JP2008115767A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress pressure loss and also suppress a performance drop by securing a delivery channel without enlarging a delivery hole. <P>SOLUTION: A plurality of delivery holes 33 is provided, and are opened and closed by one delivery valve 35. Since the delivery channel is secured without enlarging area of a delivery hole 33, therefore, performance drop is suppressed without dropping reliability due to a crack of the delivery valve 35 or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the fixed scroll and the orbiting scroll are meshed with each other to form a compression chamber between them, and the use of the circular orbital motion of the orbiting scroll moves the compression chamber from the outer periphery to the center while reducing the volume. The present invention relates to a scroll compressor that repeatedly sucks, compresses and discharges fluid.

  Conventionally, this type of scroll compressor is provided with a relief hole (see, for example, Patent Document 1).

FIG. 7 shows a longitudinal sectional view of a compression mechanism portion of a conventional scroll compressor described in Patent Document 1. As shown in FIG. As shown in FIG. 7, a relief hole 2 is formed in the fixed scroll 1.
JP-A 62-197684

  However, in the conventional configuration, the relief valve is opened during operation at a low compression ratio to prevent overcompression, but in recent years, air conditioners and the like have a tendency toward higher performance, and the refrigerant circulation amount has increased. The conventional discharge hole and relief hole 2 have a problem that a discharge flow path cannot be secured and loss increases. Further, when the discharge hole is enlarged to secure the discharge flow path, there is a problem that reliability such as cracking of the discharge valve is lowered.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient and highly reliable scroll compressor by reducing loss and ensuring reliability.

  In order to solve the above-mentioned conventional problems, the scroll compressor of the present invention is provided with a plurality of discharge holes and opens and closes the plurality of discharge holes with one discharge valve.

  Thereby, a discharge flow path can be secured and pressure loss can be suppressed. In addition, the area of one discharge hole can be reduced, stress applied to the discharge valve can be relaxed, and cracking of the discharge valve can be suppressed.

  The scroll compressor of the present invention can secure a discharge flow path, suppress pressure loss, relieve stress applied to the discharge valve, and suppress cracking of the discharge valve, thereby reducing performance and reliability. It can be suppressed.

In a first aspect of the present invention, a compression mechanism and an electric motor are arranged in an airtight container. The compression mechanism includes a fixed scroll having a spiral wrap on an end plate, and a wrap that engages the wrap of the fixed scroll. The orbiting scroll has a plurality of compression chambers, and is fitted to a main bearing member provided at a position sandwiching the orbiting scroll with the fixed scroll and an orbiting bearing portion provided on the end plate of the orbiting scroll. A sealed type that has a crankshaft having a revolving shaft for revolving, and performs compression while reducing the volume toward the center of the compression chamber by revolving motion of the revolving scroll, and discharges compressed gas from the discharge hole In a scroll compressor, a plurality of the discharge holes are provided, and a plurality of discharge holes are opened and closed by one discharge valve, thereby ensuring a discharge flow path. And, it is possible to suppress the pressure loss. In addition, the area of one discharge hole can be reduced, stress applied to the discharge valve can be relaxed, and cracking of the discharge valve can be suppressed.

  In the second invention, in particular, the discharge hole of the first invention is constituted by one main discharge hole and a sub-discharge hole having a smaller area, so that the size of the discharge valve can be suppressed. Therefore, the configuration of the valve can be facilitated.

  In the third invention, in particular, the secondary discharge hole of the second invention communicates with the compression chamber earlier than the main discharge hole, so that the discharge flow path can be secured earlier and the pressure loss can be suppressed. Can be suppressed.

  In the fourth aspect of the invention, in particular, the auxiliary discharge hole of the second aspect communicates with the compression chamber later than the main discharge hole, so that the volume ratio of the suction and discharge of the compression chamber can be secured, and the high compression ratio operation can be ensured. Since undercompression can be suppressed, performance degradation can be suppressed over a wide range of operating conditions.

  In the fifth aspect of the invention, in particular, a counterbore is provided on the compression chamber side of the end plate of the fixed scroll according to any one of the first and second aspects, and the main discharge hole and the sub discharge hole are communicated with the counterbore to thereby wrap the wrap. The discharge flow path can be expanded to the maximum without causing interference, and pressure loss can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention. FIG. 2 shows a state diagram of the fixed scroll and the orbiting scroll in the discharge process according to the first embodiment of the present invention.

