JPH0610081Y2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine in which a movable scroll is revolved around a fixed scroll.

(Prior Art) Conventionally, as a scroll-type fluid machine of this type, a fixed scroll and a movable scroll are supported by a frame that is housed in a closed casing, and a thrust plate is interposed between the end plate of the movable scroll and the frame. In addition, while a transmission mechanism is provided between the movable scroll and the drive shaft of the motor, an Oldham ring is interposed between the transmission mechanism and the movable scroll, and the movable scroll is fixed via the Oldham ring. The structure in which the scroll is revolved is already known, for example, in Japanese Patent Application Laid-Open No. 59-183091.

The Oldham ring used in the scroll type fluid machine, as shown in FIG. 4, has a first key that slides relative to the frame in two directions that are orthogonal to each other in the radial direction of the ring body (R). Means (X, X),
Second key means (Y, Y) that slides with respect to the movable scroll is provided.

The first key means (X, X) includes a pair of rectangular keys (a, a) projecting from the frame side and the ring body (R) for slidably engaging the keys (a, a). ) Is formed in a radial direction of a pair of guide grooves (b, b), and the second key means (Y, Y) is arranged on the movable scroll side in a direction orthogonal to the keys (a, a). A pair of projecting rectangular keys (c, c) and a pair of guide grooves (d, d) formed in the radial direction of the ring body (R) for slidably engaging the keys (c, c). And the guide grooves (b, b) of the keys (a, a) (c, c).
By engaging with (d, d), the movement of the movable scroll with respect to the fixed scroll is restricted only in the orthogonal direction, and the fixed scroll is revolved while preventing the movable scroll from rotating.

(Problems to be solved by the invention) By the way, in each of the key means (X, X) (Y, Y) adopted in the Oldham ring as described above, the key (a, a) (c, c) is Each of the guide grooves (b, b)
Since the contact is made only in the short dimension of the length dimension of (d, d), that is, the width dimension of the ring body (R), the surface pressure acting on the sliding surface becomes large and the sliding characteristic is improved. There was a problem, and there was also a problem with the strength of the ring body (R).

In order to solve the above problems, by forming the respective keys integrally on the ring main body side and sliding the respective keys with respect to the guide grooves formed in the frame and the movable scroll, It has been considered that the length of each key can be increased and the surface pressure applied to the sliding surface can be reduced.

That is, as disclosed in JP-A-62-124324, in forming the Oldham ring,
The ring body is provided with a pair of first keys extending outward in the radial direction and a second key projecting from the ring body in a plane orthogonal to the first keys. Thus, the first key is slidably engaged with the guide groove on the movable scroll side, and the second key is slidably engaged with the guide groove on the frame side.

By the way, since it is necessary to interpose a thrust plate for thrust-supporting the movable scroll with respect to the frame between the frame and the movable scroll, the Oldham ring configured as described above is used as the frame. When interposing between the movable scroll and the movable scroll, it is necessary to previously set the thrust plate in the Oldham ring, that is, the back side of the first key and the front side of the second key in the ring body. It is necessary to interpose the thrust plate between and.

When the thrust plate is assembled to the Oldham ring as described above, if the thrust plate is made of synthetic resin, the elastic plate has an elastic deformation to perform the assembling work of the thrust plate to the Oldham ring. Although it can be performed relatively easily, on the other hand, when the thrust plate is made of synthetic resin, temperature characteristics and wear characteristics are poor, and machining accuracy is difficult to obtain. It is necessary to do so, and the cost becomes high.

Therefore, in order to solve the problems caused by forming the thrust plate with a synthetic resin, it was considered to form the thrust plate with a metal. Since elastic deformation cannot be expected, the workability of assembling the thrust plate into the Oldham ring deteriorates.

In order to improve the workability of assembling the thrust plate into the Oldham ring, it may be considered that the thrust plate is formed larger than the Oldham ring. There is a risk that the edge portion may come into contact with the sliding characteristics, and the keys of the Oldham ring may be formed smaller than the thrust plate. In such a case, however, the surface pressure applied to the keys may be reduced. However, none of them could be adopted.

The present invention was devised under the above consideration, and its purpose is to form each key integrally with the ring body of the Oldham ring by adding a simple device to the thrust plate. It is an object of the present invention to provide a scroll type fluid machine capable of improving the workability of incorporating the thrust plate into the Oldham ring.

