JPH09324770A - Twin type scroll fluid machine - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] In a twin scroll fluid machine, since the orbiting scroll is constructed without being fixed on the eccentric drive shaft in the conventional configuration, the left and right orbiting gaps of the orbiting scroll are However, the contact pressure was not constant, abnormal surface pressure of the tip seal occurred, and leakage occurred on the opposite end surface, so the aim was to position the orbiting scroll at the center of the left and right fixed scrolls. SOLUTION: Protrusions are formed on the outer peripheral end portion 5 of the orbiting scroll tooth and both ends of the orbiting scroll boss, and a minute gap 9 capable of orbiting motion is provided between the fixed scrolls 3 and 4 and the inner surfaces of the side plates. The fixed scrolls 3 and 4 are connected to each other, and the orbiting scroll 2 is positioned around the center. [Effect] The surface pressures of the left and right tip seals are equalized, abnormal wear and leakage of the tip seals are eliminated, and power increase and short life can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the revolution of an orbiting scroll in a twin scroll fluid machine.

[0002]

2. Description of the Related Art The orbiting structure of an orbiting scroll, a left and right fixed scroll, and an orbiting scroll of a twin-type scroll fluid machine having an eccentric drive shaft as a center, is related to the orbiting scroll. Although it is provided in a twin shape, the orbiting scroll is not configured to have a uniform gap with respect to the fixed scroll, and therefore the orbiting scroll is unevenly distributed due to the processing accuracy and assembly technology of each component. Can occur.

[0003]

In the conventional two-orbiting scroll orbiting structure of the twin type scroll fluid machine, as described above, the one eccentric drive shaft and the left and right three or four drive shafts are fitted so as to fit in the center. While combining the fixed scroll of
The two orbiting scrolls are fitted to the eccentric drive shaft in the internal space, and the scroll teeth are configured to wrap each other,
Furthermore, 7 tip seals of self-lubricating material and 8 cushions of elastic material are fitted to the respective wrap teeth at the tips of the wrap teeth so as to slide on the left and right sides of 3, 4 and the inner surface of the fixed scroll. The structure is such that they are swung together while maintaining airtightness.

However, in this structure, since the two orbiting scrolls are not fixed on one eccentric drive shaft,
On the eccentric drive shaft, left and right 3, 4 fixed scroll teeth and 2
It will be set at a free position within the range of the two axial gaps with the orbiting scroll teeth. That is, in order for the 7-tip seal to operate normally, the gap between the two orbiting scroll teeth and the inner surfaces of the left and right 3, 4 fixed scroll side plates and the gap between the end plate of the two orbiting scroll and the left and right 3, 4 fixed scroll teeth are uniform. The condition is that However, as described above, since the two orbiting scrolls can be freely positioned on the one eccentric drive shaft, the orbiting scroll is hardly located at the center of the axial space provided by the combination of the three and four fixed scrolls. It will be possible. Therefore, assuming that the setting of the two orbiting scrolls on the one eccentric drive shaft is assembled closer to the right side, the clearance between the inner surface of the side plate of the three right fixed scrolls and the tips of the right side scroll teeth of the two orbiting scrolls. Is smaller than the specified value, and the 7-chip seal receives an abnormal surface pressure that cannot be absorbed by the 8-buffer body, which causes early wear of the chip seal and also causes an increase in power due to the abnormal surface pressure.

Next, on the opposite side, the gap between the inner surface of the side plate of the 4 left fixed scroll and the tip of the left scroll tooth of the 2 orbiting scroll is the specified value + (specified value-actual right clearance), which is extremely large. It becomes a gap, and 7 chip seals and 8
Even with the shock absorber, it is present as a weak surface pressure, does not serve as a tip seal, causes leakage throughout the scroll vortex, and causes a situation in which the designed compression ratio cannot be maintained. Further, since two orbiting scrolls are set on one eccentric drive shaft through a plurality of bearings and oil seals are fitted at both ends, the shaft and the orbiting scroll are assembled with an extremely large fitting force. Since the 7-tip seal has a surface pressure that is weaker than the fitting force of these orbiting scrolls, and the surface pressure of the 7-tip seal is weakened by the 8 cushions, the two-orbiting scroll that is set off center has 7 tips. Due to the seal, the phenomenon of moving on one eccentric drive shaft cannot occur.

