JPH04365982A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To maintain good confidentiality in a fluid operation chamber by preventing excessive oil delivery into the operation chamber without using a capillary tube, and by properly controlling the amount of oil delivery. CONSTITUTION:An annular oil delivery port 6 is opened on a contact surface by placing an annular sealing member 5 on the back surface of a mirror plate 31 of a moving scroll 3, and an oil pool 81 for accumulating high pressure oil to be pumped up to an oil supply hole 91 is provided on the bottom of a storage chamber 80 of a crank pin part 90 in an engine frame 8. The oil pool 81 and the oil delivery port 6 are communicated with each other by an oil passage 51, while an oil communication route 7 intermittently communicated to the delivery port 6 following the revolving work, is formed on the moving scroll 3, and the exit part of oil is communicated to a fluid operation chamber 4 which is in an intermediate pressure region in the middle of compression, and by limiting a period of oil delivery, excessive oil delivery is inhibited, and proper amount of oil is controlled by adjustment of position of the oil communication route 7.

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 in which oil is injected into a fluid working chamber for compressing refrigerant, etc., and the inside of the fluid working chamber is sealed.

0002

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication No. 3-88988, and as shown in FIG. A discharge hole is provided in the center of the spiral to compress the low-pressure gas taken into the outer periphery of the spiral via the suction pipe L in the fluid working chamber C defined between the spiral bodies a and b, and to release the compressed high-pressure gas to the center of the spiral. It opens from H into the sealed casing D. In order to seal and maintain the airtightness of the fluid working chamber C, where the pressure changes from a low pressure region on the outer circumferential side of the spiral to a high pressure region on the spiral center side, a high pressure An oil injection pipe J extending from the bottom oil reservoir of the sealed casing D in the atmosphere is connected, and oil is injected by differential pressure to form an oil film necessary for sealing on the sliding contact surface between each spiral body a and b. I'm trying to make it possible.

0003

However, in the above system, the high-pressure oil reservoir and the working chamber C are constantly communicated through the oil injection pipe J, and oil is constantly injected into the working chamber C. The amount of oil injected tends to be excessive, and to avoid this, it is necessary to configure the oil injection pipe J with a small-diameter capillary tube to limit the flow rate, which increases costs and makes selection of the tube diameter complicated. However, there is a problem in that it is difficult to control the desired amount of oil.

The main object of the present invention is to provide a scroll-type fluid machine that can appropriately inject oil into a fluid working chamber without using a capillary tube by devising a method for injecting oil into a fluid working chamber.

[0005]

[Means for Solving the Problem] Therefore, in order to achieve the above-mentioned main purpose, firstly, a fixed scroll 2 having a spiral body and a movable scroll 3 are installed inside a high-pressure dome-shaped sealed casing 1, and these Between the spiral bodies of scrolls 2 and 3,
In a scroll-type fluid machine that defines a fluid working chamber 4 whose pressure changes from a low pressure region on the outer circumferential side of the spiral to a high pressure region on the spiral center side, the mirror plate 31 is placed on the back side of the end plate 31 of the movable scroll 3, and the end plate 31 is placed on the center side. An annular seal member 5 that is partitioned into an outer peripheral side and an annular seal member 5 is interposed, and an oil inlet 6 extending from an oil region communicating with the inside of the casing 1 is opened in the contact surface of the seal member 5 to the end plate 31. At the same time, the movable scroll 3 is attached to the end plate 31 of the movable scroll 3.
An oil communication passage 7 is formed that communicates intermittently with the oil inlet 6 as the oil inlet 6 revolves, and an outlet portion of the oil communication passage 7 is communicated with the working chamber 4.

Secondly, in order to prevent suction heating due to oil injection, in the first method described above, the outlet of the oil communication passage 7 is opened into the fluid working chamber 4 in the intermediate pressure region.

Third, the seal member 5 and the movable scroll 3
In the first or second means described above, the oil inlet 6 has a structure consisting of a ring groove surrounding the center of the end plate 31 of the movable scroll 3.

