JPH0144912B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a device for adjusting the relative rotational phase of a pair of rotors of a Roots-type fluid feeder used as a supercharger, feeder, compressor, pump, etc. .

Prior Art A roots-type fluid feeder rotates a pair of two-lobed rotors, which are cocoon-shaped as a whole with two-lobed blades extending outward in the semi-longitudinal direction from the rotational axis, in opposite directions inside a casing. This allows fluid to be delivered.

In this Roots-type fluid feeder, a pair of rotors must rotate in opposite directions synchronously, so a timing gear is fixed to each rotor, and each rotor is controlled based on the meshing of these timing gears. The rotors are configured to rotate while defining mutual rotational phases.

By the way, when assembling such a Roots-type fluid feeder, in order to fix a pair of timing gears to each rotor in a mutually engaged state, it is first necessary to align both rotors with appropriate relative rotational phases.

As a device for this purpose, for example, as shown in FIG. 7, two rotors 100 and 102 are rotatably supported, and one rotor (first rotor)
A positioning shaft is fitted into the through hole 104 formed in the rotor 100, thereby fixing the rotational phase of the first rotor 100, while the blades 108 of the second rotor 102
The second rotor 1 is brought into contact with the blades 112 of the first rotor 100 through the feeler gauge 110.
By fixing the rotational phase of 02, the two rotors 10
A device is used that matches the relative rotational phase of 0.102.

Problems to be Solved by the Invention This device fixes the rotational phase of the first rotor 100 and the second rotor 102 so that a certain clearance is generated between the first rotor 100 and the second rotor 102 at a certain rotational phase. However, in this device, the blades 112 of the rotors 100, 102,
Due to variations in cross-sectional shape, dimensions, etc. of 108,
There is a problem in that the relative rotational phase of the rotors 100 and 102 deviates from an appropriate rotational phase.

For example, as shown in FIG.
The width dimension of the blade 108 of No. 2 is ΔW with respect to the reference width W.
If the blade 1 of the second rotor 102 is larger than
08 to the first rotor 10 via the feeler gauge 110
0, the second rotor 10
The rotational phase of No. 2 is shifted clockwise in the figure by Δθ from the proper phase θ. in this case,
Although a certain clearance is secured between the first rotor 100 and the second rotor 102 at a specific rotational phase where phase matching is performed, an appropriate clearance is not secured throughout one revolution of the rotor;
As shown in FIG. 9, in some cases, a problem arises in which the rotors 100 and 102 interfere with each other at a phase rotated by a certain angle from a specific rotational phase at which phase matching was performed.

Furthermore, as shown in FIG.
The rotation axis of 0,102 is the axis of rotation of those blades 112,1
A similar problem occurs when the width direction is offset from the plane including both center lines of 08. For example, as shown in the figure, the rotation axis of the first rotor 100 is
When the first rotor 100 is fixed at the phase θ, the blade 112b is shifted by an angle β from the phase θ.
Therefore, the second rotor 10
The phase of 2 will also shift accordingly. This problem similarly occurs when the rotational axis of the second rotor 102 is misaligned.

Another limitation of this device is that it requires phasing of the rotor at a certain rotational phase. The clearance between the rotors 100 and 102 is defined by a certain relative rotational phase (specifically, as shown in FIG. 116 and 118 are rotated approximately 45 degrees from the mutually orthogonal phase). Therefore, it is necessary to select such a phase for phase matching.

Means for Solving the Problems The present invention has been made to solve these problems, and its gist is to conceptually describe a rotor relative rotation phasing device as shown in FIG. As shown in (a) a main body 3 that rotatably supports the first rotor 1 and the second rotor 2 with their rotational axes being parallel to each other; and (b) the first rotor 1.
and are provided in the main body 3 at positions close to the second rotor 2, respectively, and the rotors 1, 2
(c) a first guide 4 and a second guide 5 that extend straight in a direction perpendicular to the rotation axis of the first guide 4;
The first contact surface 6 is provided so as to be slidable on the first rotor 1 and is parallel to the rotation axis of the first rotor 1 and forms a constant angle θ with respect to the first guide 4. When the guide 4 is moved along the guide 4, the first contact surface 6 simultaneously contacts the two blades 7, 7 of the first rotor 1, thereby changing the rotational phase of the first rotor 1 between the two blades 7, 7. A first movable body 10 fixed at a phase such that a plane 8 including both center lines of the rotor 7 includes the rotation axis of the first rotor 1 and forms the constant angle θ with respect to a plane 9 parallel to the first guide 4.
and (d) is provided so as to be slidable on the second guide 5 and forms the constant angle θ with respect to a plane 11 that is parallel to the rotational axis of the second rotor 2 and perpendicular to the first guide 4. A second abutting surface 12 is provided, and when the second abutting surface 12 is moved along the second guide 5, the second abutting surface 12 is provided.
, the two blades 13, 1 of the second rotor 2
3 at the same time, the rotational phase of the second rotor 2 is changed so that the plane 14 including both the center lines of the two blades 13, 13 includes the rotation axis of the second rotor 2 and is connected to the first guide 4. The second moving body 15 is fixed at a rotational phase that is a position rotated in the opposite direction to the first rotor 1 by the above-mentioned constant angle θ from the orthogonal plane 11.
The reason is that it is structured to include the following.

