JP4063221B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a flow control means for lubricating oil in a scroll compressor for a refrigeration cycle.

  Generally, a scroll compressor for a refrigeration cycle supplies lubricating oil separated from a compressed refrigerant to a sliding portion such as a scroll, a back pressure chamber for receiving a thrust force of a turning scroll, or the like.

  Since sliding parts such as scrolls and back pressure chambers are lower in pressure than the discharge pressure, compressed refrigerant and lubricating oil having almost the same pressure as the compressed refrigerant can be removed via some flow control means. It is necessary to supply to the sliding part and the back pressure chamber.

  Conventionally, a throttle hole with a small diameter is used for this type of flow control means.

  However, the flow rate control means using the small-diameter throttle hole may be clogged with the wear gas of the sliding portion mixed in the discharge gas or the lubricating oil or the cutting powder generated in the manufacturing process.

On the other hand, Patent Document 1 discloses a technique as a flow rate control means that does not require an extremely small diameter per unit orifice by stacking a plurality of orifices. However, since it is necessary to stack the orifices in stages, there is a problem that the installation space for the flow rate control means becomes large.
JP 2003-227480 A

  The present invention has been made in view of the above problems, and provides a scroll compressor provided with lubricating oil flow rate control means capable of obtaining desired flow rate control characteristics without using a small-diameter throttle hole. The purpose is to do.

  In achieving the above object, the invention described in claim 1 is directed to a fixed scroll (8) fixed to a housing (4) having a rotating shaft (3) therein, and accompanying rotation of the rotating shaft (3). Orbiting scroll (7) that revolves and meshes with fixed scroll (8) to compress refrigerant, and lubricant oil separated from refrigerant compressed by fixed scroll (8) and orbiting scroll (7) is compressed. Scroll-type compression having a supply path (39) for supplying a part (16) whose pressure is lower than the discharge pressure of the refrigerant and a flow rate control means (25) for controlling the amount of lubricating oil flowing through the supply path (39) The flow rate control means (25) intermittently communicates the supply path (39) and the portion (16) having a pressure lower than the discharge pressure with the revolution of the orbiting scroll (7). Features.

  Thus, since the lubricating oil is supplied only when the supply path (39) is in communication with the portion (16) having a pressure lower than the discharge pressure, the lubricating oil is lubricated as compared with the case where the lubricating oil is continuously supplied. It is possible to limit the amount of oil supplied.

  Therefore, it is possible to obtain a desired flow rate control characteristic without using a small-diameter throttle hole as compared with the case where the lubricating oil is continuously supplied.

According to the first aspect of the present invention, the flow rate control means (25) includes the orbiting scroll fixed scroll side hole (37) provided on one end surface of the orbiting scroll (7) on the fixed scroll (8) side, The orbiting scroll back side hole (26) provided on the other end surface of the orbiting scroll (7) opposite to the fixed scroll (8) and communicating with the inside of the orbiting scroll fixed scroll side hole (37) and the orbiting scroll (7). It is comprised from these.

According to the first aspect of the present invention, the flow rate control means (25) includes a position where the orbiting scroll fixed scroll side hole (37) communicates with the supply path (39), and the orbiting scroll rear side hole (26). And a position where the part (16) having a pressure lower than the discharge pressure is communicated is intermittently switched with the revolution of the orbiting scroll (7).

According to a second aspect of the present invention, in the first aspect of the present invention, an oil storage for storing lubricating oil is provided in a communication portion between the orbiting scroll fixed scroll side hole (37) and the orbiting scroll rear side hole (26). A part (38) is provided.

  Accordingly, when the supply path (39) and the orbiting scroll fixed scroll side hole (37) communicate with each other, the lubricating oil flowing from the supply path (39) is stored in the oil storage section (38), and then the orbiting scroll rear side hole ( 26) and the part (16) having a pressure lower than the discharge pressure communicate with each other, the lubricating oil stored in the reservoir (38) flows into the part (16) having a pressure lower than the discharge pressure.

