tension when the V-belt is loosened and to replace the V-belt. Further, the V belt is worn by frictional contact between the V belt and the pulley, and fine powder is generated. Such a fine powder is not preferable in an environment requiring a clean atmosphere such as a clean room because it causes contamination when it floats in the room.
Japanese Patent No. 2618826

  An object of the present invention is to provide a compact four-stage and six-stage roots vacuum pump that uses a gear system to transmit driving force from a motor device to a first rotor shaft and a second rotor shaft.

In order to achieve the above object, the device according to claim 1 is characterized in that a front first stage chamber, a rear third stage chamber, and a front second stage are provided in a casing in which a suction port and a discharge port are formed. A first rotor shaft having a root rotor inserted in the first stage chamber and the third stage chamber, respectively, and a second stage chamber and a fourth stage chamber. By rotating the first rotor shaft and the second rotor shaft in directions opposite to each other, the second rotor shaft having the roots rotor to be inserted is rotatably supported by housings attached to the front and rear of the casing, respectively. In the four-stage roots-type vacuum pump provided to discharge the air sucked from the suction port from the discharge port,
The timing gear is fixed so as to mesh with the end portions of the first rotor shafts protruding from the front housing, and the timing gear is fixed so as to mesh with the end portions of the second rotor shafts. An intermediate gear meshing with one timing gear of the shaft and one timing gear of the second rotor shaft is rotatably provided on the front housing, and the end of the first rotor shaft or the second rotor shaft protruding from the rear housing It is characterized in that it is provided so as to connect the output shaft of the motor device to the part via a coupling.

  In order to achieve the same object, the device according to claim 2 includes a front first stage chamber, a third stage chamber, and a rear fifth stage chamber in a casing in which a suction port and a discharge port are formed. The second stage chamber on the front side, the fourth stage chamber, and the sixth stage chamber on the rear side are arranged in parallel, and the root rotor inserted into the first stage chamber, the third stage chamber, and the fifth stage chamber is provided. A first rotor shaft and a second rotor shaft having a root rotor inserted into the second stage chamber, the fourth stage chamber, and the sixth stage chamber are rotatably supported by housings respectively attached to the front and rear of the casing. The timing gear is fixed so as to mesh with the ends of the first rotor shafts protruding from the front housing, and the timing gear is fixed so as to mesh with the ends of the second rotor shafts. Meshes with one timing gear of the shaft and one timing gear of the second rotor shaft An intermediate gear is rotatably provided in the front housing, and is provided so as to connect the output shaft of the motor device to the end of the first rotor shaft or the second rotor shaft protruding from the rear housing through a coupling, The motor device is driven to rotate the first rotor shaft and the second rotor shaft in opposite directions so that air sucked from the suction port is discharged from the discharge port. .

  The four-stage and six-stage roots type vacuum pumps connect the output shaft of the motor device to the second rotor shaft (or the first rotor shaft) via a coupling, and drive the first rotor shaft and the second rotor shaft. By adopting a gear system for power transmission, a compact structure can be achieved and maintenance can be easily performed. And, there is no need for belt tension adjustment and replacement work in the drive transmission system using the conventional V belt, and there is no advantage that the fine powder generated by the wear of the V belt is scattered around and contaminates the environment. is there.

  The best mode of the present invention will be described below with reference to the drawings. 1 is a side view of a four-stage roots-type vacuum pump according to the first embodiment, FIG. 2 is a front view of the same, FIG. 3 is a cross-sectional view of the same main part, and FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 5 is an explanatory view showing the arrangement of the timing gear and the intermediate gear, and FIG. 6 is a cross-sectional view of the main part of the six-stage roots vacuum pump according to the second embodiment.

(Example 1)
As shown in FIG. 1, the four-stage roots-type vacuum pump P according to the first embodiment is mounted on a base 45 together with a motor device 42. As shown in FIG. 4, the casing 1 of this vacuum pump P includes a suction side block 5 in which a suction port 6 is formed on the left side surface 2 a of the central block 2 provided with a mounting portion 3 for fixing to a base 45. A discharge side block 8 having discharge ports 9 is attached to the right side surface 2b of the central block 2 and are provided integrally. Inside the casing 1, a front first stage chamber a and a rear third stage chamber c, and a front second stage chamber b and a rear fourth stage chamber d are arranged in parallel ( FIG. 3). In other words, the center line passing through the first stage chamber a and the rear third stage chamber c and the center line passing through the second stage chamber b and the rear fourth stage chamber d are arranged in parallel. Has been.

