JPS59150992A - Scroll hydraulic machine - Google Patents

Abstract

PURPOSE:To smooth the rotary motion of rotary scroll and reduce the vibration of the machine by a method wherein the power of a shaft is transmitted directly to eccentric pins, provided at the other surfaces of auxiliary gears and engaged with engaging holes formed on the end plate of the rotary scroll, upon driving the machine. CONSTITUTION:The power of the shaft 16 is transmitted directly upon driving the machine to the eccentric pins 20a, 20b, provided at the other surfaces of the auxiliary gears 18a, 18b and engaged with the engaging holes 22a, 22b formed on the end plate 2a of the rotary scroll member 2, therefore, the eccentric pins 20a, 20b will never change the postures thereof into a reverse rotational direction which results in rotational vibration. Accordingly, the rotary scroll member 2 may be rotated smoothly and the vibration may be reduced. The eccentric pins 20a, 20b are engaged with the engaging holes 22a, 22b formed on the end plate of the rotary scroll member 2, therefore, the end plate 2a may be miniaturized and, as a result, the whole of the machine may be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to scroll fluid machines such as scroll compressors, scroll expanders, and scroll pumps.

[Prior art]

A conventional scroll fluid machine is shown in FIGS. 1, 2, and 3.

These figures show a scroll fluid machine including a stationary scroll member i, an orbiting scroll m member 2, a seam 5, a crankshaft 6, a balance weight 9, and an Oldham ring 12.
It is equipped with an anti-rotation mechanism that combines an Oldham key 13, a seal nozzle, a bearing, etc.

The stationary scroll member 1 includes an end plate 1a and a wrap 1b provided upright thereon. The orbiting scroll member 2 includes an end plate 2a and a wrap 2b, similar to the stationary scroll portion #1. The wraps lb and 2b of the stationary and orbiting scroll members 1 and 2 are formed by an involute or a curved line approximating it, and have a uniform thickness and a uniform height.

A port 3 is provided at the center of the end plate 1a of the stationary scroll member 1, and another port 4 is provided on the outer circumferential side. The port 3 becomes a discharge port in the case of a compressor and an inflow port in the case of an expander. The port 4 serves as an intake port in the case of a compressor, and serves as a discharge port in the case of an expander.

A scroll bin 2C is provided protruding from the back surface of the orbiting scroll member 2.

Stationary, orbiting scroll member 1.2 has laps lb, 2b
are interlocked with each other inside. In this state,
The winding end ends 1b' and lb' of each wrap 1b and 2b are located at positions shifted from each other by 180 degrees.

The frame 5 includes an end plate 1a of the stationary scroll member 1.
is fixed by a plurality of bolts installed at intervals in the circumferential direction.

The crankshaft 6 is supported by the frame 5 by two bearings 7 and 8 attached to the frame 5, and is connected to a prime mover (not shown).

Although the crankshaft 6 is integrally provided with a balance weight 9, the balance weight 9 may be separate from the crankshaft 6.

Further, a boss hole 10 is formed in the head of the crankshaft. The boss hole 10 is located at a distance of 6 from the axis 0 of the crankshaft 6.
The boss hole 10 has a center eccentrically located by
A scroll bin 2C is fitted. A needle bearing 11 is provided between the boss hole 10 and the scroll bin 2C.

The Oldham ring 12 is provided between the back surface of the end plate 2a of the orbiting scroll member 2 and the frame 5.

Orbiting scroll member 2 in this Oldham ring 12
A straight groove (not shown) is formed on the surface facing the end plate 2a and the frame 5. The grooves provided on the surface facing the frame 5 in these grooves are as follows:
The groove is orthogonal to the groove provided on the surface of the orbiting scroll member 2 facing the end plate 2a. Furthermore, an Oldham key 13 fixed to the frame 5 is fitted into a groove provided on the surface facing the frame 5, and the end plate 2 of the orbiting scroll member 2 is fitted with an Oldham key 13 fixed to the frame 5.
An Oldham key (not shown) fixed to the end plate 2a is fitted into a groove provided on the surface facing a.

The mechanical seal 14 is provided at a portion where the crankshaft 6 penetrates the frame 5 and projects to the outside, and is housed within the seal nozzle 15.

In the conventional scroll fluid machine, when the shift rank shaft 6 is rotated clockwise in FIG. It rotates clockwise without rotating.

As a result, the sealed space V formed between the stationary and rotating scroll members 1 and 2 reduces its volume while rotating clockwise when used as a compressor, and the fluid taken in from the port 4 is reduced in volume. It is compressed and discharged from port 3.