Function and Effect In such a device, when the first movable body 10 is moved along the first guide 4, the first movable body 10 is moved at a position where the first contact surface 6 makes a constant angle θ with respect to the first guide 4. It contacts two blades 7 of one rotor 1 at the same time. As a result, the rotational phase of the first rotor 1 is
Including the rotation axis of the first rotor 1 and the first guide 4
The phase is fixed at a phase rotated by an angle θ from a plane 9 parallel to , that is, a phase in which a plane 8 including both center lines of each blade 7 forms an angle θ with respect to the plane 9.

Similarly, when the second movable body 15 is moved along the second guide 5, the second movable body 15 is moved at a position where the second contact surface 12 is at a constant angle θ with respect to the plane 11 perpendicular to the first guide 4. The second rotor 2 is brought into contact with the two blades 13 of the rotor 2 at the same time, and the second rotor 2 is
The first rotor 1 is fixed at a phase in which a plane 14 including both center lines thereof is rotated by an angle θ with respect to the plane 11 in the opposite direction to the first rotor 1. That is, the two rotors 1 and 2 are fixed with a phase difference of 90 degrees.

In this way, according to the present device, the rotational phases of the two rotors are fixed separately and independently so that they have a predetermined constant relative phase. For this reason, the two rotors are matched to the appropriate relative rotational phase without being affected by variations in the shape, cross-sectional dimensions, etc. of the other rotor, and the clearance between these rotors is also maintained appropriately throughout one rotation. It will be preserved.

If the clearance between the rotors is maintained properly,
It becomes possible to set the clearance small at the design stage, which has the effect of increasing the feeding efficiency of the Roots type fluid feeder.

Furthermore, unlike the above-mentioned devices, this device does not use the clearance that should be created between each rotor as a reference when matching the rotational phases of a pair of rotors, so it is possible to freely select the rotational phase of the rotors to be matched. It has the advantage of being able to In addition, a guide that serves as a reference for phase alignment,
Since all contact surfaces are straight, they can be processed and formed with high precision, and the work is simple as all that is required is to move the movable body during phase alignment work. It has the following features.

Embodiments Next, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 3, reference numeral 17 denotes the main body of the phase matching device, which consists of a supporting member 18 having a U-shaped cross section and a plate 19 disposed on the upper part of the support member 18, and a first and second rotor 20, 21 disposed inside the supporting member 18. is now being accommodated. As will be clear from the explanation that follows, plate 19 is a part of the Roots-type supercharger;
It is also used as part of the main body 17 of the phase matching device. Further, two fitting holes 22 are formed in the lower part of the support member 18, and the rotor 20,
The shaft portion 23 of 21 is rotatably fitted. On the other hand, the plate 19 is fixed to the upper surface of the support member 18 in a positioned state by a pin 24, and two fitting holes 2 are formed approximately in the center of the plate 19.
6 is formed, and the rotor 2 is inserted into this fitting hole 26.
The boss portions 28 of Nos. 0 and 21 are fitted. This plate 19 further includes a bearing 3.
2 is incorporated, and the shaft portions 30 of the rotors 20 and 21 are rotatably supported.

As shown in FIG. 2, on the bottom of the support member 18, first and second guide surfaces 34 and 36 that extend straight are parallel to each other at positions close to the first rotor 20 and the second rotor 21. It is set in. Inside these guide surfaces 34 and 36, right triangular first and second movable bodies 3 are provided.
8 and 40 are disposed on the sliding surfaces 42 and 44 so as to be able to slide on the guide surfaces 34 and 36 a certain distance. These two moving bodies 38, 4
0 has elongated holes 46 and 48, and these elongated holes 46 and 4
By tightening the bolts 50 and 52 inserted through the movable bodies 38 and 40, the movable bodies 38 and 40 are fixed to the bottom of the support member 18.

The first movable body 38 has a first abutment surface 54 that forms an angle θ with the first guide surface 34, and the first movable body 38 moves up and down in FIG. 2 along the first guide surface 34. When the movement operation is performed, this first contact surface 54 simultaneously contacts the two blades 58 of the first rotor 20 and first contacts a plane 66 that includes both center lines of the two blades 58 of the first rotor 20. It is oriented in a direction parallel to plane 54. That is, the rotational phase of the first rotor 20 is fixed at a phase in which the plane 66 makes an angle θ with respect to a plane 68 that includes the rotational axis of the first rotor 20 and is parallel to the first guide surface 34. In addition,
Let the angle of the apex of the first moving body 38 facing the sliding surface 42 be γ.