  A cover 11 provided with a connection port 12 communicating with the suction port 6 and a recess 13 that forms a part of a passage 19 described later is attached to the suction side block 5. Further, the discharge side block 8 is provided with a cover 14 provided with a connection port 15 communicating with the discharge port 9 and a recess 16 forming a part of a passage 19 described later. 18 is a passage connecting the first stage chamber a and the second stage chamber b, 19 is a path connecting the second stage chamber b and the third stage chamber c, and 20 is a passage between the third stage chamber c and the fourth stage chamber d. It is a passage that communicates.

  A pair of first rotor shafts 21 and 21 having a trilobe root rotor 22 inserted into the first stage chamber a and the third stage chamber c, respectively, and the second stage chamber b and the fourth stage chamber d, respectively. The pair of second rotor shafts 23, 23 provided with the three-lobe root rotor 24 is a bearing 26 mounted on a gear housing (front housing) 25 attached to the front portion 1 a of the casing 1, and the casing 1. It is rotatably supported by a bearing 30 mounted on a motor side housing (rear housing) 29 attached to the rear portion 1b. A shaft seal seal 27 is mounted on the inner side of the gear housing 25, and a shaft seal seal 31 is mounted on the inner side of the motor side housing 29.

  Note that the ratio of the lengths of the first-stage and third-stage root rotors 22 and the second-stage and fourth-stage root rotors 24 is about 1: (0.6 to 0.7).

  Timing gears 28 are fixed to end portions of the first rotor shafts 21 so as to mesh with each other, and timing gears 32 are fixed to end portions of the second rotor shafts 23 so as to mesh with each other. Reference numeral 36 denotes an intermediate gear that meshes with one timing gear 28 of the first rotor shaft 21 and one timing gear 32 of the second rotor shaft 23 (FIG. 5). The intermediate shaft 35 for fixing the intermediate gear 36 is rotatably provided by two bearings 34 attached to the gear housing 25. Reference numeral 38 denotes a cover attached to the front portion of the gear housing 25.

  As shown in FIG. 1, the output shaft 42 a of the motor device 42 is connected to the end 23 a of the second rotor shaft 23 protruding from the motor-side housing 29 via a coupling 41. Reference numeral 40 denotes a silencer attached to the connection port 15 of the casing 1.

  Thus, the second rotor shaft 23 is directly rotated by driving the motor device 42, and the rotational force is transmitted to the first rotor shaft 21 via the timing gear 32, the intermediate gear 36, and the timing gear 28 to transmit the first rotor. A four-stage roots vacuum pump P according to the first embodiment is configured in which the air sucked from the suction port 6 is discharged from the discharge port 9 by rotating the shaft 21 and the second rotor shaft 23 in opposite directions.

Next, the operation of the four-stage roots vacuum pump P according to the first embodiment will be described.
The second rotor shaft 23 is rotated by driving the motor device 42, and the rotational force is transmitted to the first rotor shaft 21 via the timing gear 32, the intermediate gear 36, and the timing gear 28. As a result, each of the first rotor shaft 21 and the second rotor shaft 23 rotates in the opposite direction to hold the first stage chamber a at a negative pressure, so that the surrounding air passes from the suction port 6 to the first stage chamber. a sucked into a. The sucked air is sequentially compressed from the first stage chamber a through the passages 18 to 20 to the fourth stage chamber d, and is discharged from the silencer 40 to the atmosphere through the discharge port 9. The

Embodiment 2
The six-stage roots vacuum pump P ′ according to the second embodiment has a structure in which a fifth-stage chamber e and a sixth-stage chamber f are added based on the structure of the above-described four-stage roots vacuum pump P.
Therefore, the same main components as those of the four-stage root-type vacuum pump P are diverted from the description of the four-stage root-type vacuum pump P, and the description is omitted. Only the portion (labeled with 100s) will be described.

  That is, as shown in FIG. 6, the casing 101 of this six-stage Roots type vacuum pump P ′ has a suction side block 105 formed with a suction port 106 on one side surface of the central block 102, on the other side surface of the central block 102. The discharge side block 108 in which the discharge port 109 is formed is attached and provided integrally. Inside the casing 101 are a front first stage chamber a, an intermediate third stage chamber c and a fifth stage chamber e, a front second stage chamber b, an intermediate fourth stage chamber d and a sixth stage chamber. f is arranged in parallel.

  A cover 111 provided with a connection port 112 communicating with the suction port 106 and recesses 113a and 113b forming part of passages 118b and 118d to be described later is attached to the suction side block 105. The discharge side block 108 is provided with a cover 114 provided with a connection port 115 communicating with the discharge port 109 and recesses 116a and 116b forming part of passages 118b and 118d described later. 118a is a passage connecting the first stage chamber a and the second stage chamber b, 118b is a path connecting the second stage chamber b and the third stage chamber c, and 118c is a passage between the third stage chamber c and the fourth stage chamber d. A passage 118d is a passage that connects the fourth-stage chamber d and the fifth-stage chamber e, and 118e is a passage that connects the fifth-stage chamber e and the sixth-stage chamber f.

