JP2003227480A - Scroll-type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll-type compressor wherein the lubrication and sealing in a scroll-type compressing mechanism are secured even in the operation of low rotating speed, in the scroll-type compressor of variable operational rotating speed. <P>SOLUTION: A storage part 51 positioned in a high pressure gas atmosphere and a suction port SUC of the scroll-type compressing mechanism 34 are connected by a lubricant supply channel 100. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used in, for example, a refrigerating apparatus, an air conditioner, etc. The present invention relates to a technique suitable for use in lubricating.

[0002]

2. Description of the Related Art A scroll type compressor which has been widely used for compressing a refrigerant gas in a refrigerating apparatus or an air conditioner has heretofore been provided with a fixed scroll member, an orbiting scroll member and a rotation preventing mechanism. It constitutes the mold compression mechanism. In this scroll type compression mechanism, one fixed scroll member is an immovable scroll fixedly supported in a housing connecting the suction pipe and the discharge pipe. The other orbiting scroll member is arranged in a state of being meshed with the fixed scroll member in the up-down direction or the left-right direction, is prevented from rotating by a rotation preventing mechanism, is connected to a drive source such as an electric motor, and is fixed to the fixed scroll member. On the other hand, an orbiting motion is performed. The orbiting scroll member comes into contact with the fixed scroll member at a plurality of contact points to form a crescent-shaped compression chamber, and the compression chamber moves toward the inside while reducing the volume from the outer peripheral side, so that suction / compression Discharge can be performed simultaneously.

Also in the scroll type compressor, it is necessary to lubricate each sliding portion for the purpose of preventing seizure and cooling. For this reason, in scroll type compressors, a storage section for storing lubricating oil has conventionally been provided at the bottom of a housing, and for example, a lubricating oil pump mechanism provided near the lower end of the rotating shaft of an electric motor provided the rotating shaft and the like. The lubricating system is configured to supply the lubricating oil from the upper end surface of the eccentric pin (drive pin) on the upper portion of the rotating shaft to each sliding portion through the oil passage.

The structure and lubrication system of a hermetic vertical scroll compressor will be briefly described below with reference to FIGS. 4 and 5 as a conventional example. This scroll type compressor 1 includes a housing 2 having a bottomed cylindrical shape, a scroll type compression mechanism 4 supported by an upper bearing 3 in an upper part of the housing 2, and below the scroll type compression mechanism 4, that is, the housing 2.
And a motor 5 as a driving means, which is arranged to be supported by an upper bearing 3 and the like at a lower part thereof, and a rotary shaft 6 of the motor 5.
Is connected to the lower part of the scroll compression mechanism 4.

In the housing 2, the lower end and the upper end of the tubular portion 2a are closed by a bottom portion 2b and a lid portion 2c, respectively. 2 c forms a closed space in which the discharge pipe 8 is connected in a protruding state. The scroll-type compression mechanism 4 is a fixed scroll member 9 fixed to the upper bearing 3, and an orbiting scroll supported between the upper bearing 3 and the fixed scroll member 9 via a thrust bearing 10 so as to orbit. Member 11 and the orbiting scroll member 1
1 is provided on the outer surface of the orbiting scroll member 11, and a rotation preventing mechanism 12 including a well-known Oldham link or the like for preventing the rotation of the orbiting scroll member 11 while preventing its rotation.

The fixed scroll member 9 is formed on a fixed side end plate 9a, a spiral fixed side spiral body 9b standing on the inner surface of the fixed side end plate 9a, and a peripheral portion of the fixed side end plate 9a. And the fixed side spiral body 9c.
A tip seal 13 is fitted on the tip surface of b. In the fixed side end plate 9a, a discharge passage 14 is vertically formed in a central portion of the fixed side end plate 9a, and an upper surface thereof serves as a partition member for dividing the housing 2 into a high pressure chamber HR and a low pressure chamber LR. A discharge cover 15 is provided. A discharge port 16 is opened at the center of the discharge cover 15, and a discharge valve 17 that opens and closes the discharge port 16 is provided. In the high pressure chamber HR,
The open end of the discharge pipe 8 is fixed in a penetrating state,
And the high-pressure chamber HR are connected.

