JPH08261178A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE: To enhance sealability in a compressed chamber so as to improve efficiency of a compressor, in which a structure is simplified further so that a sufficient amount of oil can be supplied into the compression chamber from an end plate reverse surface side of a movable scroll. CONSTITUTION: An annular oil groove 53 of introducing oil pumped up from an oil reservoir of a casing 1, formed in a low pressure dome, is provided in a thrust receiving part 52 of stopping a reverse surface of an end plate 21 of a movable scroll 2. An oil injection hole 7, inserted in the end plate 21 in its thickness direction to be made communicatable with the annular groove 53, is provided in the end plate 21 of the movable scroll 2. A recessed groove 9, enlarging an inlet side opening region of the oil injection hole 7 in a circumferential direction of the movable scroll 2, is provided in a reverse surface of the end plate 21 of the movable scroll 2.

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 refrigerant compressor of a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art In a conventional scroll type fluid machine, in order to seal between the scrolls of a compression element housed in a hermetically sealed casing, oil in the casing is injected between the scrolls to form an oil seal. Many of them used oil injection from the end plate of a fixed scroll.

However, when oil injection is performed from the end plate of the fixed scroll, an oil injection member for communicating the 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 in the casing and the fixed scroll by branching the passage from the oil supply passage of the drive shaft.

Therefore, when a separate member is required, not only the number of parts increases and the size increases, but also an extra work is required, and when a long oil supply passage is formed in the support housing and the fixed scroll. In the above, an oil groove was formed in the bearing that supports the drive shaft, and there were many holes to be drilled, which caused problems in manufacturing not only in machining work but also in terms of 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 back surface of the end plate of the movable scroll is utilized and is supplied to this annular oil groove. It is known that the oil supply passage is short and easy to be formed by injecting the oil into the end plate of the movable scroll through the oil injection hole.

That is, as shown in FIG. 9, a scroll type fluid machine for performing oil injection from the end plate of a movable scroll has a movable scroll A having a scroll A2 protruding from the end plate A1, and a scroll B2 similarly attached to the end 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 into which the eccentric shaft portion C1 of the drive shaft C connected to the motor is fitted is formed in the center of the back surface, and the movable scroll A is swung as the drive shaft C is rotationally driven, and the drive is performed. A support housing D having a bearing D1 for supporting the shaft C is fixed to a casing E, and the movable scroll A
The rear surface of the end plate A1 is supported by the thrust receiving portion D2 formed on the top surface portion of the support housing D.

Moreover, an annular oil groove D3 is provided in the thrust receiving portion D2 of the support housing D, and a main oil supply passage C formed in the drive shaft C is provided in the support housing D.
The oil supply passage D4 communicating with 2 is formed, and this oil supply passage D4
To the annular oil groove D3, the oil in the main oil supply passage C2 is supplied to the annular oil groove D3 through the oil supply passage D4, and the end plate A1 of the movable scroll A is swung to move 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 is
As shown in FIGS. 9 and 10, the two oil injection holes F, F penetrating in the thickness direction of the end plate A1 are symmetrical with respect to the center of the movable scroll A, and the outlet side is , A compression chamber G formed between the spiral bodies A2, B2,
By installing it near the G intake port,
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 so that the spiral bodies A2, B2. The space is oil-sealed.

[0010]

By the way, the introduction of oil from the annular oil groove D3 into the oil injection holes F, F cannot be performed by differential pressure oil supply when the inside of the casing E is a low pressure dome. , It is preferable that the oil is introduced directly by communicating with the annular oil groove D3 having a large amount of oil, but the oil injection holes F, F are formed 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 turns, and as a result, the oil injection holes F, F are not overlapped with each other.
I could not communicate directly with 3.