On the other hand, the slope of the second moving body 40 is the second guide surface 3
a second contact surface 56 forming an angle γ with respect to 6;
When the second movable body 40 is operated to move along the second guide surface 36, its second contact surface 56 simultaneously contacts the two blades 62 of the second rotor 21 to change the rotational phase of the second rotor 21. , a plane 70 including both center lines of the two blades 62 of the second rotor 21 is fixed in phase with the second guide surface 36 at an angle γ.
Note that at this time, the plane 70 is inclined at an angle θ with respect to the plane 72 that is perpendicular to the first guide surface 34 .

Next, using such a device, two rotors 2
The procedure for matching the relative rotational phases of 0 and 21 will be explained. First, the shaft portion 30 of each one of the rotors 20 and 21
is fitted into the bearing 32 of the plate 19, while fitting into the bottom fitting hole 22 of the support member 18 that supports the other shaft part 23, and in that state, the plate 19
are positioned and fixed to the upper surface of the support member 18 using the pin 24, and then the timing gears 74, 76 are fitted into the shaft portions 30 of the respective rotors 20, 21.

Subsequently, the first movable body 38 is moved along the first guide surface 34, and the first contact surface 54 is brought into contact with each of the two blades 58 of the first rotor 20 at the same time. If the bolt 50 is tightened in this state, the first movable body 38 is fixed to the lower part of the support member 18, and at the same time, the first rotor 20 is fixed to the first guide surface 34.
The phase is fixed at a phase rotated counterclockwise by an angle θ from the above-mentioned plane 68 parallel to .

Similarly, the second movable body 40 is moved along the second guide surface 36 to bring its second contact surface 56 into contact with each of the two blades 62 of the second rotor 21 simultaneously, and then the bolt 52 is brought into contact with each of the two blades 62 of the second rotor 21. is tightened to fix the second moving body 40. As a result, the second rotor 21 is moved at an angle θ from a surface 72 perpendicular to the first guide surface 34 in a direction opposite to the first rotor 20 (clockwise).
The phase is fixed at the rotated phase.

The two-leaf rotors of a Roots-type supercharger are rotated synchronously in opposite directions, maintaining a relative phase difference of 90 degrees. Therefore, the above-mentioned fixed phase is such that the planes 66 and 70 including the center lines of each of the two blades 58 and 62 are rotated by the same angle θ in opposite directions from the planes 68 and 72 that are perpendicular to each other. This results in an appropriate relative rotational phase in the leaf rotor.

In this way, when the relative rotational phase of the rotors 20 and 21 is fixed, each timing gear 7
4 and 76 are meshed with each other in a state that eliminates backlash (a state in which torque is applied in the driving direction to the timing gear on the driving side, and torque in the opposite direction is applied to the timing gear on the driven side), and in that state, each timing Gears 74, 76 and rotors 20, 21
A pin hole is machined and formed between the shaft portion 30 and the shaft portion 30. Then, by driving the pin 78 into this pin hole, the rotors 20, 21 and the timing gears 74, 76 are integrated, and the rotors 20, 21 are rotated through these gears 74, 76 under an appropriate relative rotational phase. It becomes connected.

Next, by tightening the bolts 80 through washers, the shaft portions 30 of the rotors 20, 21 and the timing gears 74, 76 become irremovable, and the assembly of the rotor assembly 82 including the plate 19 is completed. .

The rotor assembly 82 is then removed from the support member 18 and assembled directly into the casing of the Roots supercharger.

In this way, according to the device of this example, the two rotors 20 and 21 are fixed separately and independently so that they have predetermined relative rotational phases. That is, unlike the above-mentioned device, when fixing the rotational phase of one rotor, the other rotor is not used as a reference. Therefore, the two rotors will not deviate from the appropriate relative rotational phase due to variations in the cross-sectional shape or dimensions of the rotors, and therefore the first rotor 20 and the second rotor 21 during one rotation can be This also reduces the variation in clearance.

Further, in the device of this example, guide surfaces 34, 36, abutment surface 54,
56 is a straight plane, so it is easy to process these with high precision, and the device itself has a simple configuration, so it can be manufactured at low cost, and in addition, it is easy to operate. be.

Furthermore, since this device does not directly use the clearance to be created between the rotors 20 and 21 as a reference for phase alignment, the rotational phase of the rotors 20 and 21 to be phase aligned can be adjusted arbitrarily to make it easier for the operator to perform the task. It has the advantage of being selectable.