A suction pipe 7 is provided on the outer peripheral portion of the upper bearing 3.
A suction port 18 is formed to guide a fluid (hereinafter, referred to as a compressed fluid) introduced into the housing 2 from the inside to the inside of the fixed side end plate 9a of the fixed scroll member 3 and the fixed wall 9c. . The suction port 18 is connected to a suction chamber 19 formed between the fixed scroll member 9 and the orbiting scroll member 11. Therefore, the compressed fluid introduced from the suction pipe 7 into the housing 2 is sucked from the suction chamber 19 to the scroll compression mechanism 4 through the suction port 18.

The orbiting scroll member 11 includes an orbiting side end plate 11a arranged to face the fixed side end plate 9a.
Fixed side spiral body 9 erected on the inner surface of the swivel side end plate 11a
The spiral side spiral body 11b meshed with b is provided, and the tip seal 13 is fitted to the tip end surface of the spiral side spiral body 11b. A cylindrical boss 20 is erected on the outer surface of the turning-side end plate 11a with the same axis line, and a bush 21 is provided inside the boss 20.
It is rotatably fitted through 2. In addition, the bush 21 has a through hole 21a that is eccentric from the axis in the bush 21.
Are formed.

The fixed scroll member 9 and the orbiting scroll member 11 are eccentric to each other by a predetermined distance, and the side surfaces of the fixed side spiral body 9b and the orbiting side spiral body 11b are in line contact with each other at a plurality of points. They are meshed with a phase difference of 180 degrees. Further, in this state, the tip seals 13 of the fixed-side spiral body 9b and the swirl-side spiral body 11b come into close contact with the inner surfaces of the swirl-side end plate 11a and the fixed-side end plate 9a, respectively, and as shown in FIG. The compression chambers P, which are hermetically sealed spaces, are formed at a plurality of locations having a point-symmetrical positional relationship with respect to the centers of the spiral body 9b and the swirl-side spiral body 11b. It should be noted that the orbiting scroll member 11 revolves around the orbit with respect to the upper bearing 3 and the fixed scroll member 9 fixed to the upper bearing 3 by a rotation preventing mechanism 12 having a well-known Oldham link in a state in which the rotation is prevented. It is arranged so that it can be exercised.

The rotating shaft 6 of the motor 5 is eccentrically supported by an upper bearing 23 arranged on the inner peripheral surface of the upper bearing 3 and a lower bearing 24 located below the motor 5 and eccentric to a predetermined amount from the axis. The pin 25 is provided on the upper end in a protruding state. The eccentric pin 25 is inserted into the through hole 21a of the bush 21 and rotatably supports the bush 21. A balance weight that rotates integrally is fixed to an appropriate place such as the rotary shaft 6.

An oil passage 26 is formed in the eccentric pin 25 and the rotary shaft 6 so as to vertically pass therethrough, and a lubricating oil pump mechanism 27 is provided at the lower end of the rotary shaft 6. The lubricating oil pump mechanism 27 is connected to the lower end of the oil passage 26. A lubricating oil reservoir 28 is provided in the bottom portion 2b of the housing 2, and a lubricating oil pump mechanism 27 at the lower end of the rotary shaft 6 is disposed in the lubricating oil in the reservoir 28. The symbol L in the figure indicates the oil level of the lubricating oil stored in the storage section 28.

Next, a method of compressing a gas (compressed fluid) in the scroll compressor 1 having the above structure will be described.
By driving the motor 5, the rotation of the rotary shaft 6 is transmitted to the orbiting scroll member 11 via the eccentric pin 25, the bush 21, the orbiting bearing 22, and the boss 20, and the orbiting scroll member 11 is rotated by the rotation preventing mechanism 12. The orbiting movement of the fixed scroll member 9 is performed with the rotation of the fixed scroll member 9 blocked. At this time, the gas of the compressed fluid is supplied from the suction pipe 7 into the housing 2 and the motor 5
While cooling the suction port 18 and the suction chamber 19
And is supplied to the compression chamber P via.

The gas in the compression chamber P is transferred to the central portion while being compressed as the volume of the compression chamber P is reduced by the revolving movement of the orbiting scroll member 11. In this way, the gas compressed further pushes the discharge valve 17 from the discharge passage 14 and the discharge port 16 to open the high pressure chamber H.
It is discharged into the R and is guided from the high pressure chamber HR to the outside of the compressor by the discharge pipe 8.

