JP4104047B2 - Scroll compressor - Google Patents

Description

[0001]
In the present invention, the fixed scroll and the orbiting scroll are meshed to form a compression space between the two, and the compression space is moved by the circular orbital motion of the orbiting scroll while the volume is reduced from the outer peripheral portion to the center portion, for example. Scroll compression that repeatedly draws, compresses and discharges fluid In machine It is related.
[0002]
[Prior art]
A conventional scroll compressor of this type generally has a configuration as shown in FIG. In this configuration, the fixed scroll 1 and the orbiting scroll 2 are meshed to form a plurality of compression spaces 3 therebetween. The orbiting scroll 2 is driven by the eccentric portion 9 of the crankshaft 8 via the orbiting bearing 7 in a state where the orbiting scroll 2 is prevented from rotating by the rotation preventing member 4 and is caused to perform a circular orbit motion, that is, orbiting motion with respect to the fixed scroll 1. By reducing the volume while the compression space 3 moves from the outer peripheral side toward the center of the spiral by the orbiting motion of the orbiting scroll 2, the refrigerant gas or the like is sucked from the inlet and compressed, and then compressed through the outlet 11. Discharge into the internal space 13 of the sealed container 12. Here, in the scroll compressor, the fixed scroll 1 and the orbiting scroll 2 described above are the main components, and the compression mechanism unit 14 is configured.
[0003]
The drive mechanism of the compression mechanism unit 14 includes a stator 18 fixed inside the hermetic container 12 and an electric motor 17 including a rotor 19 supported rotatably inside the stator 18. The crankshaft 8 is coupled to the rotor 19 in a penetrating manner, and the upper end portion of the crankshaft 8 is rotatably supported by a main bearing member 21 via a bearing 20. The distal end portion of the crankshaft 8 is provided with the eccentric portion 9 that performs an eccentric motion relative thereto. The lower end portion of the crankshaft 8 includes a positive displacement pump 22 and is rotatably supported by a support member 24 fixed to the sealed container 12 via a ball bearing 23.
[0004]
Lubricating oil (not shown) such as oil stored in the liquid reservoir 25 at the lower end of the hermetic container 12 is formed in the axial direction at the center of the crankshaft 8 by driving the positive displacement pump 22. The slewing bearing 7 is sucked up from the supply passage 27 and lubricates and cools, circulates through the bearing 20 through the liquid reservoir 28 and the liquid reservoir space 29 above the eccentric portion 9, and then returns to the liquid reservoir 25. Recirculated through the path. On the other hand, a part of the lubricating oil supplied to the liquid pool portion 28 is supplied to the back pressure chamber 32 while being decompressed by the throttle portion 31 via the long hole 30 provided inside the orbiting scroll 2. The back pressure chamber 32 is a space surrounded by the orbiting end plate 33 of the orbiting scroll 2, the recess 34 of the main bearing member 21, the upper surface portion 55 of the fixed scroll 1, and the seal member 38. A back pressure is applied so that the orbiting scroll 2 is pressed against the fixed scroll 1 by fluid pressure so as not to be separated from the fixed scroll 1. The seal member 38 performs a seal between the liquid pool space 29 which is a high pressure portion maintained at the discharge pressure and the back pressure chamber 32.
[0005]
Further, the lubricating oil supplied to the back pressure chamber 32 lubricates the rotation prevention member 4. The back pressure chamber 32 needs to always have a back pressure sufficient to prevent the orbiting scroll 2 from being pulled away from the fixed scroll 1. However, when the back pressure becomes excessive, the orbiting scroll 2 is strongly pressed against the fixed scroll 1, leading to abnormal wear of the scroll sliding portion and an increase in input. For this reason, it is necessary to always keep the back pressure constant. Therefore, the back pressure rises as the lubricating oil accumulates in the back pressure chamber 32, but when the pressure rises higher than the set value, the pressure adjustment mechanism 39 is activated, and the lubricating oil in the back pressure chamber 32 flows from the suction passage 40. It is guided to the compression space 3. That is, the pressure is released from the back pressure chamber 32. Thereby, the back pressure is always maintained at a constant value. The lubricating oil introduced into the compressed space 3 and released is provided with a sealing function for preventing leakage of refrigerant gas during compression and a function for lubricating the contact surface between the fixed scroll 1 and the orbiting scroll 2.
[0006]
As shown in FIG. 15, the throttle portion 31 is a pin-like member having a screw portion 31a on a part of the outer peripheral surface, and has a pore 31b at the center for generating a throttle effect. Accordingly, the lubricating oil in the liquid reservoir portion 28 in FIG. 14 is decompressed by the throttling effect when the flow rate is throttled through the pores 31b of the throttling portion 31, and then the back pressure chamber by an appropriate amount through the large holes 13c. 32 will be supplied. The appropriate amount of the lubricating oil is adjusted by setting the diameter of the pores 31b.
[0007]
On the other hand, as another conventional scroll compressor, one having a configuration as shown in the sectional view of FIG. 16 is known (see Japanese Patent Laid-Open No. 7-77182). In this scroll compressor, the valve opens when the back pressure chamber back pressure exceeds a certain value, and the excess pressure is released to the suction side of the compression mechanism section 14 to be used for lubrication in the compression mechanism section 14. Is adopted. That is, the lubricating oil 41 in the liquid reservoir 25 at the lower part of the hermetic container 12 is supplied to the main bearing member 21, the swivel bearing 7 and other sliding portions by the differential pressure between the pressure in the intermediate pressure chamber 42 and the discharge pressure. . The intermediate pressure chamber 42 is maintained at a pressure intermediate between the suction pressure and the discharge pressure by providing two intermediate holes (not shown) communicating with the compression space 3 in the base plate of the orbiting scroll 2. Lubricating oil 41 is supplied to the slewing bearing 7 and the main bearing member 21 through the liquid supply passage 27 of the crankshaft 8 and the oil supply groove 43 acting as a throttle portion due to the pressure difference. Furthermore, after the lubricating oil 41 that has entered the intermediate pressure chamber 42 is supplied to the compression space 3 from the intermediate pressure hole of the orbiting scroll 2 or the outer peripheral portion of the base plate, the space in the sealed container 12 together with the refrigerant gas from the discharge port 11 To be released.
[0008]
As shown in FIGS. 17 and 18, a check valve 45 is provided in the suction passage 44 of the compression mechanism portion 14 so as to be opened and closed corresponding to its operation and operation stop. When the compressor is operated, the refrigerant gas from the external cycle enters the suction passage 44, and the check valve 45 is pushed down from the position shown in FIG. 17 to the position shown in FIG. 18 by the suction gas pressure. A space communicating with the compression space 3 is formed. Thereby, the suction gas is sucked into the compression space 3 from the space. Further, the compressed refrigerant gas is discharged from the discharge port 11 of FIG. 16 to the inner space of the sealed container 12, and the discharged high-pressure gas is provided from the upper space of the sealed container 12 to the outer peripheral portion of the compression mechanism section. It passes through the notch or the communication hole, and is supplied to a lower space that houses the electric motor 17 and the like. At this time, the refrigerant gas cools the stator 18 of the electric motor 17, and further passes through a space such as the electric motor 17 to separate the lubricating oil discharged in the form of mist from the discharge port 11. Is returned from the discharge passage 47 to the external cycle.
[0009]
When the operation of the compressor is stopped, the check valve 45 causes the high-pressure refrigerant gas that is in the process of returning to the external cycle from the compression space 3, the sealed container 12, and the discharge passage 47 to flow backward from the suction passage 44 to the upstream side. And the spring 48 provided at the lower stage of the check valve 45 is pushed back from the position shown in FIG. 18 to the position shown in FIG. 17, so that the end face of the seal collar 49 and the flat surface of the check valve 45 Is closed to prevent the reverse flow of the refrigerant, and the lubricating oil 41 at the bottom of the compressor is the oil supply path 27 of the crankshaft 8, which is the oil supply path to the sliding portion, the slewing bearing 7, the main bearing member 21, and the intermediate It is prevented from being taken out of the compressor through the pressure chamber 42, the intermediate pressure hole, the compression space 3, and the like.