  That is, by adjusting the size of the oil storage section (38), it is possible to adjust the amount of lubricating oil supplied to the portion (16) that is lower than the discharge pressure every time the orbiting scroll (7) revolves.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the portion (16) having a pressure lower than the discharge pressure is a back pressure chamber ( 16).

The invention according to claim 4 is the invention according to claim 3 , characterized in that the back pressure chamber (16) is provided in an annular shape.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the carbon dioxide-based refrigerant is compressed by the fixed scroll (8) and the orbiting scroll (7). It is characterized by doing.

  When a carbon dioxide refrigerant is used, the refrigeration cycle operates at a pressure higher than that of a conventional chlorofluorocarbon refrigerant. When the flow control means (25) using a small-diameter throttle hole is applied, the required flow control characteristic is obtained. When trying to obtain it, an aperture with a very small diameter is required, so problems such as clogging due to wear powder or cutting powder are likely to occur, and the effect of applying the present invention is very large.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

( Reference example )
In the following, reference examples to be referred to in describing the embodiment of the present invention will be described with reference to FIGS.

(Configuration of this reference example )
FIG. 1 is a cross-sectional view of a compressor 100 of a reference example . The compressor 100 is a component that constitutes a supercritical refrigeration cycle that uses a carbon dioxide-based refrigerant, and is connected to a refrigerant suction pipe 1 at an upper part and a refrigerant discharge pipe 2 at a lower part of a side wall, and extends in a vertical direction. A motor 5, a middle housing 6, a turning scroll 7, a fixed scroll 8, an oil separator 9, and a block 10 are arranged in this order from the top in a housing 4 having 3.

  The refrigerant suction pipe 1 is connected to a low-pressure refrigerant pipe connected to an evaporator (not shown) of the refrigeration cycle, and protrudes from the upper end of the housing 4.

  The refrigerant discharge pipe 2 is connected to a high-pressure refrigerant pipe connected to a condenser of a refrigeration cycle (not shown), and protrudes from the lower part of the side wall of the housing 4.

  The rotating shaft 3 is rotatably held by a bearing 11 provided in the middle housing 6 and a bearing 42 provided on the upper portion of the motor 5, and a crank portion 12 eccentric at a lower end with respect to the shaft center by a predetermined amount. Is formed.

  The motor 5 is a known electric motor including a stator coil 13 fixed to the inner peripheral surface of the housing 4 and a rotor 14 that rotates within the stator coil 13. The motor 5 rotates the rotary shaft 3 when the stator coil 13 is energized by a control device (not shown).

  The middle housing 6 is installed in the housing 4, holds the above-described bearing 11, and forms a back pressure chamber 16, which will be described later, between the back surface of the turning end plate portion 15 of the turning scroll 7 which will be described later. .

  The orbiting scroll 7 includes a disc-shaped orbiting end plate portion 15, a spiral type orbiting blade portion 17 formed so as to protrude downward in the axial direction from the orbiting end plate portion 15, and the orbiting end plate portion 15. It has a boss portion 18 formed on the back surface (the upper side in the axial direction).

  The orbiting scroll 7 is connected to the crank portion 12 of the rotating shaft 3 by a boss portion 18 and revolves as the rotating shaft 3 rotates.

  The fixed scroll 8 includes a fixed end plate portion 19 fixed in the housing 4 and a spiral fixed blade portion 20 formed so as to protrude upward in the axial direction from the fixed end plate portion 19. When the swirl vane portion 17 and the fixed vane portion 20 are engaged with each other, a plurality of working chambers 21 that look like crescents when viewed from the axial direction are formed between the swirl vane portion 17 and the fixed vane portion 20.

  When the rotary shaft 3 rotates and the orbiting scroll 7 revolves, the working chamber 21 opens toward the suction chamber 22 provided on the outer periphery of the fixed scroll 8 on the outer periphery of the orbiting scroll 7, and the refrigerant enters the working chamber 21. Inflow. Next, the working chamber 21 moves while contracting toward the center of the orbiting scroll 7 and the fixed scroll 8 while the orbiting scroll 7 revolves, and compresses the refrigerant. When the working chamber 21 reaches the center of the orbiting scroll 7 and the fixed scroll 8, the compressed refrigerant passes through the discharge hole 23 provided at the center of the fixed end plate 19 of the fixed scroll 8, and the fixed end plate. It is discharged into a discharge chamber 24 provided between the part 19 and the block 10.

  The orbiting end plate portion 15 is provided with an orbiting scroll fixed scroll side hole 37, an orbiting scroll back side hole 26, and an orbiting scroll side surface side hole 38 constituting a flow rate control means 25 described later.

  In addition, the fixed end plate portion 19 is provided with a fixed end plate portion hole 27 that forms a lubricating oil supply path 39 described later.

  The block 10 is a member formed of a metal such as iron, and is disposed on the lower end surface of the fixed scroll 8, and closes a recess that houses a discharge valve provided in the fixed scroll to form a discharge chamber 24. It is a member that plays a role.

  The oil separator 9 is a swirling flow type oil separator having a double cylindrical structure including an inner cylinder 29 and an outer cylinder 30, and is provided in a block 10 disposed below the fixed scroll 8 in the housing 4. It is arranged in the oil storage chamber 28 constituted by the formed holes.

  The oil separator 9 is provided in the fixed end plate portion 19, the high-pressure refrigerant is guided by the compressed refrigerant inflow passage 31 through which the refrigerant discharged into the discharge chamber 24 passes, and lubrication in the refrigerant is performed by the centrifugal force of the swirling flow generated by the high-pressure refrigerant. The oil is separated, and the refrigerant from which the lubricating oil is separated is led to the refrigerant discharge pipe 2 through the refrigerant discharge passage 32 provided in the fixed end plate portion 19. The lubricating oil separated by the oil separator 9 is stored in the oil storage chamber 28, and is supplied by the flow rate control means 25 through the lubricating oil supply path 39 including the block hole 33, the throttle 34, and the fixed end plate portion hole 27 provided in the block 10. After the flow rate is controlled, it is sent to the back pressure chamber 16.

  In addition, in the lubricating oil separated by the oil separator 9, a part of the refrigerant is dissolved in the high-pressure atmosphere, and the dissolved refrigerant is vaporized in the low-pressure atmosphere, so that the lubricating oil falls into a forming state. The apparent volume of increases. Here, the high-pressure atmosphere refers to a pressure that is substantially equal to the discharge pressure, and the low-pressure atmosphere refers to a pressure equal to or lower than an intermediate pressure such as the back pressure chamber 16. The block hole 33 is a hole extending from the lower portion of the side wall of the oil storage chamber 28 to the upper end portion of the block 10 (a point in contact with the lower end portion of the fixed end plate portion 19), and is a hole through which high-pressure lubricating oil stored in the oil storage chamber 28 passes. It is.

  The throttle 34 is a well-known throttle element such as an orifice or capillary that is provided in the block hole 33 and controls the flow rate of the lubricating oil.

  The fixed end plate hole 27 extends from the lower end of the fixed end plate 19 (the surface in contact with the upper end of the block 10) to the upper end of the fixed end plate 19 (the surface in contact with the lower end of the turning end plate 15). It is a hole. The lower end of the fixed end plate portion hole 27 communicates with the block hole 33, and the upper end is provided with a seal ring 40, which intermittently communicates with the orbiting scroll fixed scroll side hole 37 when the orbiting scroll 7 revolves. The flow rate control means 25 will be described in detail later.

  The back pressure chamber 16 is an airtight chamber formed by an annular recess provided in a portion in contact with the back surface (upper end surface) of the swivel end plate portion 15 on the lower end surface of the middle housing 6. The inner peripheral side and the outer peripheral side are respectively sealed by a back pressure chamber seal ring 35. The back pressure chamber 16 is supplied after the high-pressure lubricating oil separated from the refrigerant by the oil separator 9 is supplied after the supply amount is controlled by the flow rate control means 25 and reduced to an intermediate pressure. The thrust in the thrust direction applied to the orbiting scroll 7 by the compression pressure is canceled by urging the orbiting scroll 7 in the axial direction from the back side (from the upper side to the lower side) by the pressure of the refrigerant dissolved in the lubricating oil. It has a role of reducing sliding loss between the turning end plate portion 15 and the middle housing 6.

