JPS63277881A - Root's blower having plural rotors - Google Patents

Abstract

PURPOSE:To enhance the efficiency of a blower, by forming plural rotors in a hollow type and a discharge groove, which discharges fluid taken into from a fluid intake hole, in the rotor and driving it by a timing set gear. CONSTITUTION:Plural rotors 3, formed into hollow shape, are driven by a timing set gear 21 in a casing 2 feeding out fluid. The rotor 3 forms a discharge groove 10, which discharges fluid taken into from a fluid intake hole 7, in a direction of the rotor 3 in its axial line. The timing set gear 21 forms its gear part movable in the direction of rotation for a boss part 23. Accordingly, the fluid to be fed is prevented from its leakage from a clearance in a slide contact part of the rotor by enabling the fluid to be discharged from a discharge groove 9 by rotating the rotor 3 with centrifugal force.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention pumps out fluid by meshing and rotating a set of two approximately cocoon-shaped biplane rotors at appropriate timing. The present invention relates to a Roots type blower having a biplane rotor that provides good sealing between the rotor and the casing without requiring additional installation of a sealing material, and has a good rogue balance.

(Prior Art) Conventionally, a Roots-type blower, which pumps out fluid by rotating a set of two cocoon-shaped biplane rotors, meshes with each other at an appropriate time, as shown in Figs. 4 and 5. It exhibits a structure.

That is, the Roots-type blower shown in FIG. 5 is a two-leaf type, in which two rotors 32 are meshed with each other in a casing 31 and rotated together. It is shaped like a leaf, and is also commonly known as a two-leaf cocoon pump.

This two-leaf Roots type blower has the advantage of superior airtightness and less pressure loss than, for example, a gear pump. Also, compared to a single-leaf Wankel type blower, it has the advantage of better rotational balance and less pressure fluctuation.

On the other hand, the Roots type blower shown in FIG. 6 is a three-leaf type, and like the two-leaf type, two rotors 34 are formed to mesh with each other in a casing 33 and rotate together. It has a roughly cocoon-like shape with three leaves, and is also commonly referred to as a three-leaf cocoon pump.

This three-leaf Roots blower has the advantage of less pressure fluctuation than the two-leaf Roots blower. However, if we increase the number of leaves any further, the structure will become more complicated.
Generally, two-lobed type and three-lobed type are used.

(Problems to be Solved by the Invention) <Problems of the Prior Art> However, in the case of the above-mentioned two-leaf type or three-leaf type Roots type blower, the gap between the casings 31, 33 and the apex of the rotor 32, 34 is Alternatively, there is always some gap between the contact surfaces of the rotors 32 and 34 in order to maintain a rotatable state.

Therefore, there is a problem in that pressure loss occurs due to fluid leaking from the gap, and attempts have been made to prevent this pressure loss by installing additional sealing material at the apex of the rotor 32, 34, etc. There are still problems with material deterioration and cost increases.

Also, since the rotor 32, 34 itself has the shape described above, the rotational balance is better than that of a single-leaf Wankel blower, but there is still some imbalance in the rotation, which may cause vibrations and some There was also a problem that led to noise generation.

On the other hand, in order to mesh and rotate the two cocoon-shaped biplane rotors 32 and 34 together at appropriate timing, the rotation periods of the two rotors 32 and 34 are usually synchronized using a timing setting gear (not shown) or the like. The timing is set accordingly.

However, in this case, if there is a slight difference in timing between the two rotors 32 and 34, pressure loss may occur, or if the difference becomes large, the rotors 32 and 34
This may lead to damage to the gear itself, and the timing setting gear must be molded very precisely, and a lot of time is also spent on adjusting the timing. Therefore, there was a problem that led to an increase in manufacturing costs.

Technical Problem> Therefore, in view of the above-mentioned problems, the present invention improves the degree of sealing between the casing and the rotor or between the rotors in a roots-type blower having a biplane rotor, and improves the rotor rotation. This was created with the aim of improving the balance between blowers and increasing the efficiency of the blower, while still being able to offer it at the same price as conventional blowers.

[Structure of the Invention] (Means for Solving the Problems) This invention provides a system in which a set of two approximately cocoon-shaped biplane rotors are meshed and rotated together at appropriate timings by a timing setting gear. In the Roots type blower, which sends out fluid by rotating the rotor, the biplane rotor is formed hollow, and a fluid intake hole is opened up to the hollow part on the front surface of the rotor, and the multiplane rotor is hollow. A discharge groove is formed in the axial direction of the biplane rotor on the outer surface of the apex of the biplane rotor to communicate with the hollow part and discharge the fluid taken in from the fluid intake hole, and the timing setting gear is incorporated in the boss part and the boss part. The above-mentioned problem is solved by making the gear part movable in the rotational direction relative to the boss part and fixed at an appropriate position.

(Function) Roots type blower having a biplane rotor according to the present invention
In the casing, the two approximately cocoon-shaped biplane rotors l and Ifi are meshed and rotated together at appropriate timing by timing setting gears, and fluid is sent out.

At that time, by making the biplane rotor hollow, the inertia of the rotor is reduced and rotational balance is improved, and from the fluid intake hole provided on the front surface of the rotor,
A part of the fluid pumped out by this rotor is introduced into the hollow part, and the introduced fluid is discharged from a discharge groove formed in the rotor's axial direction on the outer surface of the rotor's multi-leaf apex by centrifugal force caused by the rotation of the rotor. The fluid is discharged, and a shield wall is formed between the rotor and the casing or between the rotors to seal the fluid.

On the other hand, by moving and fixing the timing setting gear as appropriate in the rotational direction relative to the boss, the rotation period of the two substantially cocoon-shaped biplane rotors can be set to the optimum period for sending out the fluid. Set as appropriate.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

That is, the reference numeral 1 shown in the figure is a roots-type blower, and this blower 1 operates a set of approximately cocoon-shaped biplane rotors 3 in a casing 2 at appropriate timings using a timing setting gear 21. They are formed so that fluid can be delivered by meshing and rotating them together.

In the illustrated blower 1, two three-leaf type biplane rotors 3 are arranged as a set, and the casing 2 is
Therefore, the cross section is cylindrical with an elliptical cavity, and the biplane rotor 3 itself has a side surface shape in which three approximately cocoon-shaped leaf portions 4 are evenly distributed in the radial direction.
is hollow and reduces the inertial force when the biplane rotor 3 rotates, thereby improving rotational balance.

The biplane rotor 3 has a cross section consisting of a three-leaf cocoon-shaped portion and a valley portion in which the cocoon-shaped portions are connected by a substantially R curve to form a continuous curve, and the substantially R curve portion is , the outer surface of the leaf-like portion 4 of the biplane rotor 3 to be meshed is in sliding contact with each other, and the leaf-like portion 4 is a hollow columnar body, and a rotating shaft 11 is formed at the axis thereof. ing.

A fluid intake hole 7 is provided on the rotational front side surface 5 of the biplane rotor 3 to send a portion of the fluid to the hollow portion 6 of each leaf-like portion 4.

In addition, a discharge groove 9 is formed in the apex outer surface 8 of each leaf-like portion 4 of the biplane rotor 3 in the direction of the rotation axis of the biplane rotor 3, and an appropriate number of discharge holes 10 are formed in the bottom of the discharge groove 9. The discharge groove 9 and the hollow portion 6 are formed to communicate with each other.

In this case, the number of leaf-like portions 4 of the biplane rotor 3 may be any number as long as it is plural.

The two biplane rotors 3 formed in this way are arranged in parallel in the vertical direction, for example, and are rotatably supported by the rotating shaft 11.

Then, when one valley portion of one biplane rotor 3 faces downward, the fluid intake hole 7 of the leaf-shaped portion 4 facing upward of the other biplane rotor 3 comes into sliding contact with the valley portion at an appropriate timing. The rotation timing is adjusted by the timing setting gear 21 so that the rotation timing is set and rotated at the same period and in the opposite direction.

As mainly shown in FIG. 4, this timing setting gear 21 has two substantially annular timing gears 22 serving as gear portions, and the timing setting gear 21 is configured by engaging concentrically with the timing gears 22, thereby setting the timing. Boss part 2 into which gear 22 is installed
3, each of which has a boss portion 23 on the rotating shaft 11 of each biplane rotor 3 arranged in the vertical direction.
They are connected one by one by.

The timing gear 22 and the boss portion 23 are formed such that the timing gear 22 is movable relative to the boss portion 23 in the rotational direction.

The boss portion 23 is provided with screw holes 24 at an appropriate number of locations, and the timing gear 22 is provided with elongated holes 25 that are long in the rotational direction at positions corresponding to the screw holes 24 of the boss portion 23. The boss part 23 is not visible and the adjustment screw 26
The timing gear 22 and the boss portion 23 can be fixed at appropriate positions by inserting the timing gear 22 into the elongated hole 25, screwing it into the screw hole 24, and tightening it.

Further, the two timing gears 22 have the same number of teeth and are in mesh with each other, thereby causing the biplane rotors 3 to rotate in opposite directions at the same period (rotational speed).

In this case, in the illustration, the lower timing gear 2
The above screw hole 24, elongated hole 25, and adjustment screw 26 are installed only in 2 parts.
However, it may be provided on the upper timing gear 22 portion, or may be provided on both parts.

The biplane rotor 3 and the timing setting gear 21 formed in this way are disposed within the casing 2, as described above, and the timing setting gear 21 is disposed between the biplane rotor 3 and the casing side wall 14. There is.

A drive section 15 is connected to one of the boss sections 23 of the timing setting gear 21 (in the illustration, the lower boss section 23), and the biplane rotor 3 is driven and rotated by this drive section 15. It is.

Further, a fluid outlet 13 is opened on the side surface of the casing 2 on the opposite side of the fluid inlet 12.
3, the fluid population 12 is made larger, and the opening area is actually approximately 1.5 times larger. By doing so, there is almost no resistance when introducing the fluid, and when the fluid is sent out, the discharge pressure can be increased.