[0006]

[Means for Solving the Problems] 2 Tooth height dimensions of a portion of each scroll outer edge of 5 scroll teeth where 7 chip seals do not exist, which are formed on both sides of an orbiting scroll end plate, and left and right 3,
By setting a small gap that allows swivel motion with the fixed size of 4 fixed scrolls, 2 orbiting scrolls are swept and combined with 3, 4 fixed scrolls, and the scroll teeth of the tip seal mounting part are The first invention is a configuration in which a gap capable of ensuring a prescribed surface pressure is mutually established by a 7-tip seal, and then the tooth lengths of all scroll teeth formed on both sides of a 2-orbiting scroll end plate have the above-mentioned 7-tip seal. In addition to the size of the scroll teeth of the mounting portion, the 5a orbiting scroll is provided on the inner surface of the side plate of the fixed scroll of 3 or 4 scrolls in the orbiting outer peripheral end where the tip seal does not exist. A second invention is a configuration in which a minute gap is set between the teeth and the outer peripheral end of the vortex, and the tooth is swung and connected by a fixed scroll of 3 or 4 through a protrusion for turning 5a. Further, in a state where the 5 orbiting scroll teeth and the 3 and 4 fixed scroll teeth overlap each other, the gap between the tip of each scroll tooth and each inner surface of the end plate and the side plate makes sliding and orbiting motions through a 7-tip seal. 10 orbiting projections are provided at both ends of the 2 orbiting scroll boss into which the 1 eccentric drive shaft is fitted, and 11 minute gaps are provided between the protrusions and the inner surfaces of the 3 and 4 fixed scroll side plates to hinder the orbiting motion. A third invention is a structure in which the product is held and joined in a state where it is not present.

[0007]

As described in the first to third aspects of the invention, the axial clearance in the orbiting motion space of the orbiting scroll, which is generated by the connection of the two fixed scrolls, is fixed to the orbiting scroll teeth, the vortex outer peripheral end, and both. A minimum gap that allows swivel operation is provided between the inner surface of the scroll side plate or the orbiting projections at both ends of the orbiting scroll boss and the inner surface of both fixed scroll side plates, and the compression effect is fully exerted both horizontally and vertically. It guarantees the swivel motion that keeps the surface pressure of the tip seal evenly maintained.

[0008]

EXAMPLE An example will be described with reference to the necessary drawings of FIGS. FIG. 1 is a conventional overall configuration diagram of a twin scroll fluid machine, and it is extremely difficult to configure the coupling gaps of the two orbiting scrolls 3 and 4 fixed scrolls so that the left and right gaps are uniform. FIG. 2 shows an embodiment of the first invention according to the present invention, in which 1 is an eccentric drive shaft, which is fitted in a two-orbiting scroll. Reference numerals 3 and 4 denote left and right fixed scrolls, which are connected with 5 orbiting scroll teeth, the outer peripheral end of the vortex and the inner surfaces of the fixed scroll side plates 3 and 4 with 6 minute gaps allowing the 2 orbiting scrolls to orbit. Reference numeral 7 is a tip seal, and 8 is a cushioning member made of an elastic material to be put on the back surface of the tip seal. Reference numeral 9 denotes a gap between the end plate of each scroll tooth and the end plate and the side plate facing each other, and a 7-tip seal prevents leakage. FIG. 5 shows an embodiment of the second invention, and 1 is an eccentric drive shaft, which is fitted in a two-orbiting scroll. 2 orbiting scrolls, 3 and 4 left and right fixed scroll scroll teeth,
As for the tooth length, all 9 scroll teeth should be joined with a gap between the end plate and the side plate facing the tip of the scroll teeth. At this time, 5 orbiting scroll teeth are formed on the inner surfaces of the left and right fixed scroll side plates 3 and 4, and 5a orbiting projections are provided at the portions where the outer ends of the vortexes make an orbital movement, and the outermost end of the orbiting scroll teeth is provided with a minimum minute gap in which it can orbit. . 6 indicates a minute gap. Reference numeral 9 denotes a gap between the end plate of each scroll tooth and the side plate facing each other, 7 tip seals, 8
Leakage is prevented with an elastic cushioning material. FIG. 7 shows an embodiment of the third invention, in which 10 orbiting projections are provided at both ends of the boss of a 2 orbiting scroll into which 1 eccentric drive shaft is fitted. Between the protrusion and the inner surface of the 3rd right fixed scroll side plate, 3 or 4 fixed scrolls are connected with 11 minute gaps which allow the 2 orbiting scrolls to orbit. (4, left fixed scroll is not shown.)