  The lubricating oil sent to the back pressure chamber 16 and the refrigerant dissolved in the lubricating oil are blown out of the middle housing 6 through the pressure control valve 36 disposed in the middle housing 6, and then the outer periphery of the orbiting scroll 7. When the working chamber 21 opens toward the suction chamber 22, it flows into the working chamber 21 together with the refrigerant sucked from the refrigerant suction pipe 1.

  The pressure control valve 36 depressurizes the lubricating oil supplied to the back pressure chamber 16 and the refrigerant dissolved in the lubricating oil in accordance with the pressure outside the middle housing 6 (suction pressure). To send out. By this pressure control valve 36, the difference between the pressure of the refrigerant sucked into the suction chamber 22 and the pressure in the back pressure chamber 16 is always constant.

  Next, the flow rate control means 25 will be described with reference to FIG. 2A shows a state in which the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 forming a part of the lubricating oil supply path 39 communicate with each other as the orbiting scroll 7 revolves. FIG. 2B shows that the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 forming a part of the lubricating oil supply path 39 are not in communication with the revolving motion of the orbiting scroll 7. It is a figure which shows a state.

  The flow rate control means 25, together with the block hole 33, the throttle 34, the seal ring 40, etc., forms a lubricating oil supply path 39. The orbiting scroll fixed scroll side hole 37, the orbiting scroll back side hole 26, and the orbiting scroll side surface. The side hole 38 is comprised.

  The orbiting scroll fixed scroll side hole 37 is a hole provided on the fixed scroll 8 side of the orbiting end plate portion 15, and is a fixed end that intermittently forms part of the lubricating oil supply path 39 with the revolution of the orbiting scroll 7. It communicates with the plate part hole 27.

  The orbiting scroll back surface side hole 26 is a hole provided on the back pressure chamber 16 side (the opposite side to the fixed scroll 8) of the orbiting end plate portion 15. In this embodiment, even if the orbiting scroll 7 revolves, the orbiting scroll rear side hole 26 and the back pressure chamber 16 are always in communication. Further, the orbiting scroll back side hole 26 is provided at a position shifted in the radial direction from the orbiting scroll fixed scroll side hole 37.

  The orbiting scroll side surface hole 38 is a hole provided on the side surface of the orbiting end plate portion 15. With the orbiting scroll side surface hole 38, the orbiting scroll fixed scroll side hole 37 and the orbiting scroll rear surface side hole 26 provided at positions displaced in the radial direction communicate with each other inside the orbiting end plate portion 15. The orbiting scroll side hole 38 is closed by inserting the plug 41 from the outer diameter direction of the orbiting end plate portion 15.

(Operation of this reference example )
Hereinafter, the operation of the flow rate control means 25 in the reference example will be described with reference to FIG.

  When the orbiting scroll 7 revolves, the orbiting scroll fixed scroll side hole 37 also revolves. FIG. 3 is a diagram showing the positional relationship between the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 when the orbiting scroll 7 revolves.

  FIG. 3A shows a state at the moment when the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 overlap each other due to the revolution of the orbiting scroll fixed scroll side hole 37 accompanying the revolution movement of the orbiting scroll 7. (Corresponding to FIG. 2A). When the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 overlap with each other in this way, high-pressure lubricant flows from the fixed end plate portion hole 27 into the orbiting scroll fixed scroll side hole 37. The high-pressure lubricating oil that has flowed into the orbiting scroll fixed scroll side hole 37 passes through the orbiting scroll side hole 38 and the orbiting scroll rear side hole 26 and reaches the back pressure chamber 16. The back pressure chamber 16 has an intermediate pressure, and when high-pressure lubricating oil reaches the back pressure chamber 16, the refrigerant dissolved in the lubricating oil is vaporized.