  A pair of first rotor shafts 121 having a trilobal root rotor 122 inserted into the first stage chamber a, the third stage chamber c, and the fifth stage chamber e, respectively, the second stage chamber b, and the fourth stage chamber d. And the pair of second rotor shafts 123 having the trilobal roots rotor 124 inserted into the sixth stage chamber f, respectively, and a bearing 26 attached to the gear housing 25 attached to the front portion 101a of the casing 101. The bearings 30 mounted on the motor side housing 29 attached to the rear portion 101b of the casing 101 are rotatably supported.

  The ratio of the lengths of the first stage, the third stage and the fifth stage root rotor 122 and the second stage, the fourth stage and the sixth stage root rotor 124 is 1: (0.7 To 0.8): about (0.5 to 0.6).

  The output shaft 42 a of the motor device 42 is connected to the end 123 a of the second rotor shaft 123 protruding from the motor-side housing 29 via the coupling 41.

  The operation of the six-stage roots vacuum pump P ′ according to the second embodiment having such a configuration is similar to that of the four-stage roots vacuum pump P according to the first embodiment, and thus the description thereof is omitted.

Side view of the four-stage roots-type vacuum pump according to the first embodiment Same front view Same as above, cross section AA line sectional view of FIG. Explanatory drawing showing arrangement of timing gear and intermediate gear Cross-sectional view of essential parts of a six-stage roots-type vacuum pump according to the second embodiment

Explanation of symbols

P ... 4 stage root type vacuum pump a ... 1st stage chamber b ... 2nd stage chamber c ... 3rd stage chamber d ... 4th stage chamber 1 ... Casing 6 ... · Suction port 9 ··· Discharge port 21 ··· First rotor shaft 22 · · · Roots rotor 23 · · · Second rotor shaft 23a · · · End 24 · · · Roots rotor 25 · · · Housing for gear (front side) Housing)
28, 32 ... Timing gear 29 ... Motor side housing (rear housing)
36 ... Intermediate gear 41 ... Coupling 42 ... Motor device 42a ... Output shaft P '... Six-stage roots type vacuum pump e ... Fifth stage chamber f ... Sixth stage Chamber 101 ... Casing 106 ... Suction port 109 ... Discharge port 121 ... First rotor shaft 122 ... Roots rotor 123 ... Second rotor shaft 123a ... End 124 ... Roots rotor

Claims (2)

Inside the casing forming the suction port and the discharge port, the front first stage chamber and the rear third stage chamber, the front second stage chamber and the rear fourth stage chamber are arranged in parallel, The casing includes a first rotor shaft provided with a root rotor inserted into the first stage chamber and the third stage chamber, and a second rotor shaft provided with a root rotor inserted into the second stage chamber and the fourth stage chamber, respectively. Are provided so as to be freely rotated by housings attached to the front and rear of each of the first and second rotor shafts, and to rotate the first and second rotor shafts in opposite directions to discharge air sucked from the suction ports from the discharge ports. In a four-stage roots vacuum pump,
The timing gear is fixed so as to mesh with the end portions of the first rotor shafts protruding from the front housing, and the timing gear is fixed so as to mesh with the end portions of the second rotor shafts. An intermediate gear meshing with one timing gear of the shaft and one timing gear of the second rotor shaft is rotatably provided in the front housing, and the end portion of the first rotor shaft or the second rotor shaft protruding from the rear housing A four-stage roots-type vacuum pump characterized in that the output shaft of the motor device is connected to the motor through a coupling.   Inside the casing formed with the suction port and the discharge port, the front first stage chamber, the third stage chamber and the rear fifth stage chamber, the front second stage chamber, the fourth stage chamber and the rear first stage chamber A six-stage chamber is arranged in parallel, a first rotor shaft having a root rotor inserted into the first-stage chamber, the third-stage chamber, and the fifth-stage chamber, respectively, a second-stage chamber, a fourth-stage chamber, and a first-stage chamber Second rotor shafts having roots rotors respectively inserted into the six-stage chambers are rotatably supported by housings respectively attached to the front and rear of the casing, and are mutually attached to end portions of the first rotor shafts protruding from the front housing. The timing gear is fixed so as to mesh with each other, and the timing gear is fixed so as to mesh with each other at the end of each second rotor shaft, so that one timing gear of the first rotor shaft and one timing gear of the second rotor shaft are fixed to each other. A meshing intermediate gear is rotatably provided in the front housing, The output shaft of the motor device is connected to the end of the first rotor shaft or the second rotor shaft protruding from the housing on the side through a coupling, and the first rotor shaft and the second rotor are driven by driving the motor device. A six-stage roots-type vacuum pump, which is provided so that air sucked from a suction port is discharged from a discharge port by rotating shafts in opposite directions.

Images