Next, another embodiment of the present invention will be described based on FIG.

In this example, the second guide surface 84 is provided in a direction perpendicular to the first guide surface 34. As shown in the figure, the second movable body 85 has a second contact surface 86 at an angle θ with respect to the second guide surface 84 that is perpendicular to the first guide surface 34.
Therefore, when the second movable body 85 is moved and its second contact surface 86 is brought into contact with the two blades 62 of the second rotor 21 at the same time, the second rotor 21 The first rotor 20 is rotated by an angle θ from a plane 72 perpendicular to the first guide surface 34 in a direction opposite to the first rotor 20, and is fixed in the same phase as in the first embodiment.

Further, FIG. 6 shows the first and second moving bodies 9
0 and 92 are rectangular ones having straight first and second sliding surfaces 93 and 94 and first and second contact surfaces 95 and 96. In this case, the first rotor 20 is the first moving body 9
0, the phase of the second rotor 21 is fixed in a direction perpendicular to the first guide surface 34, and the phase of the second rotor 21 is fixed in a direction parallel to the first guide surface 34. That is, the first rotor 20 is fixed at a phase rotated counterclockwise by an angle θ (90 degrees) from a plane 68 parallel to the first guide surface 34, and the second rotor 21
are fixed at a phase rotated in the opposite direction by an angle θ (90 degrees) from a plane 72 perpendicular to the first guide surface 34.

Note that the second moving body is divided along the two-dot chain line 97 in FIG. 6, and the second moving body 98 is moved along the second guide surface indicated by the two-dot chain line 97. is also possible. in short,
In the present invention, it is sufficient that the second contact surface forms a predetermined constant angle with respect to the first guide, and the angle of the second guide, the shape of the second movable body, etc. can be determined as appropriate. It is.

Furthermore, the first and second guides do not necessarily have to be flat as in the embodiments described above, but may be of any type as long as they can guide the first and second movable bodies straight. Moreover, although the above example has been explained using a Roots type supercharger as an example, the present invention can also be applied to other Roots type compressors, blowers, pumps, etc.

In addition, although illustration of each example is omitted, the present invention can be implemented with various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram conceptually showing the configuration of the present invention. FIG. 2 is a plan sectional view of a phase matching device according to an embodiment of the present invention, and FIG. 3 is a front sectional view of the phase matching device. Figure 4 is Figure 2,
FIG. 4 is a plan view of the phase matching device shown in FIG. 3; Fifth
The figure is a sectional plan view of a phase matching device according to another embodiment of the invention, and FIG. 6 is a sectional plan view of a phase matching device according to still another embodiment of the invention. 7th
FIG. 11 are explanatory diagrams for explaining the problems of the conventional phase matching device. 17: Main body, 18: Support member, 20: First rotor, 21: Second rotor, 34: First guide surface (first guide), 36, 84: Second guide surface, 38,
90: First moving body, 40, 85, 92, 98: Second moving body, 54, 95: First contact surface, 56, 8
6, 96: second contact surface, 58, 62: blade.

Claims (1)

[Scope of Claims] 1. First and second rotors, which are provided with two blades extending radially outward from the rotation axis and are cocoon-shaped as a whole, are rotated in opposite directions inside a casing. A device for adjusting the relative rotational phase of a pair of rotors of a Roots-type fluid feeder that feeds fluid by, said first and second rotors in a state in which their rotational axes are parallel to each other. a main body that rotatably supports the first and second rotors; first and second guides that are provided on the main body at positions close to the first and second rotors and extend straight in a direction perpendicular to the rotation axes of the rotors; The first contact surface is provided to be slidable on the first guide, and includes a straight first contact surface that is parallel to the rotational axis of the first rotor and forms a constant angle with respect to the first guide. , when the first rotor is moved along the first guide, the first contact surface simultaneously contacts the two blades of the first rotor, thereby changing the rotational phase of the first rotor at both centers of the two blades. a first movable body whose plane including a line is fixed at a phase that includes the rotation axis of the first rotor and forms the constant angle with respect to a plane parallel to the first guide; and a first movable body that slides on the second guide. a second contact surface that is movably provided and that is parallel to the rotational axis of the second rotor and that forms the constant angle with respect to a plane that is perpendicular to the first guide; When the second rotor is moved, the second contact surface simultaneously contacts the two blades of the second rotor, thereby changing the rotational phase of the second rotor so that a plane including both center lines of the two blades is in contact with the second blade. a second moving body that includes the rotational axis of the second rotor and is fixed at a rotational phase that is a position rotated by the certain angle from a plane perpendicular to the first guide in a direction opposite to that of the first rotor; A relative rotation phase matching device for a rotor in a Roots-type fluid feeder, characterized in that: