JP3132328B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine mainly used for a refrigerator or a compressor of an air conditioner.

[0002]

2. Description of the Related Art In a conventional scroll-type fluid machine, in order to seal between scrolls of a compression element provided in a closed casing, oil in the casing is injected between the scrolls to seal the oil. Many of them used oil injection from the fixed scroll head.

[0003] However, when oil injection is performed from the end plate of the fixed scroll, an oil injection member for communicating an oil injection hole formed in the end plate of the fixed scroll with the oil reservoir is provided outside the casing, or A long oil supply passage for injection has to be separately formed in the support housing fixed to the casing and the fixed scroll by branching the passage from the oil supply passage of the drive shaft.

Accordingly, when a separate member is required, not only the number of parts is increased and the size is increased, but also an extra arrangement work is required, and a long oil supply passage is formed in the support housing and the fixed scroll. In this method, an oil groove is formed in a bearing for supporting a drive shaft, and the number of drilled portions is increased, so that not only a working operation but also a problem in manufacturing occurs due to the strength of the member.

Therefore, as described in, for example, Japanese Patent Application Laid-Open No. 3-217680, an annular oil groove formed in a thrust receiving portion for receiving the rear surface of the end plate of the movable scroll is used to supply the oil to the annular oil groove. The oil supply passage is shortened and easily formed by injecting oil through an oil injection hole formed in the end plate of a movable scroll.

More specifically, as shown in FIG. 9, a scroll type fluid machine that performs oil injection from the end plate of a movable scroll has a movable scroll A in which a spiral body A2 is protruded from a head plate A1 and a spiral body B2 also provided on a head plate B1. The projecting fixed scroll B is combined so that the spiral bodies A2 and B2 face each other.

The end plate A1 of the movable scroll A
A boss portion A3 is formed at the center of the back surface to fit the eccentric shaft portion C1 of the drive shaft C connected to the motor, and the movable scroll A is turned with the rotation of the drive shaft C. A support housing D having a bearing D1 for supporting a shaft C is fixed to a casing E, and the movable scroll A
The rear surface of the end plate A1 is supported by a thrust receiving portion D2 formed on the top surface of the support housing D.

Further, an annular oil groove D3 is provided in a thrust receiving portion D2 of the support housing D, and a main oil supply passage C formed in the drive shaft C is formed in the support housing D.
2 is formed, and an oil supply passage D4 communicating with the oil supply passage D4 is formed.
Is opened in the annular oil groove D3, the oil in the main oil supply passage C2 is supplied to the annular oil groove D3 via the oil supply passage D4, and the end plate A1 of the movable scroll A is turned by the turning motion of the end plate A1. When sliding on the thrust receiving portion D2, the oil in the annular oil groove D3 lubricates between the end plate A1 and the thrust receiving portion D2.

Further, the end plate A1 of the movable scroll A
As shown in FIGS. 9 and 10, two oil injection holes F, F penetrating in the thickness direction of the head plate A1 are provided at positions symmetrical with respect to the center of the movable scroll A, and the outlet side is provided. , A compression chamber G formed between the spiral bodies A2 and B2,
By providing an opening near the G inlet,
The oil supplied to the thrust receiving portion D2 from the annular oil groove D3 is introduced into the oil injection holes F, F, and the oil is injected into the suction inlets of the compression chambers G, G to thereby form the spiral bodies A2, B2. The space between them is oil sealed.

[0010]

The introduction of oil from the annular oil groove D3 to each of the oil injection holes F, F cannot be performed when the inside of the casing E is a low-pressure dome because differential pressure oiling cannot be performed. It is preferable that the oil is introduced by an oil pump by directly communicating with the annular oil groove D3 having a large amount of oil. However, since the oil injection holes F, F are located near the suction inlet of the compression chamber, The oil injection holes F, F do not directly overlap with the annular oil groove D3 when the orbiting scroll A is turned, and as a result, the oil injection holes F, F are
3 could not be communicated directly.