Therefore, in the conventional art, the movable scroll A is used.
On the back surface of the end plate A1 of each of the oil injection holes F, F is opened, and the diameter of the oil injection holes F, F is larger than the diameter of the oil injection holes F, F. The counterbore portions F1 and F1 are formed at positions where they can be communicated intermittently, and the counterbore portions F1 and F1 enlarge the inlet side opening area of the oil injection holes F and F to form the oil injection holes F and F. , When the movable scroll A orbits, the spot facing portion F1,
It is made to intermittently communicate with the annular oil groove D3 of the thrust receiving portion D2 via F1, and at the time of this communication, the oil of the annular oil groove D3 is introduced into the oil injection holes F, F, and the oil injection hole F, F
Therefore, oil is injected into the suction inlets of the compression chambers G and G to seal the oil between the spiral bodies A2 and B2.

However, the spot facing portions F1 and F1 are
Since the movable scroll A makes an orbiting motion, the movable scroll A communicates with the annular oil groove D3 only intermittently.
Of the counterbore part F which is the inlet side opening area of the oil injection holes F, F
As indicated by the dashed line in the graph showing the trapped area of the annular oil groove D3 corresponding to the drive shaft rotation angles of 1 and F1, the communication time of the oil injection holes F and F to the annular oil groove D3 is short and sufficient. It was not possible to inject a large amount of oil.

Therefore, it is conceivable to increase the inner diameter of the counterbore portions F1 and F1 in an attempt to make the communication area as wide as possible. However, when the inner diameter of the counterbore portions F1 and F1 is increased, the diameter of the thrust receiving portion D2 is increased. Since the oil is discharged by opening inward or outward in the direction, oil injection cannot be performed well, and the thrust receiving portion D2 cannot be lubricated well. F
It was not possible to take large values of 1 and F1.

Further, as shown by the one-dot chain line in FIG. 8, when one counterbore F1 (a) communicates with the annular oil groove D3, the other counterbore F1 (b) does not communicate. , And even when communicating, as shown in FIG.
Since the area where the spot facings F1 and F1 overlap the annular oil groove D3 varies due to the turning motion, there are cases where the injection amount is large and small during the communication,
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 object, the invention according to claim 1 provides an end plate 2 of a movable scroll 2.
(1) A thrust receiving portion (52) for receiving the back surface is provided with an annular oil groove (53) for introducing oil pumped up from an oil reservoir of a casing (1) which is a low pressure dome, and penetrates the end plate (21) of the movable scroll (2) in the thickness direction of the end plate (21). However, 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 provided on the back surface of the end plate 21 of the movable scroll 2. The groove 9 is provided to expand in the circumferential direction.

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 which are symmetrical with respect to the central portion of the movable scroll 2, and the first and second oil injection holes 71, 72 are formed by the concave groove 9. They communicated with each other.

According to the third aspect of the present invention, the concave groove 9 is formed by an annular groove 91 having a center at the center of the movable 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 set to a value obtained by adding the orbiting radius of the movable 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 invention, the radius of the annular groove 91 is set to the annular oil groove 5
This is the value obtained by subtracting the orbiting radius of the movable scroll 2 from 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 lengthwise direction closed.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the partial arc groove 92 is formed in the movable scroll 2.
The radius of the annular oil groove 53 is added to the radius of the orbiting scroll, and the radius of the orbit of the orbiting scroll is added to the center of the center.

According to an eighth aspect of the invention, in the invention according to the sixth aspect, the partial arc groove 92 is provided with a movable scroll 2
With the center of the center as the center, the radius of the annular oil groove 53 is reduced by the radius of the orbit of the movable scroll.

[0024]

According to the first aspect of the invention, since the back surface of the end plate 21 of the movable scroll 2 is provided with the concave groove 9 for enlarging 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 orbiting motion of the movable scroll 2 causes
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 through the concave groove 9, so that the oil injection is performed. Sufficient oil can be injected from the hole 7 into the compression chamber formed between the scrolls 2 and 3.

Therefore, while the oil supply passage for injection can be easily machined and shortened 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 satisfactorily seal the inside of the compression chamber with oil, reduce gas leakage in the compression stroke, and improve the efficiency of the compressor.