In addition, when the orbiting scroll member 2 is rotated counterclockwise when used as an expander, the closed spaces V, , V,
Gradually increase the volume while turning counterclockwise, and
The high-temperature, high-pressure gas that flows in from the port 4 expands and is discharged from the port 4. At this time, power is generated in the crankshaft 6.

Further, when used as a pump, the number of turns of the spiral is set to 1.5 so that there is no change in the volume of the closed space V,,V,.

By the way, in the conventional scroll fluid machine shown in FIGS. 1 to 3, when the Oldham key 13 slides on the straight groove of the Oldham ring 12, which constitutes the rotation prevention mechanism of the orbiting scroll 2, the surface of the Oldham key 13 slides. If the parallelism was not good, there was a risk of problems such as uneven contact and burning. In addition, in order to improve the parallelism of the 1-inch line groove and the surface angle with the orthogonal groove, there is a drawback that the processing cost becomes extremely high.

In addition, other prior art (e.g. British Published Patent No. 20
No. 25530), in addition to the crankshaft, an auxiliary crank is provided to prevent rotation.

However, in the case of this conventional technology, if there is a gap in the coupling member (bearing) between the auxiliary crank and the orbiting scroll member, the auxiliary crank will rotate in the opposite direction, and the orbiting scroll member will not move smoothly. There was a drawback that the shooting became thicker.

Also, other prior art (e.g. USP, 41921
52, USP, 3802809, JP 57-7620
In 2), a mechanism is used in which gears are used to transmit the rotation of the main shaft to a plurality of shafts provided on the outer periphery of the orbiting scroll member, and a crank is used to cause the orbiting scroll member to orbit. However, since this mechanism has a rotating shaft on the outer periphery, the overall outer diameter becomes large and the structure becomes complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll fluid machine that can smoothly orbit an orbiting scroll member, has a simple and compact structure, has low vibration, and is highly reliable.

[Summary of the invention]

The present invention provides a mechanism for converting the rotational motion of the shaft into the orbiting motion of the fully orbiting scroll member, which includes a main gear provided on the shaft, at least two auxiliary gears meshed with the main gear, and one of the auxiliary gears. A rotary shaft provided at the center of the auxiliary gear on the end face and rotatably supported on the fixed member side, and a rotary shaft provided on either the other end face of each auxiliary gear or the end plate of the orbiting scroll member with respect to the rotary shaft. It is characterized in that it is constructed of an eccentric pin that protrudes at an eccentric position and is fitted into a fitting hole formed in either the end plate of the orbiting scroll member and the other surface of the auxiliary gear. ,
With this configuration, all of the above objectives can be achieved.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on the drawings.

4 and 5 show an embodiment of the present invention, in which the mechanism for converting the rotational motion of the shaft into the orbiting motion of the orbiting scroll member is provided at the end of the end plate 2a of the orbiting scroll member 2 in the shaft 16. A main gear 17 provided at the main gear 17, two auxiliary gears 18a, 18b arranged around the main gear 17 at equal intervals and meshed with the main gear 17, and each auxiliary gear 18a.

The end plate 2 of the orbiting scroll member 2, which is one surface of the
Auxiliary tooth 1sti s a on the opposite surface of a.

Rotating shafts 19a, 19b provided at the center of 18b.

At the surface of the end plate 2a side of the orbiting scroll member 2, which is the other surface of each auxiliary gear 18a, 18b, the rotating shaft 19a
, 19b and an eccentric bin 20a provided at an eccentric position,
20b. In addition, Figures 4 and 5
In the figure, the center of the shaft 16 is marked 011, and the centers of the auxiliary gears 18a and 18b are marked 018@, Q1@b.
% eccentric pin 2Qa.

The center of 20b is marked O, 0a, O,. b, and the eccentricity F# between the rotating shafts 19a, 19b and the eccentric bins 20a, 20b! The turning radius is indicated by 6.

Rotating shafts 19a and 19b provided on one surface of the auxiliary gears 18a and 18b are inserted into holes 21a and 21b formed in the frame 5 as a fixed member. A bearing 2 is provided between the rotating shafts 19a, 19b and the holes 21a, 21b.
3a, 23b are provided, and these bearings 23a, 23
Rotating shafts 19a and 19bH are rotatably supported via b.

Eccentric pins 20a, 20b provided on the other side of the auxiliary gears 18a, 18b are the auxiliary gears 18a.