  FIG. 3B shows that the orbiting scroll fixed scroll side hole 37 revolves with the revolution movement of the orbiting scroll 7, so that the orbiting scroll fixed scroll side hole 37 and the fixed end plate hole 27 do not overlap. It is a figure which shows a certain state (it respond | corresponds to FIG.2 (b)). If the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 are not overlapped with each other in this way, the lubricating oil does not flow from the fixed end plate portion hole 27 into the orbiting scroll fixed scroll side hole 37. The amount of lubricating oil supplied to the pressure chamber 16 can be limited.

In this reference example , the orbiting scroll back side hole 26 is always in communication with the back pressure chamber 16, the orbiting scroll 7 revolves, and the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 overlap. Only when the high-speed lubricating oil is supplied from the fixed end plate hole 27 to the orbiting scroll fixed scroll side hole 37, and the lubricating oil reaching the end of the orbiting scroll rear side hole 26 through the orbiting scroll side hole 38 is The back pressure chamber 16 is immediately supplied.

(Effect of this reference example )
As described above, in this reference example , the lubricating oil is supplied to the back pressure chamber 16 only when the orbiting scroll fixed scroll side hole 37 and the fixed end plate portion hole 27 overlap each other. Therefore, the supply amount of the lubricating oil can be limited as compared with the case where the lubricating oil is continuously supplied to the back pressure chamber 16 from the constant pressure. In other words, the lubricating oil supply path 39 is periodically opened and closed using the revolving motion of the orbiting scroll 7, thereby limiting the substantial supply time and performing the flow rate control. Therefore, it is possible to limit the supply amount of the lubricating oil without using a small diameter throttle hole.

Such an effect is suitable for use in a scroll-type compressor constituting a supercritical refrigeration cycle using a carbon dioxide refrigerant, for example , as in this reference example .

  This is because in the supercritical refrigeration cycle, the discharge pressure of the refrigerant is very high (for example, the suction pressure is 3.8 Mpa, the discharge pressure is 10 Mpa, the pressure in the back pressure chamber 16 is about 5.8 Mpa), and the small-diameter throttle hole In order to obtain a desired flow rate control characteristic, it is necessary to use a very small throttle hole, and there is a high risk that the small diameter throttle hole will be clogged by wear powder generated from a sliding part such as a turning scroll. Because.

Next, the effect of this reference example will be described with specific numerical examples. If the revolution radius of the orbiting scroll fixed scroll side hole 37 is R, the diameter of the orbiting scroll fixed scroll side hole 37 is D, and the diameter of the fixed end plate hole 27 is d, the back pressure is applied during one revolution of the orbiting scroll 7. The ratio α of time during which the lubricating oil is supplied to the chamber 16 is expressed by α = (d + D) / (2πR). For example, when D = 0.5 mm, d = 0.5 mm, and R = 2.5 mm, α = 0.064.

  That is, it is possible to limit the supply amount of the lubricating oil to 0.064 times as compared with the case where the lubricating oil is continuously supplied from the lubricating oil supply path 39 to the back pressure chamber 16 at all times. In other words, even if the cross-sectional area of the small-diameter restrictor is 1 / 0.064 times = 15.6 times, the amount of lubricating oil supplied is always supplied from the lubricating oil supply path 39 to the back pressure chamber 16. Same as the case.

If it demonstrates using a more concrete numerical example, if the diameter (radius) of the small diameter | diaphragm which satisfy | fills the flow volume characteristic requested | required when always supplying lubricating oil is always 0.1 mm, the cross-sectional area S will be the following. S = 0.1 × 0.1 × π. According to this reference example , it is possible to expand the cross-sectional area of the small-diameter restrictor hole up to 15.6 times the cross-sectional area S. Therefore, if the diameter obtained by expanding the cross-sectional area by 15.6 times is R ′, 0.1 × 0.1 × π × 15.6 = R ′ × R ′ × π, R ′ = 0.39 mm, which is a throttle hole satisfying the required flow rate characteristics compared to the case of always supplying lubricating oil. It is possible to increase the diameter.