In the invention according to claim 2, the oil injection hole 7
Is composed of a first oil injection hole 71 and a second oil injection hole 72 which are symmetrical with respect to the central portion of the movable scroll 2, and the first and second oil injection holes 71, 72 are formed by the concave groove 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 and 72, so that both oil injection holes are simultaneously opened. 7
Oil can be injected into the compression chamber from 1, 72, and a better oil seal can be achieved.

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

According to a fourth aspect of the present invention, in the third aspect of the invention, the radius of the annular groove 91 is set to the annular oil groove 53.
Therefore, even if the movable scroll 2 revolves, the annular groove 91 is always communicated with the annular oil groove 53, and the oil injection hole 7 Oil can be constantly injected into the compression chamber and stable oil supply can be achieved.

According to the invention of claim 5, in the invention of claim 3, the radius of the annular groove 91 is set to a value obtained by subtracting the orbiting 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 can always be communicated with the annular oil groove 53, so that oil can be constantly injected from the oil injection hole 7 into the compression chamber, and stable oil supply can be performed. .

According to a sixth aspect of the invention, the concave groove 9 is
Since the partial arc groove 92 is formed by closing both ends in the length direction,
It is possible to adjust the amount of oil injection by setting the communication area of the oil injection hole 7 to the annular oil groove 53 to a desired width.

According to a seventh aspect of the invention, in the sixth aspect of the invention, the partial arc groove 92 is formed by adding the orbiting radius of the movable scroll to the radius of the annular oil groove 53 with the center of the movable scroll 2 as the center. Since it is formed with a radius of a value, the circular arc groove 92 and the annular oil groove 53 communicate with each other during the revolution of the orbiting scroll 2 from the time when they are communicated at one circumferential end of the partial circular groove 92. It is possible to reach the other end while always communicating along with, so that the oil injection amount can be adjusted even better.

According to an eighth aspect of the invention, in the invention of the sixth aspect, the orbiting radius of the movable scroll is reduced to the radius of the annular oil groove 53 with the partial arc groove 92 as the center of the movable scroll 2. Since it is formed with a radius of a value, the circular arc groove 92 and the annular oil groove 53 communicate with each other during the revolution of the orbiting scroll 2 from the time when they are communicated at one circumferential end of the partial circular groove 92. It is possible to reach the other end while always communicating along with, so that the oil injection amount can be adjusted even better.

[0033]

EXAMPLE First, a first example will be described. The scroll type fluid machine shown in FIG. 1 is a low pressure dome type scroll type compressor used as a refrigerator, in which a compression element CF is installed above the inside of a hermetic casing 1 and a motor M is installed below the inside of the casing 1. There is.

The compression element CF has the end plate 21 and the spiral body 2 attached thereto.
2 includes a movable scroll 2 projecting from it, and a fixed scroll 3 similarly having a scroll body 32 projecting from the end plate 31. The scrolls 2 and 3 are combined so that the scroll bodies 22 and 32 face each other, while the scroll is movable. End plate 21 of scroll 2
In addition, a boss portion 23 into which the eccentric shaft portion 41 of the drive shaft 4 connected to the motor M is fitted is formed, and the movable scroll 2 is rotated in conjunction with the rotational drive 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 to fix the fixed scroll 3 to the support housing 5.
Fixed to 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.

Further, a partition plate 6 is provided inside the casing 1 on the upper side of the fixed scroll 3, and the fixed scroll 3 is formed on the upper side of the partition plate 6 by the partition plate 6. The high-pressure chamber 12 in which the discharge port 33 is opened and the external discharge pipe 11 is opened, and the low-pressure chamber in which the suction pipe 13 is opened below the partition plate 6 and the compression element CF and the motor M are arranged. 14 is partitioned to form a low-pressure dome inside the casing 1.

An Oldham ring 15 is provided between the end plate 21 of the movable scroll 2 and the support housing 5, and the Oldham ring 15 prevents the movable scroll 2 from rotating to prevent the movable scroll from rotating. 2 is revolved around the fixed scroll 3. Reference numeral 16 is 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 suction pipe 13 is revolved by this revolution.
The low pressure gas sucked into the low pressure chamber 14 from is sucked into the compression chamber 17 formed by the scrolls 22 and 32 of the scrolls 2 and 3, and the sucked gas is compressed,
It is discharged from the discharge port 33 into the high pressure chamber 12, and is discharged from the external discharge pipe 11 to the outside of the casing 1.