[0010]
[Problems to be solved by the invention]
However, in the scroll compressor of FIG. 14, if the diameter of the pore 31b is reduced or the length of the pore 31b is increased for the purpose of enhancing the drawing effect by the drawing portion 31, it is mixed in the lubricating oil. As a result, the pores 31b are easily blocked by dust and the like, and the performance of the compressor is deteriorated. Moreover, if the pores 31b are set to have a small diameter or a long length, the processing becomes difficult and the manufacturing cost is high. Further, in the above compressor, the lubricating oil is supplied to the liquid reservoir 25 using the positive displacement pump 22, so that the cost increases due to an increase in the number of parts and the number of assembly steps.
[0011]
On the other hand, since the scroll compressor of FIG. 16 does not use a positive displacement pump, there is an advantage that the structure can be simplified and the cost can be reduced, but a check valve 45 is provided for the purpose of obtaining high reliability. If there is a lot of leakage on the sealing surface of the check valve, the gas flows backward, and at that time, the lubricating oil 41 is taken out and the lubricating oil 41 for lubrication is insufficient, and the reliability is lowered. Remains. Further, in the above compressor, there remains a problem that the check valve 45 becomes a gas suction resistance during normal operation and the performance deteriorates.
[0012]
Therefore, the present invention has been made in view of the above conventional problems, and is simple and low-cost. Conversion Scroll compression that achieves high efficiency and high reliability while achieving Machine It is intended to provide.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, a fixed scroll whose blades rise from an end plate and a turning scroll are engaged with each other to form a compression space therebetween, and the turning scroll has a circular orbit with respect to the fixed scroll. Formed inside the shaft that drives the orbiting scroll in a scroll compressor having a compression mechanism that sucks, compresses and discharges fluid by reducing the volume while moving the compression space by being moved. A liquid supply passage that is connected to a liquid pool space maintained at a discharge pressure via a lubricating oil supply system in the compression mechanism section, and a communication hole in which the liquid supply path opens on the outer surface of the shaft on the liquid reservoir section side; An inflow hole that is provided in a bearing body that supports the shaft in the liquid reservoir so as to open to the liquid reservoir and intermittently communicates with the communication hole as the shaft rotates. A back pressure chamber provided on the back portion of the orbiting scroll in a state of being pressure-blocked with respect to the liquid pool space, and acting on a back pressure that presses the orbiting scroll toward the fixed scroll side, and one end opening is the back pressure. A throttle hole provided in the orbiting scroll in a state communicating with the chamber, and having an opening at the other end intermittently communicating with the liquid pool space by driving of the orbiting scroll.
[0014]
In this scroll compressor, the shaft is driven so that the compression mechanism works, and the liquid in the liquid reservoir is supplied to the lubricating oil supply system in the compression mechanism through the liquid supply passage inside the shaft, and then maintained at the discharge pressure. The liquid reaches the liquid pool space, and is further depressurized through the throttle hole and supplied to the back pressure chamber. The back pressure is applied to the orbiting scroll and pressed to the fixed scroll side. At this time, a set of communication holes and flow holes in the portion where the liquid supply passage communicates with the liquid reservoir, and a set of the liquid reservoir space and the other end opening of the throttle hole, intermittent communication associated with rotation of the respective shafts. Thus, the supply amount of the lubricating oil is adjusted, so that the proper amount of the lubricating oil according to the operation state can be accurately supplied and the back pressure can be maintained in the appropriate range, so that the efficiency is high. Further, even if the throttle hole is not formed in the fine hole, the supply amount of the lubricating oil is suppressed to a necessary level by a combination of two intermittent communication states in the liquid supply path from the liquid reservoir to the back pressure chamber. Therefore, clogging does not occur, high reliability can be obtained, and drilling is not difficult, so there is no cost increase. Further, since the lubricating oil can be prevented from being taken out of the compression mechanism when the operation is stopped without providing a check valve, the reliability is further improved. In addition, the check valve does not become a gas suction resistance during normal operation and has high efficiency.
[0015]
In the above invention, it is preferable that a single or a plurality of sets of communication holes and inflow holes are formed in the shaft and the bearing body so as to individually match the communication state by driving the orbiting scroll. In both the singular set and the multiple sets, the combination of the liquid reservoir space and the intermittent communication in the set of the other end opening of the throttle hole makes it easy to finely adjust the control of the supply amount of the lubricating oil, and there are multiple sets. It is easy to make fine adjustments and make accurate adjustments easily.
[0016]
According to a second aspect of the present invention, the fixed scroll whose blades rise from the end plate and the orbiting scroll are meshed with each other to form a compression space therebetween, and the orbiting scroll is circularly orbitally moved with respect to the fixed scroll. In the scroll compressor provided with a compression mechanism for sucking, compressing and discharging fluid by reducing the volume while moving, the discharge compressor is formed inside the shaft for driving the orbiting scroll and maintained at the discharge pressure. A liquid supply passage that communicates with the liquid reservoir space via a lubricating oil supply system in the compression mechanism, a communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side, and the shaft in the liquid reservoir. An inflow hole that is provided in the bearing body that is supported by the bearing so as to open to the liquid reservoir, and intermittently communicates with the communication hole as the shaft rotates, and pressure is applied to the liquid reservoir space. A back pressure chamber that is provided on a back portion of the orbiting scroll in a cut-off state and applies a back pressure that presses the orbiting scroll toward the fixed scroll side, and the orbiting in a state where one end opening communicates with the liquid pool space. A throttle hole is provided on the scroll, and the other end opening is intermittently communicated with the back pressure chamber by driving the orbiting scroll.
[0017]
In this scroll compressor, the supply amount of the lubricating oil to the back pressure chamber is adjusted by the intermittent communication between the throttle hole and the liquid pool space in the first invention, whereas the intermittent relationship between the throttle hole and the back pressure chamber is established. The same function as that of the first invention can be obtained and the same effect as that of the first invention can be obtained only by adjusting the supply amount of the lubricating oil to the back pressure chamber by general communication. .
[0018]
In the above invention, it is preferable that a single set or a plurality of sets of communication holes and inflow holes are formed in the shaft and the bearing body so as to individually match the communication state by driving the orbiting scroll. This makes it easy to finely adjust the control of the supply amount of the lubricating oil by combining the liquid reservoir space and the intermittent communication at the other end opening of the throttle hole in both the single set and the multiple sets. If it is a set, it is easier to make fine adjustments and accurate adjustments can be made easily.
[0019]
According to a third aspect of the present invention, the fixed scroll whose blades rise from the end plate and the orbiting scroll are engaged with each other to form a compression space therebetween, and the orbiting scroll is circularly orbitally moved with respect to the fixed scroll. In the scroll compressor provided with a compression mechanism for sucking, compressing and discharging fluid by reducing the volume while moving, the discharge compressor is formed inside the shaft for driving the orbiting scroll and maintained at the discharge pressure. A liquid supply passage that communicates with the liquid reservoir space via a lubricating oil supply system in the compression mechanism, a communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side, and the shaft in the liquid reservoir. An inflow hole that is provided in the bearing body that is supported by the bearing so as to open to the liquid reservoir, and intermittently communicates with the communication hole as the shaft rotates, and pressure is applied to the liquid reservoir space. In blocking state is provided in the back of the orbiting scroll, a back pressure chamber for applying a back pressure for pressing the orbiting scroll to the fixed scroll side is opened so as to communicate at all times in the back pressure chamber side Uh A recess formed in the fixed scroll is provided in the orbiting scroll in a state where one end opening communicates with the liquid storage space, and the other end opening communicates intermittently with the recess by driving the orbiting scroll. And a throttle hole.
[0020]
In this scroll compressor, the supply amount of the lubricating oil to the back pressure chamber is adjusted by intermittent communication between the throttle hole and the liquid pool space in the first invention, whereas the intermittent compression between the throttle hole and the recess is performed. The function equivalent to that of the first invention can be obtained and the same effect as that of the first invention can be obtained only by adjusting the supply amount of the lubricating oil to the back pressure chamber through the recess by the smooth communication. be able to.
[0021]
In the above invention, it is preferable that a single set or a plurality of sets of communication holes and inflow holes are formed in the shaft and the bearing body so as to individually match the communication state by driving the orbiting scroll. This makes it easy to finely adjust the control of the supply amount of the lubricating oil by combining the liquid reservoir space and the intermittent communication at the other end opening of the throttle hole in both the single set and the multiple sets. If it is a set, it is easier to make fine adjustments and accurate adjustments can be made easily.
[0028]
First 4 In this invention, the fixed scroll whose blades rise from the end plate and the orbiting scroll are engaged with each other to form a compression space therebetween, and the orbiting scroll is moved in a circular orbit with respect to the fixed scroll. In the scroll compressor having a compression mechanism that sucks, compresses and discharges the fluid by reducing the volume, the back is provided on the back of the orbiting scroll and presses the orbiting scroll toward the fixed scroll. Lubricating oil in the throttle part and the compression mechanism part formed in the back pressure chamber for applying pressure and the back pressure chamber formed inside the shaft for driving the orbiting scroll and maintained at a pressure between the discharge pressure and the suction pressure A liquid supply passage that communicates with the supply system, a communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side, and the liquid reservoir in the liquid reservoir An inflow hole intermittently communicating with the communication hole as the shaft rotates, a pressure adjusting mechanism for releasing excess pressure and maintaining the back pressure at a constant value, and A scroll compressor comprising: an inlet hole of the pressure adjusting mechanism that intermittently communicates with the back pressure chamber as it rotates.
[0029]
In this scroll compressor, the fourth invention adjusts the back pressure by adjusting the amount of lubricating oil supplied to the back pressure chamber by intermittently communicating the throttle valve and the liquid pool space with each other. A function equivalent to that of the fourth invention is achieved except that the back pressure is adjusted by adjusting the escape amount of the lubricating oil from the back pressure chamber by intermittent communication between the inlet hole of the mechanism and the back pressure chamber. In addition, since it is not necessary to provide a throttling hole in the supply path to the back pressure chamber, the same effect as the fourth invention can be obtained at a lower cost. Of course, a configuration in which a throttle hole is used together is also possible.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Several preferred embodiments of the present invention will be described below with reference to FIGS. In any of the embodiments, the case where the present invention is applied to a hermetic scroll compressor used for air conditioning and refrigeration equipment is illustrated. Therefore, the fluid to be handled is a refrigerant, and will be described below as a refrigerant. However, the present invention is not limited to this. In order to clarify the difference between the scroll compressor of these embodiments and the conventional scroll compressor shown in FIGS. 14 and 16, the same or functionally equivalent ones as in FIGS. Are given the same reference numerals.
[0037]
First, a driving method of a scroll compressor according to one embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1, 5, 6, 8, 11, and 13, the fixed scroll 1 and the orbiting scroll 2 are engaged with the fixed scroll 1 and the orbiting scroll 2 with the blades 50 and 51 rising from the orbiting endplate 33. A volume that accompanies movement of the compression space 3 from, for example, the outer peripheral side to the center when the orbiting scroll 2 is circularly orbitally moved with respect to the fixed scroll 1 by forming the compression space 3 to form the compression mechanism portion 14. This causes the fluid to be sucked and compressed through the suction port 10 and discharged through the discharge port 11.
[0038]
At the same time, the lubricating oil 101 such as oil, which is an example of liquid stored in the crankshaft 8 which is an example of the shaft that drives the orbiting scroll 2 on one end side, is stored in the reservoir 25 on the other end side. The lubricant is supplied to the lubricating oil supply system 102 in the compression mechanism portion 14 on the one end side to lubricate various sliding portions of the compression mechanism portion 14. Further, the lubricating oil 101 after the lubrication is supplied to the back portion of the orbiting scroll 2 through or without the liquid pool space 29 maintained at the discharge pressure, and the orbiting scroll 2 is pressed to the fixed scroll 1 side. The back pressure is applied so that the orbiting scroll 2 is stably turned and the escape from the fixed scroll 1 is prevented.
[0039]
In such a drive state of the scroll compressor, in particular, for example, back pressure as a back pressure action region that applies back pressure to the orbiting scroll 2 from the liquid reservoir 25 through the crankshaft 8 and through the liquid reservoir space 29. Due to intermittent communication associated with rotation of the crankshaft 8 at two locations in the supply path 100 of all the lubricating oil 101 that has already been described and that has not yet been reached, or the excess of the back pressure chamber 32. Back pressure, that is, the intermittent communication and supply path associated with the rotation of the crankshaft 8 at one position of the escape path 103 of the lubricant 101 for operating the pressure adjustment mechanism 39 that releases the lubricant 101 and adjusts the back pressure. By adjusting the supply amount or escape amount of the lubricating oil 101 to the back pressure chamber 32 by intermittent communication accompanying the rotation of the crankshaft 8 at one place in 100. Driving while maintaining the Kise圧 a predetermined range.
[0040]
In this way, in addition to normal suction, compression, and discharge in the compression mechanism unit 14, the compression mechanism unit 14 is connected to the liquid storage unit 25 on the other end side through the crankshaft 8 that drives the orbiting scroll 2 on one end side. The stored lubricating oil 101 is supplied and lubricated, and the lubricated lubricating oil 101 is supplied to the back pressure chamber 32 at the back of the orbiting scroll 2 through the liquid reservoir space 29 maintained at the discharge pressure and swirled. Since the back pressure that presses the scroll 2 toward the fixed scroll 1 is applied, the orbiting scroll 2 can be driven to rotate smoothly and stably without escape from the fixed scroll 1.
[0041]
In particular, the back pressure chamber 32 is adjusted to adjust the back pressure by adjusting one of the supply amount and the relief amount of the lubricating oil 101 that exerts the back pressure, or to easily adjust the back pressure by adjusting both. For intermittent communication at two points in the supply path 100 or intermittent communication at one position in the escape path 103 from the back pressure chamber 32 and rotation of the crankshaft 8 at one position in the supply path 100 With intermittent communication, liquid supply to the back pressure chamber 32 is achieved by a combination of intermittent liquid supply to the back pressure chamber 32 at two locations using the supply path 100 and the escape path 103 or a combination of the relief. More precise and minute adjustments of the amount or escape amount can be made while ensuring the exact cycle and timing associated with the rotation of the crankshaft 8, and there is no special drive mechanism or control mechanism. Or and properly set and maintain the back pressure required for each operating condition, it is possible to improve the performance and reliability of the scroll compressor.
[0042]
The supply of the lubricating oil 101 to the back pressure chamber 32 is performed through the supply path 100 through at least the crankshaft 8 and the orbiting scroll 2, and the intermittent supply or release of the lubricating oil 101 is supplied to the liquid reservoir 25. Between the bearing body 52 that receives the crankshaft 8 and the crankshaft 8, the orbiting scroll 2 and the fixed scroll 1 or the compression mechanism 14 side of the crankshaft 8 are supported and the orbiting scroll 2 is on the anti-fixed scroll 1 side. Can be performed by intermittent communication of the supply path 100 in at least one of the relative moving parts between one or both of the main bearing members 21 which are examples of the supporting members supported by Both are realized using existing mechanisms and members.