  Therefore, compared with the case where the lubricating oil is continuously supplied to the back pressure chamber 16, the required flow rate control characteristic can be obtained without using a small diameter throttle hole.

( Embodiment )
Next, an embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol was attached | subjected to the site | part same as the reference example mentioned above .

In the reference example described above , the orbiting scroll back side hole 26 is always in communication with the back pressure chamber 16, and when the orbiting scroll fixed scroll side hole 37 and the fixed end plate part hole 27 are overlapped by the revolving motion of the orbiting scroll 7, In this embodiment, the width of the back pressure chamber 16 is narrowed so that the orbiting scroll back side hole 26 and the back pressure chamber 16 are intermittently moved by the revolving motion of the orbiting scroll 7. To communicate with each other. Accordingly, with the revolution of the orbiting scroll 7, the position where the orbiting scroll fixed scroll side hole 37 and the fixed end plate hole 27 constituting the lubricating oil supply path communicate with each other, the orbiting scroll back side hole 26 and the back pressure chamber 16 are set. It is possible to intermittently switch the communication position.

FIG. 4 is a cross-sectional view of the compressor 100 of the present embodiment. The difference from the reference example described above is that the radial width of the back pressure chamber 16 is narrow and the orbiting scroll side hole 38 is large.

  The orbiting scroll back side hole 26 does not always communicate with the back pressure chamber 16 but intermittently communicates with the revolution movement of the orbiting scroll 7.

  That is, the flow rate control means 25 communicates the orbiting scroll fixed scroll side hole 37 with the fixed end plate hole 27 that forms the lubricating oil supply path, and the position that communicates the orbiting scroll back side hole 26 with the back pressure chamber 16. And switching intermittently.

  In addition, the orbiting scroll fixed scroll side hole 37 and the orbiting scroll side surface side hole 38 which is a communicating portion of the orbiting scroll back side hole 26 are enlarged, so that the orbiting scroll 7 revolves and the orbiting scroll fixed scroll side When the hole 37 and the fixed end plate part hole 27 come to communicate with each other, the high-pressure lubricant flowing into the orbiting scroll fixed scroll side hole 37 from the fixed end plate part hole 27 enters the inside of the orbiting scroll side surface hole 38. Inflow and store.

  When the orbiting scroll 7 is further revolved to reach a position where the orbiting scroll back side hole 26 and the back pressure chamber 16 communicate with each other, the high-pressure lubricant stored in the orbiting scroll side surface side hole 38 is When exposed to the low pressure atmosphere of the back pressure chamber 16 maintained at an intermediate pressure by the pressure control valve 36, the refrigerant dissolved in the lubricating oil is vaporized and falls into a forming state, thereby making the apparent appearance of the lubricating oil. The volume increases and flows into the back pressure chamber 16 from the orbiting scroll back side hole 26. That is, the orbiting scroll side surface hole 38 functions as a small amount reservoir for accumulating high-pressure lubricating oil.

  Next, the effect of this embodiment will be described. According to this embodiment, high-pressure lubricating oil from the fixed end plate portion hole 27 (in a high-pressure atmosphere) is temporarily stored in the orbiting scroll side surface hole 38 using the revolving motion of the orbiting scroll 7 and then the orbiting scroll. The back side hole 26 communicates with the back pressure chamber 16 (under a low pressure atmosphere). That is, every time the orbiting scroll 7 revolves, the amount of lubricating oil stored in the orbiting scroll side surface hole 38 can be supplied to the back pressure chamber 16, and the size of the orbiting scroll side surface hole 38 can be adjusted. The amount of lubricating oil supplied to the back pressure chamber 16 can be adjusted every time the orbiting scroll 7 revolves.

