JPS6187989A - Rotary air compressor - Google Patents

Abstract

PURPOSE:To obtain a rotary air compressor in which the occurrence of vibration and noise is few and which has a good compression efficiency by arranging even numbers of rotors having ellipsoidal shape so as to enable contact rotation and making each rotor rotate synchronously in the same direction. CONSTITUTION:This rotary air compressor has four rotors 2, and each rotor is arranged in the position corresponding to each vertex of a quadrilateral, and is so constituted that each rotor can rotate keeping contact with each other. The shape of each rotor is formed in an approximate ellipse, and the portion surrounded by all the rotors forms a working chamber. While each rotor is driven by a set of timing gears 4 to rotate synchronously in the same direction, since the working chamber is formed in the portion surrounded by rotors, it is not necessary to use such a housing that has complicated curved surfaces, and further the compressing action is made smooth.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to rotary air compressors.

C-back In technology] Conventionally known rotary air compressors, for example, rotate a rotor with extensible blades on the side of a disk inside a cylinder by an eccentric shaft, and compress the air provided in the cylinder. The air inside the cylinder is compressed along the direction of rotation by operating the intake and exhaust valves in synchronization with the rotation of the rotor.
It has a structure of L.

Air compressors with this type of structure (1) tend to generate vibration and noise due to the eccentric rotation of the rotor; (2) have expandable and contracting blades, making the structure complex and prone to failure; (
3) There are problems such as difficulty in designing and processing due to the complicated inner shape of the cylinder.

Also, Special Publication No. 47-32843 (Patent No. 682047)
No.) The patent publication describes that a 2 fl/J irregularly shaped piston is rotated in contact with each other in a partially constricted housing with an oval cross section, and the distance between the housing and the piston is determined by the above 4j3. The invention of a rotary piston machine for compressing air is described.

In this case as well, in the above structure, the inner surface of the housing and the curved surface shape of the threaded piston are complex, and it is particularly difficult to design and precisely machine the two toothed pistons so that they rotate while maintaining mutual contact. There is a problem.

[Purpose of the invention]

The present invention overcomes the above-mentioned problems, and its purpose is to reduce vibration and noise, make it easier to process,
Moreover, rotary air pressure with excellent compression efficiency fiiiti
It consists in assuming (Jζ) li-.

3. 11th section of Jingmei] 4. Fi
F+K2 The explanation is as follows. In other words, it has four rotors with parallel i-planes (approximate ellipses formed by a pair of circular arcs and a pair of circular arcs that are joined together), and these four When the rotor is rotated, Ll-Y make an angle of 90 degrees, and Ll-F
iQj J″Z）Fu!S′ζ axis is arranged so that it can be rotated, and by rotating synchronously in the abutment, % + r, and Ll directions, the space surrounded by the fallen plate and the four LSI-ta is compressed and fluctuated. This makes it possible to realize an air compressor with well-balanced parts and low vibration and noise.

〔Example〕

1 to 5 show one embodiment of the present invention. Figure 1 is a cross-sectional view of the rotary air compressor, Figure 2 is a cross-sectional view of the rotary air compressor;
Figures 4 to 4 are A in Figure 1 showing various aspects of the rotor.
- A 1vi view. FIG. 5 shows a rotor synchronous drive structure, and is a sectional view taken along line BB in FIG. 1.

1a and 1b are side plates, which are fixed via a spacer 11 so that their opposing flat inner surfaces are parallel to each other to form one housing. 2a to 2d are rotors, each consisting of four pieces. has an approximately elliptical cross section made by combining two circular arcs, and both side surfaces (both end surfaces) are formed into flat surfaces.

As shown in FIG. 6, the shape of the rotor is a combination of two cylindrical parts cut out along a plane.

The arc of the part cut out for the rotor (indicated by hatching) in the W1 plane of this cylinder is A of the circumference of the cross-sectional circle.
Must.

If the radius of the L4Ji-plane circle is k, the length of the cut straight part is 2a, and the thickness of the cut part is b, then the interior angle θ is 90°, so R= a +
There is a function (system) of b a7b=1+JT.

The four rotors fit between the side plates 1a and 1b of the housing, and the rotors 6a-b d are provided at the center of the rotors.
, are rotatably supported in bearings on two shafts, and these shafts are in constant contact with each rotor, for example, with their long axes forming an angle of 90° to each other, as shown in FIG. ing.

3 is a drive shaft, and as shown in FIG. 5, the rotor of the loaf shaft is synchronously rotated in the same direction by a drive gear 5 and driven gears 4a to 4d.

7 is an air intake pipe, and 8 is an air discharge pipe, each of which has a built-in intake valve 9.5) and an air valve 10.

In the case of the 7th valve 5h, the intake valve 9 and the exhaust valve 10 are either regular spring valves, high-speed rotary valves, or means for forcibly opening and closing in synchronization with the same rotor valve. It is recommended to use a valve with

A gear box 12 is fixed to an example of a housing FLla, houses the gear groups 4a to 4d, and supports the drive shaft 3 by bearing.

The shape of the tip of the rotor is mathematically analyzed as follows.

As shown in Figure 7, two circles 0 and σ having their centers on the straight line l are drawn so that they partially overlap, in this case OO is the point P
The two tangent lines passing through the circle pass through the center point OO' of the circle and are spaced apart so that they are perpendicular to each other. The two circular cities that were created in this way,
The gore part is in the shape of a rotor. In such an elliptical (not strictly elliptical) rotor shape, the long axis 2 a
, and the vertical axis (width) 2b, there is a relationship of a/b-1+J-Ry-B+b as described above.

In this rotor shape, the tips are pointed (at right angles), and even if they rotate without contacting each other, there will be some wear during long-term operation, so in reality, there will be a slight R at the tips. (R) is considered to exist.

Next, the compression operation of the rotary air compressor according to the present invention will be described.

When the rotors (not shown in Figure 2) are rotated 45 degrees in the same direction, they will gather at the tip of the rotor or at the center of the intake and exhaust ports, as shown in Figure 3, and the space surrounded by the rotors. is O
The state will be as follows.

Conversely, when each rotor is rotated 145° from the state of 2I21, as shown in Fig. 4, the tips rl+ of the adjacent rotors are connected to each other and the space surrounded by the rotors is created. The maximum value V of such a closed space where the maximum itα is expressed as V=(8a'-π(a+b):L), where the distance between the side plates 1a and lb is:

Therefore, if you open the intake valve (close the exhaust valve) when the closed space is opened by the rotor and open the exhaust valve (close the exhaust valve) when the closed space closes, the nitrogen compression operation can be performed continuously. Be able to do that.

The table below shows a case where the rotation angle of the rotor shown in FIG. 2 is O and the angle θ is changed from O to 360°.

(Table) When four rotors like this are driven in rapid succession in the same direction,
Compressed air can be created by repeating suction and compression twice per rotation.

Next, we will discuss the reason why adjacent rotors can maintain contact at all angles of rotation.

Since the rotors 2a to 2d have the same shape and always contact each other at the same angle, a pair of adjacent rotors,
For example, it is sufficient to show the contact relationship between 2a and 20.

Since the shape of each rotor is symmetrical with respect to the long axis, the rotation direction can be either positive or negative, and it is sufficient to show a contact relationship within a range of 45 degrees.

(1) Two rotors AB71 as shown in FIG.
Assuming that it rotates counterclockwise in the 31st direction every 1k, A'
Only θ (0≦θ×45− times ÷ 3 gives 8″.

(2) Instead of rotating B by θ IJ, figure A'' can be rotated by 4J by 1 θ around the center Q' of rotor B.
As shown in the figure, the relative position with the B rotor B', which has rotated by 8 degrees and θ, remains unchanged.

(3) As shown in FIG. 1O, since the angle of the rotor tip 12ii1 is 90'', the tip of A' comes into contact with B' within the range of θ from 0 to 45.

(4) In other words, the tip P of A' when the rotor A is rotated
It is only necessary to show that the locus of is changed to B' and that A'2B.