Therefore, conventionally, the movable scroll A
The inlet side of each of the oil injection holes F, F is opened on the back surface of the end plate A1, and the diameter of each of the oil injection holes F, F is larger than the diameter of each of the oil injection holes F. Counterbore portions F1 and F1 are formed at positions where they can communicate intermittently, and these counterbore portions F1 and F1 enlarge the inlet-side opening area of the oil injection holes F and F, thereby forming the oil injection holes F and F. When the movable scroll A makes a revolving motion, the counterbore portion F1,
F1 intermittently communicates with the annular oil groove D3 of the thrust receiving portion D2. At the time of this communication, the oil in the annular oil groove D3 is introduced into the oil injection holes F, F, and the oil injection hole F, F
Then, oil is injected into the suction inlets of the compression chambers G, G to seal the oil between the spiral bodies A2, B2.

However, the counterbore portions F1, F1
FIG. 8 shows that since the orbiting scroll A makes a revolving motion, the orbiting scroll A communicates only intermittently with the annular oil groove D3.
Counterbore F which is an opening area on the inlet side of oil injection holes F, F
As shown by the dashed line in the graph showing the trapped area of the annular oil groove D3 corresponding to the drive shaft rotation angle of 1, F1, the communication time of the oil injection holes F, F to the annular oil groove D3 is short and sufficient. A large amount of oil could not be injected.

In order to increase the communication area as much as possible, it is conceivable to increase the inner diameter of the counterbore portions F1 and F1. However, if the counterbore portions F1 and F1 are increased, the counterbore portions F1 and F1 become larger in diameter than the thrust receiving portion D2. The oil is discharged by being opened inward or outward in the direction, so that not only the oil injection cannot be performed well, but also the lubrication of the thrust receiving portion D2 cannot be performed well. F
1, F1 could not be made large.

Further, as shown by a dashed line in FIG. 8, when one counterbore F1 (a) communicates with the annular oil groove D3, the other counterbore F1 (b) does not communicate. Also, even when communicating, as shown in FIG.
Since the area where the counterbore portions F1 and F1 overlap the annular oil groove D3 fluctuates due to the swirling motion, there are times when the injection amount is large and when the communication is small,
A constant injection amount could not be obtained.

The present invention has been made in view of the above problems, and provides a scroll-type fluid machine having a simple structure and capable of supplying a sufficient amount of oil to a compression chamber to improve the efficiency of the compressor. The purpose is to:

[0016]

In order to achieve the above-mentioned object, the invention according to claim 1 is directed to an end plate 2 of a movable scroll 2.
An annular oil groove 53 for introducing oil pumped from an oil reservoir of the casing 1 which is a low-pressure dome is provided in a thrust receiving portion 52 for receiving the back surface of the movable scroll 2 and penetrates through the end plate 21 of the movable scroll 2 in the thickness direction of the end plate 21. In the scroll type fluid machine provided with the oil injection hole 7 that can communicate with the annular oil groove 53, the inlet-side opening area of the oil injection hole 7 is formed on the back surface of the end plate 21 of the movable scroll 2. The concave groove 9 which expands in the circumferential direction is provided.

According to a second aspect of the present invention, the oil injection hole 7 is provided.
Is composed of a first oil injection hole 71 and a second oil injection hole 72 that are symmetrical with respect to the center of the orbiting scroll 2, and the first and second oil injection holes 71, 72 are formed by grooves 9. They communicated with each other.

According to the third aspect of the present invention, the concave groove 9 is formed from an annular groove 91 having a center at the center of the orbiting scroll 2.

According to a fourth aspect of the present invention, in the third aspect of the invention, the radius of the annular groove 91 is a value obtained by adding the radius of the orbital scroll to the radius of the annular oil groove 53.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the radius of the annular groove 91 is changed to the annular oil groove 5.
That is, the radius of the movable scroll 2 is reduced to the radius of 3.

According to a sixth aspect of the present invention, the concave groove 9 is a partial arc groove 92 having both ends in the longitudinal direction closed.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the partial arc groove 92 is provided in the movable scroll 2.
Is formed with a radius obtained by adding the radius of the annular oil groove 53 to the radius of the orbiting of the orbiting scroll with the center of the center as the center.

According to an eighth aspect of the present invention, in the sixth aspect of the present invention, the partial arc groove 92 is provided in the movable scroll 2.
Is formed with a radius obtained by subtracting the turning radius of the orbiting scroll from the radius of the annular oil groove 53 around the center of the circular oil groove 53.

[0024]

According to the first aspect of the present invention, a concave groove 9 is provided on the back surface of the end plate 21 of the movable scroll 2 so as to enlarge the inlet-side opening area of the oil injection hole 7 in the circumferential direction of the movable scroll 2. When oil is injected from the movable scroll 2 side, the revolving motion of the movable scroll 2
Even if the position of the oil injection hole 7 with respect to the annular oil groove 53 is displaced, the communication area of the oil injection hole 7 with the annular oil groove 53 can be expanded via the concave groove 9, so that the oil injection Sufficient oil can be injected from the hole 7 into the compression chamber formed between the scrolls 2 and 3.

Therefore, a sufficient amount of oil can be injected from the oil injection hole 7 into the compression chamber while the injection oil supply passage can be made simple and short to simplify the structure. It is possible to seal the interior of the compression chamber with oil satisfactorily, reduce gas leakage during the compression stroke, and improve the efficiency of the compressor.

According to the second aspect of the present invention, the oil injection hole 7
Is composed of a first oil injection hole 71 and a second oil injection hole 72 that are symmetrical with respect to the center of the orbiting scroll 2, and the first and second oil injection holes 71, 72 are formed by grooves 9. Since they are communicated with each other, the oil introduced from the annular oil groove 53 into the concave groove 9 can be introduced into each of the first and second oil injection holes 71, 72, so that both oil injection holes are simultaneously formed. 7
Oil can be injected from 1,72 into the compression chamber, and a better oil seal can be achieved.

According to the third aspect of the present invention, the concave groove 9 is
Since the annular groove 91 having the center at the center of the orbiting scroll 2 is formed, the groove 9 can be formed more easily, and the enlarged area of the orbiting groove 9 in the circumferential direction of the orbiting scroll 2 can be maximized. Therefore, better oil injection can be performed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the radius of the annular groove 91 is changed to the annular oil groove 53.
Since the value obtained by adding the turning radius of the movable scroll 2 to the radius of the movable scroll 2, even if the movable scroll 2 revolves, the annular groove 91 is always communicated with the annular oil groove 53, and Oil injection can always be performed into the compression chamber, and stable refueling can be performed.

According to a fifth aspect of the present invention, in the third aspect of the invention, the radius of the annular groove 91 is set to a value obtained by subtracting the turning radius of the movable scroll 2 from the radius of the annular oil groove 53. Even if the orbiting scroll 2 revolves, the annular groove 91 is always in communication with the annular oil groove 53, so that oil can always be injected from the oil injection hole 7 into the compression chamber and stable oil supply can be performed. .

According to the sixth aspect of the present invention, the concave groove 9 is
Since the partial arc groove 92 closed at both ends in the length direction,
By setting the communication area of the oil injection hole 7 to the annular oil groove 53 to a desired width, the oil injection amount can be adjusted.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the partial arc groove 92 is formed by adding the turning radius of the movable scroll to the radius of the annular oil groove 53 around the center of the movable scroll 2. During the revolution of the orbiting scroll 2, the communication between the partial arc groove 92 and the annular oil groove 53 is started at one end in the circumferential direction of the partial arc groove 92. And the other end can be reached while always communicating with each other, and the oil injection amount can be adjusted more favorably.

According to an eighth aspect of the present invention, in the invention of the sixth aspect, the turning radius of the orbiting scroll is reduced to the radius of the annular oil groove 53 around the center of the orbiting scroll 2 in the partial arc groove 92. During the revolution of the orbiting scroll 2, the communication between the partial arc groove 92 and the annular oil groove 53 is started at one end in the circumferential direction of the partial arc groove 92. And the other end can be reached while always communicating with each other, and the oil injection amount can be adjusted more favorably.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment will be described. The scroll-type fluid machine shown in FIG. 1 is a low-pressure dome-type scroll compressor used as a refrigerator, in which a compression element CF is provided inside an upper part of a closed casing 1 and a motor M is provided inside a lower part of the casing 1. I have.