  In FIG. 1 and FIG. 2, fixing is performed between the main bearing member 13 of the crankshaft 12 fixed in the sealed container 11 by welding or shrink fitting and the fixed scroll 14 bolted on the main bearing member 13. An Oldham that sandwiches the orbiting scroll 15 meshing with the scroll 14 to form a scroll-type compression mechanism 16 and guides the orbiting scroll 15 to rotate between the orbiting scroll 15 and the main bearing member 13 so as to move in a circular orbit. A rotation prevention mechanism 17 using a ring or the like is provided, and a turning shaft portion 12 a at the upper end of the crankshaft 12 is fitted to a turning bearing 18 provided on the turning scroll 15. A suction chamber 19 for sucking refrigerant gas is provided on the outer peripheral portion of the fixed scroll 14, and a suction pipe 20 communicating with the outside of the sealed container 11 is fitted.

  The lower end of the crankshaft 12 reaches an oil reservoir 21 below the sealed container 11 and is pivotally supported by a secondary bearing member 22 fixed by welding or shrink fitting in the sealed container 11.

  The electric motor 23 is located between the main bearing member 13 and the auxiliary bearing member 22, and is integrally coupled to the stator 23 a fixed to the sealed container 11 by welding or shrink fitting, and the outer periphery in the middle of the crankshaft 12. The rotor 23b and the crankshaft 12 are stably rotated on the outer peripheral portions of the upper and lower end surfaces of the rotor 23b, and the orbiting scroll 15 is stably moved in a circular orbit. Balance weights 25a and 25b fixed by 24 are provided.

The oil supply mechanism is constituted by a pump 26 driven at the lower end of the crankshaft 12, and an oil supply passage 27 penetrating in the axial direction is formed in the crankshaft 12 to supply oil in the oil reservoir 21.

  A back pressure chamber 28 is formed on the outer periphery of the orbiting scroll 15 by the fixed scroll 14 and the main bearing member 13, and the back pressure chamber radially extends from the orbiting bearing portion space 29 formed between the orbiting shaft portion 12 a and the orbiting scroll 15. An oil supply path 30 penetrating up to 28 is provided in the end plate 15 a of the orbiting scroll 15.

  The main bearing member 13 side of the end plate 15a of the orbiting scroll 15 is partitioned by a sealing material 31 having a rectangular cross section disposed on the main bearing member 13, and the inside is a high pressure and the outside is a back pressure chamber 28. The suction chamber 19 communicates with the suction communication passage 32, and a back pressure control mechanism is provided in the suction communication passage 32.

  A plurality of discharge holes 33 for discharging the compressed gas are provided at the center of the fixed scroll 14 and are opened and closed by one discharge valve 35.

  About the scroll compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, as the crankshaft 12 is rotationally driven by the electric motor 23, the orbiting shaft portion 12a at the upper end of the crankshaft 12 is eccentrically driven to move the orbiting scroll 15 in a circular orbit, thereby causing the fixed scroll 14 and the orbiting scroll to move. The suction chamber 34 formed between the suction pipe 20 and the fixed scroll 14 is connected to the outside of the closed container 11 by using the small compression chamber 34 that is formed between the suction pipe 20 and the fixed scroll 14. The refrigerant gas is sucked in from 19 and compressed, and the refrigerant gas having a predetermined pressure or more is discharged into the in-container discharge chamber 36 by opening the discharge valve 35 from the plurality of discharge holes 33 in the center of the fixed scroll 14. Repeat.

  The discharged refrigerant gas passes through the discharge gas passage 37 penetrating the compression mechanism section 16 and reaches the upper portion of the rotor 23b, passes through the rotor gas passage 38 penetrating the rotor 23b, and enters the lower portion of the hermetic container 11. Guided through the stator gas passage 39 disposed on the outer periphery of the stator 23a and the compression mechanism portion notch 40 disposed on the outer periphery of the compression mechanism portion 16 to reach the upper portion of the sealed container 11, and from the discharge pipe 41 to the outside of the sealed container 11 Is discharged.

  The oil in the oil reservoir 21 is supplied to the swivel bearing space 29 through an oil supply passage 27 that passes through the crankshaft 12 in the axial direction by a pump 26. The supplied oil is branched into two systems, and one system lubricates the slewing bearing 18 and the slewing shaft portion 12a, lubricates the main shaft portion 12b and the main bearing 42, and then drops under the main bearing member 13, finally. The oil is collected in the oil reservoir 21.

  The other system is guided to the back pressure chamber 28 through the oil supply path 30 by the differential pressure between the slewing bearing space 29 and the back pressure chamber 28.

  Here, since a plurality of discharge holes 33 are provided and the plurality of discharge holes 33 are opened and closed by one discharge valve 35, a discharge flow path can be secured without increasing the area of one discharge hole 33.

  As described above, in the present embodiment, a plurality of discharge holes 33 are provided, and one discharge valve 35 is used to open and close the plurality of discharge holes 33 so that the area of one discharge hole 33 is not increased. Since the flow path can be secured, it is possible to suppress the performance deterioration without lowering the reliability due to cracking of the discharge valve 35 or the like.