They are arranged eccentrically in the same direction with respect to 18b. Further, the eccentric bins 20a, 20b are fitted into fitting holes 22a, 22b formed in the end plate 2b of the orbiting scroll member 2, and the eccentric bins 20a*20b and the fitting holes 22a,
A bearing 24a is provided between 22b and 22b.

24b is attached.

Moreover, the holes 21a and 2 in the rotating shafts 19a and 19b
Parancers 25a and 25b are attached to the ends protruding from 1b.
is attached, and the centrifugal force acting on the orbiting scroll member 2 is balanced by the balancer.

Furthermore, in this embodiment, a thrust bearing 26 is provided between the main gear 17 and the end plate 2a of the orbiting scroll member 2, so that the thrust bearing 26 receives an axial gas force acting on the orbiting scroll member 2. This thrust bearing 26 may be provided at any position on the back surface of the end plate 2a of the orbiting scroll member 2, or may be provided between the orbiting scroll member 2 and the frame 5. In the case of a structure in which a gas force is applied to the back surface of the orbiting scroll member 2 to press the orbiting scroll member 2 against the stationary scroll member 1, the orbiting scroll member 2 is stationary.

A thrust bearing may be provided between the end plates 1a and 2a of the orbiting scroll members 1 and 2.

The scroll fluid machine equipped with the mechanism for converting the rotational motion of the shaft into the orbital motion of the orbiting scroll member operates as follows.

That is, when the shaft 16 is rotated in the direction of arrow A in FIG. 5 as the prime mover (not shown) is driven, the main gear 17 is rotated in the same direction, and the auxiliary gears 18a, 18b are rotated in the same direction.
rotate in the direction of the arrow in FIG.

Then, when the auxiliary teeth jlj18a, 18b rotate, the eccentric gears y2Qa, 20b become the auxiliary gear 18a.

It rotates at the center of 18b at a rotation angle of 0+sa e ollb with eccentricity distance ε as the radius of rotation.

As a result, the orbiting scroll member 2 is prevented from rotating with respect to the stationary scroll member 1 and is allowed to rotate with a radius of rotation ε, and both the stationary and orbiting scroll members 1 and 2
The closed space V, , V, formed between the wraps lb and 2b of
moves. During such driving, the power of the shaft 16 is transmitted to the eccentric bin 20a.

20b, the eccentric bins 20a and 20b do not change their posture in the opposite rotation direction or cause rotational vibration, and therefore the orbiting scroll member 2 can be smoothly orbited, reducing vibration. be able to.

In this embodiment, the eccentric gears y2Qa and 20b provided on the auxiliary gears 18a and 18b are connected to the orbiting scroll member 2
Since it is fitted into the fitting holes 22a and 22b formed in the end plate 2a of the swing member 2, the outer diameter of the end plate 2a of the swingable member 2 can be reduced, and as a result, the entire machine can be made compact. can.

In addition, in the embodiment shown in FIGS. 4 and 5,
The other features of the structure 9 are similar to those of the scroll fluid machine shown in FIGS. 1 to 3, and the same members are designated by the same reference numerals and further explanation will be omitted.

Next, FIG. 6 shows another embodiment of the present invention, in which an auxiliary gear 1 on the back surface of the end plate 2a of the orbiting scroll member 2
Eccentric beams 27a, 27b are located at positions corresponding to 8a, 18b.
, and auxiliary teeth +[18a.

18b has its center 0.8. ．． Distance ε with respect to 0□b,
Fitting holes 28a, 28b are formed at eccentric positions, and the eccentric piers 27a, 27b are inserted into the fitting holes 28a.

28b, and the eccentric pins 27a, 27b and the fitting hole 28.
Bearings 29a and 29b are mounted between a and 28b. In addition, in FIG. 6, 027m and 021b indicate the center of the eccentric bin.

As a result, in the embodiment shown in FIG.
, 18b can be easily processed.

Next, FIG. 7 shows another embodiment of the present invention. In this embodiment, auxiliary gears 18C, 18d, 18e and rotating shafts t9c, 19d are arranged at equal intervals around the main gear 17.
, 19e, and eccentric beams y20cs20d, 20e. In FIG. 7, Ol, . . . ~0□ are the center of the rotation axis, 02o, .about.0. . indicates the center of the eccentric bin.

Therefore, in the embodiment shown in FIG. 7, the force acting on the eccentric bins is equal to
Even if there is a gap between the eccentric bottle and its bearing, there will be no abnormal force applied to only one eccentric bottle, further improving reliability. be able to.