The compression element CF is provided on the end plate 21 with the spiral body 2.
The scrolls 2 and 3 are combined so that the scrolls 22 and 32 are opposed to each other, and the movable scroll 2 includes a movable scroll 2 having the scrolls 2 projecting therefrom and a fixed scroll 3 also having a scroll 32 projecting from the end plate 31. End plate 21 of scroll 2
Further, a boss 23 is formed for fitting the eccentric shaft 41 of the drive shaft 4 connected to the motor M, so that the orbiting scroll 2 is turned in conjunction with the rotation of the drive shaft 4.

Further, a support housing 5 having a bearing 51 for supporting the drive shaft 4 is fixed in the casing 1, and the fixed scroll 3 is fixed to the support housing 5.
And the end plate 21 of the movable scroll 2
Is supported by a thrust receiving portion 52 formed on the top surface of the support housing 5.

A partition plate 6 is disposed inside the casing 1 above the fixed scroll 3 and is formed by the partition plate 6 on the fixed scroll 3 above the partition plate 6. A high-pressure chamber 12 that opens the discharge port 33 and opens the external discharge pipe 11 is a low-pressure chamber in which a suction pipe 13 opens below the partition plate 6 and the compression element CF and the motor M are arranged. 14, the casing 1 is formed as a low-pressure dome.

An Oldham ring 15 is disposed between the end plate 21 of the orbiting scroll 2 and the support housing 5, and the Oldham ring 15 prevents the orbiting of the orbiting scroll 2 from rotating. 2 is revolved with respect to the fixed scroll 3. Reference numeral 16 denotes an oil separator fixed to the partition plate 6.

Therefore, the movable scroll 2 revolves with respect to the fixed scroll 3 by the rotation of the drive shaft 4 accompanying the driving of the motor M, and the revolving motion causes the suction pipe 13 to rotate.
Then, the low-pressure gas sucked into the low-pressure chamber 14 is sucked into the compression chamber 17 formed by the spiral bodies 22 and 32 of the scrolls 2 and 3, and the sucked gas is compressed,
It is discharged from the discharge port 33 to the high-pressure chamber 12 and discharged from the external discharge pipe 11 to the outside of the casing 1.

At the lower end of the drive shaft 4, an oil supply pump (not shown) including a positive displacement oil pump and the like communicating with oil collected at the bottom of the casing 1 is provided.
The oil pump pumps up oil collected at the bottom of the casing 1 into a main oil supply passage 42 formed through the drive shaft 4 in the axial direction, so that the bearing 51 in the support housing 5 and the boss 23 of the movable scroll 2 and the Eccentric shaft part 41
The oil is supplied to each sliding portion such as between the above.

Further, the thrust receiving portion 52 of the support housing 5 has an annular shape, and an annular oil groove 53 having the center O ₁ of the drive shaft 4 as a center is provided at a radially intermediate portion of the thrust receiving portion 52. And one end of the support housing 5 branches off from the main oil supply passage 42 of the drive shaft 4 and communicates with a branch passage 43 that is opened on the inner peripheral surface of the bearing 51. An oil supply passage 54 that opens into the inside of the oil passage 53 is formed, and oil is supplied from the main oil supply passage 42 to the annular oil groove 53 through the branch passage 43 and the oil supply passage 54 so as to lubricate the thrust receiver 52. I have.

The end plate 21 of the orbiting scroll 2 is provided with an oil injection hole 7 penetrating in the thickness direction of the end plate 21. The first oil injection hole 71 and the second oil injection hole 72 are symmetrical. The oil injection holes 71 and 72 have their outlet sides formed in the compression chambers 17 formed between the spiral bodies 22 and 32. It is provided so that it may open near two suction inlets, respectively.

In this embodiment, the oil injection hole 7
Since the drilling positions of the oil injection holes 71 and 72 are located near the suction inlet of the compression chamber, the oil injection holes 71 and 72 do not directly overlap the annular oil groove 53 when the orbiting scroll 2 revolves. Since the oil injection holes 71 and 72 cannot communicate directly with the annular oil groove 53, the inlet sides of the oil injection holes 71 and 72 are opened on the back surface of the end plate 21 of the movable scroll 2, and the oil injection holes 71 and 72 are opened. The counterbore portions 8 are formed at a position larger than the diameter of the movable scroll 2 and capable of intermittently communicating with the annular oil groove 53 during the turning movement of the movable scroll 2.