Further, the lubricating oil stored in the storage portion 28 of the bottom portion 2b is sucked up by the lubricating oil pump mechanism 27 and is discharged through the oil passage 26 from the oil supply outlet 26a at the tip of the eccentric pin 25, and the bush 21, Slewing bearing 2
After lubricating 2 and the eccentric pin 25, they collect in the oil sump 29. Then, this lubricating oil is further supplied to the respective lubrication parts such as the thrust bearing 10 and the rotation preventing mechanism 12 so as to overflow from the upper part of the oil sump 29, and after passing through the respective parts for lubrication, the bottom part of the housing 2 is stored. It is returned to the section 28 and repeatedly circulated. Further, the lubricating oil in the storage portion 28 is agitated by the rotation of the drive motor 5 into a mist state, and the oil supplied to the lubricating portions such as the thrust bearing 10 and the rotation preventing mechanism 12 is a compressed fluid gas. With suction port 1
8 and the suction chamber 19 to be supplied to the compression chamber P to lubricate the sliding portion in the scroll-type compression mechanism 4 and to compress the compression chamber P.
There is a seal between them. Reference numeral 30 in the drawing is an oil drain hole for discharging the lubricating oil in the oil sump 29 to the storage portion 28 of the bottom portion 2b.

[0015]

However, the above-described conventional lubricating system for a scroll compressor has the following problems. That is, in the above-described conventional lubrication system, since the mist-like lubricating oil is supplied into the scroll type compression mechanism 4 together with the compressed fluid such as the refrigerant gas sucked through the suction pipe 7, for example, the inverter. When the motor 5 to be controlled is used as a drive source to operate in a wide rotation speed range, the amount of lubricating oil that becomes mist due to agitation decreases in a low rotation speed range. Therefore, the circulation amount of the lubricating oil in the system also decreases, and as a result, the supply amount of the lubricating oil supplied to the scroll compression mechanism 4 decreases, and the lubrication performance and the sealability of the scroll compression mechanism 4 decrease. Is a problem.

[0016] Such deterioration of lubrication performance deteriorates the sealing function between the compression chambers P, leading to deterioration of the performance of the scroll compressor 1. In addition, the fixed scroll member 9
In addition, since the lubricating oil is insufficient in the sliding portion between the orbiting scroll members 11, in the worst case, there is a concern that seizure may occur and durability and reliability may be reduced. Further, the decrease in the sealing property causes a large amount of compressed gas to leak between the plurality of compression chambers, resulting in a decrease in performance.

The present invention has been made in view of the above circumstances, and in a scroll type compressor of variable operating speed, it is possible to reliably lubricate and seal the scroll type compression mechanism even at low speed operation. An object is to provide a scroll type compressor that can be implemented.

[0018]

The present invention adopts the following means in order to solve the above problems. That is, in the scroll compressor according to claim 1, the lubricating oil reservoir in the housing is provided in an atmosphere of high-pressure gas compressed by the scroll compressor, and the reservoir and the scroll compressor are provided. The inside is connected with a lubricating oil supply passage. According to the scroll type compressor of the first aspect, the lubricating oil in the storage part is directed to the suction port due to the pressure difference between the high pressure environment in the storage part and the pressure environment lower than the high pressure in the scroll type compression mechanism. Be able to form a stream.

A scroll type compressor according to a second aspect is the scroll type compressor according to the first aspect.
An oil amount control device for limiting the flow rate of the lubricating oil discharged into the scroll type compression mechanism is provided in the lubricating oil supply passage. According to the scroll compressor of claim 2, the lubricating oil flowing from the reservoir to the scroll compression mechanism is passed through the oil amount control device,
It will be possible to control the flow rate as designed.

The scroll type compressor according to a third aspect is the scroll type compressor according to the second aspect.
The oil amount control device includes a plurality of orifices for reducing the flow rate of the lubricating oil in multiple stages. According to the scroll compressor of the third aspect, the flow rate control for obtaining the desired lubricating oil flow rate can be performed with high accuracy and easily by combining the number of orifices and their hole diameters. become. Further, when forming the same pressure loss, it is possible to form an orifice through a plurality of orifices as in the present invention, rather than forming it through a single orifice, without making the orifice diameter per unit orifice extremely small. I will be done.