Fourthly, in order to further simplify the passage structure for oil injection, the first means includes a frame 8 having a housing chamber 80 for a crank pin portion 90 that drives the movable scroll 3; An oil pool 81 is provided at the bottom of the storage chamber 80 to release the oil pumped up to the crankshaft 9, and an oil passage 51 formed in the seal member 5 is provided between the oil pool 81 and the oil inlet 6. communicated.

Fifthly, in order to reduce power loss due to interference between the oil stored in the oil pool 81 and the crank pin portion 90, in the fourth means, the bottom of the storage chamber 80 is connected to the rotation of the crank pin portion 90. An oil drain hole 82 is provided below the region, and an oil drain hole 82 is opened in the storage chamber 80 to drain oil accumulated in the rotation region of the crank pin portion 90.

Sixthly, in order to improve the oil transfer between the oil inlet 6 and the oil communication passage 7, in the first means, a biasing means 53 is provided on the back of the seal member 5. equipped.

Seventhly, in order to particularly improve sealing and lubrication in the thrust direction between the movable scroll 3 and the fixed scroll 2, in the first means, the outlet portion of the oil communication passage 7 is connected to the movable scroll 3. An opening was formed at the tip of the spiral.

0012

[Operation] By the first means, high-pressure oil is guided to the oil inlet 6 and communicated with the inside of the sealed casing 1, and as the movable scroll 3 revolves, the oil inlet 6 and the oil communication passage 7 are brought into communication. When this happens, the fluid is injected into the fluid working chamber 4 . At this time, the oil inlet 6 and the oil communication passage 7 communicate with each other only for an intermittent short period of time, rather than during the entire period during one revolution of the movable scroll 3. The amount of oil injected into the fluid working chamber 4 is limited, and the period during which the oil communication passage 7 communicates with the oil inlet 6 can be easily set by the opening position of the oil communication passage 7. Therefore, the amount of oil to be injected can be easily set.

By the second means, oil is injected into the working chamber 4 in the intermediate pressure region, so that the low pressure gas taken into the inlet of the fluid working chamber 4 is prevented from being excessively heated by this injected oil. It is possible to suppress the decrease in volumetric efficiency.

According to the third means, the sliding characteristics between the sealing member 5 and the back surface of the end plate 31 of the movable scroll 3 can be improved by the oil accumulated in the oil inlet 6 consisting of a ring groove.

[0015] By the fourth means, the bottom of the storage chamber 80 in the frame 8 can be effectively used, and the passage configuration for oil injection can be simplified.

By the fifth means, interference between the oil stored in the oil pool 81 and the crank pin portion 90 can be avoided, and
Excess oil can be discharged to the bottom oil reservoir of the sealed casing 1 through the oil drain hole 82, and power loss due to oil agitation can be reduced.

By the sixth means, the sealing member 5 and the end plate 31 of the movable scroll 3 can be brought into close contact with each other, and the oil can be transferred between the oil inlet 6 and the oil communication passage 7. Can be done.

By the seventh means, the oil that has been supplied to the tip of the spiral of the movable scroll 3 is injected into the fluid working chamber 4, and the oil that has been supplied to the tip of the scroll of the movable scroll 3 is injected into the tip of the spiral of the movable scroll 3 and the fixed scroll 2.
Good sealing and lubrication in the thrust direction between the two can be achieved.

[0019]

[Embodiment] The scroll-type fluid machine shown in FIG. 1 includes a high-pressure dome-shaped sealed casing 1, a fixed scroll 2 having a spiral body 22 and an outer circumferential wall 23 extending from an end plate 21, and an end plate 31. A movable scroll 3 with a protruding spiral body 32 is installed inside via a frame 8, and a crankshaft 9 extending from a motor 13 having a stator 11 and a rotor 12 is attached to a boss tube 33 protruding from the lower surface of the movable scroll 3. While the crank pin part 90 is fitted, an Oldham ring 18 is interposed between the movable scroll 3 and the frame 8 to prevent the movable scroll 3 from rotating, and the movable scroll 3 is driven by the motor 13 to revolve, and the suction The low-pressure gas taken in from the pipe 24 to the suction port 25 on the outer periphery of the spiral is compressed within the fluid working chamber 4 defined between the spiral bodies, and the compressed high-pressure gas is discharged through the discharge hole 26 provided in the center of the spiral of the fixed scroll 2. It opens into the inside of the casing 1 and is taken out from the discharge pipe 19.

With the above configuration, the end plate 3 of the movable scroll 3
1, an annular cylindrical seal member 5 that divides the end plate 31 into a center side and an outer peripheral side is interposed, and this seal member 5
An oil inlet 6 consisting of a ring groove surrounding the center of the end plate 31 is opened on the contact surface with the end plate 31, and an oil pool 81 is provided at the bottom of the housing chamber 80 of the crank pin portion 90 in the frame 8. So, in this oil pool 81,
Oil that is pumped up from the bottom oil reservoir to the oil supply hole 91 in the crankshaft 9 via a positive displacement oil pump installed at the lower end of the crankshaft 9 and flows out through the upper shaft end and the pin notch groove 92, and the main bearing. Alternatively, the oil flowing out after the pin bearing 94 is oiled is collected, and the oil passage 51 formed in the axial direction of the seal member 5 is connected between this oil pool 81 and the oil inlet 6. to communicate.

Further, an oil communication passage 7 consisting of a straight through hole is formed in the end plate 31 of the movable scroll 3 to intermittently communicate with the oil inlet 6 as the movable scroll 3 revolves. The outlet of the communication passage 7 is communicated with the fluid working chamber 4 which is in an intermediate pressure region in the middle of compression.

[0022] An annular groove is provided in the outer peripheral part of the seal member 5, and an O-ring 52 is interposed therein. The space between the low-pressure back chamber 15 communicated with the suction port 25 via the through hole 34 and the storage chamber 80 can be sealed in the axial direction.

Furthermore, an annular spring receiving portion is provided on the back of the sealing member 5, and the urging means 5 consisting of a spring 53a is provided.
3 is interposed so that the contact surface of the upper end of the seal member 5 can be brought into close contact with the end plate 31 of the movable scroll 3.

Furthermore, the bottom of the storage chamber 80 is provided below the rotating region of the crank pin portion 90, and the oil pool 81 is recessed at a lower position outside the main bearing 93 where it does not interfere with the crank pin portion 90. An annular recess 83 is provided in the concave groove in which the housing chamber 80 is inserted, and an annular recess 83 is provided below the inner periphery of the frame 8 that defines the accommodation chamber 80 .
An oil drain hole 82 is provided which opens into the inside of the crank pin portion 90 and drains oil accumulated in the rotating region of the crank pin portion 90 to the bottom oil reservoir through the internal space of the sealed casing 1. In this manner, during operation, high-pressure oil stored in the oil pool 81 and communicating with the inside of the sealed casing 1 via the oil supply hole 91 and the oil drain hole 82 is transferred to the oil passage 51.
The oil rises and is introduced into the oil inlet 6, and when the oil inlet 6 and the oil communication passage 7 communicate with each other as the movable scroll 3 revolves, it is injected into the fluid working chamber 4. In this case, the oil inlet 6 and the oil communication passage 7 communicate with each other not during the entire period during one revolution of the movable scroll 3;
Since it is only for an intermittent short period of time, the amount of oil injected into the fluid working chamber 4 via the oil communication passage 7 is limited, and therefore, excessive lubrication can be prevented. Since the period during which the oil communication passage 7 communicates with the oil inlet 6 can be easily set by the opening position of the oil communication passage 7,
The amount of oil injected into the working chamber 4 can be easily and appropriately managed.

Furthermore, since the oil from the oil communication passage 7 is injected into the working chamber 4 which is in the intermediate pressure region, it is possible to prevent the injected oil from excessively heating the low pressure gas released to the suction port 25. , it is possible to suppress a decrease in volumetric efficiency, and the working chamber 4
Since oil is injected directly into the engine, it is possible to quickly ensure sealing performance even at the beginning of startup.

Furthermore, since the oil inlet 6 is constructed with an annular ring groove, the sealing member 5 and the end plate 3 of the movable scroll 3
This makes it possible to improve the sliding characteristics between the material and the back surface of the material.