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

Further, the thrust receiving portion 52 of the support housing 5 has an annular shape, and an annular oil groove 53 having a center O ₁ of the drive shaft 4 as a center is formed in a radial intermediate portion of the thrust receiving portion 52. In addition, the support housing 5 has one end that branches from the main oil supply passage 42 of the drive shaft 4 and communicates with a branch passage 43 that opens to the inner peripheral surface of the bearing 51, and the other end of the annular oil groove. An oil supply passage 54 that opens into 53 is formed, and oil is supplied from the main oil supply passage 42 to the annular oil groove 53 via the branch passage 43 and the oil supply passage 54 to lubricate the thrust receiving portion 52. There is.

Further, the end plate 21 of the movable scroll 2 is provided with an oil injection hole 7 penetrating in the thickness direction of the end plate 21, and the oil injection hole 7 is formed with respect to the central portion of the movable scroll 2. It comprises a symmetrical first oil injection hole 71 and a second oil injection hole 72. The outlet side of these oil injection holes 71, 72 of the compression chamber 17 formed between the spiral bodies 22, 32 is formed. It is provided so as to open near each of the two suction inlets.

Moreover, in the present embodiment, the oil injection hole 7
Since the drilling positions of 1, 72 are near the suction inlet of the compression chamber, the oil injection holes 71, 72 do not directly overlap the annular oil groove 53 when the movable scroll 2 revolves, and as a result, Since the oil injection holes 71, 72 cannot directly communicate with the annular oil groove 53, the inlet side of the oil injection holes 71, 72 is opened on the rear surface of the end plate 21 of the movable scroll 2, and the oil injection holes 71, 72 are opened. The counterbore portions 8, 8 are formed at a position larger than the diameter of No. 1 and capable of intermittently communicating with the annular oil groove 53 during the orbiting motion of the movable scroll 2.

Further, as shown in FIGS. 1 and 2, the back surface of the end plate 21 of the movable scroll 2 is communicated with the counterbore portions 8 and 8 and the inlet side opening area of the oil injection hole 7 is formed as described above. A recessed groove 9 is provided for enlarging the movable scroll 2 in the circumferential direction.

By enlarging the inlet side opening area of the oil injection holes 71, 72 by the counterbore portions 8, 8 and the concave groove 9, the oil injection holes 71, The communication area of the thrust receiving portion 52 of the thrust receiving portion 52 with the annular oil groove 53 is enlarged, and at the time of this communication, the oil of the annular oil groove 53 is introduced into the oil injection holes 71, 72, and the oil injection hole 71 , 72 to each suction inlet of the compression chamber 17 by injecting oil,
An oil seal is provided between 2 and 32 to prevent gas leakage.

The concave groove 9 will be specifically described.
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 the circle drawn at the groove width center position of the annular oil groove 53 is R ₁ , the center of the movable scroll 2. Is O ₂ , and the turning radius of the movable scroll 2 is Ror
Then, on the rear surface of the end plate 21 of the movable scroll 2, the concave groove 9 formed of the annular groove 91 whose center coincides with the center O ₂ of the movable scroll 2 is formed. The first and second oil injection holes 71, 72 are communicated with each other through the recessed groove 9 by communicating with the counterbore portions 8, 8.

Further, in the concave groove 9, the radius R ₂ of the annular groove 91, in this embodiment, the radius of the circle drawn by the groove width center of the annular groove 91, is the radius R _{1 of the} annular oil groove 53. Is set to a value obtained by adding the turning radius Ror of the movable scroll 2 to a circle larger than the annular oil groove 53.

In this way, the circular groove 91 is moved to the radius R ₁ of the annular oil groove 53 and the orbiting radius Ror of the movable scroll 2.
By drawing with a radius R ₂ added to the above, the annular groove 91 is moved to the annular oil groove 5 during the revolving movement of the movable scroll 2.
3 can always be communicated.