A scroll type compressor according to a fourth aspect is the scroll type compressor according to the third aspect.
The oil amount control device, an oil retaining portion for temporarily accumulating the lubricating oil on the way from the reservoir to the respective orifices,
An oil guide pipe that guides the lubricating oil of the oil retaining portion to each of the orifices, wherein the oil retaining portion has an opening vertically above.
The suction port of the oil guide pipe is inserted into the oil retaining portion through the opening. Claim 4
According to the scroll compressor described in (1), even if the refrigerant is dissolved in the lubricating oil taken into the oil retaining portion, it foams into bubbles in the oil retaining portion and can escape through the opening in the vertically upper portion. As a result, it becomes possible to separate the lubricating oil and the air bubbles that flow into the scroll type compression mechanism and control the amount of lubrication intended.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a scroll compressor of the present invention will be described below with reference to FIGS. 1 to 3, but it goes without saying that the present invention is not limited to this. Is. Note that FIG. 1 is a view showing the scroll compressor of the present embodiment, and is a cross-sectional view as seen from a cross section including the axis of the rotary shaft. Further, FIG. 2 is a view showing an oil amount control device of the scroll compressor,
It is the A section enlarged view of FIG. Further, FIG. 3 is a view showing a main part of the oil amount control device, and is an enlarged view of a B part in FIG. 2.

As shown in FIG. 1, the scroll compressor 31 of the present embodiment has a bottomed cylindrical high-pressure housing 32.
A scroll-type compression mechanism 34 supported by an upper bearing 33 inside the high-pressure housing 32, and a scroll-type compression mechanism 34 supported below the scroll-type compression mechanism 34, that is, in the lower part of the housing 32 by an upper bearing 33 and the like. The rotary shaft 36 of the motor 35 is connected to the lower portion of the scroll compression mechanism 34.

In the high-pressure housing 32, the lower end and the upper end of the tubular portion 32a are closed by the bottom portion 32b and the lid portion 32c, respectively, and the entire housing has a pressure capable of withstanding the high-pressure gas pressure compressed by the scroll type compression mechanism 34. It is a container. Then, the cylindrical portion 32a of the high-pressure housing 32
A suction pipe 37 for introducing the refrigerant gas to be compressed is connected to the inside of the scroll type compression mechanism 34 in a penetrating state, and the high pressure refrigerant gas compressed by the scroll type compression mechanism 34 is supplied to the tubular portion 32a. A discharge pipe 38 that leads to the outside is connected, and one end of the discharge pipe 38 opens into the high pressure gas atmosphere in the high pressure housing 32.

The scroll type compression mechanism 34 revolves around a thrust bearing surface 40 in a sealed space formed by the fixed scroll member 39 fixed to the upper bearing 33 and the upper bearing 33 and the fixed scroll member 39. An orbiting scroll member 41 that is movably supported, and a rotation preventer that is provided on the outer surface of the orbiting scroll member 41 and that includes a well-known Oldham link or the like that allows rotation of the orbiting scroll member 41 while preventing its rotation. And a mechanism 42.

The fixed scroll member 39 is formed on the fixed side end plate 39a, the spiral fixed side spiral body 39b standing on the inner surface of the fixed side end plate 39a, and the peripheral portion of the fixed side end plate 39a. Among these, the fixed side end plate 39a is provided with a discharge port 43 vertically formed in the central portion of the fixed end plate 39a, and a discharge valve for opening and closing the discharge port 43. 44 are provided. The suction pipe 37 is connected to the peripheral wall portion 39 c, and the scroll compression mechanism 34 is connected to the suction pipe 37.
Refrigerant gas to be compressed is sucked into the sealed space.

The orbiting scroll member 41 has an orbiting side end plate 41a which is arranged to face the fixed side end plate 39a.
And a spiral-shaped swirl-side spiral body 41 that is erected on the inner surface of the swirl-side end plate 41a and meshes with the fixed-side spiral body 39b.
b. A cylindrical boss 45 is erected on the outer surface of the turning side end plate 41a with the same axis line, and a bush 46 is rotatably fitted inside the boss 45. Then, a through hole that is eccentric from the axis of the rotary shaft 36 is formed inside the bush 46. Between the orbiting scroll member 41 and the upper bearing 33, the orbiting scroll member 41 is pressed against the fixed scroll member 39 at a high pressure and a pressure lower than the high pressure and higher than the suction pressure, and the orbiting scroll 41 and the fixed scroll 39 are pressed. In order to seal and each other in the axial direction,
High-pressure partition seals 60 for forming high-pressure chambers, respectively
And an intermediate pressure partition seal member 61 for forming an intermediate pressure chamber.