Further, as shown in FIG. 1 and FIG. 2, the back side of the end plate 21 of the movable scroll 2 communicates with the counterbore portions 8 and 8 so that the opening area on the inlet side of the oil injection hole 7 is formed. The movable scroll 2 is provided with a groove 9 which is enlarged in the circumferential direction.

The counterbore portions 8, 8 and the concave groove 9 enlarge the inlet-side opening area of the oil injection holes 71, 72, so that the orbiting of the movable scroll 2 causes the oil injection holes 71, 72 to move. The communication area of the thrust receiving portion 52 with the annular oil groove 53 is expanded, and at the time of this communication, the oil in the annular oil groove 53 is introduced into the oil injection holes 71 and 72 so that the oil injection hole 71 , 72 to each of the suction inlets of the compression chamber 17 so that each spiral body 2
An oil seal is provided between 2 and 32 to prevent gas leakage.

The concrete description of the groove 9 is as follows.
The center of the drive shaft 4 which is the center of the annular oil groove 53 of the support housing 5 is O ₁ , the radius of a circle drawn at the center of the groove width of the annular oil groove 53 is R ₁ , and the center of the movable scroll 2 is Is O ₂ , and the turning radius of the movable scroll 2 is Ror
When the end plate 21 the back surface of the orbiting scroll 2, there is for forming the groove 9 consisting of annular groove 91 to match the center to center O ₂ of the movable scroll 2, the groove 9, The first and second oil injection holes 71 and 72 are communicated with each other by the concave grooves 9 by communicating with the respective counterbore portions 8 and 8.

Further, the concave groove 9 is defined by the radius R ₂ of the annular groove 91, in this embodiment, the radius of the circle drawn by the center of the width of the annular groove 91 and the radius R _{1 of the} annular oil groove 53. And the turning radius Ror of the orbiting scroll 2 is added to the value so that a circle larger than the annular oil groove 53 is drawn.

As described above, the annular groove 91 is set to the turning radius Ror of the movable scroll 2 by the radius R ₁ of the annular oil groove 53.
By that drawn by a radius R ₂ plus, during orbital motion of the movable scroll 2, the annular groove 91 of the annular oil groove 5
3 can always be communicated.

3 to FIG. 6 show that the movable scroll 2 and the thrust receiving portion 52 at every 90 degrees of eccentric rotation of the eccentric shaft portion 41 of the drive shaft 4 are shown in FIG. 3 to FIG. shows the positional relationship between the annular oil groove 53, since the center of the annular oil groove 53 is made to coincide with the center O ₂ of the drive shaft 4, the annular groove 91, the radius R of the annular oil groove 53 by drawing a radius R ₂ plus turning radius Ror of the movable scroll 2 to _1, as shaded portion shown in FIGS. 3 to 6, in the revolution of the movable scroll 2,
The annular groove 91 can always communicate with the annular oil groove 53.

Therefore, as shown by the solid line in the graph of FIG. 8, the area for catching the annular oil groove 53 in the opening area on the inlet side of the oil injection holes 71, 72, that is, the counterbore portions 8, 8 and the concave The area of the overlapping portion of the groove 9 with the annular oil groove 53 can be always constant irrespective of the rotation angle of the drive shaft 4, and the oil in the annular oil groove 53 is Is always taken into the concave groove 9,
The oil in the concave groove 9 is always introduced into the oil injection holes 7.

As described above, on the back surface of the end plate 21 of the movable scroll 2, not only the counterbore portions 8, 8 but also the opening area on the inlet side of the oil injection hole 7 is further extended in the circumferential direction of the movable scroll 2. Since the enlarged groove 9 is also formed, the communication area between the annular oil groove 53 provided in the thrust receiving portion 52 and the oil injection holes 71 and 72 can be enlarged in the circumferential direction of the movable scroll 2.

That is, when oil is injected from the movable scroll 2 side, even if the position of the oil injection hole 7 with respect to the annular oil groove 53 is displaced by the revolution of the movable scroll 2, the oil is injected through the concave groove 9. Since the communication area of the oil injection hole 7 with the annular oil groove 53 can be expanded in the circumferential direction, sufficient oil can be supplied from the oil injection hole 7 to the compression chamber 17 formed between the scrolls 2 and 3. It can be injected.