That is, referring to FIGS. 3 to 6, FIGS. 3 to 6 show the movable scroll 2 and the thrust receiving portion 52 in every 90 degrees of eccentric rotation of the eccentric shaft portion 41 of the drive shaft 4. This shows the positional relationship with the annular oil groove 53, and the center of the annular oil groove 53 is made to coincide with the center O ₂ of the drive shaft 4, so that the annular groove 91 is replaced with the radius R of the annular oil groove 53. By drawing the radius R ₂ by adding the orbiting radius Ror of the orbiting scroll 2 to ₁ as shown in the shaded portions in FIGS.
The annular groove 91 can always be communicated with the annular oil groove 53.

Therefore, as shown by the solid line in the graph of FIG. 8, the area for capturing the annular oil groove 53 in the opening area on the inlet side of the oil injection holes 71, 72, that is, the spot facing portions 8, 8 and the concave portion. Since the area of the overlapping portion of the groove 9 with the annular oil groove 53 can be made constant irrespective of the rotation angle of the drive shaft 4, the oil in the annular oil groove 53 is revolved by the revolution of the movable scroll 2. Is always taken into the groove 9,
The oil in the groove 9 can be constantly introduced into the oil injection holes 7.

As described above, on the rear surface of the end plate 21 of the movable scroll 2, not only the counterbore portions 8 but also the inlet side opening area of the oil injection hole 7 is further provided in the circumferential direction of the movable scroll 2. Since the groove 9 to be enlarged 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 side of the movable scroll 2, even if the position of the oil injection hole 7 relative to the annular oil groove 53 is displaced by the revolution of the movable scroll 2, the oil is passed through the groove 9. Since the communication area of the oil injection hole 7 to the annular oil groove 53 can be expanded in the circumferential direction, sufficient oil can be provided from the oil injection hole 7 to the compression chamber 17 formed between the scrolls 2 and 3. It is possible to inject.

Therefore, while the oil supply passage for injection can be simply machined and shortened 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 satisfactorily seal the inside of the compression chamber 17 with oil, reduce gas leakage in 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 which are symmetrical with respect to the central portion of the movable scroll 2, and the first and second oil injection holes 71, 72 are formed by the concave groove 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 and 72, so that both oil injection holes are simultaneously opened. 7
Oil can be injected into the compression chamber 17 from 1, 72, and a better oil seal can be achieved.

Moreover, since the concave groove 9 is formed by 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 groove 9 can be formed, the circumferential expansion area of the groove 9 can be maximized, so that more favorable oil injection can be performed.

[0055] Particularly, in the first embodiment, the ring radius R ₂ of the groove 91, the movable scroll 2 in the radial R ₁ of the annular oil groove 53
Since the orbiting radius Ror is added, even if the movable scroll 2 revolves, the annular groove 91 is always communicated with the annular oil groove 53, and the oil injection hole 7 always causes the compression chamber 17 to rotate. Oil injection is possible and stable oil supply is possible.

Further, in the first embodiment described above, the radius R ₂ of the annular groove 91 is set to a value obtained by adding the orbiting radius Ror of the movable scroll 2 to the radius R ₁ of the annular oil groove 53. The radius of the annular groove 91 may be a value obtained by subtracting the orbiting radius Ror of the movable scroll 2 from the radius R ₁ of the annular oil groove 53. In such a case as well, when the movable scroll 2 revolves,
Since the annular groove 91 can always be communicated with the annular oil groove 53, oil can be constantly injected from the oil injection hole 7 into the compression chamber 17, and stable oil supply can be performed.

In the first embodiment, the annular groove 9
Although the first and second oil injection holes 71 and 72 are communicated with each other at 1, the two annular grooves having different radii described above are formed, and one of the oil injection holes has a large diameter through the spot facing portion. The other oil injection hole may be communicated with the annular groove through the counterbore to the annular groove having a small diameter.