Next, the operation will be described. The rotation of one eccentric drive shaft causes the two orbiting scrolls to orbit. At this time, the inner surfaces of both the fixed scroll side plates 3 and 4 and 5
The orbiting motion is performed with a minute gap of 6 or 11 between the orbiting scroll teeth, the outer peripheral end of the vortex, or the ten orbiting protrusions at both ends of the two orbiting scroll bosses. Therefore, in this structure, two orbiting scrolls are positioned on one eccentric drive shaft by means of three and four fixed scroll couplings, and are fitted with 7 tip seals and 8 elastic material buffers, facing 9 scroll tooth tips. The gap between the mirror plate and the side plate can be made uniform.

[0010]

In the twin type scroll fluid machine according to the present invention, the axial dimension in the orbiting motion space of the two orbiting scrolls is 6 or 11 with a minute gap in the orbiting motion space of the two orbiting scrolls. The end plate facing the tip of the scroll tooth of 9 that operates the 7-tip seal by ensuring the substantial orbital movement and vertical and horizontal levels, and positioning the 2 orbiting scroll without using a fixed bearing or the like. The gap with the side plate can be made uniform or constant. Therefore, the short life due to abnormal wear due to increased surface pressure of the 7-tip seal, the reduction of the compression ratio due to the leakage between the compression chambers, the lack of the maximum ultimate pressure and the degree of vacuum caused by the insufficient surface pressure of the 7-tip seal It is an invention that has a great effect with useful features that never occur.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a twin scroll fluid machine having a conventional orbiting scroll mechanism.

FIG. 2 is a vertical cross-sectional view of the scroll portion of the twin scroll fluid machine having the orbiting scroll axial positioning structure according to the first aspect of the present invention.

FIG. 3 is a right side plan view of the orbiting scroll according to the first aspect of the present invention.

FIG. 4 is a left side plan view of an orbiting scroll according to the first aspect of the present invention.

FIG. 5 is a vertical cross-sectional view of a scroll portion of a twin scroll fluid machine having an orbiting scroll axial positioning structure according to a second aspect of the present invention.

FIG. 6 is a plan view of a right fixed scroll according to a second invention of the present invention.

FIG. 7 is a longitudinal cross-sectional view of a shaft portion of a twin scroll fluid machine having an orbiting scroll boss portion with an axial positioning structure according to a third invention of the present invention.

FIG. 8 is a right side plan view of an orbiting scroll according to a third invention of the present invention.

[Explanation of symbols]

1 ... Eccentric drive shaft 2 ... Orbiting scroll 3 ... Right fixed scroll 4 ... Left fixed scroll 5 ... Orbiting scroll teeth, vortex outer edge 5a ... Orbiting projections 6, 11 ... Minute gap 7 ... Tip seal 8 …… Elastic material buffer 9 …… Gap between the end plate and the side plate facing the tip of the scroll tooth 10 …… Orbiting projections at both ends of the orbiting scroll boss 12…
… Casing S …… Eccentricity

Claims (3)

[Claims] 1. A fixed scroll and a casing, an orbiting scroll, and an eccentric drive shaft. The orbiting scroll is configured to revolve without rotating, and fixed, and scroll teeth are axially provided on both end plates of both orbiting scrolls. In a twin-type scroll fluid machine that configures a wrap portion and compresses the compression chamber from the outer periphery toward the center, the vortex outer peripheral end portions of the scroll teeth that are formed on both surfaces of the orbiting scroll end plate are the inner surfaces of the side plates of the left and right fixed scrolls. Is sandwiched between
A small gap is provided between the vortex outer peripheral ends of the scroll teeth on both sides of the orbiting scroll end plate and the inner surfaces of the left and right fixed scroll side plates, such that the orbiting scroll does not substantially tilt. A twin scroll fluid machine characterized by being connected to a fixed scroll. 2. An orbital outer peripheral end of an orbiting scroll tooth is provided with orbiting projections on corresponding surfaces of left and right fixed scroll side plates which make an orbiting motion with a minute gap. The twin type scroll fluid machine according to the first aspect. 3. A fixed scroll, a casing, an orbiting scroll, and an eccentric drive shaft. The orbiting scroll is configured to revolve without rotating, so that both side plates and end plates of both fixed and orbiting scrolls scroll in the axial direction. With teeth,
In a twin scroll fluid machine that configures a wrap portion and compresses a compression chamber from the outer periphery toward the center, swivel projections are provided at both ends of a shaft boss portion of an orbiting scroll, and the swivel projections at both ends are The orbiting scroll is sandwiched between the inner surfaces of the side plates of the fixed scroll, and the orbiting scroll is substantially movable between the orbiting protrusions at both ends of the orbiting scroll shaft boss and the inner surfaces of the left and right fixed scroll side plates. A twin scroll fluid machine characterized in that it is connected to a fixed scroll with a minute gap that does not tilt.