  In addition, as shown in FIG. 3, since the main discharge hole 33a and the sub discharge hole 33b having a smaller area are configured, the size of the discharge valve 35 can be suppressed. Therefore, the interference with the relief valve 43 is prevented. Therefore, the configuration of the valve can be facilitated.

  Further, as shown in FIG. 4, the sub discharge hole 33b communicates with the compression chamber 34 earlier than the main discharge hole 33a, so that the discharge flow path can be secured earlier, so that the performance deterioration can be further suppressed.

  Further, as shown in FIG. 5, the auxiliary discharge hole 33b communicates with the compression chamber 34 later than the main discharge hole 33a, so that the volume ratio of suction and discharge in the compression chamber 34 can be secured, and insufficient compression during operation at a high compression ratio. Therefore, it is possible to suppress performance degradation in a wide range of operating conditions.

  Further, as shown in FIG. 6, a counterbore 44 is provided on the compression chamber 34 side of the end plate of the fixed scroll 14 and the main discharge hole 33a and the sub-discharge hole 33b are communicated with each other by this counterbore 44, so that the maximum is possible without interfering with the lap. Can expand the discharge flow path and suppress pressure loss

  As described above, since the scroll compressor according to the present invention can secure the discharge flow path while suppressing the stress applied to the discharge valve, it is possible to suppress the cracking of the valve and the deterioration of the performance, so that it is highly efficient and reliable. A highly efficient scroll compressor can be provided. Furthermore, it is possible to make the product more comfortable and environmentally friendly as an air conditioner such as a room air conditioner or a heat pump water heater.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention The schematic diagram which shows the operation state of the fixed scroll and turning scroll of the discharge process of the scroll compressor in Embodiment 1 of this invention. The schematic diagram which shows the operation state of the fixed scroll and turning scroll of the discharge process of the scroll compressor in Embodiment 1 of this invention. The schematic diagram which shows the operation state of the fixed scroll and turning scroll of the discharge process of the scroll compressor in Embodiment 1 of this invention. The schematic diagram which shows the operation state of the fixed scroll and turning scroll of the discharge process of the scroll compressor in Embodiment 1 of this invention. The schematic diagram which shows the operation state of the fixed scroll and turning scroll of the discharge process of the scroll compressor in Embodiment 1 of this invention. A longitudinal sectional view of a compression mechanism of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Sealed container 12 Crankshaft 12a Orbiting shaft part 12b Main axis part 13 Main bearing member 14 Fixed scroll 15 Orbiting scroll 15a End plate 16 Compression mechanism 17 Anti-rotation mechanism 18 Orbiting bearing 19 Suction chamber 20 Suction pipe 21 Oil reservoir 22 Sub bearing member 23 Electric motor 23a Stator 23b Rotor 24 Pins 25a, 25b Balance weight 26 Pump 27 Oil supply passage 28 Back pressure chamber 29 Swivel bearing space 30 Oil supply passage 31 Sealing material 32 Suction communication passage 33 Discharge hole 33a Main discharge hole 33b Sub discharge hole 34 Compression Chamber 35 Discharge valve 36 Discharge chamber in container 37 Discharge gas passage 38 Rotor gas passage 39 Stator gas passage 40 Compression mechanism notch 41 Discharge pipe 42 Main bearing 43 Relief valve 44 Counterbore

Claims (5)

A compression mechanism section and an electric motor are arranged in a sealed container, and the compression mechanism section includes a fixed scroll having a spiral wrap on the end plate, and a plurality of orbiting scrolls having a wrap meshing with the fixed scroll wrap. A revolving shaft that forms a compression chamber and is fitted to a main bearing member provided at a position sandwiching the orbiting scroll with the fixed scroll and an orbiting bearing portion provided on the end plate of the orbiting scroll to orbit the orbiting scroll. In a hermetic scroll compressor that performs compression while reducing the volume toward the center of the compression chamber by the orbiting motion of the orbiting scroll, and discharges the compressed gas from the discharge hole. A scroll compressor having a plurality of discharge holes and opening and closing the plurality of discharge holes with one discharge valve. 2. The scroll compressor according to claim 1, wherein the discharge hole includes one main discharge hole and a sub discharge hole having a smaller area. The scroll compressor according to claim 2, wherein the sub discharge hole communicates with the compression chamber earlier than the main discharge hole. The scroll compressor according to claim 2, wherein the sub discharge hole communicates with the compression chamber later than the main discharge hole. 3. The scroll compressor according to claim 1, wherein a counterbore is provided on a compression chamber side of the fixed scroll end plate, and the main discharge hole and the sub-discharge hole are communicated with each other by the counterbore.

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