[0043]
Further, the orbiting scroll 2 and / or the main bearing so that the intermittent communication of the supply path 100 between the orbiting scroll 2 and the fixed scroll 1 or the main bearing member 21 is always communicated with the back pressure chamber 32. If the supply path 100 between the recess 60 formed in the member 21 as shown in FIG. 6 and the orbiting scroll 2 is intermittently communicated, the circular orbit of the orbiting scroll 2 depends on the size and shape of the recess 60. When setting the opening position and the size of the supply path 100 for intermittent communication with the supply path 100 on the side of the orbiting scroll 2 while ensuring escape to movement, that is, constant communication to the back pressure chamber 32. Increase the degree of freedom.
[0044]
Further, intermittent communication of the supply path 100 is performed in parallel with a plurality of parallel inflow holes 53 and 54 and communication holes 57 and 58 shown in FIG. 1 of the supply path 100 in at least one place in the relative movement section. If it is carried out independently at this point, it becomes easier to finely and finely adjust the liquid supply state by a combination of independent communication states at a plurality of parallel places.
[0045]
The advantages of the recess 60 and the communication state at a plurality of parallel locations can be obtained by applying the same effect to the escape path 103 of the lubricating oil 101.
[0046]
Next, scroll compressors according to some embodiments employing the above driving method will be described. The scroll compressor according to the embodiment shown in FIGS. 1 to 3 includes a fixed scroll 1 and a rotary scroll 2 having blades 50 and 51 rising from the fixed end plate 37 and the revolving end plate 33 as shown in FIG. A plurality of compression spaces 3 are formed between the fixed scroll 1 and the orbiting scroll 2 by meshing. The orbiting scroll 2 is prevented from rotating by an anti-rotation member 4 such as an Oldham ring or a mechanical anti-rotation mechanism, and is attached to the eccentric portion 9 of the crankshaft 8 via, for example, an orbiting bearing 7 fitted to the orbiting scroll 2. As a result, a circular orbital motion, that is, a turning motion is performed with respect to the fixed scroll 1. The volume of the compression space 3 decreases as the orbiting scroll 2 moves, for example, from the outer peripheral side toward the center of the spiral. As a result, in the compressor, the refrigerant gas or the like is sucked from the suction port 10 and compressed, and then discharged through the discharge port 11 into the internal space 13 of the sealed container 12. Here, in the scroll compressor according to the present embodiment, the above-described fixed scroll 1 and orbiting scroll 2 constitute the compression mechanism unit 14.
[0047]
The drive mechanism of the compression mechanism unit 14 includes a stator 18 fixed inside the hermetic container 12 and an electric motor 17 including a rotor 19 supported rotatably inside the stator 18. The crankshaft 8 is coupled to the rotor 19 in a penetrating manner, and the upper end portion of the crankshaft 8 is rotatably supported by a main bearing member 21 via a bearing 20. The distal end portion of the crankshaft 8 is provided with the eccentric portion 9 that performs an eccentric motion relative thereto. A support member 24 is fixed to the lower end of the sealed container 12, and the lower end of the crankshaft 8 is rotatably supported by a bearing body 52 held by the support member 24.
[0048]
As shown in FIGS. 3 (a) and 3 (b), the bearing body 52 is substantially cylindrical, and has a long hole shape along the circumferential direction at two locations spaced apart in the cylindrical direction and the circumferential direction. Inflow holes 53 and 54 are formed in parallel. On the other hand, in the portion of the crankshaft 8 supported by the bearing body 52, first and second communication holes 57, which communicate with the liquid supply passage 27 at two locations facing the inflow holes 53, 54 in the axial direction. 58 are perforated in parallel. The first and second communication holes 57 and 58 are matched with the inflow holes 53 and 54 once for each rotation of the crankshaft 8, and the liquid is passed through the matched communication holes 57 and 58 and the inflow holes 53 and 54. The supply passage 27 communicates with the liquid reservoir 25.
[0049]
The lubricating oil 101 stored in the liquid reservoir 25 at the lower end of the sealed container 12 is caused by the pressure difference between the internal space 13 of the sealed container 12 and the back pressure chamber 32 and the above-described communication holes 57 and 58 and the inflow. After being sucked up from the liquid supply passage 27 through the holes 53 and 54 to lubricate and cool the bearing 20, the lubrication and cooling of the slewing bearing 7 are performed. Further, the lubricating oil 101 enters the liquid storage space 29 from the liquid storage part 28 above the eccentric part 9, and then is supplied to the back pressure chamber 32 from the throttle hole 59 formed in the swivel end plate 33 through the long hole 30. Is done. The back pressure chamber 32 is a space surrounded by the orbiting end plate 33 of the orbiting scroll 2, the recess 34 of the main bearing member 21, the surface 55 of the fixed scroll 1, and the annular seal member 38. A back pressure is applied to the fixed scroll 1 so that the orbiting scroll 2 is not pulled away from the fixed scroll 1 by fluid pressure. The seal member 38 performs a seal between the liquid pool space 29 which is a high pressure portion maintained at the discharge pressure and the back pressure chamber 32.
[0050]
The lubricating oil 101 supplied to the back pressure chamber 32 lubricates the rotation prevention member 4. The back pressure in the back pressure chamber 32 must always be kept constant. However, the back pressure increases as the lubricating oil accumulates in the back pressure chamber 32. Therefore, when the back pressure rises above the set value, the pressure adjustment mechanism 39 is activated so that the lubricating oil 101 in the back pressure chamber 32 is released from the suction passage 40 to the compression space 3. Thus, the back pressure is always maintained at a constant value. The lubricating oil guided to the compression space 3 prevents leakage of refrigerant gas during compression and lubricates the contact surface between the fixed scroll 1 and the orbiting scroll 2.
[0051]
FIGS. 2A to 2D show the relationship between the throttle hole 59 and the seal member 38 when the swivel end plate 33 is viewed from the bottom. In FIG. 2, as is apparent from the orbiting positions (a) to (d) every 90 degrees of the orbiting scroll 2, the throttle hole 59 is provided with the liquid pool space 29 and the back pressure chamber 32 along with the orbiting movement of the orbiting scroll 2. A circular motion is performed across the seal member 38 between the two. Here, since the sealing member 38 seals between the liquid reservoir space 29 and the back pressure chamber 32 as described above, the throttle hole 59 which is a part of the supply path 100 is connected to the liquid reservoir space 29 and the back pressure chamber. A circular motion is performed while going back and forth between the chambers 32 across the seal member 38. For this purpose, the long hole 30 is bored from the outer peripheral portion of the orbiting scroll 2 to the middle position on the inner circumference side corresponding to the liquid pool space 29, and the throttle hole 59 reaching the liquid pool space 29 from this middle position on the inner circumference side. Are formed, and both are continuous in a bowl shape. However, any specific configuration may be employed as long as substantially the same action is possible. For example, the throttle hole 59 opens directly on the back surface of the swivel end plate 33, but is not limited to this, and the back pressure such as the middle of the long hole 30 extending from the liquid reservoir space 29 to the back pressure chamber 32 or the outer peripheral surface of the swivel end plate 33. It may be in a position that directly opens into the chamber 32.
[0052]
Only when the throttle hole 59 faces the liquid pool space 29, the liquid pool space 29 communicates with the back pressure chamber 32 intermittently, and the lubricating oil 101 in the liquid pool space 29 passes through the throttle hole 59 and the long hole 30. It is supplied to the back pressure chamber 32. On the other hand, when the throttle hole 59 faces the seal member 38 or the back pressure chamber 32, the communication is intermittently interrupted, and the lubricating oil is not supplied to the back pressure chamber 32. Therefore, the supply amount of the lubricating oil 101 to the back pressure chamber 32 can be adjusted by changing the time ratio at which the throttle hole 59 faces the liquid pool space 29 during one rotation.