It goes without saying that the present invention is not limited to the embodiments described above and the shapes shown in the drawings. Further, thick arrows in the figure indicate the rotation direction of the rotor 3, white arrows indicate the direction of the fluid being sent out, and thin arrows indicate the flow of the fluid discharged from the discharge groove 9 into the hollow portion 6 of the rotor 3. It is something.

[Effects of the invention] This invention configured as described above has two parts in the casing 2.
A set of approximately cocoon-shaped biplane rotors 3 are meshed and rotated together at appropriate timings by a timing setting gear 21 to form a roots type blower that sends out fluid. A set of two substantially cocoon-shaped biplane rotors 3 are meshed and rotated together at appropriate timing to send out fluid.

Then, while forming the biplane rotor 3 to be hollow,
A fluid intake hole 7 is provided in a hollow portion 6 on the rotating front side surface 5.
and the outer surface 8 of the multi-lobed apex of this rotor 3.
A discharge groove 1.0 is formed in the axial direction of the biplane rotor 3 to communicate with the hollow portion 6 and discharge the fluid taken in from the fluid intake hole 7, and the timing setting gear 21 is connected to the boss portion 2.
3 and a gear part incorporated in this boss part 23,
The gear part is made movable in the rotational direction with respect to the boss part 23, and is formed so that it can be fixed at an appropriate position, so that the biplane rotor 3 is hollow, so that the inertia of the rotor 3 can be reduced. Good rotational balance can be achieved.

Moreover, a part of the fluid pumped out by the rotor is introduced into the hollow portion 6 from a fluid intake hole provided in the rotational front side surface 5 of the rotor 3, and the introduced fluid is transferred to each of the rotors 3. Since the discharge can be carried out through the discharge groove 9 formed on the outer surface 8 of the leaf apex in the axial direction of the rotor 3 by the centrifugal force caused by the rotation of the rotor 3, the discharge can be carried out between the rotor 3 and the casing 2, or between the rotor 3 and the rotor. A shield wall made of the fluid can be formed on the entire surface of the sliding contact area between the biplane rotor 3 and the rotor 3 whenever the biplane rotor 3 is rotating, so that the fluid to be sent out will not leak from the gap in the sliding contact area. Almost completely sealed. Therefore, pressure loss due to leakage from the sliding contact portion is completely eliminated, allowing efficient fluid delivery.

On the other hand, the timing setting gear 21 can be fixed by moving the gear part appropriately in the rotational direction with respect to the boss part 23.
The rotation period of each approximately cocoon-shaped biplane rotor 3 can be appropriately set to be the optimum period for sending out the fluid,
This facilitates tuning of the period and thereby enables more efficient fluid delivery.

As explained above, according to the present invention, in a roots-type blower having a biplane rotor, the sealing degree between the casing and the rotor or between the rotors is improved, and the rotor rotation is well balanced. , the efficiency of the blower can be increased, and since the biplane rotor 3 itself has excellent rotational balance, there is no noise and vibration, and no extra drive energy is required.
Structurally, it has various excellent effects, such as the fact that it does not require the addition of any new parts and can therefore be offered at the same price as the conventional one.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view, FIG. 2 is a front sectional view, FIG. 3 is a sectional view along the line ■-■ in FIG. 2, and FIG. 5 is a cutaway perspective view of a main part showing a timing setting gear, and FIGS. 5 and 6 are side sectional views showing a conventional Roots-type blower. DESCRIPTION OF SYMBOLS 1... Blower 12... Casing, 3... Biplane rotor, 4... Leaf-like part, 5... Rotating front surface, 6... Hollow part, 7... Fluid intake Hole, 8... Apex outer surface, 9... Discharge groove, 10... Discharge hole, 11...
・Rotation axis, 12...Fluid population, 13...Fluid outlet,
DESCRIPTION OF SYMBOLS 14... Casing side wall, 15... Drive part, 21... Timing setting gear, 22... Timing gear, 23... Boss part, 24... Screw hole, 25...
・Long hole, 26...adjustment screw, 31...casing, 32...rotor, 33...
・Casing, 34...rotor. Patent applicant Takeshi Iwabuchi
1 Shigai Figure 4 Figure 6

Claims (1)

[Claims] 1. In a Roots-type blower that sends out fluid by meshing and rotating a set of two substantially cocoon-shaped biplane rotors together at appropriate timings using a timing setting gear within a casing, the biplane rotor is formed hollow. At the same time, the front surface of the rotor is provided with a fluid intake hole up to the hollow part, and the outer surface of the apex of each leaf of the rotor is provided with a fluid intake hole.
A discharge groove is formed in the axial direction of the biplane rotor to communicate with the hollow portion and discharge the fluid taken in from the fluid intake hole, and the timing setting gear includes a boss portion and a gear portion incorporated in the boss portion, A Roots-type blower having a biplane rotor, characterized in that the gear part is movable in the rotational direction with respect to the boss part, and is formed to be fixed at an appropriate position.