JPH0745874B2 - Scroll fluid machinery - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll fluid machine of a full system rotation type that rotates a drive scroll and a driven scroll.

[Conventional technology]

In general, as a scroll fluid machine, a scroll compressor, which is a kind of positive displacement compressor that performs a compression action by combining a pair of spiral projections, is widely known.

Generally, the operating principle of this type of scroll compressor is to fix one spiral protrusion and to make the other spiral protrusion swing to perform a compression action. US Pat. No. 3,884,599 and U.S. Pat. No. 2475247.

A scroll compressor of this type, in which both spiral projections are rotated around their respective centers, a so-called full system rotary type compressor is also known in the above-mentioned US patent.

Next, the principle of operation of this full-system rotary scroll compressor will be described. For example, as shown in FIG. 3, the shaft center O ₁ is driven by a drive source such as an electric motor, an engine, or a turbine.
The driving scroll 1 makes a rotational movement around the center, and the driven scroll 2 also makes a rotational movement around its axial center O ₂ in synchronization with this rotation. Therefore, the rotation of the scrolls 1 and 2 causes the compression chamber 3 between the spiral projections 1a and 2a to move toward the center so that the volume of the compression chamber 3 is reduced and the pressure of the compressed gas rises. Is exhaled as high-pressure gas from. Here, in the state of 0 ° in FIG. 7A, gas is sucked into the compression chamber 3, and FIG.
Thereafter, the compression chamber 3 is gradually moved to the center side by the rotation of 0 ° → 90 ° → 180 ° → 270 ° → 360 ° (0 °), as shown in (d), and the volume is reduced. In the meantime, it can be seen that the radial seal portions S formed by the spiral protrusions 1a and 2a of both scrolls 1 and 2 are arranged in a straight line in the radial direction and occupy a fixed position in a stationary state.

[Problems to be solved by the invention]

By the way, in this type of scroll fluid machine, it is extremely difficult to set and maintain a high vacuum degree on the suction side with respect to the discharge side of the fluid, and therefore, the principle of the scroll compressor can be applied to the scroll vacuum pump as it is. The advent of a scroll fluid machine capable of doing so has been desired.

The present invention has been made to meet such a demand,
(EN) A scroll fluid machine capable of setting and maintaining a fluid suction chamber at a high degree of vacuum with respect to a discharge side and thus applying the principle of a scroll compressor to a scroll vacuum pump.

[Means for solving problems]

A scroll fluid machine according to the present invention has a suction chamber in which oil is stored and which is communicated with a vacuumed container.
And a second container which is airtightly attached to the first container and has an atmospheric pressure chamber in which oil is stored, and an inhalation chamber provided between the first container and the second container. And a bearing support that separates the pressure chamber from the atmospheric pressure chamber, and a bearing on the bearing support,
A drive shaft having an exhaust passage which is supported through the oil seal and communicates with the atmospheric pressure chamber, and a drive shaft integrally provided at the insertion end of the drive shaft and housed in the first container and inside the exhaust passage. The first scroll that communicates with the center and this first scroll
Second scroll that is eccentrically combined with the scroll and is rotatably supported by the first container to form a compression chamber in cooperation with the first scroll, and a compression that opens and closes the compression chamber side of the exhaust passage. A check valve for fluid passage, a first oil supply passage provided on the drive shaft and communicating with the compression chamber, a second oil supply passage provided on the bearing support and communicating with the first oil passage, and And a valve that opens and closes the opening of the oil supply passage on the atmospheric pressure chamber side to the atmospheric pressure chamber when the scroll rotates and closes when the scroll stops.

[Action]

According to the present invention, the reverse flow of the fluid discharged from the compression chamber to the atmospheric pressure chamber through the discharge chamber and the exhaust passage can be blocked by the check valve for passing the compressed fluid, and the atmospheric pressure chamber side of the oil supply passage can be prevented. By opening the valve that opens and closes the opening during operation, the oil that passes through the oil supply passage can be supplied into the compression chamber.

〔Example〕

FIG. 1 is a sectional view showing the whole scroll fluid machine according to the present invention, and FIG. 2 is a bottom view showing the main part of the scroll fluid machine. In the figure, reference numeral 11 is a cylindrical first container having an intake chamber 12 in which oil (not shown) is stored, and a flange 1 for mounting is provided at both open ends.
3,14 are integrally provided, and both flanges 13,14
Upper bearing support 15 and lower bearing support 16 are O-rings 17, 18
Is fixed through. Further, a suction pipe 19 that opens to the side is attached between both flanges 13 and 14 of the container 11. Reference numeral 20 denotes a cylindrical second container having an atmospheric pressure chamber 21 in which the oil (not shown) is stored, which is integrally provided on the upper bearing support 15 and is attached to one end of the opening. The flange 23 for is integrally provided. In addition, a discharge pipe 24 that opens to the side is attached to the second container 20. The atmospheric pressure chamber 21 and the suction chamber 12 are separated by the upper bearing support 15. 26 is its output shaft
Part of 26a is a motor that faces the atmospheric pressure chamber 21, and bolt 2
The motor flange 28 is fixed to the flange 23 of the second container 20 by 7. Reference numeral 29 denotes a drive scroll as a first scroll, which has a circular end plate 29a and a spiral protrusion 29b, and is rotatably accommodated in the first container 11. On the back side of the end plate 29a of the drive scroll 29, notched grooves (not shown) are formed at two positions spaced 180 ° apart from each other in the circumferential direction. Keys (not shown), some of which are exposed outside the groove, are fixed by bolts (not shown). A drive shaft 36 having an exhaust passage 36a extending in the axial direction and a plurality of discharge holes 36b opening in the radial direction is integrally provided at the center position of the end plate 29a of the drive scroll 29. The drive shaft 36 has a first oil supply passage 37 communicating with a compression chamber, which will be described later, and is rotatably supported by penetrating the upper bearing support 15 through bearings 38, 39 and oil seals 40, 41. And, it is connected to the output shaft 26a by a shaft joint 42. In addition, the drive shaft 36 and the drive scroll 29 have a discharge chamber 43 communicating with the exhaust passage 36a.
Is provided. Reference numeral 44 is a second oil supply passage communicating with the first oil supply passage 37 and the large atmospheric pressure chamber 21, and is provided in the upper bearing support 15. Reference numeral 45 is a valve that opens and closes the atmospheric pressure chamber side opening of the second oil supply passage 44, and is attached to the upper bearing support 15. Reference numeral 46 denotes a valve opening / closing spring, both ends of which are attached to the valve 45 and the drive shaft 36, and are configured to open the valve 45 by centrifugal force during pump operation. Reference numeral 47 is an annular space portion communicating with both the oil supply passages 37 and 44, and is formed between the bearing 39 and the oil seal 41. 48 is a check valve for passing compressed fluid,
It is provided inside the discharge chamber 43 so as to be openable and closable. Reference numeral 49 denotes a driven scroll as a second scroll, which has a circular end plate 49a and a spiral protrusion 49b, and has the first container.
11 is rotatably accommodated in the drive scroll 29.
And is configured to compress the fluid in the compression chamber 50 in cooperation with the drive scroll 29. 51 is the axis O ₁ of the drive scroll 29, that is, the drive axis
A boss having an axis O ₂ that is eccentric with respect to 36, is integrally provided at the center position of the end plate 49a of the driven scroll 49, and is provided to the lower bearing support 16 and the bearing support 16 via the bearings 52 and 53. It is rotatably supported. 54 is a joint for transmitting a rotational force, and includes a base 55 formed by an annular pair and the base 55.
It is composed of four sets of ribs 56 provided at positions spaced by 90 ° in the circumferential direction, and is arranged on the axially outer end face side of the drive scroll 29 of the scrolls 29, 49, that is, on the rear face side of the end plate 29a. And is engaged with the drive scroll 29 at two positions in the circumferential direction by the key. A guide groove 59 into which one end of a connecting arm and a key (not shown) described later are slidably fitted between the ribs 56 of each set of the joint 54.
A and 56b (only one is shown) are formed. 57 and 58
Is a connecting arm having a U-shaped cross section, one end of which is fixed to the end plate 49a of the driven scroll 49 of the scrolls by bolts 59 and 60, and the other end of which is located at two positions in the circumferential direction of the joint 54. It is laid up. The engagement positions of the two connecting arms 57, 58 and the engagement position of the joint 54 are positioned on lines orthogonal to each other. Further, 61 is a locking plate for locking the bearing 38 of the both bearings 38, 39 in the upper bearing support 15, 62
Is a screw for fixing the locking plate 61 to the upper bearing support 15,
Reference numeral 65 is a retaining ring that supports the lower oil seal 41 of the oil seals 40 and 41 in the upper bearing support 15, and 66 is a spring that biases the check valve 48 in the closing direction. A vacuumed container (not shown) is connected to the open end of the suction pipe 19 on the external exposure side.

In the scroll fluid machine configured as described above,
The drive shaft 36 is provided with a first oil supply passage 37 communicating with the compression chamber 21,
The second oil supply passage 44 communicating with the oil supply passage 37 and the atmospheric pressure chamber 21.
Is provided on the upper bearing support 15, and a valve 45 that is opened and closed so that the atmospheric pressure chamber side opening of the oil supply passage 44 is opened by centrifugal force during pump operation is attached, and between the bearing 39 and the oil seal 41. Since the annular space 47 is formed, the oil (not shown) stored in the atmospheric pressure chamber 21 is constantly supplied into the compression chamber 50 due to the pressure difference between the suction side and the discharge side when the valve 45 is opened. can do. At this time, the bearing 39 and the oil seal 41 can be lubricated by the oil near the space 47.

Next, the operation of the scroll fluid machine according to the present invention will be described. The rotation of the motor 26 drives the scroll.
When 29 rotates around the axis O ₁ , the driven scroll
49 rotates synchronously around the axis center O ₂ . At this time, the joint 54 and the connecting arms 57 and 58 on the drive scroll 29 cause the respective scrolls 29 and 49 to rotate at positions accurately twisted by 180 °. Further, the protrusions 29b and 49b are partially contacted with each other to completely seal the compression chamber 50, thereby increasing the degree of vacuum. Then, when the fluid in the vacuumed container (not shown) is sucked from the suction pipe 19 by the rotation of both scrolls 29, 49, the fluid is compressed in the compression chamber 50, the check valve 48 is opened, and the exhaust passage is opened. 36a, Atmospheric pressure chamber 21 is discharged into the atmosphere from discharge pipe 24. In this case, the reverse flow of the fluid discharged into the atmospheric pressure chamber 21 is a check valve.
Being blocked by 48.

〔The invention's effect〕

As described above, according to the scroll fluid machine of the present invention, the first container which has the suction chamber for storing the oil and communicates with the inside of the container to be evacuated, and the first container is hermetically attached to the first container. The second having an atmospheric pressure chamber in which oil is stored
And a bearing support that separates the suction chamber and the atmospheric pressure chamber between the first and second containers, and the bearing support is pierced through the bearing support and the oil seal to communicate with the atmospheric pressure chamber. A drive shaft having an exhaust passage, a first scroll integrally provided at an insertion end of the drive shaft, housed in a first container, and having an internal center communicating with the exhaust passage, and eccentric to the first scroll. A second scroll that is combined and rotatably supported by the first container to cooperate with the first scroll to form a compression chamber, and a reverse for passage of compressed fluid that opens and closes the compression chamber side of the exhaust passage. A stop valve, a first oil supply passage provided on the drive shaft and communicating with a compression chamber, a second oil supply passage provided on the bearing support in communication with the first oil supply passage, and an atmospheric pressure chamber of the second oil supply passage. The side opening is opened to the atmospheric pressure chamber during scroll rotation and Since it has a valve that opens and closes when the roll is stopped, a check valve that opens and closes the reverse flow of fluid discharged from the compression chamber to the atmospheric pressure chamber through the discharge chamber and exhaust path on the compression chamber side of the exhaust path. Can be prevented by. Further, according to the present invention, the oil can be supplied into the compression chamber by the valve that opens the oil supply passage during the operation in which the scroll is rotating, so that the airtightness can be improved. Therefore, according to the present invention, the suction side with respect to the fluid discharge side can be set and maintained at a high degree of vacuum, and the principle of the scroll compressor can be directly applied to the scroll vacuum pump.

Further, according to the present invention, the drive shaft is provided with the first oil supply passage communicating with the compression chamber, the second oil supply passage communicating with the first oil supply passage is provided on the bearing support, and the second oil supply passage is provided. Since a valve that opens the atmospheric pressure chamber side opening during operation and closes when stopped is installed, oil that can be stored in the atmospheric pressure chamber at all times due to the pressure difference between the suction side and the discharge side when opening this valve is always in the compression chamber. It can be supplied and the sealing property in the compression chamber can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire scroll fluid machine according to the present invention, FIG. 2 is a bottom view showing the same part of the scroll fluid machine, and FIGS. 3 (a) to 3 (d) are conventional whole system rotations. It is a figure explaining the operating principle of a scroll fluid machine of a shape. 11 ... First container, 12 ... Inhalation chamber, 20 ... Second container, 21 ...
… Atmospheric chamber, 29 …… Drive scroll, 36 …… Drive shaft, 36
a ... Exhaust passage, 37 ... First oil supply passage, 39 ... Bearing, 41 ...
… Oil seal, 44 …… Second oil supply passage, 45 …… Valve, 47…
… Space, 48 …… Check valve, 49 …… Following scroll.

Front page continuation (72) Inventor Sumio Sumoto 1-1-1, Imajuku Higashi, Nishi-ku, Fukuoka-shi, Fukuoka Within Fukubishi SEMICON Engineering Co., Ltd. (56) Reference JP-A-62-228689 (JP, A)

Claims (2)

[Claims] 1. A first container (11), which has a suction chamber (12) for storing oil therein and is communicated with a vacuumed container,
A second container (20) airtightly attached to the first container (11) and having an atmospheric pressure chamber (21) in which the oil is stored, the first container (11) and the second container (20). A bearing support (15) which is provided between the container (20) and separates the suction chamber (12) and the atmospheric pressure chamber (21), and the bearing support (15) has bearings (38, 39) and A drive shaft (36) having an exhaust passage (36a) penetratingly supported via an oil seal (40, 41) and communicating with the atmospheric pressure chamber (21), and an insertion end of the drive shaft (36). And a first scroll (29) that is integrally provided in the first container (11) and is housed in the first container (11) and has an internal center communicating with the exhaust passage (36a), and the first scroll (29).
A second scroll (49) which is eccentrically combined with and is rotatably supported by the first container (11) and cooperates with the first scroll (29) to form a compression chamber (50); A check valve (48) for passing a compressed fluid, which opens and closes the compression chamber (50) side of the exhaust passage (36a), and a first valve provided on the drive shaft (36) and communicating with the compression chamber (50). A fuel line (37),
The first oil supply passage (37) provided on the bearing support (15)
The second oil supply passage (44) communicating with the second oil supply passage (44) and the opening of the second oil supply passage (44) on the atmospheric pressure chamber side.
And a valve (45) which is opened and closed to the atmospheric pressure chamber (21) during rotation and is closed and closed when the scroll (29, 49) is stopped. 2. An annular space portion (47) communicating between the first oil supply passage (37) and the second oil supply passage (44) is provided between the bearing (39) and the oil seal (41). The scroll fluid machine according to claim 1, wherein the scroll fluid machine is formed.