Therefore, a sufficient amount of oil can be injected from the oil injection hole 7 into the compression chamber while the injection oil supply passage can be made simple and short to simplify the structure. This makes it possible to seal the interior of the compression chamber 17 with oil satisfactorily, reduce gas leakage during the compression stroke, and improve the efficiency of the compressor.

Further, in the first embodiment, the oil injection hole 7
Is composed of a first oil injection hole 71 and a second oil injection hole 72 that are symmetrical with respect to the center of the orbiting scroll 2, and the first and second oil injection holes 71, 72 are formed by grooves 9. Since they are communicated with each other, the oil introduced from the annular oil groove 53 into the concave groove 9 can be introduced into each of the first and second oil injection holes 71, 72, so that both oil injection holes are simultaneously formed. 7
Oil can be injected from 1,72 into the compression chamber 17 and a better oil seal can be performed.

Further, since the concave groove 9 is formed from the annular groove 91 having the center at the center O ₂ of the movable scroll 2, the concave groove 9 can be easily formed without considering the circumferential length of the concave groove 9. While the concave groove 9 can be formed, the circumferentially enlarged area of the concave groove 9 can be maximized, so that better oil injection can be performed.

In particular, in the first embodiment, the radius R ₂ of the annular groove 91 is changed to the radius R ₁ of the
The orbital radius Ror is added to the value, so that even if the orbiting scroll 2 revolves, the annular groove 91 is always in communication with the annular oil groove 53, and the oil injection hole 7 allows the compression chamber 17 Oil injection can be performed and stable refueling can be performed.

[0056] In the first embodiment described above, the radius R ₂ of the annular groove 91, although the value obtained by adding the turning radius Ror of the movable scroll 2 in the radial R ₁ of the annular oil groove 53, the the radius of the annular groove 91, may be a value obtained by subtracting the turning radius Ror of the movable scroll 2 in the radial R ₁ of the annular oil groove 53, may be thus, when the revolution of the movable scroll 2,
Since the annular groove 91 is always communicated with the annular oil groove 53, oil injection from the oil injection hole 7 to the compression chamber 17 can be always performed, and stable oil supply can be performed.

In the first embodiment, the annular groove 9 is used.
1, the first and second oil injection holes 71 and 72 are communicated with each other, but two annular grooves having different radii as described above are formed, and one of the oil injection holes has a large diameter through a counterbore. The other oil injection hole may be communicated with the small annular groove through the counterbore part.

Next, a second embodiment will be described with reference to FIG. In the second embodiment, the concave groove 9 is a partial arc groove 92 in which both ends in the longitudinal direction are closed, and the end plate 21 of the movable scroll 2 is provided in the end plate 21 in the same manner as the first embodiment.
First symmetrical with respect to the center of the movable scroll 2
An oil injection hole 71 and a second oil injection hole 72 are provided, and the two partial arc grooves 92, 92 are formed so as to communicate with the first and second oil injection holes 71, 72 separately. I have.

[0059] Furthermore, the partial arc groove 92 is around the center O ₂ of the movable scroll 2, a radius R ₂ of the value obtained by adding the turning radius Ror of the movable scroll radius R ₁ of the annular oil groove 53 The movable scroll 2
During the revolution, the communication between the partial arc groove 92 and the annular oil groove 53 is made to reach the other end while communicating continuously along the arc from the time when the communication is made at one end in the circumferential direction of the partial arc groove 92. Like that.

The length of the arc is determined by the compression chamber 1
7 is set to a desired length in accordance with the amount of oil introduced into the inside of the oil groove 7.
The amount of oil to be introduced from is adjusted.

As described above, in the second embodiment, since the concave groove 9 is a partial arc groove 92 in which both ends in the longitudinal direction are closed, the annular oil groove 5 of each of the oil injection holes 71 and 72 is formed.
3 can be set to a desired size, and the amount of oil injection can be adjusted.

Further, the partial arc groove 92 is formed with a radius R ₂ of a value obtained by adding the turning radius Ror of the movable scroll to the radius R ₁ of the annular oil groove 53 around the center O ₂ of the movable scroll 2. During the revolution of the orbiting scroll 2, the communication between the partial arc groove 92 and the annular oil groove 53 is always established along the arc from the time when the communication is established at one end in the circumferential direction of the partial arc groove 92. However, the oil injection amount can be adjusted to the other end, and the oil injection amount can be adjusted more favorably.