Next, the second embodiment will be described with reference to FIG. In the second embodiment, the concave groove 9 is a partial arc groove 92 whose both ends in the lengthwise direction are closed, and the end plate 21 of the movable scroll 2 is provided in the same manner as in the first embodiment.
A first symmetric structure 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 two partial arc grooves 92, 92 are formed so as to communicate with the first and second oil injection holes 71, 72 respectively. There is.

[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 is formed.
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 always communicating along the arc from the time when the partial arc groove 92 communicates at one end in the circumferential direction. I am trying.

The length of the arc is the same as that of the compression chamber 1
The length of the annular oil groove 53 is set to a desired value depending on the amount of oil introduced into the annular oil groove 53.
The amount of oil introduced from is adjusted.

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

Further, the partial circular arc groove 92 is formed with a radius R ₂ centered on the center O ₂ of the movable scroll 2 and a value obtained by adding the orbiting radius Ror of the movable scroll to the radius R ₁ of the annular oil groove 53. Therefore, during the revolution of the movable scroll 2, the communication between the partial circular arc groove 92 and the annular oil groove 53 is always communicated along the circular arc from when the partial circular arc groove 92 is communicated at one end in the circumferential direction. However, it is possible to reach the other end, and the oil injection amount can be adjusted even better.

In the second embodiment, the partial arc groove 92 is formed.
Around the center O ₂ of the orbiting scroll ₂ to the radius R ₁ of the annular oil groove 53 and the orbiting radius Ror of the orbiting scroll.
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 Even in this case, during the revolution of the movable scroll 2, the partial arc groove 92 and the annular oil groove 53 are communicated with each other at an end portion of one circumferential direction of the partial arc groove 92 from the circular arc. It is possible to reach the other end while always communicating along with, and it is possible to favorably adjust the oil injection amount.

In the above embodiment, the movable scroll 2 is used.
In the above description, the two oil injection holes 71 and 72 are formed, but it is also possible to apply one oil injection hole or a plurality of oil injection holes.

[0065]

According to the first aspect of the present invention, on the rear surface of the end plate 21 of the movable scroll 2, the groove 9 for enlarging the inlet side opening area of the oil injection hole 7 in the circumferential direction of the movable scroll 2 is provided. Therefore, 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 orbital motion of the movable scroll 2, the oil is injected through the concave groove 9. Since the communication area of the oil injection hole 7 to the annular oil groove 53 can be enlarged, sufficient oil can be injected from the oil injection hole 7 into the compression chamber formed between the scrolls 2 and 3.

Therefore, while the oil supply passage for injection can be simply processed and shortened to simplify the construction, a sufficient amount of oil injection from the oil injection hole 7 to the compression chamber can be performed, It is possible to satisfactorily seal the inside of the compression chamber with oil, reduce gas leakage in the compression stroke, and improve the efficiency of the compressor.

According to the second aspect of the invention, the oil injection hole 7 is composed of a first oil injection hole 71 and a 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, 72 are communicated with each other by the groove 9, the oil introduced into the groove 9 from the annular oil groove 53 is used as the first and second oil injection holes. 71, 72
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 achieved.

According to the invention of claim 3, the concave groove 9 is formed.
Is an annular groove 9 centered on the center of the movable scroll 2.
Since the groove 9 is formed from 1, the groove 9 can be formed more easily, and the expansion area of the groove 9 in the circumferential direction of the movable scroll 2 can be maximized, so that better oil injection can be performed.

According to the invention described in claim 4, in the invention described in claim 3, the radius of the annular groove 91 is set to a value obtained by adding the orbiting radius of the movable scroll 2 to the radius of the annular oil groove 53. Even if the movable scroll 2 revolves, the annular groove 91 is always communicated with the annular oil groove 53, and oil injection from the oil injection hole 7 to the compression chamber can always be performed, so that stable oil supply can be performed. .

According to the invention of claim 5, in the invention of claim 3, the radius of the annular groove 91 is set to a value obtained by subtracting the orbiting radius of the movable scroll 2 from the radius of the annular oil groove 53. Therefore, even if the movable scroll 2 revolves, the annular groove 91 can always be communicated with the annular oil groove 53, so that oil injection can always be performed from the oil injection hole 7 into the compression chamber, and stable oil supply can be performed. Of.

According to the invention described in claim 6, the concave groove 9 is formed.
Is a partial arc groove 92 whose both ends in the length direction are closed. Therefore, it is possible to adjust the oil injection amount by setting the communication area of the oil injection hole 7 to the annular oil groove 53 to a desired width. Becomes

According to the invention described in claim 7, in the invention described in claim 6, the partial arc groove 92 is such that the orbiting radius of the movable scroll is set to the radius of the annular oil groove 53 with the center of the movable scroll 2 as the center. Since the radius is the added value, the partial arc groove 9 is formed during the revolution of the movable scroll 2.
2 and the annular oil groove 53 are connected to each other by the partial arc groove 92.
From the time of communicating at one end in the circumferential direction to the other end while always communicating along the arc, the oil injection amount can be adjusted even better.

According to the invention described in claim 8, in the invention described in claim 6, the partial circular arc groove 92 has the orbiting radius of the movable scroll in the radius of the annular oil groove 53 with the center of the movable scroll 2 as the center. Since it is formed with the radius of the reduced value, the partial arc groove 9 is formed during the revolution of the movable scroll 2.
2 and the annular oil groove 53 are connected to each other by the partial arc groove 92.
From the time of communicating at one end in the circumferential direction to the other end while always communicating along the arc, the oil injection amount can be adjusted even better.

[Brief description of drawings]

FIG. 1 is a partial vertical 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 the annular oil groove and the concave groove in the first embodiment.

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

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

FIG. 6 is an explanatory view showing a communication state between the annular oil groove and the 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 an annular oil groove trapping area in an inlet side opening area of an oil injection hole corresponding to a rotation angle of a 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 fluid machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Movable scroll 21 End plate 52 Thrust receiving part 53 Annular oil groove 7 Oil injection hole 71 First oil injection hole 72 Second oil injection hole 9 Recessed groove 91 Circular groove 92 Partial arc groove

Claims (8)

[Claims] 1. A thrust receiving portion (52) for receiving the rear surface of the end plate (21) of a movable scroll (2) is provided with an annular oil groove (53) for introducing oil to be pumped from an oil reservoir of a casing (1) which is a low-pressure dome. A scroll type in which the end plate (21) of the movable scroll (2) is provided with an oil injection hole (7) penetrating in the thickness direction of the end plate (21) and capable of communicating with the annular oil groove (53). In the fluid machine, an opening area on the inlet side 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 in that it is provided with a groove (9) that expands in the circumferential direction. 2. An oil injection hole (7) has a movable scroll (2).
The first oil injection hole (71) and the second oil injection hole (72) that are symmetrical with respect to the center of the first and second oil injection holes (71) (72). 3. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machines are communicated with each other. 3. A scroll type fluid machine according to claim 1, wherein the concave groove (9) comprises an annular groove (91) centered on the center of the movable scroll (2). 4. The radius of the annular groove (91) is set to the annular oil groove (5).
4. The scroll type fluid machine according to claim 3, wherein the radius is 3) and the orbiting radius of the movable scroll is added. 5. The radius of the annular groove (91) is set to the annular oil groove (5
4. The scroll fluid machine according to claim 3, wherein the radius of 3) is set to a value obtained by subtracting the orbiting radius of the movable scroll. 6. The scroll type fluid machine according to claim 1 or 2, wherein the concave groove (9) comprises a partial circular arc groove (92) having both longitudinal ends closed. 7. A partial arc groove (92) is formed with a radius of a value obtained by adding the orbiting radius of the orbiting scroll (2) to the radius of the annular oil groove (53) with the center of the orbiting scroll (2) as the center. The scroll type fluid machine according to claim 6. 8. A partial arc groove (92) is formed with a radius of a value obtained by subtracting the orbiting radius of the movable scroll (2) from the radius of the annular oil groove (53) with the center of the movable scroll (2) as the center. The scroll type fluid machine according to claim 6.