Furthermore, an oil pool 81 is provided using the bottom of the storage chamber 80 in the frame 8, and the oil accumulated in this oil pool 81 is injected into the working chamber 4 side through the oil passage 51 provided in the seal member 5. This makes it possible to simplify the structure for oil injection.

Moreover, the bottom of the storage chamber 80 is lowered to prevent interference between the oil stored in the oil pool 81 and the crank pin part 90, and excess oil is drained into the sealed casing 1 through the oil drain hole 82.
Since the oil is discharged into the bottom oil sump, it is also possible to reduce power loss due to oil agitation.

Furthermore, a biasing means 53 is applied to the back surface of the sealing member 5.
Since the sealing member 5 and the end plate 31 of the movable scroll 3 can be brought into close contact with each other, the oil can be transferred well between the oil inlet 6 and the oil communication passage 7. In addition, together with the interposition of the O-ring 52, the high-pressure storage chamber 80 and the low-pressure rear chamber 15 are
It is possible to maintain an appropriate area of action for the high pressure applied to the back surface of the movable scroll 3, and to maintain an appropriate upward thrust force of the movable scroll 3 toward the fixed scroll 2 side. It can be retained.

Note that the biasing means 53 includes a spring 53a.
In addition to using an O-ring 53b, as shown in FIG. In this case, the O-ring 53b constituting the biasing means 53 also serves to seal between the storage chamber 80 and the back chamber 15, and the axial O-ring 52 shown in FIG. 1 can be omitted. Further, in this case, since the bottom of the oil pool 81 is divided into an inner circumferential side and an outer circumferential side by the O-ring 53b constituting the biasing means 53, the oil drain hole 82 is formed in the first hole provided in the seal member 5. Oil drain hole 82a and second oil drain hole 82 provided in frame 8
b, to communicate between the storage chamber 80 and the inside of the casing 1.

Further, the oil communication passage 7 has its outlet directly opened into the fluid working chamber 4 through the flat plate portion of the end plate 31 of the movable scroll 3, and as shown in FIG.
The outlet portion may be opened in the fitting groove 36 of the tip seal 35 interposed at the tip of the spiral body 32 of the movable scroll 3, and in this case, the oil after being supplied to the tip seal 35 part becomes a fluid. It is injected into the working chamber 4 and can provide a good seal in the thrust direction between the end face of the spiral body 32 of the movable scroll 3 and the end plate 21 of the fixed scroll 2.

Furthermore, in each of the above embodiments, the back chamber 15 at the outer periphery of the spiral of the movable scroll 3 is communicated with the suction port 25 to maintain a low pressure, and the oil communication passage 7 is connected to the fluid working chamber without passing through the back chamber 15. As shown in FIG.
The oil inlet 6 and the rear chamber 15 are opened to communicate with each other through the outer circumference of the rear chamber 15, and the rear chamber 15 and the fluid working chamber 4 are communicated with each other through a second hole 72 constituting the rear half of the rear chamber. By maintaining the chamber 15 at an intermediate pressure lower than the high pressure and higher than the pressure in the fluid working chamber 4, and by passing the injected oil through the back chamber 15,
The Oldham ring 18 may also be lubricated at the same time. Note that the first hole 71 constituting the first half of the oil communication passage 7 in FIG. 4 is connected to the movable scroll 3 as shown in FIG.
It may be replaced with an oil groove 73 provided on the back surface of the holder.

Furthermore, in each of the above embodiments, oil was injected into the fluid working chamber 4 in the intermediate pressure region in order to prevent suction heating, but oil was injected into the fluid working chamber 4 through the low pressure suction port 25. In this case, in the case of the one shown in FIG. 4 or 5, the second hole 72 in the oil communication passage 7 is made into a straight through hole and communicated with the suction port 25, or such a second hole 72 is provided. Without opening a communication hole in the bottom wall of the suction port 25 in the fixed scroll 2, or opening a communication hole in the bottom wall of the suction port 25 in the fixed scroll 2
The outer diameter of the end plate 3 is made small so that the rear chamber 15 and the suction port 25 are communicated with each other as the end plate 3 revolves.