[0053]
The throttle hole 59 of this embodiment can adjust the time ratio facing the liquid pool space 29 by variously changing the diameter of the locus when moving circularly by setting the formation position. In addition, there is no problem as in the case of reducing the diameter and increasing the length.
[0054]
On the other hand, as shown in FIG. 3, the first and second communication holes 57 and 58 of the crankshaft 8 intermittently match the inflow holes 53 and 54 of the bearing body 52 as the crankshaft 8 rotates. Sometimes it communicates with the liquid reservoir 25. Here, the time ratio at which the two communication holes 57, 58 provided on the same line in the axial direction communicate with the inflow holes 53, 54 is the length and formation along the circumferential direction of the inflow holes 53, 54. By changing the position, it can be individually set to a predetermined value, whereby the amount of lubricating oil flowing into the liquid supply passage 27 can be set to an appropriate value.
[0055]
Next, the relationship between the position of the throttle hole 59 and the two inflow holes 53 and 54 of the bearing body 52 and the two communication holes 57 and 58 of the crankshaft 8 will be described with reference to the explanatory view of FIG. The state where the throttle hole 59 faces the liquid pool space 29 is an intermittent communication section, and the state where the throttle hole 59 faces either the seal member 38 or the back pressure chamber 32 is an intermittent closing section. . In addition, the state where the communication holes 57 and 58 match the inflow holes 53 and 54 is an intermittent communication section, and the state where the communication holes 57 and 58 do not match the inflow holes 53 and 54 is an intermittent closing section. To do. While the crankshaft 8 makes one rotation, the first to third modes shown in FIG. 4 are generated by the combination of the communication section and the closing section.
[0056]
In the first mode, the liquid reservoir 25 communicates with the liquid reservoir space 29 via the inflow hole 53, the first communication hole 57, the liquid supply passage 27, and the throttle hole 59. The lubricating oil in the liquid reservoir 25 is supplied to the lubricating oil supply system by the differential pressure with the pressure chamber 32. In the second mode, since the liquid pool space 29 communicates with the back pressure chamber 32, the space pressure of the lubricating oil supply system including the liquid supply passage 27 and the liquid pool space 29 is the same as the back pressure of the back pressure chamber 32. Depressurize until the same. In this decompression process, the refrigerant dissolved in the lubricating oil in the lubricating oil supply system foams, and the refrigerant gas and the lubricating oil are supplied to the back pressure chamber 32 through the throttle hole 59.
[0057]
In the third mode, the lubricating oil 101 is supplied through the inflow hole 54 and the second communication hole 58 into the space of the lubricating oil supply system 102 including the liquid supply passage 27 and the liquid pool space 29 decompressed in the second mode. Is done. Therefore, in the scroll compressor of this embodiment, the lubricating oil 101 can be easily and accurately adjusted to an appropriate amount by setting the ratio of each of the first to third modes during one rotation of the crankshaft 8. Can be supplied.
[0058]
Next, the state when the compressor is stopped from the operating state will be described. When the operation of the crankshaft 8 is stopped in the first mode, the lubricating oil 101 in the liquid reservoir 25 is supplied from the inflow hole 53 and the first communication hole 57 to the throttle hole 59 through the liquid supply passage 27, Further, it is taken out of the compressor through the suction passage 40 and the like. However, when the lubricating oil 101 is taken out and the liquid level of the lubricating oil 101 in the liquid reservoir 25 decreases to the upper inflow hole 53 or lower, the refrigerant gas in the internal space 13 flows into the inflow hole 53 and the first communication hole. The liquid flows into the liquid supply passage 27 from 57. As a result, the lubricating oil 101 is no longer taken out of the compressor, and the liquid level of the liquid reservoir 25 can be secured at a position between the lower inflow hole 54. Thus, in this scroll compressor, it is possible to prevent the lubricating oil 101 from being taken out of the compressor without using a check valve.
[0059]
When the operation of the crankshaft 8 is stopped in the second mode, both the inflow holes 53 and 54 are closed, so that the lubricating oil 101 in the liquid reservoir 25 is supplied to the lubricating oil supply system 102 any more. Instead, the liquid level of the liquid reservoir 25 is maintained in the state when the operation is stopped. Further, when the operation of the crankshaft 8 is stopped in the third mode, the throttle hole 59 is closed, so that the lubricating oil 101 in the liquid reservoir 25 is not supplied to the lubricating oil supply system 102 any more, and the liquid The liquid level of the reservoir 25 is maintained in the state when the operation is stopped.
[0060]
On the other hand, when the operation of the crankshaft 8 is stopped in the first mode, the liquid level of the liquid reservoir 25 is below the upper inflow hole 53 and above the lower inflow hole 54. The oil supply state in the first to third modes when the is restarted is changed. That is, in the first mode, the refrigerant gas flowing into the liquid supply passage 27 from the internal space 13 through the inflow hole 53 and the first communication hole 57 due to the differential pressure between the internal space 13 and the back pressure chamber 32 is It is supplied together with the lubricating oil 101 existing in the space of the lubricating oil supply system 102. In the second mode, the pressure inside the lubricating oil supply system 102 including the liquid supply passage 27 and the liquid pool space 29 is reduced until it becomes the same as the back pressure of the back pressure chamber 32. In this decompression process, the refrigerant dissolved in the lubricating oil 101 in the lubricating oil supply system 102 is foamed, and the refrigerant gas and the lubricating oil 101 are supplied to the back pressure chamber 32 through the throttle hole 59.
[0061]
In the third mode, the lubricating oil is supplied through the inflow hole 54 and the second communication hole 58 into the space of the lubricating oil supply system 102 including the liquid supply passage 27 and the liquid pool space 29 decompressed in the second mode. The Therefore, in the scroll compressor of this embodiment, the lubricating oil can be adjusted and supplied to an appropriate amount by setting the ratio of each of the first to third modes during one rotation of the crankshaft 8.
[0062]
A scroll compressor according to another embodiment of the present invention shown in FIG. 5 will be described. . However, members that are the same as or equivalent to those of the scroll compressor shown in FIG. In the scroll compressor of this embodiment, the throttle hole 59 intermittently communicates with the liquid pool space 29 in the embodiment of FIG. 1 and supplies lubricating oil to the back pressure chamber 32 through the long hole 30. On the other hand, the throttle hole 59 communicates with the liquid reservoir portion 28 that is substantially unchanged from the liquid reservoir space 29 through the long hole 30, and intermittently communicates directly with the back pressure chamber 32. The lubricating oil 101 is supplied to the back pressure chamber 32 only when communicating with the engine 32.
[0063]
In order to do this, a long hole 30 is formed at one end so as to penetrate the orbiting scroll 2 from the liquid reservoir 28 to the outer periphery in the radial direction, and the liquid is discharged from a position corresponding to the liquid reservoir space 29 of the long hole 30. A throttle hole 59 reaching the pool space 29 is formed, and a portion connecting the throttle hole 59 of the long hole 30 to the back pressure chamber 32 side is blocked by the plug 104. However, any specific configuration may be employed as long as substantially the same action is obtained. For example, the long hole 30 may be communicated with the liquid pool space 29 while satisfying a position condition that does not communicate with the back pressure chamber 32. In this case as well, the throttle hole 59 may be provided at a position in the middle of the long hole 30 extending from the liquid reservoir 28 or the liquid reservoir space 29 to the back pressure chamber 32 or at a position opening to the liquid reservoir 28 or the liquid reservoir space 29.