The fixed scroll member 39 and the orbiting scroll member 41 are eccentric to each other by a predetermined distance,
The fixed-side spiral body 39b and the swirl-side spiral body 41b are meshed with each other with a phase difference of 180 degrees so that the side surfaces thereof are in line contact at a plurality of points. Also, in this state, the back pressure that the tips of the fixed side spiral body 39b and the orbiting side spiral body 41b press against the inner surface of the orbiting side end plate 41a and the fixed side end plate 39a from the side opposite to the spiral body of the orbiting scroll to the fixed scroll, respectively. As a result, the compression chambers P, which are hermetically sealed spaces, are formed at a plurality of locations that are in point-symmetrical relationship with respect to the centers of the fixed-side spiral body 39b and the swirl-side spiral body 41b. The orbiting scroll member 41 revolves around the orbit with respect to the upper bearing 33 and the fixed scroll member 39 fixed to the upper bearing 33 by a rotation preventing mechanism 42 including a well-known Oldham link in a state where the rotation is prevented. It is arranged so that it can be exercised.

The rotating shaft 36 of the motor 35 includes an upper bearing 33 and a lower bearing 6 located below the motor 35.
An eccentric pin 48, which is rotatably supported by 0 and is eccentric by a predetermined amount from its axis, is provided at the upper end in a protruding state. Eccentric pin 4
8 is inserted into the through hole of the bush 46,
Is rotatably supported. A balance weight (not shown) that rotates integrally is fixed to an appropriate place such as the rotary shaft 36.

The eccentric pin 48 and the rotary shaft 36 include
An oil passage 49 is formed so as to vertically pass therethrough, and a lubricating oil pump mechanism 50 is provided at the lower end of the rotary shaft 36.
Is provided. The lubricating oil pump mechanism 50 is connected to the lower end of the oil passage 49. Further, a storage portion 51 for storing lubricating oil is provided at the bottom portion 32b in the housing 32 in which the atmosphere of the refrigerant gas (high pressure gas) compressed by the scroll type compression mechanism 34 is provided. In a normal state where a predetermined amount or more of lubricating oil is collected in 51, the lubricating oil pump mechanism 50 at the lower end of the rotary shaft 36 is located in the lubricating oil. In addition, L in the drawing indicates the oil level of the lubricating oil.

The scroll compressor 31 of this embodiment employs a construction in which the reservoir 51 and the suction port SUC of the scroll compressor 34 are directly connected by the lubricating oil supply passage 100. There is. This lubricating oil supply channel 100 is
The oil passage 49 (hereinafter, referred to as the oil passage 100a) whose lower end is opened so as to suck the lubricating oil in the storage portion 51 is communicated with the upper end opening of the oil passage 100a, and the boss 4 is connected.
5, the clearance flow path 100 between the inner surface of the concave portion 5 and the outer surface of the bush 46.
b, an upper bearing inner channel 100c formed in the upper bearing 33 so as to communicate between the clearance channel 100b and the suction port SUC, and from the upper bearing inner channel 100c to the suction port SUC. It is configured to include a return flow channel 100d that returns an excess of the lubricating oil to the storage section 51. Then, in the lubricating oil supply passage 100, the suction port S
An oil amount control device 200 that limits the flow rate of the lubricating oil discharged to the UC is connected.

As shown in FIG. 2, the oil amount control device 200
Is the upper bearing internal flow passage 100c and the return flow passage 100d.
An oil retaining portion 201 connecting between the outer retaining body 201 and the outer body 20 fixed in the oil retaining portion 201 so that its axis line is vertically upward.
2 and the inner body 203, a plurality of orifices 204 and packing 205 (see FIG. 3) held and fixed in a state of being sandwiched between the outer body 202 and the inner body 203, and fixed to the lower end of the inner body 203. And a strainer 206.

The oil retaining portion 201 is a recessed space for temporarily storing the lubricating oil on the way from the storage portion 51 to each orifice 204, and has an opening 201a vertically above the upper bearing 33. Has been formed. The outer main body 202 is a cylindrical body having a male screw formed around it, and is screwed and fixed to a female screw hole formed in the upper bearing 33. A discharge port 202a for discharging the lubricating oil whose flow rate has been adjusted is formed at the upper end of the outer main body 202. In addition, reference numeral 40x shown in FIG. 2 indicates that the lubricating oil discharged from the discharge port 202a is directly above the scroll compression mechanism 3.
4 is a through hole formed in the upper bearing 40 so as to be led out toward 4.

The inner body 203 is an oil guide tube for guiding the lubricating oil of the oil retaining portion 201 to each orifice 204, and the suction port 203b formed at the lower end of the inner body 203 has the opening 201a.
It is inserted into the lubricating oil accumulated in the oil retaining portion 201 through a. Further, this inner body 203 is formed with a male screw on the periphery thereof, and is screwed and fixed to a female screw hole formed inside the outer body 202. A flow path 203a is formed in the inner body 203 in the vertical direction, and each of the orifices 204 is formed.
And, it is communicated with the discharge port 202a through the packing 205. The strainer 206 is provided at the suction port 203b, and removes dust and the like contained in the sucked lubricating oil and prevents clogging of the orifices 204.

As shown in FIG. 3, each of the orifices 20 is
Reference numeral 4 is a perforated disk-shaped component that restricts the flow rate of the lubricating oil discharged toward the suction port SUC, and the orifices 204a are coaxially aligned with each other, and the packings 205 are interposed therebetween. They are superposed in multiple stages at predetermined intervals. Each packing 20
Reference numeral 5 denotes a disk-shaped component having elasticity and having a hole, which serves as a seal material for preventing the lubricating oil flowing through each orifice 204 from bypassing the orifice holes 204a and bypassing each orifice. A space 205a having a diameter larger than that of the orifice hole 204a is secured between the nozzles 204, and the pressure difference between the orifices is stabilized.

The orifices 204 and the packing 205 are alternately superposed on each other and the outer body 2
02, and by screwing the inner body 203 into the outer body 202, the orifices and the packings 205 are tightly pressed against each other.

The conditions for supplying the lubricating oil to the suction port SUC (discharge pressure, discharge flow rate, etc.) depend on the orifice 2
It is possible to make adjustments by combining the number of sheets of No. 04 and the diameter of the orifice holes 204a, and it is possible to control with high accuracy and easily.

Further, when forming the same pressure loss, forming a plurality of orifices 204 as in the present invention makes the diameter of an orifice per unit orifice extremely larger than forming a single orifice. It is more preferable because the size does not have to be reduced. This can be explained by the following formula (1). In addition, this numerical formula (1)
In, Q is the lubricating oil flow rate, A is the flow passage area of the orifice hole, C is the flow coefficient, ΔP is the pressure loss that occurs when passing through the orifice, and ρ is the density of the lubricating oil.

[0039]

[Equation 1]

In the above mathematical expression (1), in order to reduce the lubricating oil flow rate Q so that the lubricating oil sent from the storage portion 51 has a desired discharge amount, the flow passage area A is made smaller, or There are two methods of increasing the pressure loss ΔP.
There is a working limit to reducing the flow path area A.
Therefore, by providing a plurality of orifices 204 in multiple stages and adding a pressure loss ΔP each time when passing through each stage, an appropriate lubricating oil flow rate Q can be obtained without extremely reducing the orifice hole diameter. It has become a thing. That is, when the number of orifices is n (n ≧ 2), ΔP in the above formula (1) becomes ΔP / n, and instead, the hole diameter of the orifice becomes n ^1/4 times. Therefore, it becomes possible to control the flow rate to a desired value without making the hole diameter of the orifice extremely small.

According to the scroll type compressor 31 constructed as described above, the fixed scroll member 39 is driven by driving the motor 35 so that the orbiting scroll member 41 is prevented from rotating by the rotation preventing mechanism 42. Performs a revolving orbiting motion. As a result, the refrigerant gas sucked into the compression chamber P from the suction pipe 37 is compressed as its volume decreases and becomes high-pressure refrigerant gas. This high-pressure refrigerant gas pushes open the discharge valve 44 from the discharge port 43, flows into the high-pressure housing 32, fills the high-pressure housing 32, and is discharged from the discharge pipe 38 to the outside. At this time, the inside of the high pressure housing 32 is in a high pressure state which is the same as or almost the same as the discharge pressure of the scroll type compression mechanism 34, and this high pressure also acts on the lubricating oil liquid level L in the reservoir 51.

On the other hand, the lubricating oil pump mechanism 50 includes the reservoir 5
1 sucks the lubricating oil stored in the oil passage 1, and the oil passage 100a, the clearance passage 100b, and the upper bearing inner passage 1
The oil is sucked up in the order of 00c and supplied to the oil retaining portion 201. Since the pressure inside the oil retaining portion 201 is higher than the pressure at the suction port SUC of the scroll type compression mechanism 34 (differential pressure is generated), this differential pressure is used to
From the oil retaining portion 201 on the high pressure side to the suction port S on the low pressure side
The lubricating oil in the oil retaining portion 201 flows toward the UC so as to be pushed up. Therefore, unlike the conventional mist-like lubricating oil supply by stirring, the supply of the lubricating oil into the scroll-type compression mechanism 34 is stably performed regardless of the operating speed of the scroll-type compressor 31. .

More specifically, the lubricating oil pump mechanism 50 takes in the lubricating oil from the reservoir 51 into the oil retaining portion 201. At this time, a large amount of lubricating oil is supplied and the amount of lubricating oil overflowing from the oil retaining portion 201 is returned to the storage portion 51 again via the return flow passage 100d. The lubricating oil temporarily stored in the oil retaining portion 201 is supplied to each orifice 204 through the flow passage 203a in the inner body 203 by the action of the pressure difference. Since the lubricating oil at this time has passed through the strainer 206, dust and the like have been removed. Further, even if bubbles are dissolved in the lubricating oil taken into the oil retaining portion 201, they are foamed in the oil retaining portion 51 to form bubbles, which can escape through the opening 201a above the vertical direction. It is possible to separate the lubricating oil and the air bubbles that are going on to control the amount of lubrication intended.

The flow rate of the lubricating oil from which bubbles and dust have been removed in this way is adjusted by passing through each orifice 204, and the lubricating oil is supplied to the suction port SUC at an appropriate supply amount.

The scroll type compressor 31 of the present embodiment described above has a storage portion 51 provided in an atmosphere of high pressure gas.
Between the suction port SUC of the scroll type compression mechanism 34 and
A configuration in which the lubricating oil supply channel 100 is used for connection is adopted. According to this configuration, the flow of the lubricating oil is formed by utilizing the pressure difference between the oil retaining portion 201 and the suction port SUC under any operating condition of the scroll compressor 31. Lubrication and sealing in the scroll compression mechanism 34 can be reliably performed even during low-speed operation.

Further, the scroll type compressor 3 of the present embodiment
1 adopts a configuration in which the oil amount control device 200 is provided in the lubricating oil supply passage 100. According to this configuration, it becomes possible to supply the lubricating oil adjusted to an appropriate flow rate. Furthermore, in the present embodiment, the oil amount control device 200 employs a configuration in which a plurality of orifices 204 are provided in multiple stages. According to this configuration, the hole diameter per unit orifice does not have to be made extremely small as compared with the case where the flow rate is controlled by one orifice, so that the flow rate of the lubricating oil can be controlled finely. In addition, since clogging of holes is less likely to occur, it is possible to improve the reliability of flow rate control.

The scroll compressor 3 of this embodiment is also used.
1, the oil amount control device 200 further includes an oil retaining portion 201 and an inner main body 203, and the oil retaining portion 201 has an opening 201a vertically above and a suction port 203 of the inner main body 203.
b is inserted into the oil retaining portion 201 through the opening 201a. According to this configuration, it is possible to reduce bubbles from entering together with the lubricating oil that enters the suction port SUC of the scroll type compression mechanism 34, and it is possible to prevent a decrease in compression efficiency.

In this embodiment, the flow rate control device 20 is used.
Although the configuration in which 0 is provided in the upper bearing 33 is adopted, the configuration is not limited to this, and a configuration in which it is connected to the fixed scroll member 39 side and discharged from the fixed scroll member 39 side to the suction port SUC may be adopted. Further, a configuration may be adopted in which the flow rate control device 200 and the storage unit 51 are directly connected by piping. Further, the scroll compressor 31 of the present embodiment is
Although a case where a high-pressure seal and an intermediate-pressure seal are provided is illustrated, the present invention is not limited to this, and the present invention may be applied to a scroll type compressor having only a high-pressure seal. Also,
It is needless to say that the present invention may be applied to a scroll type compressor that compresses not only a refrigerant but also other compressed fluids.