In the second embodiment, the partial arc groove 92
And the turning radius Ror of the movable scroll around the center O ₂ of the movable scroll 2 and the radius R ₁ of the annular oil groove 53.
It was formed with a radius R ₂ of the value obtained by adding said about the center O ₂ of the movable scroll 2, and formed with a radius of a value obtained by subtracting the radius R ₁ of the turning radius Ror of the movable scroll of the annular oil groove 53 Also in this case, during the revolution of the orbiting scroll 2, the communication between the partial arc groove 92 and the annular oil groove 53 is started at the one end in the circumferential direction of the partial arc groove 92. And the other end can be reached while always communicating along the path, so that the oil injection amount can be favorably adjusted.

In the above embodiment, the movable scroll 2
In the above description, the two oil injection holes 71 and 72 are formed, but the invention is also applicable to a case where only one oil injection hole is formed or a case where a plurality of oil injection holes are formed.

[0065]

According to the first aspect of the present invention, on the back surface of the end plate 21 of the movable scroll 2, a groove 9 for enlarging the opening area on the inlet side of the oil injection hole 7 in the circumferential direction of the movable scroll 2 is provided. When oil is injected from the movable scroll 2 side, even if the position of the oil injection hole 7 with respect to the annular oil groove 53 is displaced by the revolving motion of the movable scroll 2, the oil is injected through the groove 9. Since the communication area of the oil injection hole 7 with the annular oil groove 53 can be expanded, sufficient oil can be injected from the oil injection hole 7 into the compression chamber formed between the scrolls 2 and 3.

Therefore, while making the oil supply passage for injection simple and short to simplify the construction, a sufficient amount of oil injection from the oil injection hole 7 to the compression chamber is performed. It is possible to seal the interior of the compression chamber with oil satisfactorily, reduce gas leakage during the compression stroke, and improve the efficiency of the compressor.

According to the second aspect of the present invention, the oil injection hole 7 is constituted by the first oil injection hole 71 and the second oil injection hole 72 which are symmetrical with respect to the center of the movable scroll 2. Since the first and second oil injection holes 71 and 72 are communicated with each other through the concave groove 9, the oil introduced from the annular oil groove 53 into the concave groove 9 is supplied to the first and second oil injection holes. 71,72
The oil can be injected into the compression chamber from both oil injection holes 71 and 72 at the same time, and a better oil seal can be performed.

According to the third aspect of the present invention, the groove 9
An annular groove 9 having a center at the center of the movable scroll 2.
Since the groove 1 is formed from the groove 1, the groove 9 can be formed more easily, and the enlarged area of the groove 9 in the circumferential direction of the orbiting scroll 2 can be maximized, so that better oil injection can be performed.

According to the fourth aspect of the invention, in the third aspect of the invention, the radius of the annular groove 91 is set to a value obtained by adding the radius of the annular oil groove 53 to the turning radius of the movable scroll 2. Even if the orbiting scroll 2 revolves, the annular groove 91 is always communicated with the annular oil groove 53, so that oil can always be injected from the oil injection hole 7 into the compression chamber, and stable oil supply can be performed. .

According to the fifth aspect of the present invention, in the third aspect of the invention, the radius of the annular groove 91 is set to a value obtained by subtracting the turning radius of the movable scroll 2 from the radius of the annular oil groove 53. Therefore, even if the orbiting scroll 2 revolves, the annular groove 91 is always in communication with the annular oil groove 53, so that oil can always be injected from the oil injection hole 7 into the compression chamber, and stable oil supply can be performed. It is.

According to the sixth aspect of the present invention, the groove 9
Is formed into a partially arcuate groove 92 with both ends in the length direction closed, so that the communication area of the oil injection hole 7 with the annular oil groove 53 is set to a desired size, and the oil injection amount can be adjusted. Becomes

According to the seventh aspect of the present invention, in the sixth aspect of the present invention, the partial arc groove 92 is formed so that the turning radius of the movable scroll is set to the radius of the annular oil groove 53 around the center of the movable scroll 2. During the revolution of the orbiting scroll 2, the partial arc groove 9 is formed.
2 and the annular oil groove 53 are connected to the partial arc groove 92.
From one end in the circumferential direction to the other end while always communicating along the arc, and the oil injection amount can be adjusted more favorably.