[0064]
The operation of the throttle hole 59 in this embodiment will be described with reference to FIGS. 2 (a) to 2 (d) described above. As shown in FIGS. 1A to 1D, the throttle hole 59 is a seal member between the liquid reservoir space 29 and the back pressure chamber 32 by the circular orbital motion of the orbiting scroll 2 as in the embodiment of FIG. A circular motion is performed across 38 and the back pressure chamber 32 communicates intermittently. However, in the present embodiment, when the throttle hole 59 faces the seal member 38 or the liquid pool space 29, the lubricating oil 101 is not supplied to the back pressure chamber 32 because it does not communicate with the back pressure chamber 32. On the other hand, when the throttle hole 59 faces the back pressure chamber 32, the lubricating oil 101 in the liquid reservoir 28 is supplied to the back pressure chamber 32 through the long hole 30 and the throttle hole 59 without passing through the liquid reservoir space 29. Is done. Further, in the embodiment of FIG. 1, the lubricating oil 101 passes through the throttle hole 59 from below to above, whereas in the present embodiment, conversely, the lubricant oil 101 passes through the throttle hole 59 from above to below. .
[0065]
In the above, the supply amount of the lubricating oil to the back pressure chamber 32 can be adjusted by changing the time ratio at which the throttle hole 59 faces the back pressure chamber 32. In this case, the diameter of the throttle hole 59 can be adjusted by variously changing the diameter of the trajectory when the circular movement is performed by setting the formation position, so that the time ratio facing the back pressure chamber 32 can be adjusted. There is no inconvenience that occurs when the length is made smaller and the length is made longer.
[0066]
Further, the operation by the combination of the time ratio in which the throttle hole 59 faces the back pressure chamber 32 and the section in which the communication holes 57, 58 communicate with the inflow holes 53, 54 is as described in the embodiment of FIG. Thus, the same effect as described in the embodiment of FIG. 1 can be obtained.
[0067]
A scroll compressor according to another embodiment shown in FIG. 6 will be described. However, the same or equivalent components as those in the embodiment of FIG. The scroll compressor of this embodiment is formed in the recess 60 formed in the fixed end plate 37 and always communicating with the back pressure chamber 32 and the swivel end plate 33 instead of the throttle hole 59 in the embodiment of FIG. One end side communicates with the liquid reservoir 28 through the long hole 30, and the other end side is provided with a throttle hole 61 communicating intermittently with the recess 60.
[0068]
For this purpose, the recess 60 is provided corresponding to the outer peripheral portion of the turning end plate 33 of the fixed end plate 37 so as to face a predetermined position outside the maximum turning radius of the turning scroll 2 and outside the minimum turning radius. The opening is provided so as to be in a position facing the recess 60 for a predetermined period at a predetermined timing during the circular orbit movement of the orbiting scroll 2, that is, in a communicating position. The throttle hole 61 communicates with the liquid reservoir 28 through the long hole 30. The long hole 30 is provided so as to penetrate from the liquid reservoir 28 of the swivel end plate 33 to the outer periphery, and the middle is connected to the throttle hole 61 in a bowl shape. The opening of the long hole 30 to the back pressure chamber 32 is closed by a plug 104. Also in this case, the long hole 30 may be communicated with the liquid pool space 29 while satisfying a positional condition that does not communicate with the back pressure chamber 32. Further, the throttle hole 61 may be in the middle of the long hole 30 that reaches the recess 60 from the liquid reservoir 28 or at a position that opens to the liquid reservoir 28.
[0069]
1 and FIG. 5, the lubricating oil supply system 102 is configured such that the lubricating oil 101 that has passed through the bearing 20 reaches the liquid pool portion 28 and then reaches the liquid pool space 29 through the swivel bearing 7. On the other hand, in the lubricating oil supply system 102 according to the present embodiment, the lubricating oil 101 that has passed through the bearing 20 passes through the liquid pool space 29, passes through the swivel bearing 7, and reaches the liquid pool portion 28.
[0070]
7A to 7D show the relationship between the recess 60 and the aperture 61 when the swivel end plate 33 is viewed from the bottom. In FIG. 7, as is clear from the positions (a) to (d), the throttle hole 61 is provided with a recess 60 facing the orbiting scroll 2 of the fixed scroll 1 in accordance with the orbiting motion of the orbiting scroll 2. Circular motion is performed so as to face the surface 55 and the recess 60 alternately and intermittently. When the throttle hole 61 faces the recess 60, the lubricating oil in the liquid reservoir 28 is supplied from the recess 60 to the back pressure chamber 32 through the long hole 30 and the throttle hole 61. On the other hand, when the throttle hole 61 faces the surface 55, the throttle hole 61 is closed by the upper surface portion 55, and no lubricating oil is supplied. Therefore, in this scroll compressor, the amount of lubricating oil supplied to the back pressure chamber 32 is set by appropriately setting the time ratio during which the throttle hole 61 faces the recess 60 during one rotation of the crankshaft 8. Can be set appropriately.
[0071]
The operation by combining the time ratio in which the throttle hole 61 faces the recess 60 and the section in which the communication holes 57 and 58 communicate with the inflow holes 53 and 54 is as described in the embodiment of FIG. Thus, the same effect as described in the embodiment of FIG. 1 can be obtained. The recess 60 is not limited to a circle as shown in FIG.
[0072]
The scroll compressor according to the embodiment shown in FIGS. 8 and 9 will be described. However, members that are the same as or equivalent to those in the embodiment of FIG. In the embodiment of FIG. 1, two inflow holes 53 and 54 and two communication holes 57 and 58 are provided in parallel in the bearing body 52 and the crankshaft 8 respectively. The crankshaft 8 is provided with a single inflow hole 62 and a communication hole 63, respectively.
[0073]
Next, the relationship between the position of the throttle hole 59 and the relative positions of the inflow hole 62 of the bearing body 52 and the communication hole 63 of the crankshaft 8 will be described with reference to the explanatory view of FIG. Now, a state where the communication hole 63 faces the liquid pool space 29 is an intermittent communication section, and a state where the communication hole 63 faces either the seal member 38 or the back pressure chamber 32 is an intermittent closing section. . Further, a state where the communication hole 63 matches the inflow hole 62 is an intermittent communication section, and a state where the communication hole 63 does not match the inflow hole 62 is an intermittent closing section. While the crankshaft 8 makes one revolution, the first and second modes shown in FIG. 10 are generated by the combination of the communication section and the closing section described above.
[0074]
In the first mode, since the communication hole 63 is closed and the throttle hole 59 communicates with the liquid pool space 29, the spatial pressure of the lubricating oil supply system 102 including the liquid supply passage 27 and the liquid pool space 29 is The pressure is reduced until it becomes equal to the back pressure in the back pressure chamber 32. In this decompression process, the refrigerant dissolved in the lubricating oil 101 in the lubricating oil supply system 102 is foamed, and the refrigerant gas and the lubricating oil 101 are supplied to the back pressure chamber 32 through the throttle hole 59.
[0075]
In the second mode, the lubricating oil 101 is supplied through the inflow hole 62 and the communication hole 63 into the space of the lubricating oil supply system 102 including the liquid supply passage 27 decompressed in the first mode and the high-pressure liquid reservoir space 29. The Therefore, in the scroll compressor of this embodiment, the lubricating oil 101 is adjusted to an appropriate amount and supplied by setting the ratio of the first and second modes during one revolution of the crankshaft 8. Can do.
[0076]
Next, the state when the compressor is stopped from the operating state will be described. When the operation of the crankshaft 8 is stopped in the first mode, since the communication hole 63 is closed, the lubricating oil 101 in the liquid reservoir 25 is not supplied to the lubricating oil supply system 102, and the liquid reservoir 25 The liquid level is maintained in the state when the operation was stopped. Further, when the operation of the crankshaft 8 is stopped in the second mode, since the throttle hole 59 is closed, the lubricating oil 101 in the liquid reservoir 25 is not supplied to the lubricating oil supply system 102 and the liquid reservoir The liquid level of 25 is maintained in the state when the operation is stopped.