(Other embodiments)
In the above embodiment, the high-pressure lubricating oil in which the refrigerant is dissolved is passed through the lubricating oil supply path 39. However, the present invention is not limited to this, and the supply path is changed from the discharge pressure in accordance with the revolution of the orbiting scroll 7. However, it is only necessary to intermittently communicate with the low pressure portion, and only the lubricating oil may be passed through the supply path.

  Further, in the above embodiment, the orbiting scroll fixed scroll side hole 37 and the orbiting scroll back side hole 26 are formed at positions shifted in the radial direction and communicated by the orbiting scroll side surface hole 38. However, the orbiting scroll fixed scroll side hole 37 and the orbiting scroll back side hole 26 may be directly communicated with each other, and the orbiting scroll side surface side hole 38 may be eliminated.

  Moreover, in the said embodiment, although the back pressure chamber 16 was mentioned as an example as a site | part which is low pressure rather than discharge gas, this invention is not limited to this, If it is low pressure than discharge pressure, a compressor Any part in 100 may be sufficient.

It is sectional drawing of the compressor 100 in a reference example . It is sectional drawing which shows the structure of the flow control means 25 in a reference example . It is a schematic diagram which shows the action | operation of the flow control means 25 in a reference example . It is sectional drawing of the compressor 100 in embodiment of this invention . It is sectional drawing which shows the structure of the flow control means 25 in embodiment of this invention .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Compressor, 3 ... Rotating shaft, 6 ... Middle housing, 7 ... Revolving scroll, 8 ... Fixed scroll, 10 ... Block, 15 ... Revolving end plate part, 16 ... Back pressure chamber, 17 ... Revolving blade part, 19 ... Fixed end plate part 19 ... Fixed blade part, 25 ... Flow rate control means, 26 ... Orbiting scroll back side hole, 27 ... Fixed end plate part hole, 33 ... Block hole, 34 ... Restriction, 35 ... Back pressure chamber seal ring, 37 ... orbiting scroll fixed scroll side hole, 38 ... orbiting scroll side surface hole, 39 ... lubricating oil supply path route.

Claims (5)

A fixed scroll (8) fixed to a housing (4) having a rotating shaft (3) therein;
A revolving scroll (7) that revolves with the rotation of the rotating shaft (3) and compresses the refrigerant by meshing with the fixed scroll (8);
Supply path (39) for supplying lubricating oil separated from the refrigerant compressed by the fixed scroll (8) and the orbiting scroll (7) to a part (16) having a pressure lower than the discharge pressure of the compressed refrigerant. )When,
A scroll compressor having flow rate control means (25) for controlling the amount of the lubricating oil flowing through the supply path (39),
The flow rate control means (25) includes a turning scroll fixed scroll side hole (37) provided on one end surface of the turning scroll (7) on the fixed scroll (8) side, and the turning scroll (7). The orbiting scroll fixed scroll side hole (37) and the orbiting scroll back side hole (26) communicating with the inside of the orbiting scroll (7) are provided on the other end surface opposite to the fixed scroll (8). ,
The flow rate control means (25) has a position where the orbiting scroll fixed scroll side hole (37) and the supply path (39) communicate with each other, and the orbiting scroll back side hole (26) and a discharge pressure lower than the discharge pressure. A scroll compressor characterized by intermittently switching a position where a certain part (16) communicates with the revolution of the orbiting scroll (7). The orbiting scroll fixed scroll side hole and (37) the the orbiting scroll back side hole (26) Noto communication unit according to claim 1, characterized in that the reservoir for storing the lubricating oil (38) is provided The scroll compressor described in 1. The scroll type compression according to claim 1 or 2 , wherein the part (16) having a pressure lower than the discharge pressure is a back pressure chamber (16) provided on a back surface of the orbiting scroll (7). Machine. The scroll compressor according to claim 3 , wherein the back pressure chamber (16) is provided in an annular shape. The scroll compressor according to any one of claims 1 to 4 , wherein a carbon dioxide refrigerant is compressed by the fixed scroll (8) and the orbiting scroll (7).