[0049]

According to the scroll type compressor of the first aspect of the present invention, a lubricating oil supply passage is provided between a storage portion provided in an atmosphere of high pressure gas and a suction port of the scroll type compression mechanism. Adopted a configuration to connect. According to this configuration, the flow of the lubricating oil is formed by utilizing the pressure difference generated between the reservoir and the suction port under any operating condition of the scroll compressor. However, it is possible to surely perform lubrication and sealing in the scroll compression mechanism.

A scroll type compressor according to a second aspect is the scroll type compressor according to the first aspect.
A configuration is adopted in which an oil amount control device is provided in the lubricating oil supply passage. According to this configuration, it becomes possible to supply the lubricating oil adjusted to an appropriate flow rate.

The scroll type compressor according to a third aspect is the scroll type compressor according to the second aspect.
The oil amount control device employs a configuration in which a plurality of orifices are provided in multiple stages. According to this configuration, the hole diameter per unit orifice does not have to be made extremely small as compared with the case where the flow rate is controlled by one orifice, so that the flow rate of the lubricating oil can be controlled finely. Further, since it is difficult for the holes to be clogged, the reliability of the flow rate control can be improved.

A scroll type compressor according to a fourth aspect is the scroll type compressor according to the third aspect.
The oil quantity control device further includes an oil retaining portion and an oil guide pipe, the oil retaining portion has an opening vertically upward, and a suction port of the oil guide pipe is inserted into the oil retaining portion through the opening. Adopted the configuration. With this configuration, it is possible to reduce bubbles from entering together with the lubricating oil that enters the suction port of the scroll-type compression mechanism, and it is possible to prevent a decrease in compression efficiency.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a scroll compressor of the present invention and is a cross-sectional view when seen from a cross section including an axis of a rotary shaft.

FIG. 2 is a diagram showing an oil amount control device of the scroll compressor, which is an enlarged view of a portion A in FIG. 1.

FIG. 3 is a view showing a main part of the same oil amount control device of the scroll compressor, which is an enlarged view of a B part in FIG. 2.

FIG. 4 is a view showing an example of a conventional scroll compressor, and is a cross-sectional view when seen from a cross section including an axis of a rotary shaft.

FIG. 5 is a cross-sectional view showing a meshing state of a fixed scroll member and an orbiting scroll member in the scroll compression mechanism of the scroll compressor.

[Explanation of symbols] 31 ... Scroll compressor 32 ... High-pressure housing (housing) 34 ... Scroll type compression mechanism 51 ... Reservoir 100 ... Lubricant supply channel 200 ... Oil quantity control device 201: Oil retaining section 201a ... Opening 203 ... Inner body (oil guide tube) 203b ... Suction port 204 ... Orifice SUC ・ ・ ・ Suction port

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H029 AA02 AA14 AB02 AB03 BB06                       CC33                 3H039 AA06 AA12 BB11 CC27 CC42

Claims (4)

[Claims] 1. A lubricating oil reservoir in a housing is provided in an atmosphere of high-pressure gas compressed by a scroll compression mechanism, and a lubricating oil supply flow is provided between the reservoir and the scroll compression mechanism. A scroll-type compressor characterized by being connected by road. 2. The scroll compressor according to claim 1, wherein the lubricating oil supply passage is provided with an oil amount control device for limiting a flow rate of the lubricating oil discharged to the scroll compression mechanism. Scroll compressor characterized by. 3. The scroll compressor according to claim 2, wherein the oil amount control device is provided with a plurality of orifices that throttle the flow rate of the lubricating oil in multiple stages. . 4. The scroll compressor according to claim 3, wherein the oil amount control device temporarily retains the lubricating oil on the way from the reservoir to each of the orifices,
An oil guide pipe for guiding the lubricating oil of the oil retaining portion to each of the orifices is further provided, the oil retaining portion has an opening vertically upward, and a suction port of the oil guide pipe passes through the opening to retain the oil. A scroll type compressor characterized by being inserted in the oil section.