[0034]

According to the invention as set forth in claim 1, it is possible to prevent excessive oil filling into the fluid working chamber 4 without using a capillary tube, and moreover, by adjusting the opening position of the oil communication passage 7. The amount of injected oil can be easily and appropriately managed.

According to the second aspect of the invention, suction heating caused by oil injection can also be prevented.

According to the third aspect of the invention, the sliding characteristics between the seal member 5 and the movable scroll 3 can also be improved.

According to the fourth aspect of the invention, the passage structure for oil injection can be simplified.

According to the fifth aspect of the invention, power loss due to interference between the oil used for injection and the crank pin portion 90 can also be reduced.

According to the invention described in claim 6, the oil inlet 6
It is also possible to improve the oil transfer between the oil communication passage 7 and the oil communication passage 7.

According to the seventh aspect of the invention, sealing and lubrication in the thrust direction between the movable scroll 3 and the fixed scroll 2 can also be performed satisfactorily.

[Brief explanation of drawings]

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

FIG. 2 is a sectional view of main parts showing the second embodiment.

FIG. 3 is a sectional view of main parts showing the third embodiment.

FIG. 4 is a sectional view of main parts showing the fourth embodiment.

FIG. 5 is a sectional view of main parts showing the fifth embodiment.

FIG. 6 is a sectional view of a main part of a conventional scroll compressor.

[Explanation of symbols]

1 Sealed casing 2 Fixed scroll 3 Movable scroll 4 Fluid working chamber 5 Seal member 6 Oil inlet 7 Oil communication passage 8 Frame 9 Crankshaft 31　End plate 51 Oil passage 53 Biasing means 80 Containment room 81 Oil pool 82 Oil drain hole 90 Crank pin part

Claims (7)

[Claims] Claim 1: A fixed scroll 2 and a movable scroll 3 having a spiral body are housed in a high-pressure dome-shaped hermetic casing 1, and between the spiral bodies of these scrolls 2 and 3, the spiral center is moved from a low pressure area on the outer circumferential side of the spiral to a spiral center. In a scroll-type fluid machine that defines a fluid working chamber 4 whose pressure changes over a high pressure region on the side, an annular ring is provided on the back surface of the end plate 31 of the movable scroll 3 to divide the end plate 31 into a center side and an outer peripheral side. The end plate 3 of this seal member 5 is interposed with a seal member 5.
1, an oil inlet 6 extending from an oil area leading to the inside of the casing 1 is opened, and an oil inlet 6 is opened in the end plate 31 of the movable scroll 3 as the movable scroll 3 revolves. A scroll type fluid machine characterized in that an oil communication passage 7 is formed which communicates with the working chamber 4 intermittently, and an outlet portion of the oil communication passage 7 is communicated with the working chamber 4. 2. A scroll-type fluid machine according to claim 1, wherein the outlet of the oil communication passage 7 opens into the fluid working chamber 4 located in an intermediate pressure region. Claim 3: The oil inlet 6 is attached to the end plate 3 of the movable scroll 3.
3. The scroll-type fluid machine according to claim 1, further comprising a ring groove surrounding the center of the scroll-type fluid machine. 4. A frame 8 having a housing chamber 80 for a crank pin portion 90 that drives the movable scroll 3;
An oil pool 81 is provided at the bottom of the crankshaft 9 to release the oil pumped up to the crankshaft 9, and this oil pool 81 and the oil inlet 6 are communicated through an oil passage 51 formed in the seal member 5. The scroll type fluid machine according to claim 1. 5. A bottom portion of the storage chamber 80 is provided below the rotation area of the crank pin portion 90, and an oil drain hole 82 is provided in the storage chamber 80 for draining oil accumulated in the rotation area of the crank pin portion 90. 5. The scroll type fluid machine according to claim 4, wherein the scroll type fluid machine has an opening. 6. The scroll-type fluid machine according to claim 1, wherein a biasing means 53 is interposed at the back of the seal member 5. 7. The outlet portion of the oil communication passage 7 is connected to the movable scroll 3.
2. The scroll-type fluid machine according to claim 1, wherein the scroll-type fluid machine has an opening at the tip of the spiral.