[0077]
In this scroll compressor, the adjustment of the supply amount of the lubricating oil 101 is slightly rough compared with the embodiment of FIG. 1, but the time of each of the first and second modes during one revolution of the crankshaft 8 is achieved. By appropriately setting the target ratio, the lubricating oil 101 can be adjusted to an appropriate amount and supplied.
[0078]
It should be noted that the throttle hole 59 intermittently communicates with the liquid pool space 29, and instead of supplying the lubricating oil to the back pressure chamber 32 through the long hole 30, the throttle hole 59 shown in the embodiment of FIG. However, it is possible to obtain the same effect as that of the present embodiment even if the configuration in which the oil is intermittently communicated with the back pressure chamber 32 and the lubricating oil is supplied to the back pressure chamber 32 through the long hole 30 is used. It is.
[0079]
It should be noted that the throttle hole 59 intermittently communicates with the liquid reservoir space 29, and instead of supplying the lubricating oil 101 to the back pressure chamber 32 through the long hole 30, the recess shown in the embodiment of FIG. Needless to say, the same effect as in the present embodiment can be obtained by combining the configuration in which 60 and the aperture 61 are provided.
[0080]
A scroll compressor according to the embodiment shown in FIG. 11 will be described. However, members that are the same as or equivalent to those of the embodiment of FIG. In the scroll compressor of this embodiment, in the embodiment of FIG. 8, a single inflow hole 62 and a communication hole 63 are provided in the bearing body 52 and the crankshaft 8, respectively, and the inlet hole 64 of the pressure adjusting mechanism 39 is the back. Whereas the communication hole 63 is provided in a state of being always in direct communication with the liquid reservoir 25 while being provided in communication with the pressure chamber 32, and the escape shaft 103 of the pressure adjusting mechanism 39 with respect to the lubricating oil 101, An inlet hole 64 that intermittently communicates with the back pressure chamber 32 is provided along with the rotation.
[0081]
Also, the lubricating oil supply system 102 of the present embodiment supplies the lubricating oil 101 that has been divided and supplied from the liquid supply passage 27 in the crankshaft 8 to the bearing 20 and the liquid reservoir 28, and has passed through the bearing 20 by lubrication. The lubricant 101 enters the liquid reservoir space 29 as it is, and the lubricating oil 101 that has entered the liquid reservoir 28 passes through the slewing bearing 7, lubricates it, and reaches the liquid reservoir space 29.
[0082]
FIGS. 12A to 12D show the relationship between the rotating mirror plate 33 and the inlet hole 64 when the rotating mirror plate 33 in the scroll compressor is viewed from the bottom. In FIG. 12, the inlet hole 64 intermittently communicates from the revolving end plate 33 to the back pressure chamber 32 as the revolving scroll 2 moves, as is apparent from the positions (a) to (d). When the inlet hole 64 faces the back pressure chamber 32, the lubricating oil 101 in the back pressure chamber 32 is released from the suction passage 40 to the suction region of the compression space 3 through the inlet hole 64 and the pressure adjustment mechanism 39. As a result, excessive back pressure is eliminated, and the lubricating oil 101 is supplied to the sliding portion between the fixed scroll 1 and the orbiting scroll 2. On the other hand, when the inlet hole 64 is closed by the swivel end plate 33, the lubricating oil 101 is not released and is not supplied to the sliding portion. Therefore, in this scroll compressor, the amount of lubricating oil supplied to the compression space 3 is set by appropriately setting the time ratio in which the inlet hole 64 faces the back pressure chamber 32 during one rotation of the crankshaft 8. Can be set appropriately.
[0083]
Further, the operation by the combination of the time ratio in which the inlet hole 64 of the compression mechanism portion 14 communicates with the back pressure chamber 32 and the time ratio in which the throttle hole 59 faces the back pressure chamber 32 is shown in FIG. Thus, the same effect as described in the embodiment of FIG. 8 can be obtained.
[0084]
The throttle hole 59 intermittently communicates with the liquid pool space 29, and instead of supplying the lubricating oil 101 to the back pressure chamber 32 through the long hole 30, the throttle hole shown in the embodiment of FIG. Even if the configuration in which 59 is intermittently communicated with the back pressure chamber 32 and the lubricating oil 101 is supplied to the back pressure chamber 32 through the long hole 30, the same effect as in the present embodiment can be obtained. Of course.
[0085]
The throttle hole 59 intermittently communicates with the liquid pool space 29, and instead of supplying the lubricating oil to the back pressure chamber 32 through the long hole 30, the recess 60 shown in the embodiment of FIG. Needless to say, the same effects as those of the present embodiment can be obtained by combining the configuration in which the aperture hole 61 is provided.
[0086]
A scroll compressor according to the embodiment shown in FIG. 13 will be described. However, members that are the same as or equivalent to those of the embodiment of FIG. In the embodiment of FIG. 11, the communication hole 63 is always in direct communication with the liquid reservoir 25, the throttle hole 59 is in intermittent communication with the liquid reservoir space 29, and the lubricating oil is supplied to the back pressure chamber 32 through the long hole 30. In contrast, the scroll compressor of the present embodiment is provided with a single inflow hole 62 and a communication hole 63 in the bearing body 52 and the crankshaft 8 respectively, and intermittently as the crankshaft 8 rotates. In addition, the back pressure chamber 32 and the liquid supply passage 27 in the crankshaft 8 are always in communication with each other via the lubricating oil supply system 102 and the throttle portion 65.
[0087]
The throttle portion 65 is formed in the middle or at the end using the lubricating oil supply system 102. Specifically, the bearing 20 is formed as a sliding bearing by utilizing a gap between the crankshaft 8 and the bearing 20 formed thereby. Further, a similar clearance in the slewing bearing 7 as a sliding bearing can be used, and both the bearings 20 and 7 can be narrowed down to two stages. Of course, you may utilize the clearance gap between parts other than a bearing part. As a result, since the depressurized lubricating oil 101 that has passed through the throttle 65 is supplied to the liquid reservoir space 29, it is not necessary to set a pressure difference with the back pressure chamber 32 or the orbiting scroll 2 and the main bearing member The decompression state necessary for the back pressure chamber 32 can be obtained only by using the squeezing effect at the sliding portion with 21. Therefore, the sealing member between the liquid pool space 29 and the back pressure chamber 32 is omitted. In the present embodiment, depending on the decompression effect set by the throttle portions 65 of the liquid reservoir 28, the liquid reservoir space 29, and the back pressure chamber 32, the pressures are almost the same, and each of them acts as a back pressure.
[0088]
Further, a combination of a time ratio in which the inlet hole 64 of the pressure adjustment mechanism 39 intermittently communicates with the back pressure chamber 32 and a time ratio in which the communication hole 63 intermittently matches and communicates with the inflow hole 62. The operation is as described in the embodiment of FIG. 8, and thereby, the same effect as described in the embodiment of FIG. 8 can be obtained. Further, by providing the throttle portion 65 in the lubricating oil supply system 102, it is not necessary to provide the throttle hole 59 and the seal member 38 as in the other embodiments, so that the cost of the embodiment of FIG. Similar effects can be obtained.
[0089]
【The invention's effect】
As described above, scroll compression of the present invention In machine According to the present invention, the liquid is supplied to the back pressure chamber by a combination of two intermittent communication states obtained using at least one of the liquid supply path to the back pressure chamber and the excess liquid escape path from the back pressure chamber. The back pressure in various ranges according to the model and operating conditions can be easily set by adjusting the amount of lubricating oil supplied, and the intermittent communication is a shaft that drives the orbiting scroll. Therefore, it is possible to supply an appropriate amount of lubricating oil according to the model and the operating condition at that time, and to have high efficiency.