In each of the embodiments shown in FIGS. 6 and 7, the other functions of the structure 1 are the same as in the embodiments shown in FIGS. 4 and 5.

〔Effect of the invention〕

According to the present invention described above, the mechanism for converting the rotational motion of the shaft into the orbiting motion of the orbiting scroll member is comprised of a main gear provided on the shaft and at least two auxiliary gears meshed with the main gear. , a rotating shaft provided at the center of the auxiliary gear on one end surface of each auxiliary gear and supported by a fixed member such as a frame, and the other surface of each auxiliary gear and the end plate of the orbiting scroll member. and an eccentric pin protruding from a position eccentric to the rotating shaft and fitted into a fitting hole formed in either the end plate of the orbiting scroll member or the other surface of the auxiliary gear. As a result, the rotation of the shaft can be directly transmitted to the eccentric bin to cause the orbiting scroll member to orbit, resulting in the effect that the orbiting scroll member can be smoothly orbited.

Further, according to the present invention, the structure is simple, and since there is nothing protruding from the outer periphery of the end plate of the orbiting scroll member, there is an effect that the structure can be made compact, and as mentioned above, the orbiting movement of the orbiting scroll member can be smoothly performed. Therefore, it has the effect of reducing vibration, and also has the effect of improving reliability because it does not cause problems such as burn-in.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view of a conventional scroll fluid machine;
The figure is a longitudinal sectional front view taken along the line II-II in Figure 1, Figure 3 is a plan view of the rotation prevention mechanism of the orbiting scroll member in the conventional scroll fluid machine, and Figure 4 is the one according to the present invention. 5 is a plan view of the same stationary state with the orbiting scroll member removed; FIG. 6 is a longitudinal sectional front view of another embodiment of the present invention; and FIG. 7 is a plan view of another embodiment of the present invention. FIG. 2 is a plan view showing an embodiment with the stationary and orbiting scroll members removed. 1.2... Stationary, orbiting scroll member, la, 2a.
・End plates of stationary and orbiting scroll members, 1b, 2b...
・Same wrap, 5...Frame, 17...Shaft,
18a-18e... Auxiliary gear, 19a-19e...
Rotating shaft, 20a to 20e... Eccentric bottle, 21a, 2
1b... Hole for the rotating shaft, 22a, 22b... Fitting holes for eccentric bins formed in the end plate of the orbiting scroll member,
23a, 23b...bearing for rotating shaft, 24a, 24b
... Bearing for eccentric bin, 0.6 ... Center of shaft, 01, 0111b ... Center of auxiliary gear, 0. . ,. 0,. b...Center of eccentric bin, ε...Eccentricity - orbiting radius of orbiting scroll member, 25a, 25b.
... Balancer, 26 ... Thrust bearing, 27a, 27
b... Eccentric bottle, 28a, 28b... Fitting hole for the eccentric bottle formed in the auxiliary gear, 29a, 29b... Bearing for the eccentric bottle. 1st drawing 2nd drawing / 3rd b 14th eye leather 5 mouth 2θf JP-A-59-150992 (7) y 7 ward (h'lc ~N-----": \7/-\ /to\,

Claims (1)

[Claims] 1. The wrap of the stationary scroll member and the wrap of the orbiting scroll member are engaged with each other in a state facing inward, and the orbiting scroll member is rotated so as not to apparently rotate relative to the stationary scroll member. In a scroll fluid machine used for a pump, etc., which moves, compresses, expands, or transfers the fluid sucked into the sealed space formed between both wraps, the sea? A mechanism for converting the rotational motion of the rotating scroll member into the orbiting motion of the orbiting scroll member includes a main gear provided on the shaft, at least two auxiliary gears meshed with the main gear, and an auxiliary gear on one end surface of each auxiliary gear. A rotating shaft provided at the center of the rotating shaft and rotatably supported on the fixed member side, and a rotating shaft located eccentrically with respect to the rotating shaft on either the other end face of each auxiliary gear or the end plate of the orbiting scroll member. 1. A scroll fluid machine comprising an eccentric pin that projects and is fitted into a fitting hole formed in either the end plate of the orbiting scroll member or the other surface of the auxiliary gear. 2. The eccentric bin is provided on the end plate of the orbiting scroll member,
The scroll fluid machine according to claim 1, wherein the end of the eccentric bottle is fitted into an auxiliary gear. 3. The scroll fluid machine according to claim 1, wherein three sets of the auxiliary gear, the rotating bin, and the eccentric bin are arranged at equal intervals around the main gear.