JPH0522077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid machine used as a compressor of a refrigeration system.

(Prior Art) A conventional scroll type fluid machine of this type is described in, for example, Japanese Unexamined Patent Publication No. 58-54299, and as shown in FIG. supporting the housing 4;
A fixed scroll 2 is fixed above the housing 4, and a revolving scroll 3 is disposed below the fixed scroll 2 to face each other via a thrust bearing 50, and an oil supply hole 5a is provided inside the housing 4. A transmission mechanism 7 and an Oldham ring 11 that support a drive shaft 5 vertically through a bearing 6, and interlock and connect the drive shaft 5 and the revolving scroll 3 to a storage chamber 4a provided in the housing 4. is interposed.

Thus, when compressing fluid by the scroll-type fluid machine, the revolving scroll 3 is rotated through the transmission mechanism 7 by the rotational drive of the drive shaft 5.
The fixed scroll 2 is driven to revolve, and the gas fluid sucked into the housing 1 is supplied between the scrolls 2 and 3 to be compressed, and when the gas fluid is compressed, the drive shaft Lubricating oil is pumped up from an oil reservoir provided at the bottom of the casing 1 through an oil supply hole 5a formed in 5, and is supplied to the bearing 6 of the drive shaft 5 and the housing 4 and other oil supply points. .

(Problems to be Solved by the Invention) In the scroll-type fluid machine as described above, when the fluid is compressed, the lubricating oil supplied to the oil supply point flows out into the storage chamber 4a of the housing 4. . That is, the oil that wets the sliding portion of the transmission mechanism 7 is scattered outward due to the centrifugal force accompanying the rotational movement of the transmission mechanism 7.

However, the storage chamber 4a of the housing 4
Since the inner wall 4b is formed vertically and does not have a gas-liquid separation function, the lubricating oil that has leaked into the storage chamber 4a flows upward through the inner wall 4b and is damaged by the thrust bearing 50. The problem is that the suction gas is sucked into the scrolls 2 and 3 from the suction passage through gaps such as grooves and sliding parts of the Oldham ring 11, causing liquid compression and causing oil to rise in the oil sump. It was hot.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to utilize the inner wall of the storage chamber provided in the housing to direct the lubricating oil flowing into the storage chamber into the suction gas suction path. A scroll-shaped fluid that can reliably prevent fluid from flowing into the gaps between the scrolls and supply only gas fluid to both scrolls, thereby causing liquid compression and oil leakage. Our goal is to provide machinery.

(Means for Solving the Problems) The scroll-type fluid machine of the present invention is constructed as shown in FIG. 1, and includes a housing 4, a fixed scroll 2 fixed to the housing 4, and a The revolving scroll 3 facing each other, a drive shaft 5 disposed vertically below the revolving scroll 3, and a driving shaft 5 interposed between the driving shaft 5 and the revolving scroll 3, A transmission mechanism 7 that transmits information to the revolving scroll 3 to drive the revolving scroll 3 and rotates following the drive shaft 5, and a lubricating means that supplies oil to a refueling point through the drive shaft 5, the transmission mechanism 7 In the scroll-type fluid machine housed in the storage chamber 4a of the housing 4, the inner wall 4b of the storage chamber 4a of the housing 4 is directed upwardly from below in the entire height direction facing the outer circumference of the transmission mechanism 7. The oil guide 4c is inclined inward and is provided with an oil guide 4c projecting inward from the upper part of the inner wall 4b.

(Function) Oil scattered outward by centrifugal force from the outer periphery of the rotating transmission mechanism 7 is directed upward from below and inwardly in the entire height direction facing the outer periphery of the transmission mechanism 7. It collides with the inner wall 4b, and is forced to flow downward due to the downward component force along the inclined surface of the inner wall 4b. or,
On the upper side of the inner wall 4b, the oil guide 4c also prevents oil from flowing upward. Therefore, the storage chamber 4
It is possible to reliably prevent lubricating oil from flowing out from a to both the scrolls 2 and 3.
3 is supplied with only gaseous fluid.

(Example) The scroll type fluid machine of the present invention will be described below with reference to the embodiments shown in the drawings.

The scroll-type fluid machine shown in FIG. 2 supports a fixed scroll 2 and a revolving scroll 3 facing the fixed scroll 2 at the inner upper part of a hermetic casing 1 via a housing 4 fixed to the casing 1. , and a motor M is disposed at a lower position of the casing 1, and the housing 4
A drive shaft 5 extending in the vertical direction is rotatably supported via a bearing 6, and the lower end of the drive shaft 5 is connected to the motor M, while the upper end of the drive shaft 5 and the revolving scroll 3 are connected to each other. A transmission mechanism 7 that drives the revolving scroll 3 as the drive shaft 5 rotates and rotates following the drive shaft 5 is installed in a storage chamber 4a provided in the upper center of the housing 4 between
is interposed.