(Means for Solving the Problems) As shown in the embodiments of the drawings, the present invention provides a scroll type fluid machine which orbitally drives a movable scroll (3) with respect to a fixed scroll (2). Between the end plate (3a) and the frame (4) supporting the end plate (3a), an annular thrust plate (7) for thrust-supporting the end plate (3a) is interposed, and the movable scroll is provided. A ring body (80) having an elongated hole-like fitting hole (80a) into which the boss portion (3b) of (3) is fitted;
Radially outward from the major axis side of the ring body (80) to the surface side of the thrust plate (7) in a rising manner and freely slidable in the guide grooves (31, 31) of the movable scroll (3). The pair of first keys (81, 81) engaged with each other and the frame (4) extending radially outward from the minor axis side of the ring body (80) to the rear surface side of the thrust plate (7). ), The Oldham ring (8) having a pair of second keys (82, 82) slidably engaged with the guide grooves (41, 41) of FIG. A notch (7) is formed in the peripheral edge portion for passing the second key (82, 82) to the back surface side of the thrust plate (7).
2) is provided.

(Operation) When the thrust plate (7) is assembled in the Oldham ring (8), the Oldham ring (8)
The first key (8) provided integrally with the ring body (80) of
1, 81) respectively located on the surface side of the thrust plate (7), the second key (82, 8)
The key (82) on one side of 2) is inserted from the front surface side to the back surface side of the annular hole formed in the central portion of the thrust plate (7), and in this state, the ring body (8) is inserted.
0) is moved with respect to the annular hole so that the key (82) on the other side is opposed to the cutout portion (72) formed in the thrust plate (7) (see FIG. 2), and then the cutout portion is formed. The other side key (82) is passed to the rear surface side of the thrust plate (7) via the (72), whereby the thrust plate (7) can be operated by the first key (81, 81). ) And the front side of the second key (82, 82) (see FIG. 1).

(Embodiment) A scroll type fluid machine according to the present invention will be described below with reference to an embodiment of the drawings.

The scroll type fluid machine shown in FIG. 3 has a frame (4) in which a fixed scroll (2) and a movable scroll (3) are fixed to the casing (1) at the upper inside of the closed casing (1). And the drive shaft (5) extending in the vertical direction is supported by the frame (4), and the lower end side of the drive shaft (5) is installed in the casing (1). The drive shaft (5) is connected to a motor (M), and the upper end side of the drive shaft (5) is connected to the movable scroll (3) via a transmission means (6).

The transmission means (6) has a counter weight (61) integrally provided on the upper side of the drive shaft (5), and a drive pin (62) and a limit pin (62) protruding from the counter weight (61). 63) and these pins (62) (6)
3) and a swing link (64) connected to the counter weight (61).

However, in the scroll type fluid machine as above,
End plate (3a) of the frame (4) and the movable scroll (3)
A thrust plate (7) for thrust-supporting the end plate (3a) is provided between the movable scroll (3) and the fixed scroll (3) between the frame (4) and the movable scroll (3). The Oldham ring (8), which is driven to revolve with respect to 2), is interposed.

As shown in detail in FIG. 1, the Oldham ring (8) has a long hole shape into which a boss (3b) projecting downward is fitted to an end plate (3a) of the movable scroll (3). A ring body (80) having a fitting hole (80a), and a ring-shaped body (80) projecting from the major axis side of the ring body (80) radially outward toward the surface side of the thrust plate (7) in a rising shape. The pair of first keys (81, 81) formed and the first key (8) from the minor axis side of the ring body (80).
1, 81) and a pair of second keys (82, 82) formed integrally with the ring body (80) so as to project toward the back surface of the thrust plate (7) in the same plane. The first key (81, 81) is formed on the lower surface side of the movable scroll (3) with a pair of guide grooves (3
1, 31) slidably engaged with each other, and the second key (82, 82) slidably engaged with a pair of guide grooves (41, 41) formed on the upper surface of the frame (4). Is engaged with.

Thus, the first and second keys (81, 81) (82,
82) each of the guide grooves (31, 31) (41, 41)
With respect to the fixed scroll (2) while restricting the movement of the movable scroll (3) with respect to the fixed scroll (2) only in the orthogonal direction to prevent rotation of the movable scroll (3). It is designed to be driven by the orbit.

In addition, the thrust plate (7) has an annular hole (71) in the central portion thereof so as to have an annular shape as a whole, and the inner peripheral edge portion of the annular hole (71) in the thrust plate (7). A notch (72) for passing one side of the second key (82, 82) integrally formed with the Oldham ring (8) to the back side of the thrust plate (7). .

Thus, when the thrust plate (7) is incorporated and set in the Oldham ring (8), the first key (81, 81) provided in the Oldham ring (8) is set as shown in FIG. 81) are located on the surface side of the thrust plate (7), one key (82) of the second keys (82, 82) can be opened on the thrust plate (7). The ring body (80) is inserted into the annular hole (71) from the front surface side to the back surface side, and the ring body (80) is attached to the annular hole (71) in this state. The first key (8
1, 81) are inserted inward as the root portions (81a, 81a) of the second key (82, 82) contact the inner peripheral edge of the annular hole (71). The other side key (82) is opposed to the cutout portion (72) provided in the annular hole (71) of the thrust plate (7), and then the other side key (82) is removed from the cutout portion (72). The thrust plate (7) is passed to the back side.

By the above assembling work, the thrust plate (7) can be easily assembled on the back surface side of the first key (81, 81) and on the front surface side of the second key (82, 82). .

Further, in the embodiment of FIGS. 1 and 2, when the thrust plate (7) is installed in the Oldham ring (8), the annular hole (7) of the thrust plate (7) is set.
When the ring body (80) is inserted into the inner side of the ring body (1) with respect to 1), the first key (8) in the ring body (80) is inserted.
1, 81) are formed with auxiliary notches (73, 73) in a part of the inner circumference of the annular hole (71) with which the respective root parts (81a, 81a) are abutted, and these auxiliary notches (73, 73) are formed. 7
3, 73) in the range of each root portion (81a, 81a)
By further inserting the second key (82, 82) into the cutout portion (72), that is, the Oldham ring (8) of the thrust plate (7). ), The auxiliary notches (73, 73) are provided so that the notch depth of the notch (72) is as shallow as possible, and the strength of the thrust plate (7) is increased. I try to guarantee it.

Since the thrust plate (7) as described above can be easily assembled into the Oldham ring (8) regardless of the material, the thrust plate (7) is made of a metal material, and the thrust plate (7) is made of metal. It is possible to improve the temperature characteristics and wear characteristics of (1), and moreover, it is easy to obtain the processing accuracy and the cost can be reduced. Of course, the thrust plate (7) can be formed of not only a metal material but also a synthetic resin.

(Effect of the Invention) As described above, in the scroll type fluid machine of the present invention, the end plate (3a) of the movable scroll (3) and the end plate (3).
Between the frame (4) supporting a), the end plate (3a)
An annular thrust plate (7) for thrust-supporting is interposed, and a ring body (80a) having a long hole for fitting the boss portion (3b) of the movable scroll (3) is provided. 80) and a guide groove provided in the movable scroll (3) integrally extending in a rising manner radially outward from the major axis side of the ring body (80) toward the surface side of the thrust plate (7). A pair of first keys (81, 81) slidably engaged with (31, 31) and a rear surface side of the thrust plate (7) radially outward from the minor axis side of the ring body (80). An Oldham ring (2) having a pair of second keys (82, 82) slidably and integrally extending in a plane toward the guide groove (41, 41) provided in the frame (4). 8) while the inner circumference of the thrust plate (7) In part, the second key (82,8
Since the notch (72) is formed to allow the second plate (2) to pass on the back surface side of the thrust plate (7), the first key (81,
81) is a flat second key (82, 82) for sliding the thrust plate (7) on the surface side and the frame (4) side.
When installing each of them on the back side of the thrust plate (7), without making the thrust plate large or shortening each key, and regardless of the material of the Oldham ring (8), it is easy. The incorporation can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a scroll type fluid machine according to the present invention, FIG. 2 is a plan view showing an assembling work state of a thrust plate to an Oldham ring, and FIG. 3 is a part of the scroll type fluid machine. FIG. 4 is a perspective view showing an example of a conventional Oldham ring. (2) …… Fixed scroll (3) …… Movable scroll (3a) …… End plate (3b) …… Boss part (31) …… Guide groove (4) …… Frame (41) …… Guide groove (7) ...... Thrust plate (72) …… Notch (8) …… Oldham ring (80) …… Ring body (80a) …… Mating hole (81) …… First key (82) …… Second key

Claims (1)

[Scope of utility model registration request] 1. A scroll type fluid machine for orbitally driving a movable scroll (3) with respect to a fixed scroll (2), and an end plate (3a) of the movable scroll (3) and a frame (4) supporting the end plate (3a). ), An annular thrust plate (7) for thrust-supporting the end plate (3a) is interposed, and a long hole-like fitting for fitting the boss portion (3b) of the movable scroll (3). A ring main body (80) having a fitting hole (80a), and a rising direction extending radially outward from the major axis side of the ring main body (80) to the surface side of the thrust plate (7), and the movable scroll (3). ) A pair of first keys (81, 81) slidably engaged with the guide grooves (31, 31), and the thrust plate (7) radially outward from the minor axis side of the ring body (80). ) Extends flatly on the back side of Guide grooves of Kika構 (4) (4
1, 41) and a pair of second keys (8
2, 82) and an Oldham ring (8) with the second key (82, 82) on the inner peripheral edge of the thrust plate (7).
A scroll type fluid machine characterized in that a notch (72) is provided on the back surface side of the scroll type fluid machine.