As is clear from FIG. 11, A' was originally B'
It is rotated and translated around the axis of POtd.
The c mark becomes a circular arc. Further, its radius is a+b, which is equal to the distance λ11 between the two axes.

〔Effect of the invention〕

According to the present invention described in Example 1 above, the following effects can be obtained.

(1) Since the compression space is composed only of the two side plates and the rotor, it is much more like an hour wheel than the conventional structure which has an outer housing on the outside of the mouth.
Oil-free compressed air can be obtained by making the rotor and the outer shell non-contact.

(3) Since the rotor is composed of a simple curved surface and the inner surface of the side plate that forms the housing is flat, the design is better than that of conventional compressors that require complex curved surfaces.
It is easy to process and assemble and can be manufactured at low cost.

[Embodiment 2] No. 12 shows one of the applied examples of the present invention, and is a cross-sectional view showing the rotor arrangement of a rotary air compressor having six rotors.

This example is Nio L'``i' Ha, rotor 2a, 2b, 2c
, 2d and the closed space formed by the rotors 2c, 2d, 2e, and 2r, the compression operation is performed with the respective phases described, and one rotation of six rotors takes four strokes.

In such an air compressor having 4 or more rotors, the number of rotors is N, the number of strokes is 3, and the number of rotors per 1j stroke, N/S, is 6/4 when N=6. -3/2 pieces.

FIG. 13 shows another example of application of the present invention.
FIG. 1 is a cross-sectional view showing a rotary air compressor device having 16 rotors.

In the case of such 16 rotors, the compression operation is performed between the left and right and upper and lower rotors, and the compression operation is performed in 18 rows per rotation.

The number of rotors per stroke is 16/18-8/9 sheets becomes more efficient.

〔Effect of the invention〕

According to the invention described in Example 2, in addition to the effect described in the effect of the invention in Example 1, an extremely efficient rotary air compressor can be obtained by increasing the number of rotors and arranging them at the same pitch. become.

Although the invention made by the present inventor has been specifically explained above based on actual examples, the present invention is not limited to the above examples, and can be modified in various ways without departing from the gist thereof. Needless to say.

For example, since multiple rotor shafts are completely synchronously rotated in the same direction by the drive shaft, it is desirable to have a rotation transmission system that can cancel out the backlash of the gears, especially during l171 when moving from the compression process to the suction process. It is expected that the forces will reverse and a hack crunch will appear.

[Application field]

The present invention is applicable to air compressors that require low noise and low vibration.
ζ is valid.

The present invention is applicable to small and low-cost air compressors.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a cross-sectional view of a co-rotating air compressor, and FIGS.
FIG. 5 is a cross-sectional view taken along line A-A'' in FIG. 1, and the rotation angle of the rotor is changed. FIG. 5 is a cross-sectional view taken along line B-I3'' in FIG. FIG. 6 is a perspective view showing -gB of the rotor shape. Figure 7 shows the original F for drawing the l4Ji surface shape of the rotor.
J f, "I. No. 81;
FIG. 3 is a principle diagram for explaining the method of maintaining contact between loaves. FIGS. 12 and 13 are IIJr side views of the rotor arrangement showing an application example of the present invention. IJ, 1b1 Noritsueyuki, 2a, 2b: o-yu, 3:
% Moving axis, 4 a, 4 b-・5: Gear, 5 a, 5 b
: O-tashaft, 7: Air intake pipe, 8: Air exhaust pipe, 9: Intake valve, 10: Exhaust valve, 11 Ni spacer, 12: Gear box.

Claims (1)

[Claims] 1. Equipped with parallel side plates and an even number of rotors of 4 to 4 or more having an approximately elliptical cross section sandwiched between the side plates,
These rotors are rotatably arranged so that adjacent rotors are in contact with each other at 90 degrees, and by synchronously rotating each rotor in the same direction, the space surrounded by the side plate and the rotor can be changed. A rotary air compressor 2 characterized in that the approximate cross-sectional shape of each of the rotors is a combination of arcs obtained by dividing one circle into four equal parts, and the ratio of the major axis to the minor axis is 1+√2. The rotary air compressor according to paragraph 1.