[0090]
In addition, even if a throttle hole is used, the amount of lubricating oil supplied can be suppressed as required by the combination of the inflow hole and the communication hole, even if it is not formed in the small hole, so there is no clogging and high reliability. In addition, since a simple hole processing is sufficient, there is no cost increase. In addition, since it is possible to prevent the lubricating oil from being taken out of the compressor when the operation is stopped without providing a check valve, the reliability is further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention.
2 shows the relationship between the throttle hole and the seal member when the orbiting end plate is viewed from the bottom in the scroll compressor of FIG. Operation | movement explanatory drawing shown by a position.
3 is a perspective view showing a related configuration of a bearing body and a lower end portion of a crankshaft in the scroll compressor of FIG. 1 in an exploded state and a combined state in (a) and (b).
4 is an explanatory view showing the relationship between the position of a throttle hole in the scroll compressor of FIG. 1, two inflow holes of a bearing body, and two communication holes of a crankshaft.
FIG. 5 is a cross-sectional view showing a scroll compressor according to another embodiment of the present invention.
FIG. 6 is a sectional view showing a scroll compressor according to another embodiment of the present invention.
7 is a diagram illustrating the relationship between the throttle hole and the recess when the orbiting end plate is viewed from the bottom in the scroll compressor of FIG. 6; (a) to (d); Operation | movement explanatory drawing shown by a position.
FIG. 8 is a sectional view showing a scroll compressor according to another embodiment of the present invention.
9 is a perspective view showing a related configuration of a bearing body and a lower end portion of a crankshaft in the scroll compressor of FIG. 8 in an exploded state and a combined state in (a) and (b).
10 is an explanatory diagram showing the relationship between the position of the throttle hole and the communication hole of the crankshaft of the bearing body in the scroll compressor of FIG.
FIG. 11 is a sectional view showing a scroll compressor according to still another embodiment of the present invention.
12 shows the relationship between the entrance hole and the orbiting end plate when the orbiting end plate of the scroll compressor of FIG. 11 is viewed from the bottom; FIGS. Operation | movement explanatory drawing shown by a position.
FIG. 13 is a sectional view showing a scroll compressor according to still another embodiment of the present invention.
FIG. 14 is a cross-sectional view showing a conventional scroll compressor.
15 is an enlarged cross-sectional view showing a throttle portion in the scroll compressor of FIG.
FIG. 16 is a cross-sectional view showing another conventional scroll compressor.
17 is an enlarged cross-sectional view of the scroll compressor of FIG. 16 when the check valve is stopped.
18 is an enlarged cross-sectional view of the scroll compressor of FIG. 16 during operation of the check valve.
[Explanation of symbols]
1 Fixed scroll
2 Orbiting scroll
3 compression space
8 Crankshaft
14 Compression mechanism
25 Liquid reservoir
27 Liquid supply passage
29 Liquid pool space
32 Back pressure chamber
33 Rotating end plate
37 Fixed end plate
38 Seal member
50 fixed blades
51 Swirling blade
52 Bearing body
57, 58, 63 communication hole
53, 54, 62 Inflow hole
59, 61 Restriction hole
60 recess
64 entrance hole
65 Aperture
100 liquid supply path
101 Lubricating oil
102 Lubricating oil supply system
103 Fluid escape route

Claims (6)

The fixed scroll whose blades rise from the end plate and the orbiting scroll are meshed with each other to form a compression space between them. In a scroll compressor including a compression mechanism that performs suction, compression, and discharge of fluid by reducing the size,
A liquid supply passage formed inside a shaft for driving the orbiting scroll and connected to a liquid pool space maintained at a discharge pressure via a lubricating oil supply system in a compression mechanism;
A communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side;
In the liquid reservoir, a bearing body that supports the shaft is provided to open to the liquid reservoir, and an inflow hole that intermittently communicates with the communication hole as the shaft rotates.
A back pressure chamber provided on a back portion of the orbiting scroll in a state of being pressure-blocked with respect to the liquid storage space, and acting on a back pressure that presses the orbiting scroll toward the fixed scroll; and
A throttle hole provided in the orbiting scroll with one end opening communicating with the back pressure chamber, and the other end opening intermittently communicating with the liquid pool space by driving the orbiting scroll;
A scroll compressor characterized by comprising: The fixed scroll whose blades rise from the end plate and the orbiting scroll are meshed with each other to form a compression space between them. In a scroll compressor including a compression mechanism that performs suction, compression, and discharge of fluid by reducing the size,
A liquid supply passage formed inside a shaft for driving the orbiting scroll and connected to a liquid pool space maintained at a discharge pressure via a lubricating oil supply system in a compression mechanism;
A communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side;
In the liquid reservoir, a bearing body that supports the shaft is provided to open to the liquid reservoir, and an inflow hole that intermittently communicates with the communication hole as the shaft rotates.
A back pressure chamber provided on a back portion of the orbiting scroll in a state of being pressure-blocked with respect to the liquid storage space, and acting on a back pressure that presses the orbiting scroll toward the fixed scroll; and
A throttle hole provided in the orbiting scroll in a state where one end opening communicates with the liquid pool space, and the other end opening intermittently communicates with the back pressure chamber by driving the orbiting scroll;
A scroll compressor characterized by comprising:   The scroll compressor according to claim 1 or 2, wherein the shaft and the bearing body are formed with a single or a plurality of sets of communication holes and inflow holes that are individually combined to match the communication state by driving the orbiting scroll. The fixed scroll whose blades rise from the end plate and the orbiting scroll are meshed with each other to form a compression space between them. In a scroll compressor including a compression mechanism that performs suction, compression, and discharge of fluid by reducing the size,
A liquid supply passage formed inside a shaft for driving the orbiting scroll and connected to a liquid pool space maintained at a discharge pressure via a lubricating oil supply system in a compression mechanism;
A communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side;
In the liquid reservoir, a bearing body that supports the shaft is provided to open to the liquid reservoir, and an inflow hole that intermittently communicates with the communication hole as the shaft rotates.
A back pressure chamber provided on a back portion of the orbiting scroll in a state of being pressure-blocked with respect to the liquid storage space, and acting on a back pressure that presses the orbiting scroll toward the fixed scroll; and
A recess formed in the fixed scroll so as to open at all times to the back pressure chamber side;
A throttle hole provided in the orbiting scroll in a state where one end opening communicates with the liquid reservoir space, and the other end opening intermittently communicates with the recess by driving the orbiting scroll;
A scroll compressor characterized by comprising: 5. The scroll compressor according to claim 4 , wherein the shaft and the bearing body are formed with a single or a plurality of sets of communication holes and inflow holes that are individually combined to match the communication state by driving the orbiting scroll. The fixed scroll whose blades rise from the end plate and the orbiting scroll are meshed with each other to form a compression space between them. In a scroll compressor including a compression mechanism that performs suction, compression, and discharge of fluid by reducing the size,
A back pressure chamber provided on a back portion of the orbiting scroll and acting on a back pressure that presses the orbiting scroll toward the fixed scroll; and
Liquid that is formed inside the shaft that drives the orbiting scroll and communicates with the back pressure chamber maintained at a pressure between the discharge pressure and the suction pressure via a throttle part and a lubricating oil supply system in the compression mechanism part. A supply passage;
A communication hole in which the liquid supply passage opens on the outer surface of the shaft on the liquid reservoir side;
An inflow hole provided in a bearing body for bearing the shaft in the liquid reservoir, and intermittently communicating with the communication hole as the shaft rotates;
A pressure adjusting mechanism for releasing excess pressure and maintaining the back pressure at a constant value;
An inlet hole of the pressure adjusting mechanism that intermittently communicates with the back pressure chamber as the shaft rotates;
A scroll compressor characterized by comprising:

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