The transmission mechanism 7 includes a counterweight 8 provided at a lower position of the drive shaft 5 facing the revolving scroll 3, and a swing link 9 having a balance weight 9a provided on the counterweight 8. The link 9 and the counterweight 8 are interlocked and connected via a drive pin 10a and a limit pin 10b, and the boss portion 3a of the revolving scroll 3 is supported by a bearing at a position eccentric to the drive shaft 5 of the swing link 9. I try to do that. Furthermore, an Oldham ring 1 is provided between the revolving scroll 3 and the housing 4.
1 is interposed, and the rotation of the revolving scroll 3 is prevented by the Oldham ring 11, so that the revolving scroll 3 is driven to revolve.

Further, the drive shaft 5 is provided with a lubricating means for lubricating a lubricating point such as a bearing 6 interposed between the drive shaft 5 and the housing 4. Oil supply hole 5a penetrating through
A pump (not shown) facing the bottom oil reservoir of the casing 1 is attached to the lower end of the oil supply hole 5a, and the lubricating oil pumped up by the pump is delivered to the bearing through the oil supply hole 5a. 6 and, as is clear from FIG. 1, oil is supplied to oil supply points such as the boss portion 3a and each sliding surface of the drive pin 10a in the transmission mechanism 7 that communicate with the upper opening of the oil supply hole 5a.

In the scroll-type fluid machine as described above, as shown in detail in FIG. An inner wall 4b is formed that slopes inwardly, and an oil guide 4c that projects inwardly is integrally formed on the upper part of this inner wall 4b.

In this way, the oil scattered outward from the outer periphery of the rotating transmission mechanism 7 due to centrifugal force is
The transmission mechanism 7 collides with the inner wall 4b, which is tilted upward and inward, in the entire height direction facing the outer circumference of the transmission mechanism 7, and is forced by a downward component force along the inclined surface of the inner wall 4b. flow downwards. Further, on the upper side of the inner wall 4b, the oil guide 4c also prevents oil from flowing upward.
Therefore, the lubricating oil enters the suction gas suction passage from the storage chamber 4a through gaps such as the sliding portion of the Oldham ring 11, and is not sucked into the scrolls 2 and 3 from this suction passage. It is.

(Effects of the Invention) As explained above, in the scroll type fluid machine of the present invention, the oil scattered outward by centrifugal force from the outer circumference of the rotating transmission mechanism 7 is directed toward the outer circumference of the transmission mechanism 7. The inner wall 4 slopes inward from the bottom to the top throughout the height direction.
b, the oil can be forced to flow downward by the downward component force along the inclined surface of the inner wall 4b, and the oil can also flow upward by the oil guide 4c on the upper side of the inner wall 4b. It can be prevented. Therefore, only gas fluid containing no lubricating oil can be supplied between the fixed scroll 2 and the revolving scroll 3, which prevents liquid compression from occurring in both the scrolls 2 and 3 and oil drainage. It has now been possible to reliably prevent this from happening.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the main parts of a scroll-type fluid machine according to the present invention, FIG. 2 is a partially cutaway side view showing the overall structure of the same scroll-type fluid machine, and FIG. 3 is a cross-sectional view showing a conventional example. It is. 2...Fixed scroll, 3...Revolving scroll, 4...Housing, 4a...Storage chamber, 4b...
...Inner wall, 4c...Oil guide, 5...Drive shaft, 7...
...Transmission mechanism.

Claims (1)

[Claims] 1 A housing 4, a fixed scroll 2 fixed to the housing 4, a revolving scroll 3 facing the fixed scroll 2, a drive shaft 5 disposed vertically below the revolving scroll 3, and this drive shaft 5 and the revolving scroll 3, the power of the drive shaft 5 is transmitted to the revolving scroll 3.
A transmission mechanism 7 that rotates following the drive shaft 5 and a lubrication means for supplying oil to a lubrication point through the drive shaft 5 are provided, and the transmission mechanism 7 is connected to the housing 4. This is a scroll-type fluid machine housed in a storage chamber 4a, in which the inner wall 4b of the storage chamber 4a in the housing 4 is oriented upwardly and inwardly over the entire height direction facing the outer circumference of the transmission mechanism 7. A scroll type fluid machine characterized in that an oil guide 4c is provided on the upper part of the inner wall 4b and projects inwardly.