According to an eighth aspect of the present invention, in the invention of the sixth aspect, the partial arc groove 92 is formed so that the turning radius of the movable scroll is set to the radius of the annular oil groove 53 around the center of the movable scroll 2. During the revolution of the orbiting scroll 2, the partial arc groove 9 is formed.
2 and the annular oil groove 53 are connected to the partial arc groove 92.
From one end in the circumferential direction to the other end while always communicating along the arc, and the oil injection amount can be adjusted more favorably.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a first embodiment of a scroll type fluid machine of the present invention.

FIG. 2 is a bottom view of the end plate of the movable scroll according to the first embodiment.

FIG. 3 is an explanatory view showing a communication state between an annular oil groove and a concave groove in the first embodiment.

FIG. 4 is an explanatory view showing a communication state between an annular oil groove and a concave groove in the first embodiment.

FIG. 5 is an explanatory view showing a communication state between an annular oil groove and a concave groove in the first embodiment.

FIG. 6 is an explanatory diagram showing a communication state between an annular oil groove and a concave groove in the first embodiment.

FIG. 7 is a bottom view of the end plate of the movable scroll according to the second embodiment.

FIG. 8 is a graph showing the annular oil groove catching area in the opening area on the inlet side of the oil injection hole corresponding to the rotation angle of the drive shaft.

FIG. 9 is a partial sectional view of a conventional scroll type fluid machine.

FIG. 10 is an explanatory diagram showing a positional relationship between an annular oil groove formed in a thrust receiving portion and an oil injection hole formed in a movable scroll end plate in a conventional scroll type fluid machine.

[Explanation of symbols]

 Reference Signs List 1 casing 2 movable scroll 21 end plate 52 thrust receiving portion 53 annular oil groove 7 oil injection hole 71 first oil injection hole 72 second oil injection hole 9 concave groove 91 annular groove 92 partial arc groove

(56) References JP-A-6-264876 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (8)

(57) [Claims] An annular oil groove (53) for introducing oil pumped from an oil reservoir of a casing (1) formed as a low pressure dome is provided in a thrust receiving portion (52) for receiving a rear surface of a head (21) of a movable scroll (2). A scroll type in which an oil injection hole (7) is provided in the end plate (21) of the orbiting scroll (2) in the thickness direction of the end plate (21) and can communicate with the annular oil groove (53). In the fluid machine, the inlet-side opening area of the oil injection hole (7) is provided on the back surface of the end plate (21) of the movable scroll (2).
A scroll type fluid machine characterized by having a concave groove (9) for enlarging in the circumferential direction. 2. The movable scroll (2), wherein the oil injection hole (7) has a movable scroll (2).
A first oil injection hole (71) and a second oil injection hole (72), which are symmetrical with respect to the center portion of the first oil injection hole (71). 2. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine communicates with each other. 3. The scroll-type fluid machine according to claim 1, wherein the groove (9) comprises an annular groove (91) centered on the center of the orbiting scroll (2). The radius of the annular groove (91) is adjusted by adjusting the radius of the annular oil groove (5).
The scroll type fluid machine according to claim 3, wherein a value obtained by adding a turning radius of the movable scroll to the radius of (3) is used. The radius of the annular groove (91) is adjusted by adjusting the radius of the annular oil groove (5).
4. The scroll type fluid machine according to claim 3, wherein the radius of the movable scroll is reduced to the radius of the third aspect. 6. The scroll type fluid machine according to claim 1, wherein the concave groove (9) comprises a partially arcuate groove (92) closed at both ends in the longitudinal direction. 7. A partial arc groove (92) is formed with a radius obtained by adding a turning radius of the movable scroll (2) to a radius of the annular oil groove (53) around the center of the movable scroll (2). 7. The scroll type fluid machine according to claim 6, wherein: 8. A partial arc groove (92) is formed with a radius obtained by subtracting the turning radius of the movable scroll (2) from the radius of the annular oil groove (53) around the center of the movable scroll (2). 7. The scroll type fluid machine according to claim 6, wherein: